In-situ Fenton oxidation experiment of compound benzene pollutants in high salt and strong acid groundwater

GUO Wei; YUAN Fang; ZHANG Jia; XIE Bin; FENG Xueyang; CHEN Honghan

doi:10.16030/j.cnki.issn.1000-3665.202012021

2021 Vol. 48, No. 2

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GUO Wei, YUAN Fang, ZHANG Jia, XIE Bin, FENG Xueyang, CHEN Honghan. In-situ Fenton oxidation experiment of compound benzene pollutants in high salt and strong acid groundwater[J]. Hydrogeology & Engineering Geology, 2021, 48(2): 182-189. doi: 10.16030/j.cnki.issn.1000-3665.202012021

Citation:

GUO Wei, YUAN Fang, ZHANG Jia, XIE Bin, FENG Xueyang, CHEN Honghan. In-situ Fenton oxidation experiment of compound benzene pollutants in high salt and strong acid groundwater[J]. Hydrogeology & Engineering Geology, 2021, 48(2): 182-189. doi: 10.16030/j.cnki.issn.1000-3665.202012021

In-situ Fenton oxidation experiment of compound benzene pollutants in high salt and strong acid groundwater

1.
Beijing Key Laboratory of School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing　100083, China
2.
Ecological Environment Monitoring Station, Zhongwei, Ningxia　755000, China

More Information

Corresponding author: CHEN Honghan, chenhh@cugb.edu.cn

Received Date: 11 December 2020

Revised Date: 31 January 2021

Publish Date: 15 March 2021

Abstract

Abstract

In the process of in-situ oxidation, the physical and chemical characteristics of actual ground water and water-bearing media are the important factors affecting the oxidation effect, but there are few specific studies on this effect at present. The actual high-salt and strong-acid compound benzene contaminated groundwater in a certain site is used as the research object, and 2-nitro-4-methoxyaniline (2-N) and 3-nitro-4-methoxyaniline (3-N) in groundwater are characteristic pollutants. The in-situ oxidation characteristics of Fenton’s reagent are explored, and the liquid environmental factors (initial H₂O₂ concentration, initial Fe²⁺ concentration, initial pH value, initial acetic acid (HAc) concentration, initial ${\rm{SO}}_4^{2-} $ < img text_id='' class='formula-img' style='display:none;' src='202012021_Z-20210310112508.png'/ > < img text_id='' class='formula-img' style='display:none;' src='202012021_Z-20210310112515.png'/ > < img text_id='' class='formula-img' style='display:none;' src='202012021_Z-20210310112515.png'/ > < img text_id='' class='formula-img' style='display:none;' src='202012021_Z-20210310112515.png'/ > < img text_id='' class='formula-img' style='display:none;' src='202012021_Z-20210310112515.png'/ > concentration) and aquifer media on the removal of 2-N and 3-N by Fenton method are examined. The results show that (1) the Fenton method has a significant effect on removal of 2-N and 3-N, and when the initial liquid phase conditions are c(H₂O₂)=7 mmol/L, c(Fe²⁺)=4 mmol/L, pH=4, c(HAc)=0 mg/L and c( ${\rm{SO}}_4^{2-} $ < img text_id='' class='formula-img' style='display:none;' src='202012021_Z-20210310112508.png'/ > < img text_id='' class='formula-img' style='display:none;' src='202012021_Z-20210310112515.png'/ > < img text_id='' class='formula-img' style='display:none;' src='202012021_Z-20210310112515.png'/ > < img text_id='' class='formula-img' style='display:none;' src='202012021_Z-20210310112515.png'/ > < img text_id='' class='formula-img' style='display:none;' src='202012021_Z-20210310112515.png'/ > )=0 mmol/L, the removal effect is the best. (2) Each factor affects the oxidation of 2-N and 3-N by the Fenton method. The effect of the addition of H₂O₂ and Fe²⁺ increases the removal rate of 2-N and 3-N. Increase in the concentration of HAc decreases the removal rate of 2-N and 3-N. (3) The groundwater medium has a strong effect on 2-N and 3-N, and the adsorption of 3-N is stronger than that of 2-N. In this experiment, the two largest adsorption states accounte for 29 % and 42 %, respectively. The existence of the adsorption state will inhibit the Fenton method to 2-N. (4) The mineral analysis results show that the medium contains a small amount of pyrite. In a sulfuric acid environment, the medium corrodes and dissolves to release Fe²⁺. Therefore, the Fenton reaction can be completed without additional Fe²⁺ to remove 2-N and 3-N.
- Fenton /
- in situ oxidation /
- 2-nitro-4-methoxyaniline /
- 3-nitro-4-methoxyaniline /
- groundwater pollution /
- aqueous medium

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References

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