• 关键词：催化剂  光化学  垃圾渗滤液  高级氧化技术  类Fenton  施氏矿物

• 基金项目：国家自然科学基金（No.21477054，21277071）

• 王鹤茹
• 1. 中南财经政法大学信息与安全工程学院, 武汉 430073;2. 南京农业大学资源与环境科学学院环境工程系, 南京 210095

• 宋永伟
• 1. 中南财经政法大学信息与安全工程学院, 武汉 430073;2. 南京农业大学资源与环境科学学院环境工程系, 南京 210095

• 徐峙辉
• 南京农业大学资源与环境科学学院环境工程系, 南京 210095

• 崔春红
• 南京农业大学资源与环境科学学院环境工程系, 南京 210095

• 梁剑茹
• 南京农业大学资源与环境科学学院环境工程系, 南京 210095

• 周立祥
• 南京农业大学资源与环境科学学院环境工程系, 南京 210095

• 摘要：垃圾渗滤液是一种复杂有毒的、生化降解性差的高浓度有机废水，高级氧化技术具有氧化能力强和无二次污染等特点，被认为是处理难降解有机污染物最有应用前景的方法.本研究在500 W汞灯、25℃、2.5 h反应条件下，对比了TiO₂、K₂S₂O₈、K₂S₂O₈/Fe²⁺、施氏矿物、施氏矿物/H₂O₂、Fe²⁺/H₂O₂ 6种催化剂组合光化学处理垃圾渗滤液的效果.结果表明，施氏矿物/H₂O₂和Fe²⁺/H₂O₂光催化降解垃圾渗滤液中有机污染物的效果优于其它催化剂组合，渗滤液中COD去除率分别为41.6%和46.5%，TOC去除率分别为76.0%和78.1%.然而，Fe²⁺/H₂O₂组合在光催化处理垃圾渗滤液后会产生大量难以沉降的Fe（OH）₃絮状物，且渗滤液色度明显增加，由初始的40倍上升到175倍.而施氏矿物/H₂O₂组合则避免了上述问题，色度去除率达100%，被认为是一种具有应用前景的光化学降解垃圾渗滤液的催化剂组合.

• Abstract：Landfill leachate is a complex, high toxicity and non-biodegradable wastewater, and seeking efficient, low-cost technologies to treat it is urgently needed. Advanced Oxidation Processes are considered as the most promising methods to treat refractory organics because of the characteristics of strong oxidizing ability and no secondary pollution. In this study, different catalyst combinations (TiO₂, K₂S₂O₈, K₂S₂O₈/Fe²⁺, schwertmannite, schwertmannite/H₂O₂、Fe²⁺/H₂O₂) for photo catalytic processing of the leachate were contrasted at a same reaction condition of UV-500, 25℃ and 2.5 h. The results showed that the effect of photocatalytic degradation of organic pollutants in landfill leachate was significant by schwertmannite/ H₂O₂ and Fe²⁺/H₂O₂, COD removal efficiencies were 41.6% and 46.5%, respectively, and TOC removal efficiencies were 76.0% and 78.1%, respectively, which were far higher than the removal efficiencies of other catalytic combinations. However, after photochemical oxidation with Fe²⁺/H₂O₂, large number of Fe(OH)₃ witch were difficult to remove by settling were produced and the color of leachate were significantly increased from 40 to 175. By contrast, the combination of schwertmannite/H₂O₂ avoided secondary pollution and the color removal rate could reach 100%. Therefore, it's considered as a promising catalyst combination for the photochemical degradation of landfill leachate.

• Key words：catalyst  photochemical  landfill leachate  advanced oxidation processes  Fenton-like  schwertmannite

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