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TECHNICAL REPORTS

Bioremediation and Biodegradation

Use of a Low-Cost Biosorbent to Remove Pesticides from Wastewater

^a GRECI (Groupe de Recherche en Chimie Inorganique), Université de Reims Champagne-Ardenne, BP 1039, 51687 Reims Cedex 2, France
^b ARD Société Agro Industrie Recherches et Développements, route de Bazancourt, 51110 Pomacle, France

^* Corresponding author (stephanie.boudesocque{at}univ-reims.fr).

Received for publication June 21, 2007. A lignocellulosic substrate (LS) obtained from our local agroindustry was used as a low-cost and effective adsorbent for the removal of pesticides from wastewaters. The studied pesticides were terbumeton (N-(1,1-dimethyl)-Nethyl-6-methoxy-1,3,5-triazine-2,4-diamine), desethyl terbumeton (N-(1,1-dimethylethyl)-6-methoxy-1,3,5-triazine-2,4-diamine), dimetomorph (4-[3-(4-chlorophenyl)-3-(3,4-dimethoxyphenyl)acryloyl]morpholine), and isoproturon (3-(4-isopropylphenyl)-1,1-dimethylurea). Batch and column experiments were conducted as a function of pH and pesticide concentration under laboratory and industrial conditions. The concentration range studied for the pesticides varied from 2 x 10^–7 to 3 x 10^–4 mol L^–1. The influence of organic and inorganic pollutants was assessed by studying the retention of pesticide in the presence of copper(II) and a surfactant. These experiments indicated that LS is an efficient adsorbent toward the investigated pesticides and has little influence of the other pollutants. The kinetic adsorptions are fast, and the amounts of adsorbed pesticide varied from 1 to 8 g kg^–1 of LS. These retention capacities show that LS can provide a simple, effective, and cheap method for removing pesticides from contaminated waters. Thus, this biomaterial may be useful for cleaning up polluted waters.

Abbreviations: BV, bed volume • DET, desethyl terbumeton • DIM, dimetomorph • HPLC, high-performance liquid chromatography • ISO, isoproturon • LS, lignocellulosic substrate • TER, terbumeton