Transport and degradation of pesticides in a biopurification system under variable flux, part I: A microcosm study |
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Authors: | Tineke De Wilde Pieter Spanoghe Peter Jaeken Dirk Springael |
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Affiliation: | a Laboratory of Crop Protection Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium b Division Soil and Water Management, Faculty of Bioscience Engineering, Catholic University Leuven, Kasteelpark Arenberg 20, B-3001 Leuven, Belgium c PCF-Royal Research Station of Gorsem, De Brede Akker 13, 3800 Sint-Truiden, Belgium |
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Abstract: | 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. |
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Keywords: | Biopurification system Flux Pesticide Sorption Degradation Transport |
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