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 

Subtopic:  Microbes in Sewage Treatment |
 75%
NEET - 2020
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NEET 2023 - Target Batch - Aryan Raj Singh
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