College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, 161006, China; Urban Water Resources Development and Northern National Engineering Research Center, Harbin, 150090, China; School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, 161006, China.
Chemosphere. 2022 Jun;297:134214. doi: 10.1016/j.chemosphere.2022.134214. Epub 2022 Mar 4.
As a special type of wastewater produced in the landfill, leachate is mainly composed of organic pollutants, inorganic salts, ammonia nitrogen and heavy metals, and featured by high pollutants concentration, complex composition and large fluctuations in water quality and volume. Biological, chemical and physical methods have been proposed to treat landfill leachate, but much attention has been paid to the advanced oxidation processes (AOPs), due to their high adaptability and organic degradation efficiency. This paper summarizes the recent findings on the AOPs based on hydroxyl radical (OH) (e.g., ozonation and catalyzed ozone oxidations, Fenton and Fenton-like oxidations) and sulfate radical (SO) (e.g., activated and catalyzed persulfate oxidations), especially the production routes of free radicals and mechanisms of action. When dealing with some special landfill leachates, it is difficult for a single advanced oxidation technology to achieve the expected results, but the synergistic combination with biological or physical methods can produce satisfactory outcomes. Therefore, this paper has summarized the application of these combined treatment technologies on landfill leachate.
作为垃圾填埋场中产生的一种特殊类型的废水，渗滤液主要由有机污染物、无机盐、氨氮和重金属组成，具有污染物浓度高、成分复杂、水质水量变化大等特点。生物、化学和物理方法已被提出用于处理垃圾渗滤液，但高级氧化工艺（AOPs）由于其高适应性和有机降解效率而受到更多关注。本文总结了基于羟基自由基（OH）（例如臭氧氧化和催化臭氧氧化、芬顿和类芬顿氧化）和硫酸根自由基（SO）（例如活化和催化过硫酸盐氧化）的 AOPs 的最新研究结果，特别是自由基的生成途径和作用机制。在处理一些特殊的垃圾渗滤液时，单一的高级氧化技术很难达到预期的效果，但与生物或物理方法的协同组合可以产生令人满意的结果。因此，本文总结了这些组合处理技术在垃圾渗滤液中的应用。
