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Which of the following is put into Anaerobic sludge digester for further sewage treatment?

1. Floating debris
2. Effluents of primary treatment
3. Activated sludge
4. Primary sludge

Correct answer: Activated sludge

Solution

Activated sludge is the microbial biomass collected after secondary treatment and is commonly sent to an anaerobic sludge digester for stabilization. Floating debris and primary sludge are removed earlier, while effluents of primary treatment are not the sludge fed to the digester.

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