Evs 3 Environmental Pollution

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UNIT II

POLLUTION CONTROL

POLLUTION

It is a harmful theme for human health.Its a major problem for anyone.

Pollution may be defined as an undesirable change in the physical, chemical orbiological characteristics of our air, water and land that may harmfully affect human life& other species also.

Environmental pollutionIt is a term that refers to all the ways that human activity harms the natural

environment.It can be defined as the unfavorable alteration of our surrounding

Types of Environmental Pollutants

1.Biodegradable pollutants

It decompose rapidly by natural processes2.Non -degradable pollutantsIt do not decompose or decompose slowly in the environment

DUSTS (Pneumoconiosis)Inorganic Dust

Coal Dust - Anthracosis

Silica - Silicosis

Asbestos - Asbestosis

Iron - Siderosis

Organic DustsCane Fiber - Bagassosis

(Bronchi gets affected)

Cotton dust - Byssinosis(In Textile industries)

Tobacco - Tobaccosis, Lung

Cancer

Grain Dust - Farmers Lungs

Common pollutants sources and their effects:

Carbon monoxide (CO)- Colourless and odourless gas- Incomplete combustions of carbon containing fuel

Human sources- Cigarette smoking, incomplete burning of fossil fuels, motor vehicle exhaust


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Health effects:React with hemoglobin in red blood cells and reduces the ability of blood to bring

oxygen to body cell and tissues which causes headaches and anemia. Coma, brain celldamage and death.

Environment effects:

Global temp increaseControl: Using catalytic converter in automobiles.

NITROGEN DIOXIDE (NO2)- Red brown irritating gas- Gives photochemical smog- In the atm, converted in to nitric acid

Human sources- Fossil fuels burning in motor vehicle, power industrial plant

Health effects:

Lung irritation and damageEnvironment effects:Acid deposition- Damage trees, soil and aquatic life in lakes, corrode metal and

eat away stone on building. NO2 can damage fabricControl:

Using catalytic converter in automobiles, Catalytic converters use Pt/ Rh catalyst.in the presence of the catalysts, the oxides of nitrogen are converted to nitrogen andoxygen .

2NOx N2 + x O2

SULPHUR DIOXIDE (SO2)- Colourless and irritating gas- Combustion of sulphur containing fossil fuel (coal and oil)- In the atm, converted in to sulphuric acid

Human sources- Coal burning power plant and industrial process

Health effects:Breathing problem for healthy people

Environment effects:Acid deposition- Damage trees, soil and aquatic life in lakes, reduce the visibility.

Control: The gases evolved during combustion of fossil fuels are passed through calcium

carbonate when SO2 is converted to calcium sulphite. CaCO3 + SO2 CaSO3 + CO2

lime is added to coal and roasted at high temperature so that CaO formedcombines with SO2 to form calcium sulphate.

CaO + SO2 + O2 CaSO4


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Suspended particulate matter- Varity of particles and droplets- Suspended in atm short to long periods

Human sourcesCoal burning power plant and industrial plant, burning diesel and other fuel in

vehicles, agriculture, unpaved roads, construction, etc.,Health effects:Nose and throat irritation, lung damage, bronchitis, asthma, reproductive

problems and cancerEnvironment effects:

Reduce the visibility.

CONTROL:Particulate matter in the atmosphere can be controlled using

a. Gravitational settling chambersb. Centrifugal separators

c. Fabric filtersd. Wet scrubberse. Electrostatic or Cottrell separators

Ozone

- Highly reactive irritating gas with un pleasant odour- Gives photochemical smogHuman sources- Chemical reaction with volatile organic compounds and nitrogen oxides

Environment effects:Moderates climate

Lead pollutantSources:

The exhaust from automobiles which use lead tetraethyl as antiknocking agent-when TEL is used as antiknocking agent, lead is converted to halide and released into theatmosphere.

This leads to increase in the concentration of lead in the atmosphere.

Paint pigments : Litharge and red lead ( oxides of lead ) and lead chromate areused as pigments. These cause lead pollution

Plumbing systems- lead pipes are used for plumbing and these may cause leadpollution

Effects: Lead competes with calcium and enters the blood and bone marrow. The lead interferes in the manufacture of red blood corpuscles and abnormal


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Multiplication of blood cells and thus leads to anaemia and blood cancer inhuman beings.

Lead enters the blood and various organs of the body including the brain and theKidneys leading to dysfunction of the kidney and damage to the brain.

CONTROL MEASURESSource control

Use petroleum products and other fuels that have low sulphur and ash content. Reduce the number of private vehicles on the road by developing an efficient

public-transport system and encouraging people to walk or use cycles. Ensure that houses, schools, restaurants and places where children play are not

located on busy streets. Plant trees along busy streets because they remove particulates and carbon

monoxide, and absorb noise.

Industries and waste disposal sites Should be situated outside the city centrepreferably downwind of the city. Use catalytic converters to help control the emissions of carbon monoxide and

hydrocarbons.

Control measures in industrial centers1. The emission rates should be restricted to permissible levels by each and every

industry.2. Incorporation of air pollution control equipments in the design of the plant layout

must be made. mandatory.3. Continuous monitoring of the atmosphere for the pollutants should be carried out

to know the emission levels

WATER POLLUTION :-

DefinitionWater pollution may be defined as, "the alteration in physical , chemical and biologicalcharacteristics of water which may cause harmful effects on humans and aquatic lifeThe pollutants include sewage, industrial chemicals and effluents, oil and other wastes.Besides, chemicals from the air dissolved in rain tater, and fertilizers, pesticides andherbicides leached from the land also pollute water.

Types, effects and sources (causes) of water pollution

Water pollution is any chemical, biological or physical change in water qualitythat has a harmful effect on living organisms or makes, water unsuitable for desired uses

1. Infectious AgentsEx: Bacteria, viruses, protozoa and parasitic worms.


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Human Sources (causes)Human and animals wastes.

EffectsVariety of disease

2. Oxygen Demanding Wastes (Dissolved oxygen)Organic wastes such as animal manure and plant debris that can be decomposed

by aerobic (oxygen-requiring) bacteria. This degradation consumes dissolved oxygen inwater.

Dissolved oxygen (DO) is the amount of oxygen dissolved in a given quantity ofwater at a particular pressure and temperature. The saturated point of DO varies from 8-15 mg/lit

Human Sources (causes)Sewage, animal feedlots, papermills, and food processing facilities.

EffectsLarge populations of bacteria decomposing these wastes can degrade waterquality by depleting water of dissolved oxygen. This causes fish and other forms ofoxygen-consuming aquatic life to die ..

3. INORGANIC CHEMICALS

Water soluble inorganic chemicalsi) Acids,

(ii) Compound toxic metals such as lead (Pb], arsenic (As) and selenium ( Se)and(iii) Salts such as NaCl in ocean water and fluorides found in some soils.

Human Sources (causes)Surface runoff, industrial effluents and household. cleansers.

Effects(i) Can make fresh water unusable for drinking or irrigation.(ii) Causes skin cancers and neck damage.(iii) Damage the nervous system, liver and kidneys.(iv)Harm fish and other aquatic life(v) Lower crop yields.(vi) Accelerates corrosion of metals exposed to such water.

4. Organic Chemicals

Ex: Oil, gasoline, plastics, pesticides, cleaningsolvents, detergents

Human Sources (causes)Industrial effluents, household .cleansers, surface runoff from farms.

Effects(i) Can threaten human health by causing system damage and some cancers.


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(ii) Harm fish and wild life.

5. Plant NutrientsWater soluble compounds containing nitrate , ammonium and phosphate

ions.

Human Sources (causes)Sewage, manure, and runoff of agricultural and urban fertilizersEffects(i) Can cause excessive growth of algae and other aquatic plants, which die, decay,deplete dissolved oxygen in water and kill the fish.(ii) Drinking water with excessive levels of nitrates lower the oxygen carrying capacity ofthe blood and can kill urban children and infants.

6. SedimentEx: Soil, silt, etc.,

Human Sources (causes)

Land erosion.Effects(i) Disrupt aquatic food webs.(ii) Carry pesticides, bacteria, and other harmful substances.(iii)Settle out and destroy feeding and spawning rounds of fish.(iv) Can reduce photosynthesis and cloud water.(v) Clog and fill lakes, artificial reservoirs, stream channels and harbours

Point and Non-point Sources of Water Pollution(i) Point Sources

Point sources are discharged pollutants at specific locations through pipes, ditchesor sewers into bodies of surface Ex: Includes factories, . sewage treatment plants,abandoned underground mines and oil tankers.(ii) Non-point sources

They are usually large land areas or air sheds that pollute Water by runoff,subsurface flow or deposition from the atmosphere. Location of which cannot be easilyidentified. Ex: Include acid deposition and runoff of chemicals into surface water fromcroplands, livestock feedlots, logged forests, urban street, lawn, golf courses and

parking lots.

Biochemical Oxygen Demand (BOD)BOD is the amount of oxygen required for the biological decomposition of

organic matter present in the water.

Significance of BOD .(i) It is an important indication of the amount of organic - matter present in the river

water.(ii) Since complete oxidation occurs in indefinite period, the reaction period is taken

as 5 days at 20c. for all practical purposes, it is written as BODs


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(iii) The rate of oxidation and demand depends on the amount and type of organic matterpresent in river water.

Chemical Oxygen Demand (COD)

COD is the amount of oxygen required for chemical oxidation of organic matter

using some oxidising agent like K2Cr207 and KMn04

Significance of COD(i) It is carried out to determine the pollutional strength of river water.(ii) It is rapid process and takes only 3 hours.

Waste Water (or) Sewage TreatmentObjectives of waste water treatment

(i) To convert harmful compounds into harmless compounds(ii) To eliminate the offensive smell.(iii) To remove the solid content of the sewage.

(iv) To destroy the disease producing microorganisms.

Treatment processThe sewage (or) waste water treatment process involves the following

steps.

I.Preliminary Treatment

In this treatment, coarse solids and suspended impuritiesare removed by passing the waste water through bar and mesh screens.II. Primarytreatment (or) Settling process

In this treatment, greater proportion of the suspended inorganic and organic solidsare removed from the liquid sewage by settling.

In order to facilitate quick settling coagulants like alum, ferrous sulphate areadded. These produce large gelatinous precipitates, which entrap finely divided organicmatter and settle rapidly.` AI2(S04)3 + 6H20 2AI(OH)3 + 3H2S04.

III. Secondary (or) Biological treatmentIn this treatment, biodegradable organic impurities are removed by aerobic

bacteria. Removes up to 90% of the oxygen demanding wastes, This is done by tricklingfilter or activated sludge process.

(a)Trickling filter processIt is a circular tank and is filled with either coarse or crushed rock. Sewage is

sprayed over this bed by means of slowly rotating arms.When sewage starts percolating downwards, microorganisms present in the

sewage grow on the surface of filtering media using organic material of the sewage asfood.

After completion of aerobic oxidation the treated sewage is taken to the settlingtank and the sludge is removed. This process removes about 80-85% of BOD.


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(b) Activated sludge processActivated sludge is biologically active sewage and it has a large number of aerobicbacterias, which can easily oxidise the organic impurities.

The sewage effluent from primary treatment is mixed with the required amount ofactivated sludge. Then the mixture is aerated in the aeration tank (Fig.).

Under these condition, Air supply organic impurities of the sewage get oxidized rapidlyby the microorganisms.After aeration, the sewage is taken to the sedimentation tank. Sludge settle down

in this tank, called activated sludge, a portion of which is used for seeding fresh batch ofthe sewage. This process removes about 90-95% of BOD

IV. Tertiary treatment

After the secondary treatment, the sewage effluent hasa lower BOD (25 ppm), which can be removed by the tertiary treatment process.

In the tertiary treatment, the effluent is introduced into a flocculation tank, where

lime is added to remove phosphates.From the flocculation tank the effluent is led to ammonia stripping tower, wherepH is maintained to 11 and the NH4 is converted to gaseous NH3.

Then the effluent is allowed to pass through activated charcoal column, whereminute organic wastes are adsorbed by charcoal.

Finally the effluent water is treated with disinfectant (chlorine).

V. Disposal of sludge

This is the last stage in the sewage treatment. Sludge formed from different stepscan be disposed by(I) dumping into low-lying areas.(ii) burning of sludge (incineration),(iii) dumping into the sea,(iv) using it as low grade fertilizers

Specifications for Drinking WaterThe common specifications recommended by the U.S Public Health for Drinking

Water are given below.

(i) Water should be clear and odourless.(ii) It should be cool.

(iii) It should be pleasant to taste.(iv) Turbidity of the water should not exceed 10 ppm.(v) pH of the water should be in the range of 6-8.

(vi) Chloride and sulphate contents should be less than 250 ppm.(vii) Total hardness of the water should be less than 500 ppm.

(viii) Total dissolved solids should be less than 500 ppm.(ix) Fluoride content of the water should be less than 1.5 ppm.(x) The water must be free from disease-producing bacteria.


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(xi) Water should be free from objectionable dissolved gases like H2S.(xii) Water should be free from objectionable minerals such as lead, chromium,

manganese and arsenic salts.

Water Quality Standards

Water used for drinking should have certain quality.

AIR POLLUTION

Air pollution, addition of harmful substances to the atmosphere resulting indamage to the environment, human health and quality of life. Or The presence of one ormore contaminants like dust, smoke, mist and odour in the atmosphere which areinjurious to human beings, plants and animals.

Composition of atmosphere air:Nitrogen-78%,Oxygen- 21%,

Argon-


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TYPES, EFFECTS AND SOURCES (CAUSES) OF SOIL POLLUTIONSoil pollution mainly results from the following sources

Industrial wastes.

Urban wastes.

Agricultural practices.

Radioactive pollutants. Biological agents

INDUSTRIAL WASTES:

Disposal of industrial wastes is the major problem for soil pollution.SOURCES

The industrial pollutants are mainly discharged from thevarious origins such as pulp and paper mills, chemicalindustries, oil refineries, sugar factories tanneries, textiles,steel, distilleries, fertilizers, pesticides, coal and mineral miningindustries, drugs, glass, cement, petroleum and engineering industries etc.,

EFFECT These pollutants affect and alter the chemical and biological properties ofsoil.

As a result, hazardous chemicals can enter into humanfood chain from the soil or water and disturb the biochemicalprocess and finally lead to serious effects on living organisms

URBAN WASTES:

Urban wastes comprises both commercial and domestic wastes consisting of driedsludge of sewage. All the urban solid wastes are commonly referred to as refuse ..

Constituents of Urban Refuse This refuse contains garbage and rubbish materials like plastics, glasses,

metallic cans, fibres, paper, rubbers, street sweepings, fuel residues, leaves,containers, abandoned vehicles and other discarded manufactured products.

Urban wastes though disposed off separately from the Indus wastes, can still bedangerous. This is so because they cannot be easily degraded

AGRICULTURAL PRACTICES:Modern agricultural practices pollute the soil to a large extent. Today with the

advancing agro-technology, huge quantities of fertilizers, pesticides, herbicides,weedicides are added to increase the crop yield

Apart from these farm wastes, manure, slurry, debris, soil erosion containingmostly inorganic chemicals are reported to cause soil pollution

RADIOACTIVE POLLUTANTS:Radioactive substances resulting from explosions of nuclear dust and

radioactive wastes penetrate the soil and accumulate there by creating land pollution.

BIOLOGICAL AGENTS:Soil gets large quantities of human, animal and bird's excreta which

constitute the major source of land pollution by biological agents


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Ex:Heavy application of manures and digested sludge's could cause serious

damage to plants within a few - year Because the sludge's are containing more liveviruses and viable intestinal worms.

In addition to these excreta, faulty sanitation, municipal garbage, waste

water and wrong methods of agricultural practices also induce heavy soil pollution.

Major physico-chemical characteristics of untreated wastes of Organic chemical

industries in Soil

Major physico-chemical characteristics of untreated wastes of Inorganic chemical

industries in Soil

CONTROL MEASURES OF SOIL POLLUTIONThe pressure on intensification of farm activities increases for two reasons.

1. Population growth.

2. Decrease of the available farm land due to urbanization.1).Control of Soil erosion:Soil erosion can be controlled by a variety of forestry and farm practices

(a) Trees may be planted on barren slopes.(b) Contour cultivation and strip cropping may be practiced instead of

shifting cultivation.(c) Terracing and building diversion channels may be undertaken.

Reducing deforestation and substituting chemical manures by animal wasteswould also help to arrest soil erosion

2).Proper Dumping of unwanted materials:Excess of waste products by man and animal cause disposal problem

3).Production of Natural Fertilizers:Excess use of chemical fertilizers and insecticides should be avoided.

Biopesticides should be used4). Proper Hygienic Condition:

People should be trained regarding the sanitary habits5). Public Awareness:

Informal and formal programs should be imparted- to educate the people onhealth hazards

6). Recycling and Reuse Of Wastes:7). Ban on Toxic Chemicals:

MARINE POLLUTIONDefinition

Marine pollution is defined as, "the discharge of waste substances into the searesulting in harm to living resources, hazards to human health, hindrance to fisheryand impairment of quality for use of sea water.


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Source (causes) of marine pollutionAbout half of the world population live nearer to coastal lines and gain many

benefits from the coastal zones and oceans. The coastal zones contains rich heritage,coral reefs, wetlands and sea grass beds.

Benefits of coral reefs:The coral reefs which are the most productive eco-systems offer many benefits to

people. Reefs support more than one millions species. They provide feeding, breeding and nursery areas to fish and shell fish. They offer medicines. They act as buffer to ocean waves and protect

coastal lines from storms and so on.

Effects of Marine pollution The presence of heavy metals and-organic pollutants

cause more damage in birds as thinning of egg shell and tissue damage of egg. Oil pollution cause damage to marine fauna and flora including algae, fish, birds,

invertebrates. About 50,000 to 2,50,000 birds are killed every year by oil. Oil spilling in sea water causes abnormally low body temperature in birds

resulting in hypothermia. Nearly150 rare species of bald eagles also became victims when they ingested oil duringExxon Valdez accident.

Oil films are able to retard significantly the rate of oxygen uptake by water.

Cost of Marine Pollution 3.25 million metric tons of oil wasted vs. 3.4 million tons used by Jamaica annually 100,000 mammal and 2 million bird deaths annually Reduction of GDP by decreasing fishery resource (11.9k tonnes 7.7k landed 1960-97)and decreased tourism earnings Loss of bio-diversity and potential life saving medicines (for AIDS &Cancer)

Solutions to PollutionTwo main methods Correction costly and time intensive Prevention requires attitude changes

Coastal Scientists believe that prevention is better than cure since theeffects of marine pollution maybe irreversible and we may therefore be creatingeverlasting damage to the marine ecosystem.

An ounce of prevention is worth a pound of cure


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Control Measures of Marine- Pollution Plants for conserving marine biodiversity must be taken into account of human

needs. People should be educated about marine ecosystems and the benefits offered by

them.

Local communities must be involved in protecting and managing their coastalresources. Social and economic incentives must be offered for

conserving and sustainable use of marine resources. The fact that all the oceans in the world are connected must be reflected in the

policies. Governments must manage their own waters while

extending cooperation to the neighboring states)

NOISE POLLUTIONDefinitionNoise pollution is defined as, "the unwanted, unpleasant or disagreeable sound

that causes discomfort for all living beings."Noise level

Normal conversation sound ranges from 35 dB to 60 dB. Impairment of hearing takes place due to exposure to noise of 80 dB or more. Noise above 140 dB becomes painful.

What is noise?In simple terms, noise is unwanted sound.Sound is a form of energy which is emitted by a vibrating body and on reaching

the ear causes the sensation of hearing through nerves.A noise problem generally consists of three inter-related elements-

the source, the receiver and the transmission path.

Noise may be continuous or intermittent.Noise may be of high frequency or of low frequency which is undesired for a

normal hearing.

The differentiation between sound and noise also depends upon The habit and interest of the person/species The ambient conditions Impact of the sound


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AnnoyancePhysiological effectsLoss of hearingHuman performanceNervous system

SleeplessnessDamage to material

Effects of Noise Pollution Noise Pollution affects human health, comfort and efficiency. It causes contraction of blood vessels, makes the skin pale, leads to excessive

secretion of adrenal in hormone into blood stream which is responsible for highblood pressure.

Blaring sounds have known to cause mental distress, heart attacks neurologicalproblems, birth defects and abortion.

Control of Noise PollutionThe techniques employed for noise control can be broadly classified as

Control at source Control in the transmission path Using protective equipment.

THERMAL POLLUTION:- Thermal Pollution, harmful increase in water temperature in streams, rivers, lakes,

coastal ocean waters. Thermal pollution is caused by either dumping hot water from factories and

power plants or removing trees that permitting sunlight to raise the temperature ofthese waters.

Thermal pollution is widespread, affecting many lakes and vast numbers ofstreams and rivers.

The major sources of thermal pollution are electric power plants and industrialfactories.

Cold waters are better habitat for plants and animals than warm ones because coldwaters contain more dissolved oxygen

Source : Nuclear power plants Coal fired power plants Industrial effluents Domestic sewage Hydro-electric power

Nuclear power plants- Drainage from hospitals, Research institutes, Nuclear experiments and explosion


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- Discharged a lot of unutilized heat and traces of toxic radio nuclides- Emission of Nuclear reactors and processing installation to temp in water

bodies

Introduction of thermal pollution into streams by human activities

Industries and power plants use water to cool machinery and then discharge thewarmed water into a stream. Stream (water) temperature rises when trees and tall vegetation providing shades

are cut down. Soil erosion caused by construction. Removal of stream side vegetation. Poor farming practices.

Effects of Thermal Pollution

1. Reduction in dissolved oxygen:Concentration of dissolved oxygen (DO) decreases with increase in temperature

of water.2. Increase in Toxicity:The rising temperature increases the toxicity of the poison present in water.

3. Interference with biological activities:Temperature is considered to be of vital significance to physiology metabolism

and biochemical process in controlling respiratory rates, digestion

4. Interference with reproduction:In fishes, several activities like nest building, spanning, hatching, migration and

reproduction etc., depend on optimum temperature.

5. Direct mortality:Unutilized heat in water is responsible for direct, mortality of aquatic organisms..

6. Food storage for fish:Change in temperature alters the seasonal variation in the type and abundance of

lower organisms.

Control measures (or) management of thermal pollution

1. Cooling towers: The use of water from water systems for cooling purposes with subsequent return

to the water way after passage through the condenser, is termed as coolingprocess.Cooling tower are of two types.

(a) Wet Cooling tower: Hot water, coming out from the Condenser (reactor) is allowed to spray over

baffles. Cool air, With high velocity, is passed from' sides, which takes away theheat and cools the water.


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(b) Dry Cooling tower:Here the hot water is allowed to flow in a long spiral pipes. Cool air, with the help

of fan, is passed over these hot pipes, which cools down the hot water. This cool watercan be recycled.

(c) Other methods:-

Cooling ponds:Spray ponds:Artificial lakes:

Waste:Any material which is not needed by the owner, producer or processor.

Solid waste- vegetable waste, kitchen waste, household waste etc.

E-waste- discarded electronic devices like computer, TV, music systems etc.

Liquid waste- water used for different industries eg tanneries, distilleries, thermalpower plants

Plastic waste- plastic bags, bottles, buckets etc.

Metal waste- unused metal sheet, metal scraps etc.

Nuclear waste- unused materials from nuclear power plants

Solid Waste in India 7.2 million tones of hazardous waste One Sq km of additional landfill area every-year Rs.1600 core for treatment & disposal of these wastes In addition to this industries discharge about 150 million tones of high volume

low hazard waste every year, which is mostly dumped on open low lying landareas.

Types and sources of solid wastes:-

Depending upon the nature, solid wastes can be broadly classified into three types Urban (or) Municipal wastes.

Industrial wastes.

Hazardous wastesSources of. Urban (Municipal) Wastes

Urban or municipal wastes include the following wastes


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DOMESTIC WASTES:It contains a variety of materials thrown out from the homesEx: Food waste, cloth, waste paper, glass bottles, polythene bags, waste metals,

etc.,

Commercial wastes:It includes the wastes coming out from the shops, markets, hotels, offices,institutions, etc.,Ex: Waste paper, packing material, cans, bottle, polythen'e bags, etc.,

Construction wastes:It includes the wastes of construction materials.Ex: wood, concrete, debris etc.

Biomedical wastes:It includes mostly the waste organic materials .

Ex: Anatomical wastes, infectious wastes, etc.,

Type and characteristics of Urban (municipal) Wastes :-

(i) Bio-degradable wastes:The urban solid waste materials, that can be degraded by micro organisms are

called biodegradable wastes.Ex: Food, vegetables, tea leaves, egg shells, dry leaves, etc.,

(ij) Non.- Biodegradable wastes:The urban solid Waste materials that cannot be degraded by micro organisms are

called non-biodegradable wastes.Ex: Polythene bags, scrap metals, glass bottles , etc.,

Source and Characteristics of Industrial WastesThe main sources of industrial wastes are chemical industries, metal and mineral

processing industries.

Example:Nuclear power plants:

It generates radioactive wastes.Thermal power plants:

It produces. fly ash in large quantities.Chemical industries:

It produces large quantities of hazardous and toxic materials .Other industries:

Other industries produce, packing materials, rubbish, organic waste, acids, alkalis,scrap metals, rubber, plastic, paper, glass, wood, oils, paints, dyes, etc.,


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Hazardous WastesHazardous wastes are the wastes, that pose a substantial danger immediately or

over a period of time to human, plant or animal life.

Sources of Hazardous wastes

Chemical manufacturing companies, petroleum refineries, paper mills, smelters,radioactive substances, biological wastes and other industries.

Types and characteristics of hazardous wastes

TOXIC WASTES:These are poisonous even in very small or traces amounts.

(a) Acute toxicity:These wastes have immediate effect on humans or animals causing death.

(b) Chronic toxicity:These wastes have long-term effect slowly causing irreparable harm to the

exposed persons. It is much more difficult to determine.ii) Reactive wastes:

These wastes react vigorously with air, heat and generate toxic gasesEx: Gun powder, nitroglycerine, etc.,

(iii) Corrosive wastes:These wastes destroy materials and living tissues by chemical reaction.

Ex:Acids and basesIv). Radioactive wastes:

These are from nuclear power plants and persist in the environment for thousandsof years

(v) Infectious wastes:It causes infection to others.

EX: Used bandages, human tissue from surgery, hypodermic needles, etc.

(vi) Heavy metals:Lead, mercury and arsenic are hazardous substances.

Effect of Solid Wastes (or) Effect of Improper Solid Waste Management

Due to improper disposal of municipal solid wastes on the road side and theirimmediate surroundings, biodegradable materials undergo decomposition. Thisproduces foul smell and breeds various types of insects, which spoil the landvalue.

Toxic substances may percolate into the ground and contaminate the ground water


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Industrial solid wastes are the sources of toxic metals and hazardous wastes,which affect the soil characteristics and productivity of soils when they aredumped on the soil.

Burning of some of the industrial wastes (or) domestic wastes (like cans,pesticides, plastics, radioactive materials, batteries) produce furans, dioxins and

polychlorinated biphenyls, which are harmful to human beings.Process of Solid Waste Management (or) Process of preventing solid waste generationin urban areas

Solid waste management includes, the waste generation, mode ofcollection, transportation, segregation of wastes and disposal techniques.

Collection of waste from various sources

To transfer the collected wastes to the destination point

To store the collected wastes meanwhile time of the disposal

Home separator for recycling

(a) Landfill (b) Incineration (C) Composting

Steps Involved in Solid Waste Management

Two important steps of solid waste management is Reduce, reuse .and recycle,before destruction and safe storage of wastes.

Reduce, Reuse and Recycle (3R) (a) Reduce the usage of raw materials

If the usage of raw materials is reduced, the generation of waste also gets reduced. (b) Reuse of waste materials

(a) The refillable containers, which are discarded after use, can be reused.(b) Rubber rings can be made from the discarded cycle tubes, which

reduce the waste generation during manufacturing of rubber bands.

(c) Recycling of materialsRecycling is the reprocessing of the discarded materials into new useful products.(a) Old aluminum cans and glass bottles are melted and recast into new cans and

bottles. (b) Preparation of cellulose insulation from paper.

(d) Preparation of automobiles and construction

materials from steel cans.

The above process saves money, energy, raw materials, and reduces pollution.


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Discarding wastes For discarding solid wastes the following methods can be adopted.

(a) Landfill (b) Incineration (c) Composting

Objectives (or) significance for prevention of hazardous wastes management Avoid (or) reduce generation of hazardous wastes. Dispose the wastes as close as possible to the place where they are generated. Manage the wastes in environmentally sound and effective way. Optimize environmentally sound recover of the hazardous wastes. Prevent illegal international traffic in- hazardous wastes. Promoting capacities in and strengthening institutional hazardous waste

management. Promoting and strengthening international co-operations in the management. Promoting the prevention and minimization of using hazardous wastes. Reduce to a minimum (or) eliminate the trans boundary movements.

ROLE OF AN INDIVIDUAL IN PREVENTION OF POLLUTIONEnvironmental pollution cannot be prevented and removed.

The proper implementation and especially the individual participation are theimportant aspects which should be given due importance and stress.

The individual participation is useful in law making processes and restrainingthe pollution activities and thereby the public participation plays a major role in the

effective environmental management

Role and responsibility of Individual participationin environmental protection Plant more trees Help more in pollution prevention than pollution control. Use water, energy and other resources efficiently. Purchase recyclable, recycled and environmentally safe products. Use CFC free refrigerators. Use natural gas than coal. Reduce deforestation. Increase use of renewable resources. Remove. NO

xfrom motorvehicular exhaust.

Use office machines in well ventilated areas. Use less polluting substitutes for harmful cleaning agents, paints and other

products. Use ecofriendly products Slow population growth. Reduce garbage by recycling and reuse.


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Role of women in environmental protection

Women play an important role in environmental protection, considering their status insocial production, consumption and their influence to future generations at home. Variousroles of women are

In rural areas, women plant trees and grass, grow vegetables with the drip-irrigation method in order to save water. In urban areas, they go shopping using cloth bags to reduce white pollution. Women refuse to use disposal products to save energy and resources. Women choose green products instead of poor quality that harm the environment. Women reduce the amount of trash they dispose off so as to recycle natural

resources. Women buy non-phosphate detergents to reduce the incidence of water pollution. They value paper and thus protect trees. Women bring the concept of environment protection into families and thus plant a

green seed in the heart of children

Control measures (methods) of pollution

1. The-administration of water pollution control should be in the hands ofState or Central Government.

2. Scientific techniques are necessary to be adopted for the environmentalcontrol of catchment areas of rivers, ponds or streams.

3. The industrial plants should be based on recycling operations, because itwill not only stop the discharge of industrial wastes into natural watersources but by products can be extracted from the wastes. ,

4. Plants, trees and forests control pollution and they acts as natural airconditioners. It is not advisable to discharge any type of waste, eithertreated, partially treated or untreated, into streams, rivers, lakes, ponds andreservoirs.

5. The industries are expected to develop close-loop water supply schemesand domestic sewage may be used for irrigation.

6. Highly qualified and experienced persons should be consulted from timeto time for effective control of water pollution.

7. Public awareness regarding adverse effects of water pollution is a must. Sothere should be propaganda for water pollution control on radios, TVs etc.

8. Suitable laws, standards and practices should be framed to regulate thedischarge of undesirable flow of water in water bodies and suchregulations should be modified from time to time in order to accommodatethe changing requirements' and technological advancements.

9. Forests in and around big cities and industrial establishments are capableof reducing the sulphur dioxide and nitric oxide pollutants to a greaterextent from the atmosphere. Hence the national goal should be"Conservation of Forests" and campaign should be "Plant more trees".The


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global destruction of forests should be discouraged or atleast minimizedand afforestation should be encouraged because no one on this earth willescape from the adverse effects of a balding earth

10.Basic and applied research in public health engineering should beencouraged:

11.

The possible reuse or recycle of treated sewage effluents and industrialwastes should be emphasized and encouraged.

Disaster?

Disaster is defined as a crisis situation causing wide spread damage which far exceedsour ability to recover.Is a natural or human-caused event which causes intensive negative impacts on people,goods, services and/or the environment, exceeding the affected communitys capability torespond

Disaster Management:

Is more than just response and relief (i.e., it assumes a more proactive approach)

Is a systematic process (i.e., is based on the key management principles ofplanning,organizing, and leading which includes coordinating and controlling) Aims to reduce thenegative impact or consequences of adverse events.(i.e., disasters cannot always be prevented, but the adverse effects can be minimized)

Types of Disaster:-

Disasters are mainly of 2 types,1. Natural disasters. Example earthquakes, floods, landslides, etc.

2. Man made disasters. Example war, bomb blasts, chemical leaks, etc.

The phases of all disasters be it natural or manmade, are the same. The disasters oftendiffer in quantity of damage caused or in quality of the type of medical consequences. Forexample earthquakes cause a lot of physical injury and fractures, floods cause drowningdeaths and infections, chemical leaks cause toxic manifestations, etc.


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A graphic Representation of the Four Phases in Disaster management

1.Mitigation:-

Mitigation efforts attempt to prevent hazards from developing into disastersaltogether, or to reduce the effects of disasters when they occur.The mitigation phase differs from the other phases because it focuses on long-termmeasures for reducing or eliminating risk.


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Structural measures use technological solutions, like flood levees.

Non-structural measures include legislation, land-use planning (e.g. the

designation of nonessential land like parks to be used as flood zones), and insurance.

Mitigation is the most cost-efficient method for reducing the impact of hazards.However, mitigation is not always suitable and structural mitigation in particular mayhave adverse effects on the ecosystem.

3. Preparedness:- This phase involves the development of awareness among thepopulation on the general aspects of disaster and on how to behave in the face of afuture disaster. This includes education on warning signs of disasters, methods ofsafe and successful evacuation and first aid measures.

Common preparedness measures include the communication plans with easily understandable terminology and chain ofcommand

development and practice of multi-agency coordination and incident command

proper maintenance and training of emergency servicesdevelopment and exercise of emergency population warning methods combined withemergency shelters and evacuation plans

stockpiling, inventory, and maintenance of supplies and equipment.

3. Response:-The response phase includes the mobilization of the necessary emergency services andfirst responders in the disaster area. This is likely to include a first wave of coreemergency services, such as firefighters, police and ambulance crews. They may besupported by a number of secondary emergency services, such as specialist rescue teams.In addition volunteers and non-governmental organizations (NGOs) such as the local RedCross branch may provide immediate practical assistance, from first aid provision toproviding food and counseling.

A well rehearsed emergency plan developed as part of the preparedness phaseenables efficient coordination of rescue efforts.

Emergency plan rehearsal is essential to achieve optimal output with limitedresources.

Medical assets will be used in accordance with the appropriate triage of theaffected victims. Where required, search and rescue efforts commence at an early stage.


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Depending on injuries sustained by the victim, outside temperature, and victim access toair and water, the vast majority of those affected by a disaster will die within 72 hoursafter impact. Individuals are often compelled to volunteer directly after a disaster.Volunteers can be both a help and a hindrance to emergency management and other reliefagencies.

4.Recovery:-The aim of the recovery phase is to restore the affected area to its previous state.

It differs from the response phase in its focus; recovery efforts are concerned with issuesand decisions that must be made after immediate needs are addressed. Recovery effortsare primarily concerned with actions that involve rebuilding destroyed property,reemployment, and the repair of other essential infrastructure. An important aspect ofeffective recovery efforts is taking advantage of a window of opportunity for theimplementation of mitigate measures that might otherwise be unpopular. Citizens of theaffected area are more likely to accept more mitigate changes when a recent disaster is infresh memory.

Guidelines for flood Disaster:- (NDMA)

Before a Flood To prepare for a flood, you should:

Avoid building in a floodprone area unless you elevate and reinforce your home.

Elevate the furnace, water heater, and electric panel if susceptible to flooding.

Install "check valves" in sewer traps to prevent floodwater from backing up into thedrains of your home.

Contact community officials to find out if they are planning to construct barriers

(levees, beams, floodwalls) to stop floodwater from entering the homes in your area. Seal the walls in your basement with waterproofing compounds to avoid seepage.

During a Flood If a flood is likely in your area, you should:

Listen to the radio or television for information.

Be aware that flash flooding can occur. If there is any possibility of a flash flood, moveimmediately to higher ground. Do not wait for instructions to move.

Be aware of streams, drainage channels, canyons, and other areas known to floodsuddenly. Flash floods can occur in these areas with or without such typical warnings asrain clouds or heavy rain.

If you must prepare to evacuate, you should do the following:

Secure your home. If you have time, bring in outdoor furniture. Move essential itemsto an upper floor.


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Turn off utilities at the main switches or valves if instructed to do so. Disconnectelectrical appliances. Do not touch electrical equipment if you are wet or standing inwater.

If you have to leave your home, remember these evacuation tips:

Do not walk through moving water. Six inches of moving water can make you fall. Ifyou have to walk in water, walk where the water is not moving. Use a stick to check thefirmness of the ground in front of you.

Do not drive into flooded areas. If floodwaters rise around your car, abandon the carand move to higher ground if you can do so safely. You and the vehicle can be quicklyswept away.

Driving Flood Facts The following are important points to remember when driving inflood conditions: Six inches of water will reach the bottom of most passenger cars causing loss ofcontrol and possible stalling.

A foot of water will float many vehicles. Two feet of rushing water can carry away most vehicles including sport utility vehicles(SUVs) and pick-ups.

After a Flood The following are guidelines for the period following a flood:

Listen for news reports to learn whether the communitys water supply is safe to drink.

Avoid floodwaters; water may be contaminated by oil, gasoline, or raw sewage. Watermay also be electrically charged from underground or downed power lines.

Avoid moving water.

Be aware of areas where floodwaters have receded. Roads may have weakened andcould collapse under the weight of a vehicle.

Stay away from downed power lines, and report them to the power company.

Return home only when authorities indicate it is safe.

Stay out of any building if it is surrounded by floodwaters.

Use extreme caution when entering buildings; there may be hidden damage,particularly in foundations.

Service damaged septic tanks, cesspools, pits, and leaching systems as soon aspossible. Damaged sewage systems are serious health hazards.

Clean and disinfect everything that got wet. Mud left from floodwater can containsewage and chemicals.


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Flood: Know Your Terms

Familiarize yourself with these terms to help identify a flood hazard: Flood Watch: Flooding is possible. Tune in to Local Radio for Weather Services,commercial radio, or television for information.

Flash Flood Watch: Flash flooding is possible. Be prepared to move to higherground; listen to Local Radio for Weather Services, commercial radio, or television forinformation.

Flood Warning: Flooding is occurring or will occur soon; if advised to evacuate, doso immediately.

Flash Flood Warning: A flash flood is occurring; seek higher ground on footimmediately.

Guidelines for cyclone :- (NDMA)

The actions that need to be taken in the event of a cyclone threat can broadly be dividedinto four classes, viz., (i) immediately before the cyclone season; (ii) when cyclone alertsand warnings are on; (iii) when evacuations are advised; and (iv) when the cyclone hascrossed the coast.

Before the Cyclone season:

Check the house; secure loose tiles, carry out repair works for doors and windows

Remove dead woods or dying trees close to the house; anchor removable objects likelumber piles, loose tin sheds, loose bricks, garbage cans, sign-boards etc. which can fly instrong winds

Keep some wooden boards ready so that glass windows can be boarded if needed

Keep a hurricane lantern filled with kerosene, battery operated torches and enough drycells

Demolish condemned buildings

Keep some extra batteries for transistors

Keep some dry non-perishable food always ready for emergency use

When the Cyclone starts

Listen to the radio (All India Radio stations give weather warnings).

Keep monitoring the warnings. This will help you to prepare for a cyclone emergency.

Pass on the information to others.

Ignore rumours and do not spread them; this will help to avoid panic situations.


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Believe in the official information

When a cyclone alert is on for your area continue normal working but stay alert to theradio warnings.

Remember that a cyclone alert means that the danger is within 24 hours. Stay alert.

When your area is under cyclone warning get away from low-lying beaches or otherlow-lying areas close to the coast

Leave early before your way to high ground or shelter gets flooded

Do not delay and run the risk of being marooned

If your house is securely built on high ground take shelter in the safer part of the

house. However, if asked to evacuate do not hesitate to leave the place.

Board up glass windows or put storm shutters in place.

Provide strong suitable support for outside doors.

If you do not have wooden boards handy, paste paper strips on glasses to preventsplinters. However, this may not avoid breaking windows.

Get extra food, which can be eaten without cooking. Store extra drinking water in

suitably covered vessels.

If you are to evacuate the house move your valuable articles to upper floors tominimize flood damage.

Have hurricane lantern, torches orother emergency lights in working conditions andkeep them handy.

Small and loose things, which can fly in strong winds, should be stored safely in a

room. Be sure that a window and door can be opened only on the side opposite to the onefacing the wind.

Make provision for children and adults requiring special diets.

If the centre of the cyclone is passing directly over your house there will be a lull in the

wind and rain lasting for half and hour or so. During this time do not go out; becauseimmediately after that very strong winds will blow from the opposite direction.

Switch off electrical mains in your house.

Remain calm.


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When Evacuation is instructed Pack essentials for yourself and your family to last you a few days, including

medicines, special foods for babies and children or elders.

Head for the proper shelter or evacuation points indicated for your area.

Do not worry about your property At the shelter follow instructions of the person in charge.

Remain in the shelter until you have been informed to leave

Post-cyclone measures

You should remain in the shelter until informed that you can return to your home. You must get inoculated against diseases immediately.

Strictly avoid any loose and dangling wires from the lamp posts.

If you are to drive, drive carefully.

Clear debris from your premises immediately.

Report the correct loss to appropriate authorities.

Guidelines for earthquake:- (NDMA)

What to Do Before an Earthquake

Repair deep plaster cracks in ceilings and foundations. Get expert advice if there aresigns of structural defects. Anchor overhead lighting fixtures to the ceiling.

Follow BIS codes relevant to your area for building standards Fasten shelves securely to walls. Place large or heavy objects on lower shelves. Store breakable items such as bottled foods, glass, and china in low, closed cabinetswith latches. Hang heavy items such as pictures and mirrors away from beds, settees, and anywherepeople sit. Brace overhead light and fan fixtures. Repair defective electrical wiring and leaky gas connections. These are potential fire

risks. Secure a water heater, LPG cylinder etc., by strapping it to the wall studs and bolting it

to the floor. Store weed killers, pesticides, and flammable products securely in closed cabinets withlatches and on bottom shelves.

Identify safe places indoors and outdoors.1. Under strong dining table, bed2. Against an inside wall3. Away from where glass could shatter around windows, mirrors, pictures, or where


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heavy bookcases or other heavy furniture could fall over4. In the open, away from buildings, trees, telephone and electrical lines, flyovers, bridges

Educate yourself and family members Know emergency telephone numbers (doctor, hospital, police, etc)

Have a disaster emergency kit ready1. Battery operated torch2. Extra batteries3. Battery operated radio4. First aid kit and manual5. Emergency food (dry items) and water (packed and sealed)6. Candles and matches in a waterproof container7. Knife8. Chlorine tablets or powdered water purifiers9. Can opener.10. Essential medicines

11. Cash and credit cards12. Thick ropes and cords13. Sturdy shoes

Develop an emergency communication plan1. In case family members are separated from one another during an earthquake (a realpossibility during the day when adults are at work and children are at school), develop aplan for reuniting after the disaster.2. Ask an out-of-state relative or friend to serve as the 'family contact' After a disaster, it'soften easier to call long distance. Make sure everyone in the family knows the name,address, and phone number of the contact person. Help your community get ready1. Publish a special section in your local newspaper with emergency information onearthquakes. Localize the information by printing the phone numbers of local emergencyservices offices and hospitals.2. Conduct a week-long series on locating hazards in the home.3. Work with local emergency services and officials to prepare special reports for peoplewith mobility impairments on what to do during an earthquake.4. Provide tips on conducting earthquake drills in the home.5. Interview representatives of the gas, electric, and water companies about shutting offutilities. Work together in your community to apply your knowledge to building codes,retrofitting programmes, hazard hunts, and neighborhood and family emergency plans.

What to Do during an Earthquake

Stay as safe as possible during an earthquake. Be aware that some earthquakes are actuallyforeshocks and a larger earthquake might occur. Minimize your movements to a few stepsto a nearby safe place and stay indoors until the shaking has stopped and you are sureexiting is safe.


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If indoors

DROP to the ground; take COVER by getting under a sturdy table or other piece offurniture; andHOLD ON until the shaking stops. If there isnt a table or desk near you,cover your face and head with your arms and crouch in an inside corner of the building.

Protect yourself by staying under the lintel of an inner door, in the corner of a room,under a table or even under a bed. Stay away from glass, windows, outside doors and walls, and anything that could fall,

such as lighting fixtures or furniture. Stay in bed if you are there when the earthquake strikes. Hold on and protect your head

with a pillow, unless you are under a heavy light fixture that could fall. In that case, moveto the nearest safe place. Use a doorway for shelter only if it is in close proximity to you and if you know it is astrongly supported, loadbearing doorway. Stay inside until the shaking stops and it is safe to go outside. Research has shown thatmost injuries occur when people inside buildings attempt to move to a different location

inside the building or try to leave. Be aware that the electricity may go out or the sprinkler systems or fire alarms may turnon. DO NOT use the elevators.

If outdoors

Stay there.

Move away from buildings, trees, streetlights, and utility wires. Once in the open, stay there until the shaking stops. The greatest danger exists directly

outside buildings, at exits, and alongside exterior walls. Most earthquake-related casualtiesresult from collapsing walls, flying glass, and falling objects.

If in a moving vehicle

Stop as quickly as safety permits and stay in the vehicle. Avoid stopping near or under

buildings, trees, overpasses, and utility wires. Proceed cautiously once the earthquake has stopped. Avoid roads, bridges, or ramps thatmight have been damaged by the earthquake.

If trapped under debris

Do not light a match. Do not move about or kick up dust.

Cover your mouth with a handkerchief or clothing. Tap on a pipe or wall so rescuers can locate you. Use a whistle if one is available. Shoutonly as a last resort. Shouting can cause you to inhale dangerous amounts of dust.


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After an earthquake

Keep calm, switch on the radio/TV and obey any instructions you hear on it. Keep away from beaches and low banks of rivers. Huge waves may sweep in. Expect aftershocks. Be prepared.

Turn off the water, gas and electricity. Do not smoke and do not light matches or use a cigarette lighter. Do not turn onswitches. There may be gas leaks or short-circuits. Use a torch. If there is a fire, try to put it out. If you cannot, call the fire brigade.

If people are seriously injured, do not move them unless they are in danger. Immediately clean up any inflammable products that may have spil led (alcohol, paint,etc). If you know that people have been buried, tell the rescue teams. Do not rush and do not

worsen the situation of injured persons or your own situation. Avoid places where there are loose electric wires and do not touch any metal object in

contact with them. Do not drink water from open containers without having examined it and filtered itthrough a sieve, a filter or an ordinary clean cloth. If your home is badly damaged, you will have to leave it. Collect water containers, food,and ordinary and special medicines (for persons with heart complaints, diabetes, etc.) Do not re-enter badly damaged buildings and do not go near damaged structures.

Evs 3 Environmental Pollution

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