31. The gas from sludge digestion tank is mainly composed of
32. The maximum efficiency of BOD removal is achieved in
33. The minimum and maximum diameters of sewers shall preferably be
34. The biochemical treatment of sewage effluents is essentially a process of
35. Sewerage system is usually designed for
36. Sewage treatment units are normally designed for
37. Generally the detention period for grit chambers is kept as
38. Activated carbon is used for
39. The polluted water is one which
40. In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be
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