Transformation of carbon tetrachloride under sulfate reducing conditions

被引:17
|
作者
de Best, JH
Salminen, E
Doddema, HJ
Janssen, DB
Harder, W
机构
[1] Univ Groningen, Dept Biochem, NL-9747 AG Groningen, Netherlands
[2] TNO, Dept Environm Biotechnol, Environm Technol & Proc Engn Div, NL-7300 AH Apeldoorn, Netherlands
关键词
anaerobic biotransformation; carbon tetrachloride; electron donor; sulfate reduction; transformation products; toxicity;
D O I
10.1023/A:1008262225760
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The removal of carbon tetrachloride under sulfate reducing conditions was studied in an anaerobic packed-bed reactor. Carbon tetrachloride, up to a concentration of 30 mu M, was completely converted. Chloroform and dichloromethane were the main transformation products, but part of the carbon tetrachloride was also completely dechlorinated to unknown products. Gram-positive sulfate-reducing bacteria were involved in the reductive dechlorination of carbon tetrachloride to chloroform and dichloromethane since both molybdate, an inhibitor of sulfate reduction, and vancomycin, an inhibitor of gram-positive bacteria completely inhibited carbon tetrachloride transformation. Carbon tetrachloride transformation by these bacteria was a cometabolic process and depended on the input of an electron donor and electron acceptor (sulfate). The rate of carbon tetrachloride transformation by sulfate reducing bacteria depended on the type of electron donor present. A transformation rate of 5.1 nmol.ml(-1).h(-1) was found with ethanol as electron donor. At carbon tetrachloride concentrations higher than 18 mu M, sulfate reduction and reductive dechlorination of carbon tetrachloride decreased and complete inhibition was observed at a carbon tetrachloride concentration of 56.6 mu M. It is not clear what type of microorganisms were involved in the observed partial complete dechlorination of carbon tetrachloride. Sulfate reducing bacteria probably did not play a role since inhibition of these bacteria with molybdate had no effect on the complete dechlorination of carbon tetrachloride.
引用
收藏
页码:429 / 436
页数:8
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