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Civil Engineering - Water Supply Engineering - Discussion

Discussion Forum : Water Supply Engineering - Section 7 (Q.No. 9)
Water Supply Engineering
9.
Pick up the incorrect statement from the following :
The water entering the slow sand filters should be treated by 9.386 coagulants
The depth of water on the filter should be twice the depth of the filter sand
When the filter head is 0.75 times the depth of filter sand, the water obtained is purest
The cleaning of slow sand filters is done by back washing
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
3 comments Page 1 of 1.
Rocky said:   7 years ago
SSF is not required for cleaning back washing. So the answer is D.
(1)
SSS said:   7 years ago
Cleaning of slow sand filter is done by Scrapping. So Option D is correct.
Manu said:   4 years ago
Can anyone explain option A?
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