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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
- 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]
- Subjects :
- HERBICIDES
SEWAGE sludge
BIODEGRADATION
Subjects
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