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Water pollution takes place when effluents from factories are lots in to the river. Paper mills, sugar mill tannery lot in effluents in rivers or allow them to stagnate on land. These effluents seep through or pollute under groundwater effluents from large no of tanneries in North Ascot district in Tamil Nadu have polluted well water in a large no of villages.


The most widespread source of water pollution is disposal of sewage of Urban centers into rivers. The Ganga, Yammuna are polluted water affected organic live river & water born diseases like typhoid affect human pollution.
The water drawing from the field is enter rivers & lake and pollutes them enrichment of water by nutrient results in entrophozation of lakes this results in excessive growth of algae & depletion of dissolved oxygen aquatic organisms including fish cannot survive under such conditions.

Ocean water are polluted by discharge of sewage from cities located along the coast, effluent from factories along the coast & discharge of sewage from cities located along the coast & discharge from polluted rivers. Eutrophication of coastal marshes & swamps also effect mariain life. In the open ocean oil spills from tankers has adverse effect on Marian life. Such oil spills cause pollution over wide areas owing to spread of oil by waves & currents.
Water is every thing for human being without water human being cannot survive our is polluted in many ways.
E.g.:- The waste of material of factories when thrown to rivers pollutes water. Some people use rivers to wash their cloths & to take bath.
Water is indispensable for our life. About 2/3of earth is water. No organisms can survive with out water. So keeping water free from any pollutant is very important. Water is said to be “polluted” when it is changed it is changed in its quality & composition directly or indirectly by men activity so that it became less stable for drinking, domestic or any other purpose. Polluted water transmits a large no. of disease in man.
They are cholera, typhoid & other viral diseases.
Causes:- The river, pounds, lakes & seawater is polluted with verity of liquid & solid wastes. These are due to population explosion, industrialisation & under water atomic explosion.
Sewage from washing, kitchen, urine etc is thrown into rivers from cities located on the bank. The water taken from such rivers for drinking purpose is to chlorinate before it is used.

Minerals & organic wastes carried to lake, river & sea from agricultural fields with nitrogen & phosphate fertilizer. The waste become deoxygenated & toxic, so this cannot support aquatic life.
The large contributors to water pollution are no. of industrial wastes. Industrial waste includes mercury from paper industry & combustion of forest fuels. Lead is released from rock bearing metals. Copper & zinc are also released as industrial wastes. They act as food contaminants.
Liquid radioactive waste released into sea from nuclear installations. Radioactive tests are performed on high seas. The current of sea curry the contaminates all over there by polluting the water. These molecules get into aquatic animals. Fish consume these nuclear contaminates & them fish cannot be consumed by man.

Control of water pollution

1. Rapid biodegradable substitutes for pesticides should be employed.
2. Restricted application of DDT for malaria control programmers.
3. Recycling of waste products as far as possible should be done.
4. Recently a national programmer is undertaken by central government to clean the river Ganga & keep it pollution.




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