Anaerobic biodegradability of mixtures of pesticides in an expanded granular sludge bed reactor

Monsalvo V.M., Garcia-Mancha N., Puyol D., Mohedano A.F. and Rodriguez J.J. (2014) Anaerobic biodegradability of mixtures of pesticides in an expanded granular sludge bed reactor. Water Science and Technology, 69 3: 532-538. doi:10.2166/wst.2013.739

Author Monsalvo V.M.
Garcia-Mancha N.
Puyol D.
Mohedano A.F.
Rodriguez J.J.
Title Anaerobic biodegradability of mixtures of pesticides in an expanded granular sludge bed reactor
Journal name Water Science and Technology   Check publisher's open access policy
ISSN 0273-1223
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.2166/wst.2013.739
Open Access Status Not yet assessed
Volume 69
Issue 3
Start page 532
End page 538
Total pages 7
Place of publication London United Kingdom
Publisher IWA Publishing
Language eng
Formatted abstract
The biodegradability and toxicity of three commercial pesticides containing 2-methyl-4-chlorophenoxyacetic acid (MCPA), imidacloprid and dimethoate were evaluated individually, and a complex mixture of these pesticides was treated in an expanded granular sludge bed (EGSB) reactor. MCPA was partially biodegraded, while imidacloprid and dimethoate remained almost unaltered during the individual biodegradability tests. Cyclohexanone was identified as the major solvent in the dimethoate-bearing insecticide, which was completely removed regardless of the presence of other pesticides. The analysis of the inhibition over the acetoclastic methanogenesis showed IC50 (half maximal inhibitory concentration) values of 474 and 367 mg/L for imidacloprid and dimethoate, respectively. The effect on the methanogenesis was negligible in the case of MCPA and cyclohexanone. Pesticides caused a dramatic decrease of the EGSB reactor performance. After 30 d acclimation, the EGSB reactor achieved a stable chemical oxygen demand (COD) removal efficiency and methane production of around 85% and 0.9 g CH4-COD/g COD, respectively, for MCPA, imidacloprid, dimethoate and cyclohexanone feed concentrations of 57, 20, 25 and 27 mg/L, respectively. The presence of complex pesticide mixtures led to synergistic/antagonistic responses, reducing the MCPA biodegradation and improving the removal of the insecticides' active ingredients, which were completely removed in the EGSB reactor.
Keyword Cyclohexanone
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
Advanced Water Management Centre Publications
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