Civil Engineering - Water Supply Engineering - Discussion
Discussion Forum : Water Supply Engineering - Section 7 (Q.No. 47)
47.
De-chlorination is followed by
Discussion:
4 comments Page 1 of 1.
Shyam saheb dhara said:
3 years ago
Yes, you are correct @Gajan Rana.
Anirban Roy said:
5 years ago
Yes, dechlorination is done after super chlorination.
Plain chlorination is where raw water directly chlorinated. (0.5 mg/l).
Pre chlorination can be done before or after sedimentation. The former is preferred as then the chlorine removes a portion if odour, microorganisms etc, and reduces the load on the filter. (1. 5-5 mg/l).
Post chlorination is done after filtration at the end. It is a normal procedure.
When chlorination is done beyond BEP, then called superchlorination. All added chlorine remain as residual chlorine.
After this, water is dechlorinated by SO2, sodium thiosulphate.
Plain chlorination is where raw water directly chlorinated. (0.5 mg/l).
Pre chlorination can be done before or after sedimentation. The former is preferred as then the chlorine removes a portion if odour, microorganisms etc, and reduces the load on the filter. (1. 5-5 mg/l).
Post chlorination is done after filtration at the end. It is a normal procedure.
When chlorination is done beyond BEP, then called superchlorination. All added chlorine remain as residual chlorine.
After this, water is dechlorinated by SO2, sodium thiosulphate.
(1)
MEGHA MANJU said:
7 years ago
Yes, I agree. Dechlorination is done to remove the excess chlorine after the superchlorination.
(1)
Gajan Rana said:
8 years ago
Actually superchlorination is followed by Dechlorination.
(2)
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