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钴基光芬顿蒸馏膜处理实际垃圾渗滤液应用研究

作者：卢振宇，杨麒臻，蒋宇铃，瞿芳术，鄢忠森

单位： 1. 福州大学土木工程学院，福州 350108；2. 福州水务集团有限公司，福州 350001；3. 广州大学土木工程学院，广州 510006

关键词：膜蒸馏；垃圾渗滤液；光芬顿；膜污染；自清洁

DOI号：

分类号： TQ028;X52

出版年,卷(期):页码： 2024,44(3):106-114

摘要：

垃圾渗滤液包含高浓度污染物质，对人类健康和生态环境构成威胁。尽管膜蒸馏（MD）具有截留效率高和操作压力低等优点，在垃圾渗滤液的处理中展现出一定的潜力。然而在MD的实际应用过程中，有机物和无机物引起的络合污染降低了水的净化效率，从而限制了其潜在的应用。为了解决这一难题，本研究将基于硫酸盐自由基的高级氧化技术（SR-AOPs）集成到MD技术中，以加强膜污染的控制。本研究采用直接水热法结合真空过滤合成了四氧化三钴/氮修饰的碳量子点/聚偏氟乙烯（Co3O4/NCDs/PVDF，简称CN-PVDF）光芬顿蒸馏膜，并首次用于直接接触式膜蒸馏（DCMD）中处理垃圾渗滤液。在1.9 kW/m2的可见光照射下，其活化20 mmol/L的过氧一硫酸盐（PMS），能够缓解DCMD处理实际垃圾渗滤液废水过程的膜污染，减少Ca2+、Mg2+和有机物在膜面的沉积。此外，CN-PVDF膜能实现光芬顿自清洁效果，经清洗后膜比通量由0.449显著恢复至0.928。本研究为MD膜抗污染能力提升提供了新的思路。

Landfill leachate contains all kinds of harmful substances, which pose a threat to human health and ecological environment. Although membrane distillation (MD) has the advantages of high interception efficiency and low operating pressure, it shows certain potential in the treatment of landfill leachate. However, in the practical application of MD, the membrane complexation fouling caused by organic and inorganic substances reduces the efficiency of water purification, thus limiting its potential application. To solve this problem, this study integrated sulfate radical based advanced oxidation process (SR-AOPs) into MD technology to enhance the control of membrane fouling. Co3O4/NCDs/PVDF (CN-PVDF) photo-Fenton distillation membrane was synthesized by direct hydrothermal method combined with vacuum filtration, and it was first used in direct contact membrane distillation (DCMD) to treat landfill leachate. Under visible light irradiation of 1.9kW/m2 and activation of 20 mmol/Lol/L peroxymonosate (PMS), which could alleviate membrane fouling during DCMD treatment of actual landfill leachate wastewater, and reduce the deposition of Ca2+, Mg2+, and organic matter on the membrane surface during water production. In addition, CN-PVDF membrane can realize the self-cleaning effect of photo-Fenton, and the specific flux of CN-PVDF membrane can recover significantly from 0.449 to 0.928 after cleaning. In conclusion, this study proposes an innovative method to improve the anti-pollution ability of MD membranes.

基金项目：

国家自然科学基金资助项目（52370069，52000034），广东省自然科学基金杰出青年项目（2023B1515020057）

作者简介：

卢振宇（1997-），男，福建福州人，硕士，从事膜蒸馏废水处理技术研究

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