En Ppt Evs Swp Water Pollution
Transcript of En Ppt Evs Swp Water Pollution
-
7/27/2019 En Ppt Evs Swp Water Pollution
1/29
Water Pollution
-
7/27/2019 En Ppt Evs Swp Water Pollution
2/29
-
7/27/2019 En Ppt Evs Swp Water Pollution
3/29
Some of the stuff that it dissolves / suspends is good for us
Others, not so good
-
7/27/2019 En Ppt Evs Swp Water Pollution
4/29
Can you name 5 thingsthat dissolve in water?
Know of any 2 that can becalled pollutants thosedangerous to life ?
-
7/27/2019 En Ppt Evs Swp Water Pollution
5/29
If we drink polluted water, we can get sick
-
7/27/2019 En Ppt Evs Swp Water Pollution
6/29
Figure out some pollutants
C
T
S K
+ + _ _ _ _ _ _ _
Led Zeppelin
Black SabbathDeep Purple
Iron Maiden_ _ _ _ _ _ _ _ _ _
+ _ _ _ _ _ _ _
G H
Sounds like + _ _ _ _ _ _ _ _
Clue: toothpaste
-
7/27/2019 En Ppt Evs Swp Water Pollution
7/29
Figure out some pollutants
C T
S K
+ + ARSENIC
Led Zeppelin
Black SabbathDeep Purple
Iron Maiden HEAVY METAL
+ NITRATEG H
Sounds like + FLUORIDE
Clue: toothpaste
-
7/27/2019 En Ppt Evs Swp Water Pollution
8/29
How do we know that water is polluted?
Sometimes it stinksbut not always
Sometimes polluted water changes colour..but not always
Sometimes it tastes different ..but not always
-
7/27/2019 En Ppt Evs Swp Water Pollution
9/29
How do we know that water is polluted?
Water pollution can be confirmed only by testing it in a lab
-
7/27/2019 En Ppt Evs Swp Water Pollution
10/29
Sources of water pollution are generally grouped into
two categories
Non-point source of pollution:
Contamination gathered by water over a large area.
Point-source of pollution:
Contaminants enter a waterway at a discrete point
-
7/27/2019 En Ppt Evs Swp Water Pollution
11/29
Water can get polluted naturally
When water seeps into the ground, it absorbs differentsubstances depending on the type of soil and rock that itflows through.
-
7/27/2019 En Ppt Evs Swp Water Pollution
12/29
Water can get polluted naturally
Some of these substances (arsenic, iron, fluoride, etc.)can be harmful to our health.
Natural pollution is a non-point source of pollution
-
7/27/2019 En Ppt Evs Swp Water Pollution
13/29
Arsenic
Fluoride
Natural pollution can introduce chemicals that collect in our bodies.
Over time this can cause chronic problems and even life threatening diseases.
In groundwater
In groundwater
-
7/27/2019 En Ppt Evs Swp Water Pollution
14/29
Does Man Pollute Water?
If you had a bottle of life-preserving fluid
on which your life depended, would youpour into it all your sewage and rubbish,
along with any other poisonous chemicalsyou could find? And yet, that is exactly
what we are doing to our water supply allover the world.
This is what a young person like you has to say:
-
7/27/2019 En Ppt Evs Swp Water Pollution
15/29
The various ways in which man pollutes waterUntreated or inadequately treated municipal sewage
Yamuna, when it leaves Delhi, resembles a sewer full of the
citys wastes. A few hundred kms downstream is Agra, where
this sewer is the main municipal drinking water source.
YUCK!!
eutrophication
An example of Point source of pollution
-
7/27/2019 En Ppt Evs Swp Water Pollution
16/29
Reaches ground water bodies
Untreated sewage seeps in and contaminates groundwater aquifers
Such aquifers show a higher than acceptable level of nitrate content
The various ways in which man pollutes waterUntreated or inadequately treated municipal sewage
An example of Point source of pollution
-
7/27/2019 En Ppt Evs Swp Water Pollution
17/29
The various ways in which man pollutes water
When garbage is dumped in alandfill, toxic chemicals leach intothe soil and groundwater.
Dumping garbage in surfacewater bodies
-
7/27/2019 En Ppt Evs Swp Water Pollution
18/29
Over 10 million people
bathe in the Ganga daily!
The various ways in which man pollutes water
Washing and bathingintroduces phosphates andother chemicals into water
-
7/27/2019 En Ppt Evs Swp Water Pollution
19/29
The various ways in which man pollutes water
Agriculture is a majorsource of groundwater
contamination.
AgricultureAn example of Non- Point source of pollution
dissolve in irrigation water or rainwater.
They contaminate surface water and groundwater with pollutants like
nitrates, phosphates, and non degradable synthetic
organic pollutants.
-
7/27/2019 En Ppt Evs Swp Water Pollution
20/29
The various ways in which man pollutes waterIndustry
Agro industries (sugar, food processing, pulp and paper, distilleries) their
wastes have high concentration of dissolved organic matter.
Chemical Industries If their wastes are not treated properly,
the chemicals can destroy our soil and water resources.
Petroleum refining water used in the process needs to be
separated from all the oil before releasing it into
naturebut is that done?
An example of Point source of pollution
Minamata
disease
-
7/27/2019 En Ppt Evs Swp Water Pollution
21/29
The various ways in which man pollutes waterIndustry
Thermal power plants water is needed to cool the process.
The water gets hot and when its released into a larger
water body, it upsets the ecology by modifying the
delicate temperature balance.
This is called Thermal pollution
An example of Point source of pollution
-
7/27/2019 En Ppt Evs Swp Water Pollution
22/29
Effluent treatment plants
Liquid wastes from an industry aretreated in effluent treatment plants.
Large industries have in-house effluent
treatment plants.
Its expensive for small industries to
have such plants of their own.
In some industrial estates, a group of
small industries have a common
effluent treatment plant.
-
7/27/2019 En Ppt Evs Swp Water Pollution
23/29
A RE-CAP
Water can be polluted by man
Water can be polluted naturally
Sewage in our water bodies
Garbage dumps
Washing and bathing
Pesticides and fertilizers
Industries
-
7/27/2019 En Ppt Evs Swp Water Pollution
24/29
Divide the class into 5 teams
Draw as many dashes as in the name of a water pollutant or a pollution cause.
Team A starts. They guess a letter. The teacher puts in the letter at the correct place, if it isthere in that name.
Else, the letter is written down on one side.
A maximum of 10 wrong guesses are allowed.
The team gets as many points as letters on the side (maximum of 10).
The team with the lowest number of points wins.
Hangman
-
7/27/2019 En Ppt Evs Swp Water Pollution
25/29
Eutrophication (pronounced as you-tro-fi-kay-shun)
When wastes with high organic content (such as sewage wastes) are
dumped into a water body like a lake or pond, eutrophication can occur,killing all life in the water body.
Organic wastes are rich in nutrients (nitrates and phosphates)
They stimulate excessive plant growth especially weedy species
-
7/27/2019 En Ppt Evs Swp Water Pollution
26/29
Eutrophication
On dying, the plants further add to the organic waste in water.
Microorganisms that decompose the organic material in water use upa lot of dissolved oxygen.
This depletes the available oxygen in the water and upsets theecological balance, since fish and other life forms perish withoutadequate oxygen.
Eventually all the oxygen is used up.
-
7/27/2019 En Ppt Evs Swp Water Pollution
27/29
Eutrophication
Anaerobic organisms then attack the organic wastes,
releasing gases such as methane and hydrogen sulphide.
The result is a foul smelling, waste filled body of water, quite like many of
the lakes in India.
These water bodies are also natural groundwater recharge systems
and their contamination also leads to groundwater pollution.
-
7/27/2019 En Ppt Evs Swp Water Pollution
28/29
Minamata disease
Industrial wastewater from the Chisso corporation
(manufacturing fertilizers and other chemicals) wasreleased into the Minamata Bay in Japan.
The waste water was rich in methyl mercury.
Mercury content in shellfish in that region increased.
People ate the shellfish and the cats ate theleftovers.
-
7/27/2019 En Ppt Evs Swp Water Pollution
29/29
Strange things started to happen cats had convulsions and died,crows fell from the sky, dead fish floated.
Young children had convulsions and difficulty in
walking and speaking.
People died.
Investigation showed organic mercury poisoning affecting the
nervous system.
First discovered in 1956.
Lawsuits and claims continue till today.