Civil Engineering :: Waste Water Engineering
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The pH value of fresh sewage is usually
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The moisture content of a sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
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Inter-distance between ventilation columns in a sewer line is kept
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If q is the average sewage flow from a city of population P, the maximum sewage flow
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The factor responsible for purification of sewage in river is
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If the peak discharge of a storm water drain (S.W. Drain) is e.xpected to exceed 150 cumecs, the free board to be provided, is
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PH value of sludge during alkaline regression stage, is
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Depletion of ozone layer in the outer atmosphere may cause
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The spacing of bars of perforations of fine screens used for the treatment of sewage, is
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The self-cleansing velocity of water flowing through pipe lines, is
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Ventilating shafts are provided to a sewer line at every
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Which one of the following part of human body withstands minimum radiation
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The water carried sewerage system removes
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The sludge does not contain waste water from
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If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is
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Design period of 40 to 50 years is adopted for
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The pH value of sewage is determined with the help of
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Lead caulked joints are used for laying
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Pick up the correct statement from the following :
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For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed
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At the junction of sewers
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Primary treatment of sewage consists of removal of
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The rainfall at any place may be determined by
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In trickling filter, B.O.D. is reduced to
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Which one of the following gases is most significant as air pollutant
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Which one of the following statements regarding septic tanks is wrong :
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In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,
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The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is
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. The Chezy's constant C in the formula V = C \(\sqrt{rs}\) depends upon
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Afive day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is
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The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is
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. For the open drain (N = 0.025) shown in the below figure, the discharge is
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If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is
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The most widely used pump for lifting sewage is
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The sewer which resists sulphide corrosion, is
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For large sewers, maximum distance between manholes may be
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The first stage of neutral process of sludge digestion, is
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. Lead acetate test in sewer manhole is done to test the presence of
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Dried sewage after treatment is used as
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The use of coarse screens for the disposal of sewage, may be dispensed with by
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Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for
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5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
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Imhoff cone is used to measure
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For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is
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