腐殖酸-牛血清蛋白混合污染物的超滤膜污染行为

Fouling behavior of ultrafiltration membrane caused by protein and humic acid mixtures

采用聚偏氟乙烯(PVDF)超滤膜,分别过滤牛血清蛋白(BSA)、腐殖酸(HA)单种污染物溶液及HA-BSA二元混合污染物溶液,结合相应污染物在膜面吸附行为及膜污染微观作用力,解析HA-BSA混合污染物的超滤膜污染行为.结果发现,相比于BSA,HA-BSA混合物引起的膜污染速率及不可逆污染明显减缓;相反,与HA相比,HA-BSA混合物加剧了膜污染速率及不可逆污染.由于膜污染微观作用力存在差异,HA-PVDF<HA-BSA混合污染物PVDF<BSA-PVDF,且混合污染物间作用力也明显大于HA HA间但小于BSA-BSA间作用力强度,导致混合污染物在膜面的吸附累积速率及污染层密实度介于HA和BSA污染物之间,最终导致HA-BSA混合污染物引起的膜污染速率及不可逆污染大于HA污染膜,而小于BSA污染膜.

In this study,PVDF ultrafiltration membranes were used to filter the single pollutant solution of bovine serum albumin(BSA),humic acid(HA)and HA-BSA binary mixed pollutant solution,and to study the corresponding pollutant adsorption behavior on the membrane surface and the membrane.Contamination micro-force,ultrafiltration membrane pollution behavior of HA-BSA mixed pollutants werealso investigated.The results show that compared with BSA,the membrane fouling rate and irreversible pollution caused by the HA-BSA mixture are significantly slowed down;on the contrary,compared with HA,the HA-BSA mixture intensifies the membrane fouling rate and irreversible pollution.This is mainly caused by the difference in micro-effects of membrane pollution:HA-PVDF<HA-BSA mixed pollutants PVDF<BSA-PVDF,and the force between mixed pollutants is also significantly greater than HA HA but less than the BSA-BSA force intensity.This results in the adsorption accumulation rate of the mixed pollutants on the membrane surface and the compactness of the pollution layer between HA and BSA pollutants,and eventually results in the membrane pollution rate and irreversible pollution caused by HA-BSA mixed pollutants being greater than that of HA-polluted membranes,but less than BSA contaminated membrane.