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| The effect of ultrafiltration membrane materials on the combined fouling behavior of SiO2-organic coexist foulants |
| WU Gong-zheng, WANG Lei, WANG Pei, LI Xing-fei, MIAO Rui |
| Key Laboratory of Environmental Engineering of Shaanxi Province, Key Laboratory of Membrane Separation of Shaanxi Province, College of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China |
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Abstract In this study, for better understanding the effect mechanism of ultrafiltration (UF) membrane materials on the combined fouling behavior of SiO2-organic coexist foulants, two typical UF membranes—poly (vinylidene fluoride) (PVDF) and poly (ethylene-co-vinyl alcohol) (EVOH) were used. For the SiO2-humic acid (HA) and SiO2-bovine serum albumin (BSA) combined systems, the fouling experiments with single and combined foulants were carried out with PVDF and EVOH membranes, and the interaction forces between each foulant and membrane were investigated. The results indicated that, compared with HA or BSA, the SiO2-HA/BSA combined foulants led to two opposite fouling phenomena for PVDF and EVOH membranes, i.e. combined fouling was enhanced or mitigated. Combined with the results of interaction forces, it was easy to find that, for the SiO2-organic combined system, when the SiO2-membrane interaction force was stronger than the organic-membrane interaction force, the membrane fouling would be enhanced with the addition of inorganic SiO2 particles. In contrast, when the interaction force between SiO2 and membrane was weaker than that between organic and membrane, the membrane fouling would be mitigated with the addition of inorganic SiO2 particles. All these suggested that membrane material was close related to the combined fouling behavior of inorganic-organic foulants.
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Received: 29 September 2018
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