The use of aluminium salts to remove suspended solids and a proportion of the soluble material from slaughterhouse effluents was examined. Acidification prior to the addition of 40 mg/1 aluminium is recommended so that the final pH is approximately 5.0. Removal efficiency is greatest at a pH just above the average isoelectric point of the effluent proteins.
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Russell et al. (1981) studied this question.
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