DOI: 10.1016/j.watres.2019.01.013
Scopus记录号: 2-s2.0-85060548170
论文题名: Re-evaluation of sulfate radical based–advanced oxidation processes (SR-AOPs) for treatment of raw municipal landfill leachate
作者: Chen C. ; Feng H. ; Deng Y.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 100
结束页码: 107
语种: 英语
英文关键词: Advanced oxidation processes
; Ammonia
; Chemical oxidation
; Dissolved organic matter
; Landfill leachate
; Sulfate radicals
Scopus关键词: Ammonia
; Biogeochemistry
; Biological materials
; Chemical oxygen demand
; Chlorine compounds
; Dissolution
; Efficiency
; Industrial wastes
; Nitrates
; Organic compounds
; Oxidation
; Petroleum reservoir evaluation
; Rhenium compounds
; Sulfur compounds
; Advanced Oxidation Processes
; Chemical oxidation
; Dissolved organic matters
; Landfill leachates
; Sulfate radicals
; Leachate treatment
; ammonia
; chloride
; chlorine
; dissolved organic matter
; hydrochloric acid
; nitrate
; nitrite
; nitrogen
; radical
; sulfate
; ammonia
; chemical compound
; chemical oxygen demand
; dissolved organic matter
; experimental study
; landfill
; leachate
; oxidation
; pollutant removal
; radical
; Article
; chemical oxygen demand
; evaluation study
; landfill leachate
; oxidation
; priority journal
; reaction analysis
; self concept
英文摘要: Sulfate radical (SO 4 [rad]- ) -based advanced oxidation processes (SR-AOPs) have proven effective for simultaneously removing refractory dissolved organic matter (DOM) and ammonia in municipal landfill leachates. However, the knowledge on the competition of leachate DOM and ammonia for SO 4 [rad]- , the utilization efficiency of persulfate, as well as the reaction pathways and final products of ammonia oxidation during the SR-AOP treatment remains little known, thereby leading to a lack of a comprehensive evaluation of the emerging leachate treatment technology. The objective of this study was to further investigate the performance of a thermally activated persulfate system for treatment of a mature landfill leachate and re-evaluate the benefits and restrictions of SR-AOPs for leachate treatment. The laboratory experimental results showed that removal patterns of chemical oxygen demand (COD) and ammonia relied heavily upon the dose of persulfate that could be thermally activated to produce reactive sulfate radicals, reflecting the competition of leachate DOM, ammonia, and non-target leachate constituents for SO 4 [rad]- . The utilization efficiency of the added persulfate could be more efficiently utilized for removing the two target leachate pollutants at a lower persulfate dose, whereas more persulfate was wasted due to the reactions with non-target leachate constituents (e.g. Cl − and CO 3 2− ) and/or self-decomposition with the increasing persulfate dose. During the treatment, ammonia was oxidized, via the direct attack of SO 4 [rad]- and/or by molecular chlorine produced from the reactions of chloride and sulfate radicals, into nitrate and nitrogen gas, while nitrite was not detected. Of importance, this study highlighted three potentially negative impacts of SR-AOPs on the quality of treated leachate, including accumulation of total dissolved solids, the production of undesirable nitrate, and the pH decrease due to the continuous formation of hydrochloric acid. Therefore, the three issues should be carefully evaluated when a SR-AOP is selected for leachate treatment. Because these impacts become less pronounced with a decreasing persulfate dose, SR-AOPs as a pre-treatment, which is achieved at a relatively low persulfate dose, may be an appropriate option for the SR-AOP application to leachate treatment. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121992
Appears in Collections: 气候变化事实与影响
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作者单位: School of Water Resources and Environment, Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences, Beijing, 100083, China; Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043, United States
Recommended Citation:
Chen C.,Feng H.,Deng Y.. Re-evaluation of sulfate radical based–advanced oxidation processes (SR-AOPs) for treatment of raw municipal landfill leachate[J]. Water Research,2019-01-01