以脱硫废水电解产物活性氯为氧化剂的湿法脱汞工艺  

Experimental study on wet demercury removal by active chlorine electrolysis products in desulfurization wastewater

作　　者：李潇祎 龙一飞 刘世念 赵宁 尹雅洁 胡将军[1] LI Xiaoyi;LONG Yifei;LIU Shinian;ZHAO Ning;YIN Yajie;HU Jiangjun(School of Resources and Environmental Sciences,Wuhan University Wuhan 430072,China;China Southern Power Grid Technology Company Limited,Guangzhou 510080,China)

机构地区：[1]武汉大学资源与环境科学学院,武汉430072 [2]南方电网电力科技股份有限公司,广州510080

出　　处：《环境工程学报》2022年第4期1265-1271,共7页Chinese Journal of Environmental Engineering

基　　金：南方电网科技项目(GDKJXM20183546)。

摘　　要：采用脱硫废水电解产物活性氯(HClO和Cl_(2))作为氧化剂,在自制鼓泡反应器中研究反应温度、pH、入口汞浓度、NO浓度、SO_(2)浓度等主要参数对Hg^(0)氧化效果的影响,并简要探究其反应机理。结果表明,电解产物活性氯能有效促进Hg^(0)的氧化脱除,反应中最佳HClO浓度为4 ^(mmol·L−1),Cl_(2)质量浓度为0.4μg·m^(−3),其最适宜反应温度为45℃;酸性条件有助于Hg^(0)的氧化吸收,最适宜氧化的pH为4.35~6.04;Hg^(0)氧化效率随SO_(2)质量浓度增加呈现先升高后降低的趋势,其脱除率最高可达87.46%。NO的存在对Hg^(0)氧化有一定的促进作用,该方法对不同入口汞浓度有较强适应性。本研究结果可为WFGD同步脱硫脱汞提供参考。The effects of the main parameters such as reaction temperature,pH,inlet mercury concentration,NO concentration and SO_(2)concentration on the oxidation effect of Hg^(0)were studied in self-made bubble reactors using activated chloride(HClO and Cl_(2))as oxidants in desulfurized wastewater electrolytic products,and the reaction mechanism was briefly explored.The results showed that the active chlorine of the electrolytic product effectively promoted the oxidation and removal of Hg^(0),determined that the optimal HClO concentration was 4 mmol·L^(−1),the Cl_(2)concentration was 0.4μg·m^(−3),and the optimum reaction temperature was 45℃;acidic conditions were conducive to the oxidation absorption of Hg^(0),which was the most suitable.The oxidation pH range was 4.35~6.04;the oxidation efficiency of Hg^(0)increased first and then decreased with the increase of SO_(2)concentration,with a removal rate of 87.46%.The existence of NO had a certain promotional effect on the oxidation of Hg^(0).This method had strong adaptability to different inlet mercury concentrations and a good industrial application prospect.The results of this study can provide a reference for the simultaneous desulfurization and mercury removal of WFGD.

关 键 词：脱硫废水电解产物 活性氯 湿式氧化 脱汞 

分 类 号：X511[环境科学与工程—环境工程]