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ANAEROBIC BIODEGRADATION OF DDT RESIDUES (DDT, DDD, AND DDE) IN ESTUARINE SEDIMENT

2001; Taylor & Francis; Volume: 36; Issue: 3 Linguagem: Inglês

10.1081/pfc-100103569

1532-4109

Hui-Jung Huang, Shiu‐Mei Liu, Cham-En Kuo,

Environmental remediation with nanomaterials

Abstract The potential for anaerobic biodegradation of 1,1,1-trichloro-2,2-bischlorophenylethane (DDT), 1,1-dichloro-2,2,-bischlorophenylethane (DDD), and dichlorodiphenylchloroethylene (DDE) in anoxic sediment slurries collected from the Keelung River was investigated in this study. o,p′- and p,p'-DDT were dechlorinated to o,p'- and p,p'-DDD, respectively, and then transformed to other compound(s). 1-Chloro-2,2-bis (p-chlorophenyl) ethylene (DDMU) and trace amount of dichlorobenzophenone (DBP) were detected in sediment slurries amended with p,p'-DDT or p,p'-DDD. DDMU was also detected in sediment slurries amended with p,p'-DDE. The relative transformation rates for both o,p'- and p,p'-isomers of DDT, DDD, and DDE were DDT>DDD>DDE. Re-addition of DDT, DDD, or DDE to the sediment slurries after initial removal enhanced the respective dechlorination rates. The transformation rates of the p,p'-isomers of both DDT and DDD were faster than those of the respective o,p'-isomers. p,p'-DDT dechlorination in the p,p'-DDT-adapted sediment slurries were inhibited by the addition of molybdate, or molybdate plus sulfate, but not inhibited by the addition of sulfate. Addition of bromoethanesulfonic acid (BESA) slightly inhibited p,p'-DDT dechlorination. Non-adapted sediment slurries lost the ability to dechlorinate pentachlorophenol during adaptation to p,p'-DDT. p,p'-DDD was the major transformation product of p,p'-DDT in 3,4,4′,5-tetrachlorobiphenyl-adapted sediment slurries, which suggested that the microbial community in the 3,4,4′,5-CB-adapted sediment was unable to remove chlorine from the aromatic rings of p,p'-DDT. Keywords: BiodegradationDDTDDDDDEEstuarine sediment ACKNOWLEDGMENT This work was supported in part by the National Science Council of Taiwan (NSC 86-2313-B-019-026).