Waste Water Engineering
The clarigesters are

Circular Imhoff double storey tanks without bottom hoppers
Circular septic tanks
Circular Imhoff double tanks with bottom hoppers
Rectangular septic tanks

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Waste Water Engineering
Pick up the incorrect statement from the following for allowing workers to enter sewers

The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
Warning signals should be erected
Proper tests for the presence of poisonous gases must be carried out
The men entering the manhole should be advised to smoke in the sewer

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