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Characterizing pesticide sorption and degradation in microscale biopurification systems using column displacement experiments |
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| Authors: | De Wilde Tineke Mertens Jan Simunek Jirka Sniegowksi Kristel Ryckeboer Jaak Jaeken Peter Springael Dirk Spanoghe Pieter |
| Institution: | 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, K.U. Leuven, Kasteelpark Arenberg 20, B-3001 Heverlee, Belgium c Department of Environmental Sciences, University of California, Riverside, CA, USA d PCF-Royal Research Station of Gorsem, De Brede Akker 13, 3800 Sint-Truiden, Belgium |
| Abstract: | Biopurification systems treating pesticide contaminated water are very efficient, however they operate as a black box. Processes inside the system are not yet characterized. To optimize the performance, knowledge of degradation and retention processes needs to be generated. Therefore, displacement experiments were carried out for four pesticides (isoproturon, bentazone, metalaxyl, linuron) in columns containing different organic mixtures. Bromide, isoproturon and bentazone breakthrough curves (BTCs) were well described using the convection-dispersion equation (CDE) and a first-order degradation kinetic approach. Metalaxyl and linuron BTCs were well described using the CDE model expanded with Monod-type kinetics. Freundlich sorption, first-order degradation and Monod kinetics coefficients were fitted to the BTCs. Fitted values of the distribution coefficient Kf,column were much lower than those determined from batch experiments. Based on mobility, pesticides were ranked as: bentazone > metalaxyl - isoproturon > linuron. Based on degradability, pesticides were ranked as: linuron > metalaxyl - isoproturon > bentazone. |
| Keywords: | Pesticide HYDRUS-1D Breakthrough curve Degradation Monod kinetic |
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