CIESC Journal ›› 2017, Vol. 68 ›› Issue (12): 4756-4763.DOI: 10.11949/j.issn.0438-1157.20170776

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Treatment of Cu-EDTA containing wastewater by microwave-H2O2 process

WANG Hongjie1,2, CAO Zhe1,2, ZHAO Zilong1,2, DONG Wenyi1,2   

  1. 1 School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, Guangdong, China;
    2 Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control, Shenzhen 518055, Guangdong, China
  • Received:2017-06-15 Revised:2017-08-11 Online:2017-12-05 Published:2017-12-05
  • Supported by:

    supported by the Urban Water Pollution Control and Management Generic Technology Integrated Program (2012ZX07206-002) and the Knowledge Innovation Program of Shenzhen Basic Research Project (JCYJ20160318093930497).

微波-过氧化氢工艺处理含Cu-EDTA废水

王宏杰1,2, 曹喆1,2, 赵子龙1,2, 董文艺1,2   

  1. 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
  • 通讯作者: 赵子龙
  • 基金资助:

    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)。

Abstract:

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 mS·cm-1, and only 0.15 g·L-1 of the sludge yield was generated. The presence of coexistent substances such as NO3- 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.

Key words: microwave-hydrogen peroxide, Cu-EDTA, oxidation, wastewater, Fenton, pollution

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、H2O2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,H2O2投加量为41 mmol·L-1,微波功率为210 W时,1.57 mmol·L-1Cu-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 mS·cm-1,产泥量仅为0.15 g·L-1。NO3-的存在对Cu-EDTA的氧化降解过程无明显影响,而Cl-、H2PO4-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CuO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。

关键词: 微波-过氧化氢, Cu-EDTA, 氧化, 废水, 芬顿, 污染

CLC Number: