Pesticide removal from waste spray-tank water by organoclay adsorption after field application to vineyards

摘要

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, penco-nazole 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.