Civil Engineering :: Waste Water Engineering
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Sewer pipes need be checked for
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If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of
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The ratio of design discharge to the surface area of a sedimentation tank is called
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The value of Chezy's constant
C = \( \frac { [23+0.00155/s ]+1/n} { 1+[23+0.00155/s]+n\sqrt{}r} \)
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In the activated sludge process
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To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by pottassium dichromate in the presence of
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The discharge per unit plan area of a sedimentation tank, is generally called
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In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is
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D is the diameter of a circular sewer and α is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is
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For detecting the nitrites in the sewage, the matching colour may be developed by adding
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The suitable cross-section of sewers to carry combined flow, is
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Hazin's formula Vs = 418 (Gs - Gw)d [ \([\frac { 3T +70 } { 100 } ]\)is used for the settlement velocity of the particles of diameter
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. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is
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Stone ware pipes are
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Skimming tanks are
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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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Assertion (A) : The determination of pH value of sewerage is important.
Reason (R) : The efficiency of certain treatment methods depends upon the availability of pH value.
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With self cleansing velocity in sewers
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Aerobic activity is maximum
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In sewers designed with self cleansing velocity,
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Which one of the following resists hydrogen sulphide corrosion
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The sewerage system consists of
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Hume steel pipes are
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Drop manholes are the manholes
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Boussinesq's equation for ascertaining unit pressure at a depth H on sewers due to traffic loads, is
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The laying of sewers is done with
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The rational formula for peak drainage discharge, was evolved by
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The sewage treatment in septic tanks is due to
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In 1000 kg of sewage, the total solids approximate
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Pathogens (or pathogentic bacterias) in water may cause
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Sewer manholes are generally provided at
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The sewers
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Before discharging the foul sewage into rivers, it is generally treated by
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The settlement of a particle in sedimentation tank, is affected by
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If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is
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Oxidation process results in the formation of
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Dry weather flow is :
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As compared to fresh river water, sea water contains oxygen
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The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is
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. If γw is the unit weight of water, r the hydraulic mean depth of the sewer and S the bed slope of the sewer, then the tractive force exerted by flowing water, is
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In detritus tanks,
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The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is
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In areas where rainy season is limited to a few months, the type of sewerage system recommended is
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\(\frac { 3 } { 4 } \) rd or \(\frac { 1 } { 4 } \)th extra space is left in sewer pipes at maximum discharge for
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If n is the rugosity coefficient, r is the hydraulic depth, s is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = \(\frac { 1 } { n } r^2/3 s^1/2\)
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Pick up the correct statement from the following :
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. Antisyphonage pipe is fitted
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For drains up to 15 cumecs, the depth d and width B are related by
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