METHOD OF PREVENTING SCALE FORMATION OF HEAT-EXCHANGE SURFACES Russian patent published in 1998 - IPC

FIELD: water treatment. SUBSTANCE: anode destruction rate is decreased and its lifetime is therefore prolonged, while high efficiency of equipment scale-control retained, by passing recycle water, prior to be fed into heat exchanger, through following electrode system: graphite anode pretreated with solution of water- resistant polymer material in organic solvent and cathode connected to constant power source. Current density on anode is 12-50 A/sq. m, on cathode 4-15 A/sq.m, and hydraulic load on electrodes is 50-120 cu. m/sq. m hr. Above-mentioned recycle water is biologically treated waste water, above water-resistant polymer material is epoxy resin or fluoroplastic, and acetone is used as organic solvent. EFFECT: increased productivity and disinfection efficiency of process. 3 cl, 1 tbl