Name three industrial chemicals that pollute water.

Explanation

Process Wastes : These are from inorganic process wastes and organic process wastes. Inorganic process wastes are present in the effluents from chemical industries, electroplating industries, metallurgical and petroleum industries etc. These are mainly toxic but do not generally produce biological problems. Organic process wastes are from food processing industries, dairies, distillaries, paper, textile mills etc. It is very difficult to dispose organic process wastes.
Chemical Wastes : Industries that manufacture acids, bases, detergents, explosives, dyes, insecticides, fungicides, fertilisers, silicones, plastics, resins, etc. which are generally used as raw materials for further manufacturing processes, contain chemical wastes. These wastes are produced during sedimentation, flocculation, washing, filtering, evaporation, distillation, electrolysis, absorption, crystallisation, burning, centrifusing etc. Chemical wastes are generally acidic, basic or toxic materials, coloured and inflammable. Chemical wastes require biological oxidation treatment methods like thickening filters, activated sludge or logooning.
The international standards fixed for drinking water.
Fluoride concentration - 1 ppm
Lead -50 ppb
Sulphate `- lt` 500 ppm
Nitrate -50 ppm