A potential novel approach for in situ chemical oxidation based on the combination of persulfate and dithionite

被引:25
|
作者
Liu, Yunde [1 ,2 ]
Zhang, Yuanzheng [3 ]
Zhou, Aiguo [1 ,2 ,3 ]
机构
[1] China Univ Geosci, Sch Environm Studies, Wuhan 430074, Hubei, Peoples R China
[2] China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China
[3] China Univ Geosci, Geol Survey Inst, Wuhan 430074, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
In situ chemical oxidation (ISCO); Persulfate; Groundwater; Sulfate radical; ORGANIC CONTAMINANTS; ENHANCED DEGRADATION; SYSTEM ROLE; ACTIVATION; SULFATE; SULFITE; MECHANISM; RADICALS; REMOVAL; WATER;
D O I
10.1016/j.scitotenv.2019.133635
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Although persulfate (PS) activation has been commonly applied to remove organic:contaminants on the subsurface, it is valuable to further explore PS activation methods. In this study, a novel combined process based on PS coupled with dithionite was investigated using trichloroethene (TCE) as a typical organic contaminant. PS/dithionite was demonstrated to be an effective system for TCE degradation depending on the operating parameters such as the initial PS and dithionite dosages. The optimal molar ratio of PSidithioniteffa was 5/5/1. Sulfate radicals (SO4 center dot(-)) were the dominant reactive species responsible for TCE degradation in the PS/dithionite system. Two pathways for SO4 center dot(-) generation were proposed in the PS/dithionite system. The generation of SO4 center dot(-) increased in the presence of oxygen but was still effective in an anaerobic environment.This study is the first to report a novel combined process based on PS coupled with dithionite, which is expected to be an efficient and environmentally friendly approach for in situ chemical oxidation (ISCO) remediation of contaminated soil and groundwater, whether in aerobic or anaerobic environments. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页数:6
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