摘要
为了改进直流电絮凝膜分离反应器(electrocoagulation-membrane cathode reactor,ECMCR)在实际应用中存在极板钝化、能耗高等不足,本研究开发了脉冲电絮凝膜分离反应器(pulsed electrocoagulation-membrane cathode reactor,PECMCR),并分析了其中的膜污染控制机制。研究发现ECMCR对腐殖酸(humic acid,HA)的去除率最高可达85.23%,相比之下相同产铝量和能耗下脉冲电絮凝膜分离反应器对HA的最佳去除效率可达到90%以上,且跨膜压差分别降低了36%和20%。PECMCR相较于ECMCR具有更好的HA去除效果和膜污染缓解效果,这可能是因为在脉冲电场的作用下,金属阳离子在溶液中加速扩散,减少或消除了金属阳极的钝化现象,从而有效提高HA的去除效率。而且HA与膜阴极之间的静电斥力降低了HA污染物在膜上的粘附,有助于进一步缓解膜污染。另外,脉冲电絮凝可以缓解电极钝化,有助于进一步节省能耗。此研究结果为PECMCR应用于水处理过程中膜污染控制提供了新的解决方案。
In order to improve the shortcomings of DC electrocoagulation-membrane cathode reactor(ECMCR)such as plate passivation and high energy consumption in practical applications,this study developed a pulsed electrocoagulation-membrane cathode reactor(PECMCR)and analyzed the membrane contamination control mechanism in it.It was found that ECMCR could remove humic acid(HA)up to 85.23%,by comparison,the optimal removal efficiency of HA of was higher than 90%by the pulsed electrocoagulation-membrane separation reactor with the same aluminum production and energy consumption,and their trans-membrane differential pressures decreased by 36%and 20%,respectively.PECMCR had better HA removal and membrane contamination mitigation effect compared with ECMCR,which may be attributed to the accelerated diffusion of metal cations in the solution under the action of pulsed electric field,which could reduce or eliminate the passivation phenomenon of the metal anode,and thus could effectively improve the removal efficiency of HA.Moreover,the electrostatic repulsion between HA and the membrane cathode could reduce the adhesion of HA pollutants on the membrane,which was conducive to further alleviating membrane contamination.In addition,pulsed electro-flocculation can alleviate electrode passivation,which was conducive to further saving energy consumption.The results of this study provide a new solution for the application of PECMCR to control membrane contamination in water treatment process.
作者
李发祥
朱宗强
孙境求
胡承志
LI Faxiang;ZHU Zongqiang;SUN Jingqiu;HU Chengzhi(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541004,China;State Key Laboratory of Environmental Water Quality,Ecological Environment Research Centre,Chinese Academy of Sciences(CAS),Beijing 100085;University of Chinese Academy of Sciences,Beijing 100049;Jiangsu Collaborative Innovation Centre for Water Treatment Technology and Materials,Suzhou University of Science and Technology,Suzhou 215009,China;School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2024年第3期808-816,共9页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(52125003、51820105011)
长江生态环境保护修复联合研究第二期(2022-LHYJ-02-0303)。
关键词
腐殖酸
电絮凝
膜分离
滤饼层
humic acid
electrocoagulation
membrane separation
filter cake layer
