BDD电极电化学氧化降解废乳化液

侯海盟; 祁国恕; 王坚; 李宝磊; 孔德勇; 赵岩; 陈明; 曾乐

doi:10.13205/j.hjgc.202201008

BDD电极电化学氧化降解废乳化液

doi: 10.13205/j.hjgc.202201008

侯海盟^1,2,3, ,,
祁国恕^1,2,3,
王坚^1,2,3,
李宝磊^1,2,3,
孔德勇^1,2,3,
赵岩^1,2,3,
陈明^1,2,3,
曾乐^1,4

1. 沈阳环境科学研究院, 沈阳 110167;
2. 国家环境保护危险废物处置工程技术(沈阳)中心, 沈阳 110167;
3. 辽宁省危险废物处置专业技术创新中心, 沈阳 110167;
4. 沈阳环科检测技术有限公司, 沈阳 110015

基金项目:

国家水体污染控制与治理科技重大专项(2018ZX07601-001)

沈阳市科技计划项目(20-206-4-06)

详细信息

通讯作者:
侯海盟(1985-),男,博士,高级工程师,主要研究方向为固危废利用处置及环境风险防控技术。houhaimeng@syhky.com

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出版历程
- 收稿日期: 2021-05-20
- 网络出版日期: 2022-03-30
- 刊出日期: 2022-03-30

ELECTROCHEMICAL OXIDATION OF WASTE EMULSION WITH BORON-DOPED DIAMOND ANODES（BDD）

HOU Haimeng^{1,2,3
, ,},
QI Guoshu^1,2,3,
WANG Jian^1,2,3,
LI Baolei^1,2,3,
KONG Deyong^1,2,3,
ZHAO Yan^1,2,3,
CHEN Ming^1,2,3,
ZENG Le^1,4

1. Shenyang Academy of Environmental Sciences, Shenyang 110167, China;
2. National Environmental Engineering Technology Center for Hazardous Waste Treatment, Shenyang 110167, China;
3. Technology Innovation Center for Hazardous Waste Treatment of Liaoning Province, Shenyang 110167, China;
4. Shenyang Huanke Testing Technology Co., Ltd, Shenyang 110015, China

摘要

摘要: 废乳化液是机械加工过程产生的一种高浓度有机废液,属于危险废物。通过实验研究了BDD电极电化学氧化处理废乳化液的降解效果,考察了电流密度、电解质种类及浓度、初始pH值和反应温度对降解效率的影响。结果表明:BDD电极电化学氧化可有效降解废乳化液中的有机物,当采用Na₂S₂O₈为电解质,电流密度超过60 mA/cm²时,降解4 h后COD降解率达到99%以上,单位质量(1 kg)COD降解能耗最大,约25 kW·h/kg。电流密度由20 mA/cm²增加至60 mA/cm²时,COD去除率可提高13%左右,单位能耗也会随之增加;电流密度为60 mA/cm²时,采用Na₂S₂O₈作为支持电解质降解2 h, COD降解率比NaCl和Na₂SO₄作为电解质高10%以上;提高反应温度和保持酸性条件均有利于增强COD降解效果。动力学分析表明:BDD电极电化学氧化降解废乳化液的过程符合一级反应动力学方程,电流密度<60 mA/cm²时,一级反应动力学常数k与电流密度基本呈线性关系。
- BDD电极 /
- 电化学 /
- 废乳化液 /
- 电流密度 /
- 电解质 /
- 动力学
Abstract: Waste emulsion is a kind of high-concentration organic wastewater produced from mechanical processing, which belongs to hazardous waste. Electrochemical oxidation of BDD electrode is an effective method to treat waste emulsion. In this paper, the degradation effect of the waste emulsion treated by electrochemical oxidation of the BDD electrode was studied experimentally, and the effects of current density, electrolyte type and concentration, initial pH value and reaction temperature on the degradation efficiency were investigated. The results showed that the electrochemical oxidation of BDD electrode could effectively degrade the organic matter in the waste emulsion. When Na₂S₂O₈ was used as the electrolyte and the current density was greater than 60 mA/cm², the COD degradation rate reached more than 99% after 4 hours of reaction, and the maximum energy consumption is about 25 kW·h/kg for per 1 kg of COD. When the current density increased from 20 mA/cm² to 60 mA/cm², the COD degradation rate increased by about 13 percentage points, and the energy consumption increased accordingly. When the current density was 60 mA/cm² and the reaction time was 2 hours, the degradation efficiency of COD using Na₂S₂O₈ as the supporting electrolyte was about 10% higher than that with NaCl and Na₂SO₄ as the electrolyte. Increasing electrolyte concentration, reaction temperature and acidic conditions was conducive to the degradation of organic matter. The kinetic analysis showed that the process of electrochemical oxidation of waste emulsion with BDD electrode conformed to the first-order reaction kinetic equation, and the relationship between the first-order reaction kinetic constant k and the current density kept basically linear when the current density was lower than 60 mA/cm².
- BDD electrode /
- electrochemistry /
- waste emulsion /
- current density /
- supporting electrolyte /
- kinetics

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