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Treatment of Wool Scouring Wastes with Colloidal Bentonite

Fong, W., Lundgren, H.P.
Textile research journal 1955 v.25 no.12 pp. 994-1000
additives, bentonite, chemical oxygen demand, coagulants, cracking, fabrics, pH, sulfuric acid, textile fibers, wastes, wool
Results are presented of a laboratory-scale study to determine the effectiveness of various coagulants as supplementary additives in the conventional acid cracking of wool scouring wastes. It was observed that a dispersible-type bentonite produces a marked improvement in the extent of clarification of the waste effluent. In brief, the treatment involves first acidifying the scouring wastes with sulfuric acid to a pH level between 3 and 4 and then adding the required amount of bentonite as an aqueous dispersion. The amount of bentonite required depends upon the grease and suint content of the waste. A bentonite concentration of between 0.1 and 0.5% is generally sufficient. As an ex ample, treatment of a standard waste with acid and bentonite removed as much as 96% of the grease, compared with removal of 67% with acid alone. The chemical oxygen demand was reduced by approximately 60% by the combination treatment, compared with 33% reduction with acid alone.