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Hydrogen
sulfide is a gas present in some waters. There is never
any doubt as to when it present due to its offensive
"rotten egg" odor apparent in concentrations
as low as 1ppm.
Hydrogen
Sulfide Removal
There are
several methods for removing hydrogen sulfide from
water. Most of them involve converting the gas into
elemental sulfur. This insoluble yellow powder can then
be removed by filtration.
Low to
moderate concentrations of hydrogen sulfide can be
eliminated through use of an oxidizing filter of the
same type for iron removal. Because the elemental sulfur
precipitate tends to clog the filter material, it is
usually necessary to replace this material from time to
time.
Chemical
treatment is recommended for medium to high
concentrations of hydrogen sulfide. In such cases
solutions of household bleach or potassium serve as
satisfactory oxidizing agents.
An
activated carbon filter alone will remove trace amounts
of hydrogen sulfide. In this process the carbon simply
absorbs the gas on its surface areas. The use of an
activated carbon filter can be economical when extremely
small amounts of the gas are present.
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