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2023 Vol.28, Issue 1 Preview Page
Treatment of Phenol Contaminated Soil Using Sulfidated Zero-Valent Iron as a Persulfate Activator for Advanced Oxidation Process

황화영가철 기반의 과황산 고도산화공정을 이용한 페놀 오염토양 처리

Hyuk Sung Chung1
,
Nguyen Quoc Bien1
,
Jae Young Choi1
,
Inseong Hwang1*
정혁성 1
,
응우옌 쿠엔 비엔 1
,
최재영 1
,
황인성 1*
1Department of Civil & Environmental Engineering, Pusan National University
1부산대학교 사회환경시스템공학과
*Corresponding Author
28 February 2023. pp. 15-24
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Abstract

A persulfate(PS)/sulfidated microscale zero-valent iron(S-mZVI) system was tested for treating a soil contaminated with phenol. Sulfidation of bare mZVI was conducted using a mechanochemical process utilizing a ball mill in order to improve persulfate activation capacity and stability of unmodified mZVI. The synthesized S-mZVI performed markedly better than the bare mZVI in activating PS. The optimum molar ratio of sulfur to mZVI was around 0.12. In the soil slurry experiments, a very rapid and complete removal of phenol was observed at the optimum molar ratios of PS to S-mZVI of 2:1 and PS to phenol of 16:1. The phenol removal efficiencies decreased as the water content of the slurries decreased. This was believed to be due to increased soil oxidant demand as the amount of soil was increased as relative to the water content. To evaluate the field applicability of the process, slurry experiments adopting high soil contents were carried out that simulated in-situ soil mixing conditions. These experiments resulted in substantially compromised degradation efficiencies of 54.3% and 43.8% within 4 hours. The current study generally shows that the PS/S-mZVI process has a potential to be developed into a remediation technology for soils contaminated with organics.

Keywords
Advanced Oxidation Processes
Sulfidated zero-valent iron
Persulfate
Soil remediation
In-situ Soil Mixing
References

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Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 28
  • No :1
  • Pages :15-24
  • Received Date : 2023-02-08
  • Revised Date : 2023-02-13
  • Accepted Date : 2023-02-20
  • DOI :https://doi.org/10.7857/JSGE.2023.28.1.015
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