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  4. Microbes are used in 1. primary treatment of sewage 2. secondary treatment of sewage 3. anaerobic sludge digester 4. production of bioactive molecules

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Q. Microbes are used in
1. primary treatment of sewage
2. secondary treatment of sewage
3. anaerobic sludge digester
4. production of bioactive molecules

Microbes in Human Welfare

Solution:

Microbes are not used in the primary treatment of sewage which basically involves settling down of sludge through sedimentation.