School of Chemical Engineering, Kavosh Institute of Higher Education, Mahmood Abad, Iran.
Membrane Research Group, Nanotechnology Research Institute, Faculty of Chemical Engineering, Babol Noshirvani University of Technology, Babol, Iran E-mail:
Water Sci Technol. 2019 Dec;80(12):2273-2283. doi: 10.2166/wst.2020.044.
In the current work, novel dynamic membranes (DM) were tested and introduced for cheese whey wastewater treatment based on resistant and inexpensive materials, polyesters, and chitosan. For the investigation of dynamic membrane (pre-coated and self-forming) characterizations, polyester as a low-cost and natural material with chitosan were chosen to provide the support of the target membrane. The inherent antifouling character of chitosan accompanied by its high hydrophilicity have made this polymer known as an attractive agent for membrane-based wastewater treatment operations. Zinc oxide (ZnO) and powdered activated carbon (PAC) were employed as the dynamic layer. Neat polyester had a chemical oxygen demand (COD) rejection ratio of about 57.61%, but the flux declined sharply. The higher removal efficiency was for the self-forming type: total phosphate (94%) and citrate (95.5%). Fouled dynamic membranes were backwashed by sodium dodecyl-sulphate (SDS), warm water, and distilled water. Results demonstrated that the pre-coated was reduced and fouling increased the flux recovery rate (FRR) (9.1%) while use of the self-forming DM exhibited an aggravation of fouling by decreasing of support FRR (11.1%). It was found that by substitution of deionized water and hot water with SDS, FRR was enhanced. In the following, the photocatalytic ability of the product was investigated. The UV light source increased the removal ratio and FRR. For example, self-forming COD rejection was enhanced (6.63%).
在当前的工作中，我们测试并引入了基于耐用且廉价材料聚酯和壳聚糖的新型动态膜（DM），用于处理奶酪乳清废水。为了研究动态膜（预涂覆和自形成）的特性，选择了低成本和天然材料聚酯与壳聚糖来为目标膜提供支撑。壳聚糖固有的抗污染特性及其高亲水性使其成为膜基废水处理操作的有吸引力的药剂。氧化锌（ZnO）和粉末状活性炭（PAC）被用作动态层。纯聚酯对化学需氧量（COD）的去除率约为 57.61%，但通量急剧下降。自形成型的去除效率更高：总磷酸盐（94%）和柠檬酸盐（95.5%）。污染的动态膜可以用十二烷基硫酸钠（SDS）、温水和蒸馏水进行反冲洗。结果表明，预涂覆会降低通量恢复率（FRR）（9.1%），而自形成 DM 的使用会因支撑 FRR 的减少而加剧污染（11.1%）。发现用 SDS 代替去离子水和热水可以提高 FRR。随后，研究了产物的光催化能力。紫外光源提高了去除率和 FRR。例如，自形成 COD 的去除率得到了提高（6.63%）。
