title: Characterizing pesticide sorption and degradation in macro scale biopurification systems using column displacement experiments.
abstract: The efficiency of biopurification systems to treat pesticide-contaminated water was previously studied in microcosms. To validate the obtained results, macrocosm systems were set-up. Four pesticides (linuron, isoproturon, bentazone, and metalaxyl) were continuously applied to ten different organic substrate mixes. Retention of the pesticides was similar and in some cases slightly lower in the macrocosms compared to the microcosms. Differences in retention between the different mixes were however minimal. Moreover, the classification of the retention strength of the pesticides was identical to that observed in microcosms: linuron>isoproturon>metalaxyl>bentazone. Monod kinetics were used to describe delayed degradation, which occurred for isoproturon, metalaxyl and bentazone. No breakthrough of linuron was observed, thus, this pesticide was appointed as the most retained and/or degraded pesticide, followed by isoproturon, metalaxyl and bentazone. Finally, most of the matrix mixes efficient in degrading or retaining pesticides were mixes containing dried cow manure.
authors.affiliation: Faculty of Bioscience Engineering, Laboratory of Crop Protection Chemistry, Ghent University, Ghent, Belgium.
authors.forename: Tineke
authors.initials: T
authors.lastname: De Wilde
authors.forename: Pieter
authors.initials: P
authors.lastname: Spanoghe
authors.forename: Jan
authors.initials: J
authors.lastname: Mertens
authors.forename: Kristel
authors.initials: K
authors.lastname: Sniegowksi
authors.forename: Jaak
authors.initials: J
authors.lastname: Ryckeboer
authors.forename: Peter
authors.initials: P
authors.lastname: Jaeken
authors.forename: Dirk
authors.initials: D
authors.lastname: Springael
mesh_terms: D000327:Adsorption; D000409:Alanine / Q000031:analogs & derivatives; D001581:Benzothiadiazines; D001673:Biodegradation, Environmental; D006812:Humic Substances; D008044:Linuron; D010575:Pesticides; D010671:Phenylurea Compounds; D012987:Soil; D012988:Soil Microbiology; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods*
chemical_list: D001581:Benzothiadiazines; D006812:Humic Substances; D010575:Pesticides; D010671:Phenylurea Compounds; D012987:Soil; D014874:Water Pollutants, Chemical; D008044:Linuron; C028175:metalaxyl; C028904:isoproturon; D000409:Alanine; C002003:bentazone