Disinfection by-products removal in water purification
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United States of America Patent
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Oct 13, 1992
Grant Date -
N/A
app pub date -
Mar 11, 1991
filing date -
Mar 11, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Improved methods for removal of disinfection by-products, halomethanes, precursors thereof and other organic contaminants from water being processed for use as potable or industrial water involve adding to the water being treated in a zone separate from the conventional clarification, softening and filtration steps, and downstream of at least the clarification step, between about 1 to 1000 ppm of powdered activated carbon (PAC), between about 1 to 1000 ppm of bentonite and between about 0.1 to 100 ppm of flocculant polymer, based upon one million parts of the water. The relative proportions of PAC, bentonite and polymer within the stated ranges are selected to give a sludge having a sludge cohesion factor 'k' between about 0.5 and 5, especially between 0.6 and 1.5.
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