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Author Topic: Drinking water disinfection  (Read 1962 times)

tditsabatho

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Drinking water disinfection
« on: May 14, 2013, 09:55:30 am »
My company, a large water supply authority is planing to use Bromochlorodimethylhydantoin (BCDMH) tablets for the disinfection of its public drinking water supplies. What are the health risks of using this technique and where has it been implemeted?

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Drinking water disinfection
« on: May 14, 2013, 09:55:30 am »

Jacuzzi Jim

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Re: Drinking water disinfection
« Reply #1 on: May 14, 2013, 11:01:29 am »
 It will probably taste like chlorine.   What did they use before?

chem geek

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Re: Drinking water disinfection
« Reply #2 on: May 14, 2013, 04:15:21 pm »
You do not normally want to use bromine in disinfecting drinking water.  In general, the brominated disinfection by-products are more harmful (more cancer-causing) than the chlorinated ones.  For example, the brominated trihalomethanes (THMs) are all cancer-causing, but the solely chlorinated one, chloroform, is not except at very high cytotoxic levels.  Also, use of BCDMH tabs will have leftover DMH (5,5-Dimethylhydantoin).

Most municipal water supply districts use chlorine for disinfection, usually from sodium hypochlorite (chlorinating liquid or bleach).  Before you chlorinate, you want to remove as much dissolved organic matter as possible, usually through a combination of sedimentation (i.e. let still water settle), flocculation (adding chemicals to coagulate and settle), filtration (removal of insoluble compounds).  Then after chlorination, many water districts add ammonia to form monochloramine when sending the water out into the lines.  Monochloramine will last longer and produce fewer disinfection by-products in the lines on its way to homes and businesses.

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Re: Drinking water disinfection
« Reply #2 on: May 14, 2013, 04:15:21 pm »

 

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