Abstract
The influence of sewage sludge conditioning and dewatering processes on the distribution of polychlorinated biphenyls (PCBs) and organochlorine insecticides (OCLs) in sewage sludges has been investigated at two sewage treatment works—one employing coagulation of primary digested sludge with aluminium chlorohydrate followed by dewatering using vacuum filtration, the other using conditioning of consolidated mixed primary sludge with Zetag 94S, an organic polyelectrolyte, and subsequent dewatering by pressure filtration. It has been demonstrated that analytical methods developed for the determination of these micropollutants in sewage sludges are not subject to interference from the dewatering chemicals and are therefore suitable for the analysis of conditioned sludges. A mass balance of solids and organic micropollutants through the two treatment processes has been constructed and the results indicate a close association of polychlorinated biphenyls and organochlorine insecticides with the solid matter in sewage sludges. The occurrence of polychlorinated biphenyls and organochlorine insecticides in sewage sludges and the possible environmental effects of contaminated sludge disposal are discussed.
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