[The behavior of polychlorinated biphenyls (PCB) in a water purification plant. II. A mathematical balancing of the Ruhleben purification plant in Berlin].

Studies on PCB concentration and their distribution in waste water sludge of a municipal sewage plant are made. The incoming sewage has an average concentration of 813 ng/l, the effluent still contains 108 ng/l. The biggest part of the PCB is accumulated in the sludge. A comparison of the in- and output of PCB and the average PCB-patterns at the various sampling sites of the sewage plant shows that the PCB are not transformed or decomposed microbially.