期刊
ENVIRONMENTAL POLLUTION
卷 158, 期 3, 页码 770-777出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.10.010
关键词
Polychlorinated biphenyl; Soil bioremediation; Activated carbon; Bioavailability
资金
- Ministry of Moscow region
- RFBR [01-05-97006, 04-05-97203]
- University of Nebraska-Lincoln Institute of Agriculture and Natural Resources [NEB-38-069]
Activated carbon (AC) can help overcome toxicity of pollutants to microbes and facilitate soil bioremediation. We used this approach to treat a Histosol and an Alluvial soil historically contaminated with PCB (4190 and 1585 mg kg(-1), respectively, primarily tri-, tetra- and pentachlorinated congeners). Results confirmed PCB persistence, reductions in PCB extractable from control and AC-amended soils were mostly due to a decrease in tri- and to some extent tetrachlorinated congeners as well as formation of a bound fraction Mechanisms of PCB binding by soil and AC were different In addition to microbial degradation of less chlorinated congeners, we postulate AC catalyzed dechlorination of higher chlorinated congeners. A large decrease in bioavailable PCB in AC-amended soils was demonstrated by greater clover germination and biomass Phytotoxicity was low in treated soils but remained high in untreated soils for the duration of a 39-month experiment These observations indicate the utility of AC for remediation of soils historically contaminated with PCB. (C) 2009 Elsevier Ltd All rights reserved.
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