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Fate of the herbicides mecoprop, dichlorprop, and 2,4-D in aerobic and anaerobic sewage sludge as determined by laboratory batch studies and enantiomer-specific analysis

Fate of the herbicides mecoprop, dichlorprop, and 2,4-D in aerobic and anaerobic sewage sludge as determined by laboratory batch studies and enantiomer-specific analysis

Authors :
Muller, Markus D.
Angst, Werner
Zipper, Christian
Fleischmann, Thomas
Kohler, Hans-Peter E.
Bolliger, Christof
Suter, MarcJ.-F.
Source :
Biodegradation; 1999, Vol. 10 Issue 4, p271, 0p
Publication Year :
1999

Abstract

Aerobic degradation experiments with the racemic mixtures of mecoprop and dichlorprop revealed that activated sludge collected from the aeration tank of a municipal waste water treatment plant degraded bothenantiomers of mecoprop and dichlorprop within 7 days, albeit in an enantioselective manner; the (S) enantiomers were preferentially degraded. Mecoprop, dichlorprop, and 2,4-D were completely metabolized under aerobic conditions, as shown by the 86-98% elimination of dissolved organic carbon. Under anaerobic conditions, the concentration of 2,4-D decreased exponentially with a first-order reaction rate constant of 0.24 per day and without a lag-phase. After an incubation time of 17 days, 2,4-D was completely removed. 2,4-Dichlorophenol was the main metabolite of anaerobic 2,4-D degradation; only traces of 4-chlorophenol were detected. In contrast, the chiral phenoxypropionic acid herbicides mecoprop and dichlorprop persisted under anaerobic conditions during 49 days of incubation. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09239820
Volume :
10
Issue :
4
Database :
Complementary Index
Journal :
Biodegradation
Publication Type :
Academic Journal
Accession number :
8406917
Full Text :
https://doi.org/10.1023/a:1008396022622