Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Control of Persulfate Activation Rate and Improvement of Active Species Transfer Rate Using Selenium-modified ZVI

셀레늄으로 개질된 영가철을 이용한 과황산 활성화 속도 조절 및 활성종 전달율 향상에 관한 연구

  • Hee-won Kwon (Department of Environmental Engineering, Andong National University) ;
  • Hae-Seong Park (Department of Environmental Engineering, Andong National University) ;
  • In-seong Hwang (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Jeong-Jin Kim (Department of Earth and Environmental Sciences, Andong National University) ;
  • Young-Hun Kim (Department of Environmental Engineering, Andong National University)
  • 권희원 (국립안동대학교 환경공학과) ;
  • 박해성 (국립안동대학교 환경공학과) ;
  • 황인성 (부산대학교 토목환경공학과) ;
  • 김정진 (국립안동대학교 지구환경과학과) ;
  • 김영훈 (국립안동대학교 환경공학과)
  • Received : 2022.12.19
  • Accepted : 2023.01.11
  • Published : 2023.01.31
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Abstract

The advanced oxidation treatment using persulfate and zero-valent iron (ZVI) has been evaluated as a very effective technology for remediation of soil and groundwater contamination. However, the high rate of the initial reaction of persulfate with ZVI causes over-consumption of an injected persulfate, and the excessively generated active species show a low transfer rate to the target pollutant. In this study, ZVI was modified using selenium with very low reactivity in the water environment with the aim of controlling the persulfate activation rate by controlling the reactivity of ZVI. Selenium-modified ZVI (Se/ZVI) was confirmed to have a selenium coating on the surface through SEM/EDS analysis, and low reductive reactivity to trichlroethylene (TCE) was observed. As a result of inducing the persulfate activation using the synthesized Se/ZVI, the persulfated consumption rate was greatly reduced, and the decomposition rate of the model contaminant, anisole, was also reduced in proportion. However, the final decomposition efficiency was rather increased, which seems to be the result of preventing persulfate over-consumption. This is because the transfer efficiency of the active species (SO4-∙) of persulfate to the target contaminant has been improved. Selenium on the surface of Se/ZVI was not significantly dissolved even under oxidation conditions by persulfate, and most of it was present in the form of Se/ZVI. It was confirmed that the persulfate activation rate could be controlled by controlling the reactivity of ZVI, which could greatly contribute to the improvement of the persulfate oxidation efficiency.

Keywords

Acknowledgement

본 연구는 환경산업기술원의 연구비 지원(KEITI 2019002480004)으로 수행되었습니다.

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