Page 209 - Science Class 08
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industrial waste water. The plant regenerates
rapidly and has a tremendous capacity to
absorb nitrogen, phosphorous and similar
chemical pollutants.
In India, the enactment of ‘Preven on and
Control of Water Pollu on Act’ in 1974 has
helped to a certain extent to prevent water
pollu on.
Excessive nutrients in water cause excessive
growth of algae. Once these algae die, they It is suggested that adequate legisla ve
measures have to be adopted by every state to
serve as food for decomposes like bacteria. A
lot of oxygen in the water body gets used up. ensure:
This results in a decrease in the oxygen level v Proper disposal of sewage and industrial
which may kill aqua c organisms. wastes.
Due to the discharge of chemicals and oils into v Recycle of waste water through proper
the sea the marine life has been seriously methods of purifica on.
affected. v Punishment of erring industries which do
Preven on and Control of Water Pollu on not install, effluent devices in their
Construc on of sep c tanks, oxida on ponds factories.
fi er beds, waste water treatment plants and The river Ganga has become the vic m of
municipal sewage plants should be sincerely waste disposal in huge quan ty through its run
promoted for the removal of various pollutants of 2525 km from Gangotri to Ganga Sagar. An
from the sewage before it is pped into rivers ambi ous plan to save the river, called the
or sea. Ganga Ac on Plan was launched in 1985. It
People should not dump any kind of waste aimed to reduce the pollu on levels in the
materials in to the rivers, lakes, ponds or seas. river. However, the increasing popula on and
Industrial effluents must be treated properly industrialisa on have already damaged this
before they are discharged into the water mighty river beyond repair.
bodies. Potable Water
Animal excreta should not be allowed to be Water which is suitable for drinking is called
washed away into the water bodies. It can be potable water.
used in gas plants to produce gas for ligh ng It has the following properties:
and cooking.
v It must be colourless and odourless.
It is very essen al to have modern sewage
v It must be free from suspended impuri es.
treatment plants for every city and towns of
India so that the biodegrable pollutants can be v It must be free from germs.
removed from it and pure water obtained for How to Make Water Safe for Drinking?
re cula on. Water can be made safe for drinking in the
Water hyacinth, an aqua c weed, has come following ways:
into prominence for purifying domes c and
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