膜科学与技术

MBfR中疏水性PVDF中空纤维膜表面改性研究

作者：温琦，王暄，吕晓龙，张利娟，武春瑞

单位：中空纤维膜材料与膜过程省部共建国家重点实验室，生物化工研究所，天津工业大学，天津 300387

关键词：膜生物膜反应器；疏水膜；界面聚合；氧气传质性能

出版年,卷(期):页码： 2015,35(6):16-21

摘要：

本文针对膜生物膜反应器（Membrane Biofilm Reactor，MBfR）研究中疏水微孔膜供氧能力不足、耐污染性较差等问题，以壳聚糖（CS）和均苯三甲酰氯（TMC）为水、油两相单体，采用界面聚合法对自制疏水性聚偏氟乙烯（PVDF）中空纤维膜进行表面改性，采用正交实验法针对水相及油相单体浓度、界面聚合时间及热处理温度等参数对改性PVDF复合膜性能的影响进行系统研究，以氧传质性能为评价指标优化表面改性条件。并选取牛血清白蛋白（BSA）、腐殖酸（HA）、海藻酸钠（SA）为典型有机污染物，考察改性PVDF膜的抗污染能力。结果表明，在最佳表面改性条件TMC浓度0.35wt%，CS浓度0.30 wt%，界面聚合时间15min，热处理温度70℃时，改性PVDF膜与原膜具有相似的机械强度，氧气传质性能提高（氧总转移系数为原膜的1.8倍），亲水性增强（接触角自原膜69.8°降至39.9°），并具有优于原膜的抗污染能力。

In order to recoverovercome some disadvantages ofhydrophobic hollow fiber membrane used in the MBfR, such as insufficient oxygen supply capacity and poor antifouling properties,a interfacial polymerization was used to research the surface modification of self-madehydrophobic polyvinylidene fluoride (PVDF) hollow fiber membrane, chitosan(Cs) was selected as the aqueous phase monomer, together with trimesoyl chloride(TMC) as oil phase monomer. Orthogonal experimental method was chosen to study the effects of the monomer concentrations inthe water and oil phases, interfacial polymerization time and heat treatment time on the performance of composite membrane systematically, in which the oxygen mass transfer performance was used as evaluation index and the Bovine serum albumin (BSA), humic acid (HA) and sodium alginate (SA) were used as the typical organic pollutants to investigate the anti-pollution capacity of the membranes.The results show that the modified membrane had a similar mechanical strength compared with the original membrane, when the concentrations of TMC and CS is 0.35 wt% and 0.30 wt% respectively, interfacial polymerizationtime is 15 min and heat treatment temperature is 70℃, the oxygen transfer coefficient of the modified membrane was increased (oxygen transfer coefficient was 1.8 times than the original membrane), the surface hydrophilicity of the modified membrane was improved (contact angle decreased from 69.8° of the original membrane to 39.9°), the pollution resistantanti-foulingabilityof the modified membrane is superior to that of the original membrane.

温琦（1988-），女，硕士研究生，疏水性PVDF膜表面改性及MBfR应用研究E-mail：wenqi428@163.com

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