Dilution method of disposing of sewage, is not preferred to
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Waste Water Engineering
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In case of Imhoff tanks,
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If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is
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If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is
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If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is
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If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is
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If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is
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Acid regression stage of sludge digestion at a temperature 21°C extends over a period of
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For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is
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A manhole is generally provided at each
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The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
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Removal of oil and grease from sewage, is known
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Are available in size Stoneware sewers
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Oxidation process results in the formation of
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The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be
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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
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In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1% to p2% the volume V2 is
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The minimum diameter of sewer to be adopted is
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In a grit chamber of a sewage treatment plant,
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In a trickling filter
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