摘要
毒死蜱工艺废水中含有吡啶类衍生物,属高浓度、难降解有毒有机废水。采用电催化氧化-微电解-混凝沉淀组合工艺对毒死蜱工艺废水进行预处理研究,结果表明,当电催化氧化单元进水pH值为3～4、电流密度为14mA/cm2、主反应器HRT为150 min,微电解单元铁炭比1∶1、进水pH值为3～4、HRT为100 min时,COD,TP,TOC的去除率分别为32.49%,37.39%,51.4%;在电催化氧化单元COD去除率出现负值,表明废水中吡啶类物质被有效分解。高效液相色谱分析结果表明,该预处理工艺对废水中3,6,5-三氯吡啶醇有着很好的去除效果,去除率达到99.9%以上。GC-MS分析结果表明,该预处理工艺对废水中的3,6,5-三氯吡啶醇分解彻底。
Chlorpyrifos wastewater which contains pyridine derivatives is highly concentrated refractory organic and toxic wastewater. Combined process of electro-catalytic oxidation- micro-electrolysis-coagulation sedimentation was used to pretreat chlorpyrifos wastewater. Results showed that the removal rates of COD, total phosphorus and TOC were 32.49%, 37.39% and 51.4%, respectively. When pH of electro-catalytic oxidation unit influent was 3～4, current density, HRT of main reactor, iron-carbon ratio of micro-electrolysis unit, pH of water inflow, hydraulic retention time was 14 mA/cm2, 150 min, 1：1, 3～4, 100 rain, respectively. When removal efficiency of COD in the electro-catalytic oxidation unit became negative, it indicated that pyridine derivatives in the wastewater were decomposed effectively. Results analyzed by HPLC-MS showed that 3,6,5-triehloro pyfidine alcohol could be removed effectively by using this pretreatment process, and the removal efficiency was more than 99.9%. Meanwhile, results analyzed by GC-MS showed that 3,6,5-trichloro pyridine alcohol could be decomposed thoroughly by using this pretreatment process.
出处
《环境科技》
2013年第1期21-25,共5页
Environmental Science and Technology
基金
公益性行业科研专项经费环保项目(200709025)
关键词
毒死蜱
工艺废水
电催化氧化
微电解
混凝沉淀
预处理
Chlorpyrifos
Process wastewater
Electro-catalytic oxidation
Micro -electrolysis
Coagulationsedimentation
Pretreatment
