Waste Water Engineering
The rate of accumulation of sludge in septic tanks is recommended as

30 litres/person/month
25 litres/person/year
25 litres/person/month
30 litres/person/year

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Waste Water Engineering
The clarigesters are

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

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