• Deriving Optimal Conditions of Hydrothermal Reaction for Stabilizing Heavy Metals in Contaminated Dredged Soil

  • Lee Sun-Ju1·An Hyeon-Kyu2·Cho Woori1·Kim Su-Hee1·Lee Jai-Young1*

  • 1Department of Environmental Engineering, University of Seoul, Seoul 02504, Korea
    2Environment Management Corporation, Gyeonggi-Do 13901, Korea

  • 오염준설토의 중금속 안정화를 위한 Hydrothermal Reaction의 최적 조건 도출

  • 이선주1·안현규2·조우리1·김수희1·이재영1*

  • 1서울시립대학교 환경공학부
    2환경시설관리주식회사

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Hydrothermal Reaction (HTR) was applied for the stabilization of contaminated soil with heavy metals, and then the test determined the optimal conditions for HTR. After HTR, the concentration of heavy metals in the contaminated soil increased. However, it was observed that the leachability potential significantly decreased as determined by TCLP and SPLP tests. This decrease was attributed to a decline in fractions 1-2 and an increase in fractions 3-4 as revealed by sequential extraction procedure. Due to the mineralogical characteristics of the dredged soil, distinct changes were not evident in the five-stage fraction. Therefore, it is deemed necessary to understand the chemical and mineralogical characteristics of the target soil for HTR application in order to selectively address contaminants. Comparison among operating conditions determined the optimal condition to be at 240oC for one hour.


Keywords: Dredged soil, Hydrothermal reaction, Stabilization, Heavy metals

This Article

  • 2024; 29(1): 63-71

    Published on Feb 29, 2024

  • 10.7857/JSGE.2024.29.1.063
  • Received on Jan 8, 2024
  • Revised on Jan 17, 2024
  • Accepted on Feb 26, 2024

Correspondence to

  • Lee Jai-Young

  • Department of Environmental Engineering, University of Seoul, Seoul 02504, Korea

  • E-mail: leejy@uos.ac.kr