Transport and degradation of pesticides in a biopurification system under variable flux Part II: A macrocosm study.
Transport of bentazone, isoproturon, linuron, metamitron and metalaxyl were studied under three different flows in macrocosms. The aim was to verify the observations from Part I of the accompanying paper, with an increase in column volume and decrease in chemical and hydraulic load. Very limited breakthrough occurred in the macrocosms for all pesticides, except bentazone, at all flows. From batch degradation experiments, it was observed that the lag time of metamitron and linuron decreased drastically in time for all flows, indicating a growth in the pesticide degrading population. This in contrast to isoproturon and metalaxyl, where an increase in lag time could be observed in time for all flows. From the batch degradation experiments, it could be concluded that the influence of flow on the lag time was minimal and that the inoculation of the pesticide-primed soil had a little surplus value on degradation.
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; D001965:Bromides / Q000032:analysis / Q000378:metabolism; 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; D001965:Bromides; 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