The interactive biotic and abiotic processes of DDT transformation under dissimilatory iron-reducing conditions
Publication Date
2015-11-30Author
Jin, Xin
Wang, Fang
Gu, Chenggang
Yang, Xinglun
Kengara, Fredrick O
Bian, Yongrong
Song, Yang
Jiang, Xin
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Abstract The objective of the study was to elucidate the biotic and abiotic processes under
dissimilatory iron reducing conditions involved in reductive dechlorination and iron
reduction. DDT transformation was investigated in cultures of Shewanella putrefaciens 200
with/without α-FeOOH. A modified first-order kinetics model was developed and described
DDT transformation well. Both the α-FeOOH reduction rate and the dechlorination rate of
DDT were positively correlated to the biomass. Addition of α-FeOOH enhanced reductive
dechlorination of DDT by favoring the cell survival and generating Fe II which was absorbed
on the surface of bacteria and iron oxide. 92% of the absorbed Fe II was Na-acetate (1 M)
extractable. However, α-FeOOH also played a negative role of competing for electrons as
reflected by the dechlorination rate of DDT was inhibited when increasing the α-FeOOH …
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- Department of Chemistry [326]