Advanced oxidation process based on hydroxyl and sulfate radicals to degrade refractory organic pollutants in landfill leachate. (June 2022)

• Record Type: Journal Article
• Authors: Li, Shuo; Yang, Yalun; Zheng, Heshan; Zheng, Yongjie; Jing, Tao; Ma, Jun; Nan, Jun; Leong, Yoong Kit; Chang, Jo-Shu
• Is Part Of: Chemosphere. Volume 297(2022)
• Publication Date: 2022-06
• Subjects: Landfill leachate -- Advanced oxidation processes -- Sulfate radical -- Hydroxyl radical; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.134214
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: 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 (SO4 − ) (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. Graphical abstract: Image 1 Highlights: Landfill leachate treatment with hydroxyl and sulfate radicals-based AOPs is reviewed. The combination of AOPs with biological and physical technologies is summarized. The mechanisms and parameters of various AOPs and combined technologies are discussed.