Membrane bioreactors troubleshooting through the preparation of a high antifouling PVDF ultrafiltration mixed-matrix membrane blended with O-carboxymethyl chitosan-Fe3O4 nanoparticles
Membrane bioreactors troubleshooting through the preparation of a high antifouling PVDF ultrafiltration mixed-matrix membrane blended with O-carboxymethyl chitosan-Fe3O4 nanoparticles
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DOI：
10.1080/09593330.2018.1480665
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发表时间：
2019-11-23
影响因子：
2.8
通讯作者：
Zinadini, S.
中科院分区：
文献类型：
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作者：
Rahimi, Z.;Zinatizadeh, A. A.;Zinadini, S.
膜生物反应器（MBR）中常用的高分子超滤（UF）膜易被污染物污染。因此，本文采用O-羧甲基壳聚糖（OCMCS）功能化Fe 3 O 4纳米粒子（OCMCSFe 3 O 4）对聚偏氟乙烯（PVDF）超滤膜进行改性，以改善PVDF超滤膜的抗渗性能。采用共沉淀法合成Fe 3 O 4纳米粒子，通过吸附OCMCS制备改性剂。以活性污泥悬浮液为生物污染物，通过渗透试验，计算纯水通量恢复率（FRR）和膜污染阻力参数，评价膜的抗污染性能。此外，为了研究膜的蛋白质截留率，通过牛血清白蛋白（BSA）溶液进行渗透试验。根据所获得的结果，在低浓度的改性纳米粒子的包埋膜的表面亲水性得到改善。然而，OCMCS-Fe 3 O 4纳米颗粒的含量较高（>0.1？重量%）降低了膜性能，这是由于纳米颗粒在聚合物基质中的团聚。然而，1？重量% OCMCS-Fe_3 O_4膜的PWF和渗透性显著高于其它膜。这是因为膜中的缺陷和裂缝。0.05wt. % OCMCS-Fe_3 O_4/PVDF膜具有最高的FRR（95.7%）和蛋白质截留率（48%），最低的不可逆污染阻力（Rir）值（4.2%）。结果表明，纳米粒子改性的共混膜可获得与微滤膜相当的高通量超滤膜，而其分离性能与超滤膜相似。
Polymeric ultrafiltration (UF) membranes often used in membrane bioreactor (MBR) prone to be fouled by fouling agents. Therefore, in this paper, the antifouling characteristics of polyvinylidene fluoride (PVDF) UF membranes for wastewater treatment are improved through modifying membranes by O-carboxymethyl chitosan (OCMCS)-functionalized Fe3O4 nanoparticles (OCMCSFe3O4). The modifier agent was manufactured by the adsorption of OCMCS on Fe3O4 nanoparticles, which were synthesized via co-precipitating method. Antifouling performance of membranes was assessed by permeation tests done using activated sludge suspension as a biological foulant, then the calculation of the pure water flux recovery ratio (FRR) and fouling resistance parameters. Also, to investigate the protein rejection of membranes, permeation tests were conducted by the bovine serum albumin (BSA) solution. According to the obtained results, surface hydrophilicity of the embedded membranes was improved in the low concentrations of the modified nanoparticles. However, the high quantity of the OCMCS-Fe3O4 nanoparticles (>0.1?wt. %) in the casting solution lessened membrane performance owing to the agglomeration of the nanoparticles in the polymer matrix. Although, the 1?wt. % OCMCS-Fe3O4 membrane revealed considerably higher PWF and permeation than that of the other membranes. It was because of defects and cracks in the membranes. The 0.05 wt. % OCMCS-Fe3O4/PVDF membrane exhibited the highest FRR (95.7%) and protein rejection value (48%) and the lowest irreversible fouling resistance (Rir) value (4.2%). It is concluded that the blended membranes with modified nanoparticles resulted in a high-flux ultrafiltration membrane comparable with microfiltration membrane, while its separation properties remained similar to UF membrane.