Fate of PCBs in Municipal-Sludge Amended Soilby P. Mac Berthouex, Univ of Wisconsin-Madison, Madison, United States,
D. Robert Gan, Univ of Wisconsin-Madison, Madison, United States,
Abstract: This paper presents the preliminary results of a five-year field study of the fate of PCBs in soil that has been amended with municipal sewage sludge. A first-order model describes the disappearance of PCB from the surface soil layer. The rate constants were not affected by PCB concentration of sludge or the soil, sludge loading rate, sludge application pattern, or interactions of these variables. Results show that most 2-, 3-, and 4-chlorinated PCB congeners disappear from the surface soil layer with the half-lives of 4 to 77 months. More highly chlorinated PCBs did not disappear from the soil. Plant data show no evidence of PCB uptake.
Subject Headings: PCB | Sludge | Sewage | Field tests | Local government | Layered soils | Terrain models | Concentrated loads
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