Abstract
Because of environmental concerns about chlorinated organic compounds and chloroform in kraft mill effluent, new technologies of kraft pulp bleaching was studied and come into practical use.New ways of bleaching are ECF and TCF bleaching. ECF bleaching does not use both elemental chlorine and hypochlorite, and TCF bleaching does not use chlorine compound at all. In Japan, converting to ECF bleaching is general.Basically, scale deposit problems often occur in beaching plant. Along with the conversion to ECF bleaching, the tendency of scale deposit formation greatly changes.In this report, we show characteristics and control methods of scale deposit in ECF bleaching.
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