11th Class Chemistry Environmental Chemistry

  • question_answer 11)
    What are the major causes of water pollution? Explain.


    The main sources responsible for the pollution of water are: (a) Sewage and domestic wastes, e.g., human excreta, sewage, sludge, soaps and detergents, domestic wastes, etc. (b) Industrial effluents: These contain toxic chemicals and hazardous compounds both organic and inorganic. (c) Agricultural discharges: These include fertilizers, pesticides, insecticides, herbicides, etc. (d) Thermal discharges: Used water from power plants and industries is discharged directly into water bodies. The temperature of water bodies thus, increases. This brings down DO level which is harmful for aquatic animals. (e) Oil: Oil and oil wastes enter rivers and other water bodies. Since, oil is insoluble in water, it floats and spreads rapidly into a thin layer. This layer on the surface of water lowers DO level in water.  

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