Civil Engineering :: Waste Water Engineering
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In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is
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For detecting the nitrates in sewage, the colour may be developed by adding
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The value of Chezy's constant C = \(\frac { 157.6 } { 1.81+K/\sqrt{r} } \)is used in
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The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning's formula, is given by
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For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of
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The formula V = \(\frac { 1 } { n } \) \(r^2/3\)\(\sqrt{S}\)used for determining flow velocities in sewers, is known as
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The sewage treatment units in which anaerobic decomposition of organic matter is used, are called
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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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The most efficient cross section of sewers in a separate sewerage system is
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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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Pick up the incorrect statement from the following for allowing workers to enter sewers
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The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock's law, is
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In a grit chamber of a sewage treatment plant,
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The rate of accumulation of sludge per person per year, is
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The disintegrating pump in which solid matter is broken up before passing out, is
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The quantity of liquid waste which flows in sewers during the period of rainfall, is known
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The most efficient cross-section of sewers in a combined sewerage system is
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Pick up the incorrect size of stone ware sewers
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The grit and silt of the grit chambers, may not be used for
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In a sludge tank, the gas mainly produced, is
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1000 kg of sewage contains
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The normal values of over flow rates for sedimentation tanks using coagulent, ranges between
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A.
The particular manhole and one manhole on up stream and one manhole on down stream should remain open for 30 minutes |
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B.
Proper tests for the presence of poisonous gases must be carried out |
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C.
The men entering the manhole should be advised to smoke in the sewer |
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D.
Warning signals should be erected |
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E.
None of these. |