31. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
32. Removal of oil and grease from sewage, is known
33. Are available in size Stoneware sewers
34. Oxidation process results in the formation of
35. The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be
36. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is
37. In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1% to p2% the volume V2 is
38. The minimum diameter of sewer to be adopted is
39. In a grit chamber of a sewage treatment plant,
40. In a trickling filter
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