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Read the extract given below and answer the Overdrawing of ground water reserves by Questions:
questions that follows: industry where there is a threat to ground water
(i) How many treatments are there for industrial
Every litre of waste water discharged by our resources also needs to be regulated legally. effluents? Name them.
industry pollutes eight times the quantity Particulate matter in the air can be reduced by
(ii) How could particulate matter in the air be of fresh water. How can the industrial fitting smoke stacks to factories with electrostatic pollution of freshwater be reduced? Some precipitators, fabric filters, scrubbers and inertial suggestions are reduced?
(iii) What could be done to reduce pollution of machinery and equipment ?
(i) minimising the use of water for processing by separators. Smoke can be reduced by using oil or reusing and recycling it in two or more successive gas instead of coal in factories. Machinery and stages.
(ii) harvesting of rainwater to meet water be fitted with silencers. Almost all machinery [ requirements. can be redesigned to increase energy efficiency; treating hot water and effluents before releasing and reduce noise. Noise absorbing material may ]
(iii) treating hot water and effluents before releasing and reduce noise. Noise absorbing material may them in rivers and ponds. Treatment of industrial be used apart from personal use of earplugs and effluents can be done in three phases.
(a) Primary treatment by mechanical means. This The challenge of sustainable development involves screening, grinding, flocculation and requires integration of economic development sedimentation.
(b) Secondary treatment by biological process.
(c) Tertiary treatment by biological, chemical and physical processes. This involves recycling of waste water.

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