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प्रश्न
List the important steps in primary treatment of sewage.
अति संक्षिप्त उत्तर
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उत्तर
(i) Floating debris is removed by filtration.
(ii) Grit and other suspended solids are removed by sedimentation. The settled solids form primary sludge, while the liquid effluent proceeds to secondary treatment.
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अध्याय 14: Microbes in Human Welfare - EXERCISES [पृष्ठ ७६१]
