Research progress on advanced treatment technology based on persulfate oxidation process for landfill leachate

WANG Dawei; LI Yingying; JIANG Yilan; CHEN Lin; GAO Keyi; XIONG Yiran

doi:10.13205/j.hjgc.202503004

Volume 43 Issue 3

Mar. 2025

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WANG Dawei, LI Yingying, JIANG Yilan, CHEN Lin, GAO Keyi, XIONG Yiran. Research progress on advanced treatment technology based on persulfate oxidation process for landfill leachate[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(3): 42-56. doi: 10.13205/j.hjgc.202503004

Citation:

WANG Dawei, LI Yingying, JIANG Yilan, CHEN Lin, GAO Keyi, XIONG Yiran. Research progress on advanced treatment technology based on persulfate oxidation process for landfill leachate[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(3): 42-56. doi: 10.13205/j.hjgc.202503004

Citation:

WANG Dawei, LI Yingying, JIANG Yilan, CHEN Lin, GAO Keyi, XIONG Yiran. Research progress on advanced treatment technology based on persulfate oxidation process for landfill leachate[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(3): 42-56. doi: 10.13205/j.hjgc.202503004

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Research progress on advanced treatment technology based on persulfate oxidation process for landfill leachate

doi: 10.13205/j.hjgc.202503004

WANG Dawei^{1,2
,
,},
LI Yingying^1,2,
JIANG Yilan^1,2,
CHEN Lin^1,2,
GAO Keyi^1,2,
XIONG Yiran^1,2

1. College of Environment, Hohai University, Nanjing 210098, China;
2. Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, China

Received Date: 2024-12-24
Accepted Date: 2024-12-30
Rev Recd Date: 2024-12-27

Available Online: 2025-06-07

Publish Date: 2025-03-01

Abstract

Abstract

Landfill leachate represents a complex wastewater matrix characterized by elevated organic loads， high concentrations of ammonia nitrogen， toxic heavy metal ions， and emerging persistent organic pollutants. Its generation is increasing annually， posing an ongoing threat to both ecosystems and human health. The advancement of conventional biological and physical treatment methods is hindered by the intricate components of the wastewater and the rising demands for effective treatment solutions. Due to the low hydraulic load， it is difficult for biological methods to achieve the expected results， when dealing with aged landfill leachate containing toxic and persistent organic pollutants. Physical methods are less affected by water quality fluctuations， but coagulation， adsorption， and membrane treatment technologies can only achieve the transfer of pollutants and auxiliary secondary treatment is still required. Therefore， there is an urgent need to identify efficient strategies for landfill leachate treatment. Recent studies have highlighted that advanced oxidation processes utilizing persulfate exhibit rapid oxidation rates for organic contaminants along with a significant degree of mineralization. Furthermore， coupled processes leveraging enhanced resistance to interference have achieved simultaneous removal of ammonia nitrogen， showcasing substantial potential in the domain of landfill leachate management. The advanced oxidation process based on persulfate decomposes the peroxide bonds in persulfate molecules through energy and electron transfer reactions， generating a rich variety of reactive oxygen species with high oxidation potential in situ. Through free radical pathways， it achieves efficient degradation of pollutants and has higher selectivity and oxidation efficiency for pollutants containing unsaturated bonds or aromatic rings， expanding the applicability range of pH. In addition， it can also synergistically degrade pollutants through non-free radical pathways， with stronger resistance to interference from water quality components. PS-AOPs are reported for the treatment of landfill leachate with high activity， high stability， low secondary pollution， and a wide range of applications， demonstrating the potential of being an ideal landfill leachate advanced treatment technology. This paper elucidated the activation mechanisms underlying persulfate-based advanced oxidation processes as well as their performance and operational mechanisms in landfill leachate treatment. Specifically， it examined the contributions from free radical oxidation pathways predominantly driven by sulfate radicals and hydroxyl radicals alongside non-free radical pathways mediated by singlet oxygen. A comprehensive overview of current research on persulfate-based advanced oxidation systems and their coupled configurations for landfill leachate treatment was systematically presented herein. In addition， the degradation of pollutants and the generation of by-products， which pose a secondary pollution risk to the system and environment in the advanced treatment process of landfill leachate， were discussed. Finally， this study discussed the existing challenges and prospective research directions pertaining to persulfate-driven approaches for landfill leachate treatment， which may provide support to the development of advanced treatment technology based on persulfate related advanced oxidation process for landfill leachate.
- landfill leachate,
- advanced oxidation process,
- persulfate,
- free radical pathway,
- non-free radical pathway

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References(91)

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