MBfR中表面改性疏水性PVDF中空纤维膜污染特性研究

MEMBRANE FOULING CHARACTERISTICS OF SURFACE MODIFIED HYDROPHOBIC PVDF HOLLOW FIBER MEMBRANE FOR MBfR

针对膜生物膜反应器(MBf R)研究中疏水性微孔膜供氧能力不足、耐污染性较差等问题,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,研究制备适用于MBf R技术的中空纤维复合膜。选取典型有机污染物牛血清白蛋白(BSA)、腐殖酸(HA)、海藻酸钠(SA),考察原膜及表面改性膜的抗污染性能。结果表明,表面改性膜的BSA、HA、SA吸附量均低于原膜,分别为原膜的58.6%、56.1%及96.0%;进一步的氧传质实验结果表明3种有机物污染后,改性膜的氧总转移系数衰减率分别为14.4%、15.5%及21.1%,均低于原膜(分别为23.8%、26.8%及38.9%),显示表面改性膜具有良好的抗污染性能。

In order to recover some disadvantages of hydrophobic hollow fiber membrane used in the MBf R, such as insufficient oxygen supply capacity and poor antifouling properties, surface of self-made hydrophobic polyvinylidene fluoride（PVDF） hollow fiber membrane was modified for MBf R technology by the method of interfacial polymerization. Bovine serum albumin（BSA）, humic acid（HA） and sodium alginate（SA） were used as typical organic pollutants in order toinvestigate the anti-pollution ability of the original and the modified membrane. The results showed that, BSA, HA and SA adsorption amount of modified membrane were less than that of the original membrane, and the adsorption quantity were 58.6%, 56.1% and 96.0%respectively compared with the original. The further oxygen mass transfer experiments showed that,after being polluted, the total oxygen transfer coefficient of the modified membrane attenuation rates were 14.4%, 15.5% and 21.1%, respectively, lower than that of the original membrane（23.8%, 26.8% and38.9%, respectively）, which indicated that anti-fouling capability of modified membrane was better than that of the original membrane.