Published by Mohammed Abd Elsalam, WASH Consultant-UNICEF in Academic
If I add chlorine gas to the water at a dose that exceeds the required rate, how do I treat the water to decrease the concentration of chlorine in water?
What are the efficient methods of mitigating the chlorine gas overdose?
Category: Academic
If this is drinking water I would use caution in using chemicals as this would create byproducts. A safe way to decrease the chlorine in the water is by aeration.
Published by Samuel DeGuzman, Water Treatment Plant Supervisor
If it is drinking water aeration will be not very effective and will allow contamination of water that has been disinfected
Published by Steve Oxtoby, Process Engineer
So2 or aeration on the acid side will do it depending on the overdose. All methods have drawbacks of their own.
Published by Henry Boyter
You can dose sodium meta bisulphite (SMBS). It is used upstream of RO membranes to destroy any remaining free chlorine that can otherwise damage RO membranes.
Published by Louis Koen, Zutari - Technical Director
How much of an over dose? If not much just let it go. Or, you could add some sulfur dioxide to reduce some of it. You could allow some chlorine to purge off if the excess does not react with the remaining TOC quickly. You could add some ammonia to reduce the free chlorine while retaining distribution system residual.
Published by Joseph Cotruvo, President at Joseph Cotruvo & Associates, Water , Environment and Public Health
Add sulphur dioxide in the ratio 0.9 SO2 : 1.0 Cl2 for each mg/l chlorine you wish to remove.
Published by Frank Price, Security Professional (MSO), Part Time, at Allied Universal Security
Dilute with more water
Published by Terin Sinclair
sodium thiosulfate will decrease the chlorine concentration. use sparingly because sodium thiosulfate is a chlorine quenching agent.
Published by Steve Byg, CWP, Certified Water Professional - Water Quality Chemist at Ixom Watercare
You don't need to do anything as demand for chlorine in the water is so high that it would get consumed. The only issues would be higher corrosion of your pipes and heavy taste of chlorine in the water that consumers may detest.
Published by Chetan Shukla, Clean Environmental Technologies Pvt. Ltd. - Director
It distribution network or house service connections are leaky and prone to contamination, better to be patient with excess chlorine so by the time the water reaches the point of use, the residual will be about 0.3 ppm. Still if there is need to reduce Cl2, simply choose aeration or activated carbon filter.
Published by gonuguntla kondala rao, Andhra Pradesh Urban Finance and Infrastructure Development Corporation Ltd. - Chief Engineer