Transport and degradation of pesticides in a biopurification system under variable flux, Part I: a microcosm study.
The efficiency of a biopurification system, developed to treat pesticide contaminated water, is to a large extent determined by the chemical and hydraulic load. Insight into the behaviour of pesticides under different fluxes is necessary. The behaviour of metalaxyl, bentazone, linuron, isoproturon and metamitron was studied under three different fluxes with or without the presence of pesticide-primed soil in column experiments. Due to the time-dependent sorption process, retention of the pesticides with intermediate mobility was significantly influenced by the flux. The higher the flux, the slower pesticides will be sorbed, which resulted in a lower retention. Degradation of the intermediate mobile pesticides was also submissive to variations in flux. An increase in flux, led to a decrease in retention, which in turn decreased the opportunity time for biodegradation. Finally, the presence of pesticide-primed soil was only beneficial for the degradation of metalaxyl.
De Wilde
Tineke
T
Laboratory of Crop Protection Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium. dewilde.tineke@gmail.com
Spanoghe
Pieter
P
Ryckeboer
Jaak
J
Jaeken
Peter
P
Springael
Dirk
D
D000042:Absorption; D000327:Adsorption; D000409:Alanine / Q000031:analogs & derivatives / Q000032:analysis / Q000378:metabolism; D001581:Benzothiadiazines / Q000032:analysis / Q000378:metabolism; D001673:Biodegradation, Environmental; D005618:Fresh Water / Q000737:chemistry; D008044:Linuron / Q000032:analysis / Q000378:metabolism; D010575:Pesticides / Q000032:analysis* / Q000378:metabolism; D010671:Phenylurea Compounds / Q000032:analysis / Q000378:metabolism; D012987:Soil / Q000737:chemistry; D014227:Triazines / Q000032:analysis / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism; D018508:Water Purification / Q000379:methods*
D001581:Benzothiadiazines; D010575:Pesticides; D010671:Phenylurea Compounds; D012987:Soil; D014227:Triazines; D014874:Water Pollutants, Chemical; D008044:Linuron; C028175:metalaxyl; C028904:isoproturon; C047758:metamitron; D000409:Alanine; C002003:bentazone