PURPOSE: The main objective of this work was to develop and test a pilot scheme for decontaminating pesticide-containing water derived from pesticide mixtures used to protect vineyards, in which the scheme comprises adsorption by an organoclay and includes a system where an enhanced or rapid microbial degradation of the adsorbed residues can occur. METHODS: In laboratory experiments, the Freundlich adsorption coefficients of formulations of two fungicides, penconazole and cyazofamid, onto the organoclay Cloisite 20 A were measured in order to predict the efficiency of this organoclay in removing these fungicides from the waste spray-tank water. Subsequently, the adsorption tests were repeated in the pilot system in order to test the practical operation of the depuration scheme. RESULTS: The adsorption tests with the pilot system show 96% removal of both fungicides over a few hours, similar to the efficiency of removal predicted from the laboratory adsorption tests. The formulation type may influence the efficiency of clay recovered after adsorption. Regarding the waste disposal, for instance, the organoclay composted after the treatment, cyazofamid showed significant dissipation after 90 days, whereas the dissipation of penconazole was negligible. CONCLUSION: The depuration scheme developed showed to be efficient for decontaminating pesticide-containing water derived from vineyards, but additional treatments for the adsorbed residues still appear to be necessary for persistent pesticides. However, future decontamination research should be attempted for water contaminated with pesticides containing antifoaming agents in their formulations, in which case the present pilot system could not be applied.
PURPOSE: The main objective of this work was to develop and test a pilot scheme for decontaminating pesticide-containing water derived from pesticide mixtures used to protect vineyards, in which the scheme comprises adsorption by an organoclay and includes a system where an enhanced or rapid microbial degradation of the adsorbed residues can occur. METHODS: In laboratory experiments, the Freundlich adsorption coefficients of formulations of two fungicides, penconazole and cyazofamid, onto the organoclay Cloisite 20 A were measured in order to predict the efficiency of this organoclay in removing these fungicides from the waste spray-tank water. Subsequently, the adsorption tests were repeated in the pilot system in order to test the practical operation of the depuration scheme. RESULTS: The adsorption tests with the pilot system show 96% removal of both fungicides over a few hours, similar to the efficiency of removal predicted from the laboratory adsorption tests. The formulation type may influence the efficiency of clay recovered after adsorption. Regarding the waste disposal, for instance, the organoclay composted after the treatment, cyazofamid showed significant dissipation after 90 days, whereas the dissipation of penconazole was negligible. CONCLUSION: The depuration scheme developed showed to be efficient for decontaminating pesticide-containing water derived from vineyards, but additional treatments for the adsorbed residues still appear to be necessary for persistent pesticides. However, future decontamination research should be attempted for water contaminated with pesticides containing antifoaming agents in their formulations, in which case the present pilot system could not be applied.
Authors: Tineke De Wilde; Ettore Capri; Jens Husby; Maria del Pilar Castillo; Dimitrios Karpouzas; Eskil Nilsson; Niels Henrik Spliid Journal: Environ Sci Pollut Res Int Date: 2010-10-23 Impact factor: 4.223
Authors: Tineke De Wilde; Pieter Spanoghe; Jan Mertens; Kristel Sniegowksi; Jaak Ryckeboer; Peter Jaeken; Dirk Springael Journal: Environ Pollut Date: 2009-01-13 Impact factor: 8.071
Authors: Thomas Kupper; Thomas D Bucheli; Rahel C Brändli; Didier Ortelli; Patrick Edder Journal: Bioresour Technol Date: 2008-05-01 Impact factor: 9.642
Authors: Nicoleta A Suciu; Tommaso Ferrari; Federico Ferrari; Marco Trevisan; Ettore Capri Journal: Environ Sci Pollut Res Int Date: 2011-11-06 Impact factor: 4.223
Authors: Marie Lefrancq; Sylvain Payraudeau; Antonio Joaquín García Verdú; Elodie Maillard; Maurice Millet; Gwenaël Imfeld Journal: Environ Sci Pollut Res Int Date: 2013-06-27 Impact factor: 4.223