A solar photo-thermochemical hybrid system using peroxydisulfate for organic matters removal and improving ultrafiltration membrane performance in surface water treatment
A solar photo-thermochemical hybrid system using peroxydisulfate for organic matters removal and improving ultrafiltration membrane performance in surface water treatment
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使用过二硫酸盐去除有机物并提高地表水处理中超滤膜性能的太阳能光热化学混合系统
DOI：
10.1016/j.watres.2020.116482
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发表时间：
2021-01-01
期刊：
影响因子：
12.8
通讯作者：
Tang, Xiaobin
中科院分区：
文献类型：
--
作者：
Guo, Yuanqing;Liang, Heng;Tang, Xiaobin
太阳能被认为是水处理中污染物降解最有前途的能源之一。采用创新的太阳能光热化学系统，以过二硫酸盐（PDS）作为氧化剂，以氙灯作为太阳照射光源，希望在处理真实地表水时降解有机物并减轻超滤（UF）膜污染。此外，还以热激活PDS预处理作为对比，探究太阳光效应和热效应各自的比例，发现在反应温度低于50℃时，太阳光效应主导PDS降解天然有机物（NOMs）的活化，并且在>50℃温度下两者均有助于自由基的产生。结果表明，太阳光激活PDS预处理显着减轻了跨膜压力最高的松花江水造成的膜污染。 70℃时，TMP（TMP）减少约69.6%。在太阳光存在下，给水中的有机物质（以DOC、UV254和最大荧光强度为特征）和微污染物（莠去津）得到更好的降解。总污垢指数 (TFI) 和水力不可逆污垢指数 (HIFI) 与 UV254 和 DOC 呈中度相关，而与组分 2 (C2) 和组分 3 (C3) 的 F-max 显着相关。此外，在结垢指数（TFI 和 HIFI）与组分 1 (C1) 的 F-max 之间没有观察到显着相关性。膜不可逆污染是由于膜表面以蛋白质类物质为主的滤饼层的积累造成的。太阳能激活的 PDS 预处理可有效降解类蛋白质物质和陆地来源的类腐殖质物质，以控制超滤膜污染。这些发现有利于开发基于太阳辐射和 PDS 氧化的膜污染减轻新策略。 (C) 2020 Elsevier Ltd. 保留所有权利。
Solar energy is considered one of the most promising energy sources for the degradation of pollutants in the water treatments. An innovative solar photo-thermochemical system involving peroxydisulfate (PDS) as an oxidant and xenon lamp as a solar irradiation light source was applied with hopes to degrade organic matters and alleviate the ultrafiltration (UF) membrane fouling when treating the real surface water. Moreover, heat-activated PDS pretreatment was used as a comparison to explore the respective proportions of solar light and heating effects, finding that solar light effect dominated the activation of PDS to degrade natural organic matters (NOMs) when the reaction temperature was below 50 degrees C and they both contributed to the production of free radicals at the temperature of > 50 degrees C. The results indicated that solar-activated PDS pretreatment significantly alleviated membrane fouling caused by Songhua River water with the highest transmembrane pressure (TMP) reduction of approximately 69.6% at 70 degrees C. Organic substances (characterized by DOC, UV254 and the maximum florescent intensity) and micropollutant (atrazine) in the feed water were better degraded in the presence of solar light. Both total fouling index (TFI) and hydraulic irreversible fouling index (HIFI) were moderate correlated with the UV254 and DOC, whereas remarkably correlated with the F-max of component 2 (C2) and component 3 (C3). In addition, no significant correlation was observed between fouling indexes (TFI and HIFI) and the F-max of component 1 (C1). The membrane irreversible fouling was attributed to the accumulation of cake layers mainly composed of protein-like substances on the membrane surface. Solar-activated PDS pretreatment would efficiently degrade the protein-like substances and terrestrially derived humic-like matters to control UF membrane fouling. The findings are beneficial to develop new strategies for membrane fouling alleviation based on the solar irradiation and PDS oxidation. (C) 2020 Elsevier Ltd. All rights reserved.