应用于Anammox-MBR的尼龙织布亲水改性研究

采用聚乙烯醇（PVA）对尼龙织布表面涂覆改性，对改性前后织布进行表征并进行纯水通量测试，随后以牛血清蛋白（BSA）模拟污染物测试尼龙织布改性前后的抗污染性能，并对改性后的织布进行溶解性有机碳（DOC）浸出实验.改性过程中，优选3%涂覆浓度和250μm涂层厚度，改性后织布的纯水通量值约提高85.0%，对BSA的截留率由6.0%±0.5%上升至7.2%±0.7%，通量恢复率由90.0%提高到96.1%，可逆污染比重上升，不可逆污染比重下降，污染形式主要表现为可逆污染.为避免改性尼龙织布应用于厌氧氨氧化-膜生物反应器（Anammox-MBR）时对厌氧氨氧化反应产生不可逆危害，提出应对制备完成的改性尼龙织布进行为期3d及以上的静态清水浸泡或动态浸出处理.

Hydrophilic modification of nylon fabric mesh applied in Anammox-MBR

Nylon fabric mesh was modified via coating polyvinyl alcohol (PVA). The pristine and modified nylon fabric mesh was subjected to different characterizations, and the water permeability was investigated as well. Furthermore, the fouling resistance of nylon fabric mesh was discussed through BSA solution filtration tests. In addition, the leaching of soluble organic carbon (DOC) was evaluated during the application of the modified nylon fabric mesh. In this study, the PVA coating concentration of 3% and coating thickness of 250μm were preferred. After modification, the water flux increased by 85.0%, and the BSA retention rate increased from 6.0%±0.5% to 7.2%±0.7%. Besides, the flux recovery ratio increased from 90.0% to 96.1%. Meanwhile, the reversible fouling ratio and irreversible fouling ratio has risen and fallen respectively, and the main form of pollution was reversible pollution. It should be noted that in order to avoid the increase of DOC in the reaction caused by the leaching of the modified coating, which will cause irreversible harm to the activity of anammox bacteria, it is suggested that the prepared modified nylon fabric mesh should be soaked in water or treated in dynamic leaching for 3days or so before application.