Method of achieving microbiological control in open recirculatin

Details Method of achieving microbiological control in open recirculatin Method of achieving microbiological control in open recirculatin

1995-05-15

1997-02-18

Hruskoci, Peter A.

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

162161, 210701, 210754, 210760, 210764, 422 15, 422 16, C02F 176

Patent

active

056038402

ABSTRACT:
The invention comprises adding bromide to a cooling water system containing corrosion and scale control treatment chemicals at elevated concentrations (40 ppm or greater). A fraction of the recirculating water is drawn off in a side stream and ozonated. Ozone oxidizes bromide to bromine which then serves as a biocide. The bromide levels are chosen such that the ozone/bromide reaction is preferred over the ozone/treatment chemicals reaction. Thus, the addition of bromide at elevated concentrations, while acting as a biocide precursor, serves to protect treatment chemicals necessary for corrosion and scale control.

REFERENCES:
patent: 5171451 (1992-12-01), Khambatta et al.
patent: 5259985 (1993-11-01), Nakanishi et al.
patent: 5264136 (1993-11-01), Howarth et al.
patent: 5415783 (1995-05-01), Johnson et al.
R. G., J. F. Wilkes, "Bromide Ion--Its Possible biocidal Role with Ozone in cooling Water Treatment", Industrial Water Treatment, 24, 1992, pp. 40-48.

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