• 关键词：碳纳米管预沉积  基膜孔径  膜污染机理  Hermia模型  传统滤饼过滤模型

• 基金项目：国家自然科学基金（No.51778014，51478009）

• 刘韦岩
• 北京工业大学, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124

• 王青山
• 北京工业大学, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124

• 盖晓莉
• 北京工业大学, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124

• 曾嘉
• 北京工业大学, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124

• 王钰
• 北京工业大学, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124

• 董梦婵
• 北京工业大学, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124

• 熊馨雅
• 北京工业大学, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124

• 吴曜辰
• 北京工业大学, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124

• 王宇飞
• 北京工业大学, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124

• 郭瑾
• 北京工业大学, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124

• 摘要：为探究碳纳米管(Carbon Nanotubes,CNTs)预沉积改性膜的污染机理,本研究使用正压过滤法将CNTs预沉积在3种孔径的有机膜(20 kDa聚醚砜膜、0.01 μm和0.1 μm聚偏二氟乙烯膜)表面,研究了CNTs预沉积改性膜过滤3种典型污染物(牛血清蛋白、腐殖酸、海藻酸钠)过程中的膜污染情况.根据比通量、Hermia模型和传统滤饼过滤模型,对恒压死端过滤3种典型污染物过程中的污染机理进行了系统评价.结果表明,20 kDa PES膜和0.01 μm PVDF膜表面预沉积CNTs改性后,过滤3种典型膜污染物质时的膜污染情况都得到了一定程度的缓解.20 kDa PES膜表面预沉积CNTs后过滤HA初期为完全孔堵塞与滤饼过滤相结合的复合污染机理,最终转变为滤饼过滤;过滤SA的污染机理为完全孔堵塞与滤饼过滤相结合的复合污染机理.0.01 μm PVDF膜表面沉积CNTs改性后过滤HA初期的污染机理为膜孔堵塞与滤饼过滤相结合的复合污染机理,然后经过向滤饼过滤转变的过渡阶段,最终形成滤饼过滤,且随着CNTs沉积量的增加,过渡阶段持续时间延长.0.1 μm PVDF膜表面预沉积CNTs后过滤3种污染物,均未能缓解膜污染,膜污染机理不受CNTs沉积改性的影响,其过滤BSA和HA的污染机理为膜孔堵塞,过滤SA过程的污染机理符合滤饼过滤.

• Abstract：In order to explore the fouling mechanism of carbon nanotubes (CNTs) pre-deposited membranes, 20 kDa polyethersulfone (PES) membranes, 0.01 μm and 0.1 μm polyvinylidene fluoride (PVDF) membranes were modified by pre-depositing CNTs on their surface through positive pressure filtration. Then the CNTs pre-deposited membranes were used to filtrate three typical foulants (Bovine serum albumin, BSA; Humic Acid, HA; Sodium alginate, SA) under constant pressure dead-end filtration condition. The fouling mechanism of the CNTs pre-deposited membranes was systematically analyzed by using the normalized flux curve, the Hermia model and the Conventional cake filtration model. The results showed that the pre-deposition of CNTs on 20 kDa PES and 0.01 μm PVDF membranes could alleviate membrane fouling. As for the CNTs modified 20 kDa PES membranes, the fouling during filtration HA was a combined complete blocking and cake filtration mechanism in initial, then it transformed to complete cake filtration mechanism. In filtrating SA, the fouling was a combined pore blockage and cake filtration mechanism. As for the CNTs modified 0.01 μm PVDF membranes, the fouling during filtration HA was a combined pore blockage and cake filtration mechanism in the initial, then it gradually transformed to complete cake filtration mechanism. With the increase of CNTs dosage, the transition time from the combined fouling mechanism to complete cake filtration mechanism was prolonged. As for the CNTs modified 0.1 μm PVDF membranes, the pre-deposition of CNTs did not alleviate membrane fouling. The fouling during filtration BSA and HA was characterized as pore blocking mechanism, and the fouling in filtrating SA was cake filtration mechanism. CNTs dosage did not influence its fouling mechanism.

• Key words：CNTs pre-deposited  basement membrane pore size  membrane fouling mechanism  Hermia model  traditional cake fouling filtration model

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