WASTE WATER ENGINEERING QUIZ

The clarigesters are

Circular Imhoff double storey tanks without bottom hoppers

Circular Imhoff double tanks with bottom hoppers

Circular septic tanks

Rectangular septic tanks

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For treating the sewage of a large city, you will recommend

A sedimentation tank and an activated sludge treatment plant

None of these

Sedimentation tanks with high rate trickling filters

A plant consisting of Imhoff tanks with low rate trickling filters

TRUE ANSWER : ?
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For detecting the nitrites in the sewage, the matching colour may be developed by adding

Phenol-di -sulphuric acid potassium hydroxide

None of these

Potassium permanganate

Sulphuric acid and napthamine

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The sewerage system consists of

Branch sewer

Lateral sewer

All of these

House sewer

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3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

100 mg/l

300 mg/l

200 mg/l

400 mg/l

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If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by

Chezy

Kutter

Manning

Bazin

TRUE ANSWER : ?
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In detritus tanks,

Detention period is kept 3 to 4 minutes

All listed here

Flow velocity is kept 0.09 m/sec

Organic and inorganic materials are separated

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The most dangerous pollutant in vehicular emissions is

CO₂

O₂

SO₂

TRUE ANSWER : ?
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If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

1 in 100

1 in 120

1 in 60

None of these

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A manhole is generally provided at each

Bend

Junction

Change of gradient

All of these

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