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Read the following statements about acti...

Read the following statements about activated sludge. Br a. It is the effluent passed from anaerobic digester to the settling tank. Br b. A small part of activated sludge is pumped into large tanks called anaerobic sludge digesters. Br C. A small part of activated sludge is pumped back Into the aeration tank to serve as inoculum. Which of the above statements are incorrect?

A

a & c

B

a & b

C

b & c

D

a, b & c

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