亲水改性PVDF膜材料及其膜生物反应器应用

Novel antifouling PVDF membrane with hydrophilic modification and its application in membrane bioreactor

膜生物反应器(MBR)技术中最常用的膜材料是聚偏氟乙烯(PVDF),然而由于PVDF膜的疏水性,使其在用于MBR的运行过程中存在易污染、通量低等缺陷,因此对PVDF膜材料进行亲水改性是近年来国内外研究的热点。本文首先介绍了PVDF膜材料典型的表面涂覆改性和表面化学接枝改性这两种亲水改性方法,然后概述了随着纳米科学技术的兴起,采用无机纳米材料如碳材料氧化石墨烯(GO)、无机抑菌材料纳米银粒子及二氧化钛纳米颗粒等进行功能化复合制备PVDF膜材料等亲水改性方法。研究进展表明,新型亲水改性PVDF膜材料不仅在MBR污/废水处理中优势明显,而且在可再生生物能源生产等可持续发展领域极具潜力。

Polyvinylidene fluoride(PVDF)is the most commonly used membrane material in membrane bioreactor(MBR)technology.However,PVDF membrane is facing some bottlenecks such as membrane fouling and low permeates flux due to the hydrophobicity of PVDF materials.Therefore,hydrophilic modification of PVDF membrane materials is a hot research topic in recent years.In this review two typical modification methods like membrane coating and grafting of PVDF membrane materials are introduced firstly.Then,with the development of nanotechnology,the hydrophilic modification methods such as the inorganic composite materials including carbon material graphene oxide(GO),inorganic antibacterial material nano silver particles and TiO2 nanoparticles for functional preparation of PVDF membrane materials are also summarized.With the advantages of straightforward preparation processes,easy to control and broad selectivity of modification materials,MBR systems with new PVDF membranes exhibit great potential in industry,not only for wastewater treatment and re-utilization,but also for the production of bioenergy.