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.
Biodegradation
; 10(4): 271-8, 1999.
Article
em En
| MEDLINE
| ID: mdl-10633543
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 both enantiomers 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.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Esgotos
/
Ácido 2-Metil-4-clorofenoxiacético
/
Ácido 2,4-Diclorofenoxiacético
/
Herbicidas
Idioma:
En
Revista:
Biodegradation
Assunto da revista:
BIOQUIMICA
/
SAUDE AMBIENTAL
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
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