Zhao Kai, Yang Chun-Feng, Sun Jing-Qiu, Li Jing, Hu Cheng-Zhi
School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China.
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Huan Jing Ke Xue. 2016 Nov 8;37(11):4255-4260. doi: 10.13227/j.hjkx.201605040.
In this study, the electro chemical parameters were regulated to control the floc morphology in order to mitigate membrane fouling. The main effects of current density, initial pH and conductivity on the floc characteristics and flux were studied, and the mechanisms of interaction between flocs with different morphology structures and ultrafiltration membranes were analyzed. The results showed that the key to mitigate the membrane fouling by electrocoagulation was to form a loose and porous cake layer on the membrane surface. The electrocoagulation-ultrafiltration (EC-UF) technology could not only effectively mitigate the membrane fouling, but also greatly enhance the water quality of the effluent. By increasing the current density and keeping water quality conditions at neutral pH, the EC-UF technology could maintain a higher flux. Under conditions of =20 A·m, initial pH=7 and initial conductivity=1000 μS·cm, the removal rate of humic acid (HA) was 97%, and the normalized specific flux of was 81%.
在本研究中，调节电化学参数以控制絮体形态，从而减轻膜污染。研究了电流密度、初始pH值和电导率对絮体特性和通量的主要影响，并分析了不同形态结构的絮体与超滤膜之间的相互作用机制。结果表明，通过电凝聚减轻膜污染的关键是在膜表面形成疏松多孔的滤饼层。电凝聚-超滤（EC-UF）技术不仅能有效减轻膜污染，还能显著提高出水水质。通过提高电流密度并将水质条件保持在中性pH值，EC-UF技术可以维持较高的通量。在电流密度为20 A·m²、初始pH值为7、初始电导率为1000 μS·cm的条件下，腐殖酸（HA）的去除率为97%，归一化比通量为81%。
