Chlorination and Dechlorination in Potable Water Treatment. Urgent!?

Hi,

What are the methods in removing the chlorine residual in water? Issit activated carbon and heating? Or there are other method(s) in removing the chlorine content in water?

Is there any relevant website which is about the removal of chlorine in water?

Thanks.

Answer:
Well for a start, simple aeration will reduce the chlorine level. Ask anyone who has indoor fish and they will know that standing water overnight will lower the level of chlorine from tap water but unfortunately companies are sometimes using chloramine instead of or as well as chlorine for disinfection. Both chlorine and chloramine are toxic to fish - very toxic. Yes, heating will also release chlorine from tap water and activated carbon will remove chlorine and chlorinated substances but if you want to chemically remove chorine then you can treat with sodium thiosulphate.
Boiling and activated carbon are effective methods and even reverse osmosis may remove.
Sodium Bisulphite I believe. Activated carbon *will not* remove the chlorine effectively.

"Sodium Bisulfite:
Treatment of process water: Removal of excess chlorine, in special cases removal of oxygen" >>> http://www.inorganics.basf.com/p02/capor...

DECHLORINATION

To reduce effluent chlorine levels as required in the "Water Quality Standard and Policy for Chlorine in Surface Waters," the City of Martinsville uses a sodium bisulfite liquid feed system. Sodium bisulfite solution is a straw colored aqueous solution of sodium metabisulfite (H2SO3) that reduces excess residual chlorine. <<< http://www.ci.martinsville.va.us/water/w...

Also: http://www.wcponline.com/archivenewsview...

Hahahahaha! Keep the thumbs down coming!
Well here is what you do. First of all raise the pH of the soution you have to around 9 or 10. then add a reducing agent. The most common one used in industry is called sodium metabisulfite. This will neutralize all of the chlorine. You dont have to stop there however. Then lower the pH to 2 using sulfuric acid. Then raise the pH with sodium hydroxide to precipitate out the salts.You will end up with a nice clear solution without the chlorine

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