Pesticide Industry Wastewater Treatment with Photo-Fenton Process

Ebru Çokay, Serkan Eker
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引用次数: 1

Abstract

: Pesticides are agricultural drugs used to combat weeds, plants, and insects that are harmful to the product and affect the efficiency during the cultivation of plants. However, pesticides are highly toxic, carcinogenic, and mutagenic, even at low concentrations and pesticides persist in nature for a long period. Pesticide manufacturing industry wastewater causes pollution problems due to the toxic components, high chemical oxygen demand (COD), biochemical oxygen demand (BOD), high total dissolved solids (TDS) and intensive color, disgusting odor, and generally low pH values. Since adequate treatment efficiency cannot be obtained with biological treatment in these wastewaters, chemical processes based on advanced oxidation methods are needed for the removal of toxicity and organic load caused by pesticide wastewater. Advanced oxidation methods are based on the formation of hydroxyl radicals (OH • ) and provide the conversion of toxic organic substances into harmless products. The major objective of this study was to investigate the oxidation of raw pesticide wastewater using the photo-Fenton process by using a Box-Behnken statistical experimental design and surface response methodology. In the photo-Fenton experiments, the effects of different oxidant and catalyst concentrations for COD removal at different reaction times were investigated using Box-Behnken statistical design. Because of the studies, the most appropriate reaction conditions according to COD removal are: H 2 O 2 concentration of 1000 mg/L, Fe +2 concentration of 325 mg/L, reaction time of 35 min, and COD yield of 70%.
光fenton法处理农药工业废水
农药是一种农业药物,用于对抗杂草、植物和昆虫,这些药物对产品有害,并影响植物种植的效率。然而,农药具有剧毒、致癌性和诱变性,即使浓度很低,农药在自然界中也能长期存在。农药制造工业废水因其有毒成分、化学需氧量(COD)、生化需氧量(BOD)高、总溶解固形物(TDS)高、颜色浓烈、气味难闻、pH值普遍较低而造成污染问题。由于这些废水的生物处理无法获得足够的处理效率,因此需要基于高级氧化方法的化学处理来去除农药废水引起的毒性和有机负荷。高级氧化方法是基于羟基自由基(OH•)的形成,并提供有毒有机物质转化为无害产品。本研究的主要目的是利用Box-Behnken统计实验设计和表面响应方法,研究光- fenton工艺对农药废水的氧化作用。在光- fenton实验中,采用Box-Behnken统计设计考察了不同氧化剂和催化剂浓度在不同反应时间下对COD去除率的影响。经研究,COD去除率最佳的反应条件为:h2o2浓度为1000 mg/L, Fe +2浓度为325 mg/L,反应时间为35 min, COD得率为70%。
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