Process for removing scale, and reducing scale formation in sewa

Details Process for removing scale, and reducing scale formation in sewa Process for removing scale, and reducing scale formation in sewa

1993-02-22

1994-10-04

Hruskoch, Peter A.

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

134 3, 134 2214, 134 2219, 134 41, 210631, 210700, 210701, 252 82, 252180, 252181, C02F 514

Patent

active

053523652

ABSTRACT:
Scale is removed, and its formation is reduced or prevented in the effluent section of a sewage treatment plant, by adding a solution containing a small amount of phosphonate and a terpolymer of acrylic acid. The treatment is especially effective in anaerobic areas of the plant, which includes transfer lines from sludge handling systems, pumps, piping, valves, overflow lines, and possibly centrifuges, etc., and particularly where the Ca+ 2 exceeds about 600 ppm, and the system alkalinity varies from about pH 6-9.

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"Advances In Understanding Struvite Formation And Possible Methods Of Control"; by Robert McNabb; The Bulletin, Winter 1991; printed by The California Water Pollution Control Association.
"Characterizing The Dispersing Polymers For Water Treatment"; by William M. Hann, Judy H. Bardsley, and S. Tabb Robertson, published by Rohm and Haas, Mar. 1990.
"Acumer Water Treatment Polymers"; published by Rohm and Haas Company, Mar. 1991.
"Dequest 2010 Organophosphorus Product For Scale Prevention & Corrosion Inhibition In Water Treatment"; Technical Bulletin IC/SCS-313; published by Monsanto Dec. 1971.
"New Acrylate Polymers For Water Treatment Programs"; by Michael J. Ellis, William M. Hann, and Judy H. Bardsley; Resin Review 1987; vol. XXXVII No. 3, pp. 2-19.

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