ZHUMing-fei,ZHENGCheng-long,CUIWen,et al.Effect of Molecular Weight on Forward Osmosis Membrane for Separation of Organic Matters in Natural Water[J].China Water & Wastewater,2024,40(9):107-115.
Effect of Molecular Weight on Forward Osmosis Membrane for Separation of Organic Matters in Natural Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第9期
Page:
107-115
Column:
Date of publication:
2024-05-01
- Keywords:
- forward osmosis; molecular weight; organic matter; membrane fouling; interfacial energy barrier
- Abstract:
- This paper investigated the effect of molecular weight on the performance of forward osmosis membrane for separation of the target organic matters such as macromolecular weight sodium alginate (SA) and medium molecular weight tannic acid (TA) and natural organic matters (NOM). Compared with macromolecular weight SA and small molecular weight fulvic acid (FA), the fouling of membrane for separating medium molecular weight TA and bovine serum albumin (BSA) was more serious, and the flux loss of the membrane for separating TA, BSA, FA and SA was 54.72%, 49.91%, 29.64% and 16.52%, respectively. When the NOM in water samples were mainly distributed in large, medium and small molecular weight, the flux loss was 46.5%, 54.8% and 50.5%, respectively, and the membrane fouling caused by NOMs with medium molecular weight was more serious. In addition, the higher content of macromolecular weight NOM would reduce the membrane fouling, and the rejection rate of NOM with different molecular weights was always more than 89%. The interfacial energy barrier between the foulants and membrane was determined according to XDLVO theory. The water samples mainly composed of macromolecular organic matters had large interfacial energy barriers (ΔEb=5.71×10-20 J for SA and ΔEb=9.32×10-21 J for filter backwash water), indicating that the repulsion between foulants and the membrane was large and the membrane fouling was not serious.
Last Update:
2024-05-01