Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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A Continuous Process of Persulfate Oxidation and Citric acid Washing for the Treatment of Complex-Contaminated Soil Containing Total Recoverable Petroleum Hydrocarbons and Heavy Metals

TRPHs - 중금속 복합오염토양의 동시 처리를 위한 과황산 산화 - 구연산 세척 혼성공정 개발

  • Yoon, Na Kyeong (School of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University) ;
  • Choi, Jiyeon (School of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University) ;
  • Shin, Won Sik (School of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University)
  • 윤나경 (경북대학교 건설환경에너지공학부) ;
  • 최지연 (경북대학교 건설환경에너지공학부) ;
  • 신원식 (경북대학교 건설환경에너지공학부)
  • Received : 2017.09.08
  • Accepted : 2018.01.15
  • Published : 2018.01.31
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Abstract

A continuous process of persulfate oxidation and citric acid washing was investigated for ex-situ remediation of complex contaminated soil containing total recoverable petroleum hydrocarbons (TRPHs) and heavy metals (Cu, Pb, and Zn). The batch experiment results showed that TRPHs could be degraded by $Fe^{2+}$ activated persulfate oxidation and that heavy metals could be removed by washing with citric acid. For efficient remediation of the complex contaminated soil, two-stage and three-stage processes were evaluated. Removal efficiency of the two-stage process (persulfate oxidation - citric acid washing) was 83% for TRPHs and 49%, 53%, 24% for Cu, Zn, and Pb, respectively. To improve the removal efficiency, a three-stage process was also tested; case A) water washing - persulfate oxidation - citirc acid washing and case B) persulfate oxidation - citric acid washing (1) - citric acid washing (2). In case A, 63% of TRPHs, 73% of Cu, 60% of Zn, and 55% of Pb were removed, while the removal efficiencies of TRPHs, Cu, Pb, and Zn were 24%, 68%, 62%, and 59% in case B, respectively. The results indicated that case A was better than case B. The three-stage process was more effective than the two-stage process for the remediation of complex-contaminated soil in therms of overall removal efficiency.

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References

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