How can fresh water be saved from the industrial pollution? Suggest any three ways.

(i) Minimising the use of water for processing by recycling and reusing it in two or more successive stages.

(ii) Harvesting of rainwater to meet water requirement in industries.

(iii) Reducing or eliminating the dangerous materials used in the production process.

(iv) Reducing the waste produced so that the wastewater will have lesser contaminants.

(v) Treating hot water and effluents before releasing them in rivers and ponds. Treatment of industrial effluents can be done in three phases-

(a) Primary treatment by mechanical means. This involves screening, grinding, flocculation and sedimentation.

(b) Secondary treatment by biological, chemical and physical processes. This involves recycling of wastewater.