电化学氧化法处理垃圾焚烧发电厂沥滤液生化出水

doi:10.3969/j.issn.0438-1157.2013.04.037

化工学报 ›› 2013, Vol. 64 ›› Issue (4): 1396-1402.DOI: 10.3969/j.issn.0438-1157.2013.04.037

电化学氧化法处理垃圾焚烧发电厂沥滤液生化出水

陈波, 全学军, 程治良, 朱新才, 张树汉

重庆理工大学化学化工学院,重庆 400054

收稿日期:2012-07-10 修回日期:2012-08-28 出版日期:2013-04-05 发布日期:2013-04-05
通讯作者: 全学军
作者简介:陈波(1987—),男,硕士研究生。
基金资助:
重庆市节能减排科技"接力"行动科技专项(CSTC2010AA7060)。

Electrochemical oxidation of biologically treated leachate from municipal solid waste incineration plant

CHEN Bo, QUAN Xuejun, CHENG Zhiliang, ZHU Xincai, ZHANG Shuhan

College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China

Received:2012-07-10 Revised:2012-08-28 Online:2013-04-05 Published:2013-04-05
Supported by:
supported by the special "Saving Energy and Reducing Emission Action Plan" of Chongqing(CSTC2010AA7060).

摘要/Abstract

摘要： 垃圾焚烧发电厂储坑沥滤液是一种高污染、高氯离子和高胶体含量的废水,经过传统生化处理后仍难达标排放。根据生化出水中氯离子浓度较高的特点,面向实际工程应用,设计了板框式电化学反应器,以钛基氧化钌-氧化铱涂层电极(Ti/RuO₂-IrO₂)作为阳极,304钢板作为阴极,开展了电化学氧化去除废水中难生物降解有机物的研究。重点考察了电流密度、表观流速、氯离子浓度、电极极距等因素对去除废水COD的影响。结果表明:当电流密度为65.35 mA·cm^-2,反应器内表观流速为2.72 cm·s^-1,初始氯离子浓度为5000 mg·L^-1时,废水中COD的去除具有良好的效果。研究了COD去除的动力学过程,提出了反应体系中活性氯的减少可能是第二阶段COD去除速率降低的主要机理。对几种结构电化学反应器的能耗进行了对比分析表明,极距减小50%,去除COD的平均能耗可节约25%以上,紧凑多通道小电极极距结构在设计工业电化学反应器时值得考虑。

关键词: 城市固体废弃物沥滤液, 垃圾焚烧, 电化学氧化

Abstract: Incineration is an effective technology for municipal solid waste (MSW) disposal.However, the MSW leachate after bio-treatment still contains recalcitrant organic compounds, higher concentration of chloride ions and biogenic colloids.Their electrochemical oxidation was conducted in a newly designed filter-press electrochemical reactor.In the electrochemical oxidation process, NH₃-N could be easily removed by means of electro-generated chlorine/hypochlorite.The effects of major process parameters on the removal of organic pollutants were investigated systematically.Under experimental conditions, the optimum operation parameters are current density 65.35 mA穋m^-2, flow velocity 2.72 cm穝^-1 in electrode gap, initial chloride ion concentration 5000 mg稬^-1.The COD in the leachate could be reduced below 100 mg稬^-1 after 1 h of treatment.The kinetics and mechanism of COD removal were investigated by simultaneously monitoring the COD change and chlorine/hypochlorite production.The kinetics exhibits a two-stage kinetic model and the decrease of electro-generated chlorine/hypochlorite production is the major factor for slowing down of COD removal rate in the second stage.50% of reduction in electrode gap can result in saving more than 25% of energy consumption.A compact multi-channel bipolar structure should be taken in the design of industrial electrochemical reactors for wastewater treatment.

Key words: municipal solid waste leachate, refuse incineration, electrochemical oxidation

中图分类号:

X799.3

陈波, 全学军, 程治良, 朱新才, 张树汉. 电化学氧化法处理垃圾焚烧发电厂沥滤液生化出水[J]. 化工学报, 2013, 64(4): 1396-1402.

CHEN Bo, QUAN Xuejun, CHENG Zhiliang, ZHU Xincai, ZHANG Shuhan. Electrochemical oxidation of biologically treated leachate from municipal solid waste incineration plant[J]. CIESC Journal, 2013, 64(4): 1396-1402.

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电化学氧化法处理垃圾焚烧发电厂沥滤液生化出水

Electrochemical oxidation of biologically treated leachate from municipal solid waste incineration plant

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