微波-过氧化氢工艺处理含Cu-EDTA废水  

Treatment of Cu-EDTA containing wastewater by microwave-H_2O_2 process

作　　者：王宏杰[1,2] 曹喆 赵子龙 董文艺 

机构地区：[1]哈尔滨工业大学深圳研究生院,广东深圳518055 [2]深圳市水资源利用与环境污染控制重点实验室,广东深圳518055

出　　处：《化工学报》2017年第12期4756-4763,共8页CIESC Journal

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07206-002);深圳市科技计划项目(JCYJ20160318093930497)~~

摘　　要：采用微波-过氧化氢工艺处理含Cu-EDTA废水,考察反应时间、初始pH、H_2O_2投加量、微波功率以及共存物质等因素对该工艺处理效能的影响,并分析了氧化作用机制。结果表明,在初始pH为3,H_2O_2投加量为41mmol·L-1,微波功率为210 W时,1.57 mmol·L-1 Cu-EDTA反应10 min后,Cu和TOC去除率分别高达97.0%和60.7%,出水电导率低至1.8 m S·cm-1,产泥量仅为0.15 g·L-1。NO-3的存在对Cu-EDTA的氧化降解过程无明显影响,而Cl-、H2PO-4和酒石酸对反应过程有一定的抑制作用。该工艺下反应4 min后Cu-EDTA基本氧化为中间产物,并在4~6 min内急剧降解,最终形成小分子羧酸类物质、NH3-N和无机碳。反应过程沉淀产物主要以Cu O形式存在。相比Fenton工艺,该工艺在氧化效能、出水电导率及产泥量等方面有显著优势。In the present study, microwave-H2O2（MW-H2O2） process was applied for the treatment of Cu-EDTA containing wastewater. The effects of reaction time, initial pH, H2O2 dosage, microwave power and coexistent substances were investigated in detail. The corresponding degradation mechanism of Cu-EDTA was also described. The results showed that for the elimination of 1.57 mmol·L-1 Cu-EDTA, the highest removal efficiencies of Cu（97.0%） and TOC（60.7%） were achieved under the optimum conditions（i.e. initial pH 3, H2O2 dosage 41 mmol·L-1, microwave power 210 W, and reaction time 10 min）. In this situation, the effluent conductivity decreased to 1.8 m S·cm-1, and only 0.15 g·L-1 of the sludge yield was generated. The presence of coexistent substances such as NO-3 had nearly no effects on the degradation processes, while Cl-, H2PO4- and tartaric acid were unfavorable to the oxidation degradation of Cu-EDTA. After treated for 4 min, Cu-EDTA was almost totally oxidized to various Cu-intermediates, which rapidly degraded within 4—6 min, leading to the final formation of low molecular organic acids, NH3-N, and inorganic carbon. The solid sludge mainly presented in the forms of CuO. Compared with traditional Fenton process, MW-H2O2 process exhibited more excellent performance in terms of oxidation efficiency, effluent conductivity and sludge yield.

关 键 词：微波-过氧化氢 Cu-EDTA 氧化 废水 芬顿 污染 

分 类 号：X78[环境科学与工程—环境工程]