Which one of the following statements is not correct ?

1.	Which one of the following statements is not correct ?
A.	Settling and sludge digestion occur in septic tanks in one compartment
B.	Settling and sludge digestion occur in Imhoff tank in different compartments
C.	Septic tank is a low-rate anaerobic unit whereas an Imhoff tank is a high rate anaerobic unit
D.	The rate of sludge accumulation in septic tank is approximately 40-70 litres/capita/year
Answer» D. The rate of sludge accumulation in septic tank is approximately 40-70 litres/capita/year

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Which one of the following statements is not correct ?

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