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Waste Water Engineering

Waste Water Engineering
During purification process of sewage the gas given off, is

All listed here
Carbon dioxide
Hydrogen
Ammonia

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Waste Water Engineering
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done

Manually
Mechanically
Hydraulically
Electrically

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Waste Water Engineering
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

0.35 m/sec
0.45 m/sec
0.40 m/sec
0.30 m/sec

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Waste Water Engineering
The minimum diameter of sewer to be adopted is

15 cm
10 cm
25 cm
12.5 cm

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Waste Water Engineering
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

Petrol vapours
Methane gas
Hydrogen sulphide gas
Carbondioxide gas

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Waste Water Engineering
Aerobic bacterias

Oxidise organic matter in sewage
Consume organic matter as their food
Flourish in the presence of free oxygen
All of these

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