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Study on the surface modification ofhydrophobic PVDF hollow fiber membrane forMBfR

Authors： WEN Qi, WANG Xuan *, LU Xiaolong *, ZHANG Lijuan, WU Chunrui

Units： State key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University,Institution of Biological and Chemical Engineering,Tianjin 300387,China)

KeyWords： membrane biofilm reactor; hydrophobic membrane; interfacial polymerization; oxygen mass transfer performance

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2015,35(6):16-21

Abstract：

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.

Funds：

国家自然科学基金(51408415)，国家自然科学基金项目(21176188

AuthorIntro：

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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