GUJCET 2021 Biology Solved Paper

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Question : 6 of 40

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Choose the correct option, which shows correct sequence of substances obtained during sequential process of sewage treatment.

Primary sludge → flocs → effluent → anaerobic sludge
Primary sludge → anaerobic sludge → flocs → effluent
Primary sludge → effluent → flocs → anaerobic sludge
Primary sludge → anaerobic sludge → effluent → flocs

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