Disinfection by-products removal in water purification

Details Disinfection by-products removal in water purification Disinfection by-products removal in water purification

1991-03-11

1992-10-13

Silverman, Stanley S.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210679, 210694, 210715, 210735, 210908, C02F 128, C02F 156

Patent

active

051548348

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.

REFERENCES:
patent: 4549966 (1985-10-01), Beall
patent: 4661259 (1987-04-01), Walterick, Jr. et al.
patent: 4737293 (1988-04-01), Walterick, Jr. et al.
patent: 4765908 (1988-08-01), Monick et al.

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