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1) Name two things that can be made from sludge extracted during treatment of sewage. Answer: Biogas and manure.
2)Vermi-processing toilet is a type of toilet which treats human excreta through earthworms. Earthworms turn human excreta into a cake of vermin which serves a good variety of natural manure. It provides the proper disposal of human excreta thus avoiding pollution of the ecosystem outside.
3) Tuesday, 22 March
World Water Day 2022
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