Waste Water Engineering
The non-clog pump which permits solid matter to pass out with the liquid sewage, is

Centrifugal pump
Pneumatic ejector
Reciprocating pump
None of these

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Waste Water Engineering
In the activated sludge process

Sludge is activated by constant stirring
Aeration is done with an admixture of previously aerated sludge
Water is removed by centrifugal action
Aeration is continued till stability

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