Alkali degradation of PCB congeners in sewage sludge
This article concerns research into the alkaline saponification of sewage sludge which may lead to the degradation of polychlorinated biphenyls (PCB) with five or more chloro-substituents, hexachlorobenzene (HCB) and dichlorodiphenyls (DDE). Refluxing sewage sludge with 2N KOH in methanol for 6 hours did not cause degradation at 50 C, and reduced the concentration of heptachlorobiphenyls to decachlorobiphenyls to approximately 50% at 70 C, and even more at 90 C. Refluxing with 4N KOH in methanol for 6 hours efficiently eliminated heptachlorobiphenyls to decachlorobiphenyls, reduced hexachlorobiphenyls to around 50% and pentachlorobiphenyls to around 30%. HCB was degraded faster than PCBs, whereas DDE was similar to pentachlorobiphenyls.
Bibliographic Reference: Article: Fresenius Environmental Bulletin (1997)
Record Number: 199711033 / Last updated on: 1997-09-16
Original language: en
Available languages: en