耦合吸附和电芬顿技术的导电超滤膜深度处理化工废水研究

Advanced treatment of chemical industry wastewater by conductive ultrafiltration membrane coupled with adsorption and electro-Fenton

中文关键词: 膜分离  吸附  电芬顿  水处理

英文关键词: membrane separation  adsorption  electro-Fenton  water treatment

中文摘要:

      受限于分离膜选择性和渗透性之间的trade-off效应，传统超滤膜难以高效截留化工废水中的有机污染物，常导致出水水质难以达标。鉴于此，本研究制备了一种兼具吸附和电催化功能的导电超滤膜，能有效提高废水处理效率。其制备流程为，首先通过湿法纺丝技术制备碳纳米管-聚偏氟乙烯（CNT-PVDF）导电超滤膜，然后以动态过滤的方式，将氧化炭黑（OCB）负载到膜表面，得到OCB-CNT-PVDF膜。结果表明:吸附对苯酚（25 mg/L）的去除率达到80%，电芬顿对苯酚的降解率达到89%，是传统商业PVDF膜的8~9倍；对某精细化工企业生产废水二级出水（COD：65~75 mg/L）的COD去除率大于50%，展现出良好的废水处理效果；通过吸附-电芬顿再生连续转换的运行模式，能实现对废水长期稳定的处理（出水COD<50 mg/L），满足工业用水水质（GB/T 19923-2024）。OCB-CNT-PVDF膜在一定程度上缓解了trade-off效应，在废水深度处理中展现出良好的应用前景。

英文摘要:

      The trade-off effect between the selectivity and permeability of separation membranes makes it difficult for traditional ultrafiltration membranes to efficiently reject organic pollutants in chemical industry wastewater. As a result, the effluent quality is hard to meet discharge standards. In this study, a conductive ultrafiltration membrane with both adsorption and electro-catalytic functions was developed, significantly enhancing wastewater treatment efficiency. The fabrication process involves two main steps: creating a carbon nanotube-polyvinylidene difluoride (CNT-PVDF) conductive ultrafiltration membrane by using wet-spinning technology, and loading of oxidized carbon black (OCB) onto their surface through dynamic filtration to obtain the OCB-CNT-PVDF membrane. The experimental results show that the adsorption removal efficiency of phenol (25 mg/L) reaches 80%, and the electro-Fenton degradation efficiency of phenol reaches 89%, which is 8-9 times higher than that of traditional commercial PVDF membranes. When a secondary biochemical effluent (COD: 65-75 mg/L) from a fine chemical enterprise was treated by the OCB-CNT-PVDF membrane, the result exhibits over 50% COD removal efficiency, demonstrating the robust wastewater treatment performance. Notably, through the adsorption/electro-Fenton-regeneration continuously switched operational mode, stable wastewater treatment could be achieved, with the COD (<50 mg/L) meeting industry water quality standards (GB/T 19923-2024). The OCB-CNT-PVDF membrane mitigates the selectivity/permeability trade-off effect to a certain extent and shows promising applications in advanced wastewater treatment.