Anaerobic transformation of chlorophenols in methanogenic sludge unexposedto chlorophenols

Citation
R. Takeuchi et al., Anaerobic transformation of chlorophenols in methanogenic sludge unexposedto chlorophenols, CHEMOSPHERE, 41(9), 2000, pp. 1457-1462
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
CHEMOSPHERE
ISSN journal
0045-6535 → ACNP
Volume
41
Issue
9
Year of publication
2000
Pages
1457 - 1462
Database
ISI
SICI code
0045-6535(200011)41:9<1457:ATOCIM>2.0.ZU;2-Q
Abstract
Transformation of all 19 chlorophenol (CP) isomers was investigated in a la boratory anaerobic methanogenic sludge that had not been exposed to synthet ic chemicals. Concentration of CP was analyzed over time to calculate disap pearance rate constants using first-order reaction kinetics and all possibl e CP degradation pathways were estimated. The rate constants ranged between 0.46 x 10(-3) and 0.161 day(-1). CPs were transformed via dechlorination. The chlorine atom at the ortho-position was the most easily dechlorinated, whereas dechlorination rate at the para-position was lowest. The overall pa thways of CP transformation were much less diverse than that we previously found for contaminated sediment. The Dolfing hypothesis of microbial select ion of the most thermodynamically favorable pathways was not applicable for CP transformation in this study as well as previous study performed by our group. (C) 2000 Elsevier Science Ltd. All rights reserved.