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Ozonation as an efficient pretreatment method to alleviate reverse osmosis membrane fouling caused by complexes of humic acid and calcium ion |
Xuehao Zhao1, Yinhu Wu1(), Xue Zhang2, Xin Tong1, Tong Yu1, Yunhong Wang1, Nozomu Ikuno3, Kazuki Ishii3, Hongying Hu1,4() |
1. Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), School of Environment, Tsinghua University, Beijing 100084, China 2. Collaborative Innovation Center for Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China 3. Kurita Water Industries Ltd., Nakano-ku, Tokyo 164-0001, Japan 4. Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, China |
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Abstract Humic acids (HA) didn’t cause obvious reverse osmosis (RO) membrane fouling in 45 h. Osmotic pressure (NaCl) affected slightly the RO membrane fouling behavior of HA. Ca2+ promoted aggregation of HA molecules and thus aggravated RO membrane fouling. Ozonation eliminated the effect of Ca2+ on the RO membrane fouling behavior of HA. The change of the structure of HA was related to its membrane fouling behavior. Humic acid has been considered as one of the most significant sources in feed water causing organic fouling of reverse osmosis (RO) membranes, but the relationship between the fouling behavior of humic acid and the change of its molecular structure has not been well developed yet. In this study, the RO membrane fouling behavior of humic acid was studied systematically with ozonation as a pretreatment method to control RO membrane fouling. Furthermore, the effect of ozone on the structure of humic acid was also explored to reveal the mechanisms. Humic acid alone (10–90 mg/L, in deionized water) was found not to cause obvious RO membrane fouling in 45-h operation. However, the presence of Ca2+ aggravated significantly the RO membrane fouling caused by humic acid, with significant flux reduction and denser fouling layer on RO membrane, as it was observed by scanning electron microscope (SEM) and atomic force microscope (AFM). However, after the pretreatment by ozone, the influence of Ca2+ was almost eliminated. Further analysis revealed that the addition of Ca2+ increased the particle size of humic acid solution significantly, while ozonation reduced the SUVA254, particle size and molecular weight of the complexes of humic acid and Ca2+ (HA-Ca2+ complexes). According to these results and literature, the bridge effect of Ca2+ aggregating humic acid molecules and the cleavage effect of ozone breaking HA-Ca2+ complexes were summarized. The change of the structure of humic acid under the effect of Ca2+ and ozone is closely related to the change of its membrane fouling behavior.
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Keywords
Reverse osmosis
Membrane fouling
Humic acid
Ca2+
Ozone
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Corresponding Author(s):
Yinhu Wu,Hongying Hu
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Issue Date: 15 May 2019
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