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Solution


Q.

Which of the following is put into anaerobic sludge digester for further sewage treatment             [2020]
1 Primary sludge  
2 Floating debris  
3 Effluents of primary treatment  
4 Activated sludge  

Ans.

(4)

The sediment in a settling tank is called activated sludge. A small part of it is pumped back into the aeration tank to serve as the inoculum. While the remaining major part of the sludge is pumped into large tanks called anaerobic sludge digesters.