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Civil Engineering - Waste Water Engineering

Exercise : Waste Water Engineering - Section 6
21.
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of
15 days
30 days
60 days
90 days.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
If the pH value of sewage is 7
it is acidic
it is alkaline
it is neutral
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Pick up the correct statement from the following :
Maximum daily flow = 2 times the average daily flow
Minimum daily flow = x average daily flow
Sewers are designed for minimum permissible velocity at minimum flow
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Pick up the incorrect statement from the following :
The mixture of water and waste products, is called sewage
The treated sewage effluents, are generally used for irrigating the crops
The process of collecting, treating and disposing off the sewage, is called sewerage
The old convergency system was definitely better than water carried sewerage system
None of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Pick up the correct statement from the following :
Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
Solubility of oxygen in sewage is 95% of that of distilled water
Dissolved oxygen content of sewage, may be determined by Winkler's method
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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