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Social Science · 2022 · 2 marks
CBSE 2022 · Region 2 · Set 3 · Q2
How can the industrial pollution of fresh water be reduced?
How can the industrial pollution of fresh water be reduced ?
Marking-scheme solution
(i) Minimising use of water for processing
(ii) By reusing and recycling it in two or more successive stages.
(iii) Harvesting of rainwater to meet water requirements
(iv) Treating hot water and effluents before releasing them in rivers and ponds
(v) 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.
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CBSE Class 10 Social Science past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.