Bentonite an overview ScienceDirect TopicsBentonite is equally useful as a flocculation aid in the treatment of effluent from pulp and paper mills being effective in the removal from these effluents of starch Gillespie et al 1970 ammonium based spent sulphite liquor Scherler 1972 basic dyes Mobius and Gunther 1974 and colour and fines generally Potskhershvili et al 1977 Ciba Geigy 1978 Delaine 1978 These