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The rate of accumulation of sludge in septic tanks is recommended as____________________?

/ Civil Engineering Mcqs, Waste Water Engineering / By
The rate of accumulation of sludge in septic tanks is recommended as____________________?

A. 30 litres/person/year
B. 25 litres/person/year
C. 30 litres/person/month
D. 25 litres/person/month