期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 530, 期 -, 页码 129-139出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2015.05.086
关键词
Fruit-packaging industry; Pesticide dissipation; Spent mushroom substrate; Biobeds; Sewage sludge; Pesticide sorption
资金
- Research Promotion Foundation of the Republic of Cyprus through the project: Evaluation of biobeds for the decontamination of wastewaters of agricultural origin - BIOBEDS [0308]
- Research Committee of the University of Thessaly
- Research Committee of the University of Thessaly through the Postgraduate Program Biotechnology-Quality assessment in Nutrition and the Environment, Department of Biochemistry and Biotechnology, University of Thessaly
Wastewaters from the fruit-packaging industry constitute a serious point source contamination with pesticides. In the absence of effective depuration methods, they are discharged in municipal wastewater treatment plants or spread to land. Modified biobeds could be an applicable solution for their treatment. We studied the dissipation of thiabendazole (TBZ), imazalil (IMZ), ortho-phenylphenol (OPP), diphenylamine (DPA) and ethoxyquin (EQ), used by the fruit-packaging industry, in anaerobically digested sewage sludge, liquid aerobic sewage sludge and in various organic substrates (biobeds packing materials) composed of soil, straw and spend mushroom substrate (SMS) in various volumetric ratios. Pesticide sorption was also determined. TBZ and IMZ showed higher persistence especially in the anaerobically digested sewage sludge (DT50 = 32.3-257.6 d), in contrast to OPP and DPA which were rapidly dissipated especially in liquid aerobic sewage sludge (DT50 = 1.3-9.3 d). EQ was rapidly oxidized mainly to quinone imine (QI) which did not persist and dimethyl ethoxyquinoline (EQNL, minor metabolite) which persisted for longer. Sterilization of liquid aerobic sewage sludge inhibited pesticide decay verifying the microbial nature of pesticide dissipation. Organic substrates rich in SMS showed the highest dissipation capacity with TBZ and IMZ DT50s of ca. 28 d compared to DT50s of >50 d in the other substrates. TBZ and IMZ showed the highest sorption affinity, whereas OPP and DPA were weakly sorbed. Our findings suggest that current disposal practices could not guarantee an efficient depuration of effluents from the fruit-packaging industry, whereas SMS-rich biobed organic substrates show efficient depuration of effluents from the fruit-packaging industry via accelerated dissipation even of recalcitrant fungicides. (C) 2015 Elsevier B.V. All rights reserved.
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