AIR POLLUTION CONTROL L 8
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Transcript of AIR POLLUTION CONTROL L 8
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L-8Effects of air pollution on plants and materials and air pollution
episodes
Air pollution and control
(Elective –I)
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Contents Today’s Lecture
• Effects of air pollutants on plants
• Effect of air pollutant on materials
• Air pollution episodes
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Some important definitionsSome important definitions
1. Necrosis :- Necrosis is the killing orcollapse of tissues
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2. Chlorosis :- is the loss or reduction of the green plant pigment, chlorophyll. The loss of chlorophyll usually results in a pale green or yellow pattern.
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3. Abscission :-Leaf abscission is dropping of tree leaves
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4. Epinasty :- is a downward curvature of the leaf due to higher rate of growth on the upper surface.
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5. Defoliation
• Defoliation is a term which is used to describe the removal or loss of leaves. People usually use it to mean “total defoliation” meaning that all of the leaves on a plant are lost.
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Effects of Air Pollutants on VegetablesPollutants Effects on Vegetables
Aldehydes The upper portions of Alfalfa (is a
flowering plant in the pea family) etc. will
be affected to Narcosis if 250 ppm of
Aldehydes is present for 2 hrs duration.
Ozone (O3) All ages of tobacco leaves, beans,
grapes, pine, pumpkins and potato are
affected. Fleck, stiple (several dots),
bleaching, bleached spotting,
pigmentation, growth suppression, and
early abscission are the effects.
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Peroxy Acetyl
Nitrate (PAN)
Young spongy cells of plants are affected if
0.01 ppm of PAN is present in the ambient
air for more than 6 hrs.
Nitrogen dioxide
(NO2)
Irregular, white or brown collapsed region
on intercostals tissue and near leaf margin.
Suppressed growth is observed in many
plants.
Ammonia &
Sulfur dioxide
Bleached spots, bleached areas between
veins, bleached margins, Chlorosis, growth
suppression, early abscission, and
reduction in yield and tissue collapse
occur.
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Chlorine (Cl2) If 0.10 ppm is present for at least 2
hrs, the epidermis(skin of plants)
and mesophyll of plants will be
affected.
Hydrogen
fluoride,
Silicon tetra
fluoride
Epidermis and mesophyll of grapes,
large seed fruits, pines are affected
and fluorosis in animals occur if
0.001 ppm of HF is present for 5
weeks.
Pesticides &
Herbicides
Defoliation, dwarfing(size reduction),
curling, twisting, growth reduction
and killing of plants may occur.
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Particulates Affects quality of plants, reduces
vigor (plant growth) & hardness
and interferences with
photosynthesis due to plugging
leaf stomata and blocking of
light.
Mercury
(Hg)
Greenhouse crops, and floral
parts of all vegetations are
affected; abscission and growth
reduction occur in most of the
plants.
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Trees damaged by acid rainTrees damaged by acid rain
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EFFECT OF AIR POLLUTION EFFECT OF AIR POLLUTION ON MATERIALON MATERIAL
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Effects on material
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Mechanism of deterioration in polluted atmosphere
1. Abrasion :- solid particles of
sufficient size and travelling at high velocities can cause abrasive action.
Also large sharp edged particles imbedded in fabric can accelerate wear
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2. Deposition and removal :- solid and liquid particles deposited on the surface may not damage the material itself but may spoil its surface appearance.
However removal of these particles may cause deterioration. Although single washing or cleaning may not cause deterioration but frequent can cause.
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3. Direct chemical attack:- Some air pollutants can react with materials directly or indirectly to cause deterioration.
e.g. :- Bleaching of marble by SO2
Tarnishing of silver by H2S
Etching of metal surfaces by acid mist
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4. Indirect chemical attack :- certain materials absorb some pollutants and get damaged when pollutant undergo chemical changes.
e.g.:- SO2 absorbed by leather converted to H2SO4, which deteriorates the leather
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5. Corrosion :- Atmospheric deterioration of ferrous metals is by electrochemical action i.e. corrosion
. This is because of air pollutants and moisture present in the atmosphere.
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Material Type of damage
Principal air pollutants
Other environmental factors influencingrate of attack
Metals Corrosion, soiling andtamishing
SOx and other acid gases
Moisture , temp., air, salt
Building materials
Surface erosion, discoloration, leaching and corrosion
SOx and other acid gasesAcid mist and sticky PM
Moisture , freezing temp.,
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Paints Discoloration, softened finish,Surface erosion
SO2, H2S, O3, Sticky particulate
Moisture,sunlight, fungus and other micro-organisms
Textiles Soiling, spotting, reduces tensile strength
SOx, NOx, other acid gases, particulates
Moisture , sun light, physical ware
Leather Weakening,powdered surface
SOx, other acid gases,
Physical ware
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Paper Embrittlement SOx, other acid gases
Moisture , sun light, physical ware
Dyes Fading , colour change
NOx, Ozone and oxidantrs
Moisture , sunlight
Ceramics Changes in surface appearance
HF, other acid gases
Moisture
Rubber Cracking, weakening
Ozone oxidants
Sunlight
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WELFARE EFFECTS FOR CRITERIA POLLUTANTS.
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Pollutant Welfare Effects
Carbon Monoxide (CO)
Sulphur Dioxide (SO2)
Contribute to the formation of smog.
Contribute to the formation of acid rain, visibility impairment, plant and water damage, aesthetic damage.
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Nitrogen Dioxide (NO2)
Ozone (O3)
Contribute to the formation of smog, acid rain, water quality deterioration, global warming, and visibility impairment.
Plant and ecosystem damage.
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Particulate Matter (PM)
Lead (Pb)
Visibility impairment, atmospheric deposition, aesthetic damage.
Affects animals and plants, affects aquatic ecosystems.
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AIR POLLUTION EPISODES
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Air Pollution Episodes
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Meuse Valley-Belgium, 1930
• About 60 died (mostly elderly)
• Sore throats, shortness of breath, cough, phlegm, nausea, vomiting
• SO2, sulfur dioxide
• H2O (water vapours)
• SO4 , sulfuric acid mist
• Cattle, birds and rats died
• Got little news coverage
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Cont…….
Fumigation of a valley floor caused by an inversion layer that restricts diffusion from a stack
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Donora, Pennsylvania—Oct. 1948
• Monongahela River Valley
• Industrial town—steel mill, sulfuric acidplant, freight yard, etc.
• Population—14,000
• Steep hills surrounding the valley
• Oct 26—temperature inversion (warmair trapping cold air near the ground)
• Stable air, fog, lasted 4.5 days
• 20 died and 7000 ill
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Environs of Donora, Pennsylvania. Horseshoe curve of Monongahela River is surrounded by mountains. Railroad tracks are located on both sides of the river.
Low-lying stretch of Monongahela valley between railroad and river is natural trap for pollutants.
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Poza Rico, Mexico 1950
• Single source– high sulfur crude oil
• Hydrogen sulfide (H2S)
• Flare went out
• Inversion in valley
• 22 sudden deaths, 320 hospitalized
• All ages affected
• Forerunner of Bhopal
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December 1952 Great London Smog
• Cold front, Londoners burned soft coal
• Factories, power plants
• Temperature inversion
• 5 days of worst smog city had ever seen
• Public transportation stopped
• Indoor concerts had to be cancelled because no one could see the stage, etc.
• 4000 died
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London smog repeats
• Repeated in 1956 and 1962 respectively
• 1000 and 700 dead respectively
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London smog pictures
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Weekly death registered from diseases of the lungs and heart in the London Administrative County around the time of the severe fog in December, 1952.
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Total death in Greater London and air pollutants levels measured during the fog of December 1952
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Seveso, Italy --Dioxin• July 10, 1976, north of Milan
• A valve broke at the Industry Chimichee Meda Societa Azionariachemical plant
• Cloud of 2,3,7,8 tetrachlorodibenzo-para-dioxin (TCDD) traveled southwest through Seveso toward Milan
• Contaminant of herbicide
• 200 people suffered skin diseases and liver problems
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Bhopal, India Dec. 3, 1984• Union Carbide pesticide plant leak kills up to
2,000 with up to 350,000 injured and 100,000 with permanent disabilities
• Methyl isocyanate (MIC)—used as an intermediary in manufacture of Sevin(Carbaryl)
• CO + Cl = phosgene
• Phosgene + methylamine = MIC
• MIC—irritant to the lungs---edema, fluid (cause of death, corneal opacity (blindness)
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• MIC is heavier than air
• 25 km2 area covered
• MIC is water soluble gas
• Leak was stopped after 40 minutes by hosing down the tank with cold water.
• Disaster management plan was not in existence
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Hundreds Troubled by 'World Trade Center Cough‘ NYC fire fighters, school workers have 9/11 breathing
problems, new studies say
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Q1. ___________ is the killing or collapse of tissues.
Q2. ____________is the loss or reduction of the green plant pigment, chlorophyll.
Q3. _________________is dropping of tree leaves.
Q4. ________________is a downward curvature of the leaf due to higher rate of growth on the upper surface.
Q5. Solid particles with sufficient size and high velocity causes _________________.
Objective Questions
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Q6. _____________ is electrochemical process.
Q7. Toxic gas ___________ was responsible for Bhopal gas tragedy in 1984.
Q8. MIC is formed by combination of ____________ and ______________.
Q9._____________ causes cracking of rubber.
Q 10.__________________ is affected by pollution because of refineries.
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Theory QuestionsQ1. Define
1. Epinasty
2. Abscission
3. Chlorosis
4. Necrosis
Q2. Write Effects of following pollutants on plants
1. Aldehydes
2. Ozone
3. Particulates
4. NO2
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Q3. Write short notes on
1. Mechanisms of deterioration in polluted atmosphere.
2. London smog
3. Bhopal gas tragedy
4. Air pollution episodes
Q4. Give tabular format w r t
• Pollutant
• characteristics
• Sources
• Health Effects
• Welfare Effects for SO2, CO and O3