Advanced oxidation process based on hydroxyl and sulfate radicals to degrade refractory organic pollutants in landfill leachate

Shuo Li; Yalun Yang; Heshan Zheng; Yongjie Zheng; Tao Jing; Jun Ma; Jun Nan; Yoong Kit Leong; Jo-Shu Chang

doi:10.1016/j.chemosphere.2022.134214

Advanced oxidation process based on hydroxyl and sulfate radicals to degrade refractory organic pollutants in landfill leachate

Chemosphere. 2022 Jun:297:134214. doi: 10.1016/j.chemosphere.2022.134214. Epub 2022 Mar 4.

Authors

Shuo Li¹, Yalun Yang², Heshan Zheng³, Yongjie Zheng², Tao Jing², Jun Ma⁴, Jun Nan⁴, Yoong Kit Leong⁵, Jo-Shu Chang⁶

Affiliations

¹ 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.
² College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, 161006, China.
³ College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, 161006, China. Electronic address: 787672849@qq.com.
⁴ Urban Water Resources Development and Northern National Engineering Research Center, Harbin, 150090, China; School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
⁵ Department of Chemical and Materials Engineering, Tunghai University, Taichung, 407, Taiwan.
⁶ Department of Chemical and Materials Engineering, Tunghai University, Taichung, 407, Taiwan; Department of Chemical Engineering, National Cheng Kung University, Tainan, 701, Taiwan; Research Center for Energy Technology and Strategy Center, National Cheng Kung University, Tainan, 701, Taiwan. Electronic address: changjs@mail.ncku.edu.tw.

PMID: 35257707
DOI: 10.1016/j.chemosphere.2022.134214

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.

Keywords: Advanced oxidation processes; Hydroxyl radical; Landfill leachate; Sulfate radical.

Publication types

Review

MeSH terms

Environmental Pollutants*
Hydrogen Peroxide
Hydroxyl Radical
Oxidation-Reduction
Sulfates / chemistry
Water Pollutants, Chemical* / analysis

Substances

Environmental Pollutants
Sulfates
Water Pollutants, Chemical
sulfate radical
Hydroxyl Radical
Hydrogen Peroxide