Waste Water Engineering
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

[(100 + P2)/(100 – P1)] V1
[(100 – P1)/(100 – P2)] V1
[(100 – P1)/(100 + P2)] V1
[(100 + P1)/(100 – P2)] V1

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Waste Water Engineering
The clarigesters are

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

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