CAUSES OF WATER POLLUTION
The causes of water pollution may be due to -
-biotic community dumping fertilizer or waste in the water reservoir .As a result get polluted ,due to mixing of fertilizer directly with water body leads to eutrophication in the water reservoir -which leads to decrease in dissolve oxygen level in the water body,and low level oxygen is harmful for all aquatic organisms -due less oxygen in water body fishes and other aquatic organism die easily and due to the death of aquatic organism the BOD (Biological oxygen demand) of water body increase ,by which organic load on water body increases and it causes severe water pollution.
WATER POLLUTION DUE TO INDUSTRIES
The hazardous waste materials from different industry when mix with water body directly it hamper the life of aquatic animals ,due to these toxic chemicals the aquatic animals life ,zooplankton ,phytoplankton dies directly - it hamper the biotic community directly , for this water get polluted directly
SOURCES OF WATER POLLUTION
The principal sources of water pollution are as follows-
Sewage-
When the domestic waste water ,latrine waste water ,bathroom water ,household waste water mix directly with water reservoir then the water get polluted .
INDUSTRIAL POLLUTION
Industrial hazardous chemicals and toxic chemicals of industry when mix directly with the water body then water get polluted .The pollutant from industries like Paper ,tannery,clothes,jute ,steel,fertilizer, when mix with water body directly then water get polluted . The water get unfit for industrial,recreational and other uses .The industrial pollutants contain number of toxic chemicals as follows
1.Mercury-It passes into food chain ,poison fish and other fauna that produces creeping deformity in human beings called Minamate disease
2-Lead and Cadmium -It causes renal damage,hypertension,anaemia,damage to placenta and testes
3.Acid,Alkali,Poisons and Other liquid pollutants -They kill fishes and other aquatic life beside being toxic to human beings.
THERMAL POLLUTION
It is caused by addition of hot pollutants and hot water into water causes high tempreature and reduces the dissolved oxygen content of water body
POLLUTION DUE TO PETROLEUM OIL
Oil sticks and oil spill and discharge of industries causes oxygenation water ,inhibits the plant growth and kill aquatic animals,sometimes oil leakage from petroleum carrier ship is the measure cause of marine water pollution
AGRICULTURAL POLLUTION
Now-a-days in order to increase agricultural productivity huge amount of fertilizer and pesticides have been largely used and it also a main causes of water pollution .Water also polluted by acid rain.
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