How Can Water Distribution Systems Be Kept Secure?
Steve Schear
schear at lvcm.com
Mon Oct 8 18:15:02 PDT 2001
At 04:30 PM 10/8/2001 -0700, mmotyka at lsil.com wrote:
>UV is actually a very good disinfectant. It works by damaging the
>DNA/RNA of bacteria and virii. There is evidence of some viruses being
>re-activated by sunlight. UV coupled with a primary disinfectant like Cl
>makes a pretty safe system. The 4ft GE Quartz UV bulbs are powerful. The
>water should be clear - turbid water attentuates the UV too much.
>
>In very poor places where many children die of dehydration because of
>contaminated water and where there is little or no money for water
>systems, aid workers have taught the kids to put water into clear
>plastic drink bottles ( the kind our landfills are clogged with ) and
>leave it in the sun. It works quite well.
>
>How are RO systems at removing microorganisms?
[From some consumer spec comparisons to a RO unit I use]
Types Of Drinking Water Appliances & Pollutants Removed
Pollutant Sediment Activated Reverse Distil- De-Ion- UV
Filter Carbon Osmosis ation ization
Sodium No No Yes Yes Yes No
Arsenic No No Yes Yes Yes No
Lead No No Yes Yes Yes No
Cadmium No No Yes Yes Yes No
Cysts No Some Yes Yes No Yes
(Crypotosporidium)
Sulfates No No Yes Yes Yes No
Calcium (Hardness) No No Yes Yes Yes No
Magnesium No No Yes Yes Yes No
(Hardness)
Phosphates No No Yes Yes Yes No
Chlorides No No Yes Yes Yes No
Florides No No Yes Yes Yes No
Alkalinity No No Yes Yes Yes No
Fecal Bacteria No Most Yes Yes No Yes
Viruses No No Yes Yes No Yes
Organics Yes Yes Yes Yes No No
Trialomethanes No Yes Yes No Yes No
Trichloroethlene No Yes Yes No Yes No
Ph
Factor No No Neutralizes Neutralizes Neutralizes
No
Radioactive No No Yes No No No
Contaminates
Chlorine No Yes Yes Most No No
Pesticides No Yes Yes Yes No No
Sediment Yes Most Yes Yes Yes No
Unpleasant No Yes Yes No Yes No
Taste/Odor
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