The total volume of a primary settling tank is 2500 m3 and the waste water flow is 25 x 106 litres per day. The detention time in settling tank is
Acceptable lower limit of bacteria removal through activated sludge process is
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Match List-I (Treatment process) with List-ll (Classification) and select the correct answer using the codes given below the lists:
Codes:
If the efficiencies of BOD removal of first-stage and second-stage trickling filters are each 65,0%, then what is the overall BOD removal efficiency of these filters?
A septic tank of 7 m3 in volume serves for 5 people. If the rate of accumulation of sludge is 70 litres per capita per year and sludge is removed when it occupies 50% of its volume, what is the cleaning interval of septic tank?
The maximum efficiency of BOD removal is achieved in which of the following?
What does the biological layer sticking to the trickling filter consist of?
What is the most generally adopted detention period (approximately) for a septic tank under the Indian conditions?
Which one of the following describes the short- circuiting occurring in a sedimentation tank?