Suggest any three ways to protect fresh water from industrial pollution.

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

ii. Harvesting of rainwater to meet water requirements

iii. Treating hot water and effluents before releasing them in rivers and ponds.

iv. 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 process

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

v. Overdrawing of ground water reserves by industry where there is a threat to ground water resources also needs to be regulated legally.