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Evaluation of the Risk Reduction of Heavy Metal-Contaminated Soil Treated by Bottom Ash-Based Zeolite

  • Journal of Environmental Impact Assessment
  • Abbr : J EIA
  • 2025, 34(2), pp.83~92
  • Publisher : Korean Society Of Environmental Impact Assessment
  • Research Area : Engineering > Environmental Engineering
  • Received : March 19, 2025
  • Accepted : March 27, 2025
  • Published : April 30, 2025

YuLim Choi 1 JaeWon Shin 1 SaeHyun Kim 1 JiYe Jung 1 Sunghyun Kim 1 SangYoon Min 1 YoonYoung Chang 1

1광운대학교

Accredited

ABSTRACT

This study examines the synthesis of zeolite from bottom ash of thermal power plants andevaluates its effectiveness as a soil treatment for reducing the hazards associated with heavy metal contaminated soils. Zeolite synthesis was conducted using three different methods: the one-stepmethod, two-step method, and fusion method. The characteristics of the synthesized zeolites, alongwith their performance in batch adsorption experiments and soil cultivation tests with heavy metalcontaminated soil, were examined. According to the XRD analysis results, the zeolite synthesized bythe fusion method was confirmed to form Na-A type zeolite, which exists in relatively higherproportion compared to the quartz and mullite in bottom ash. The Fusion method exhibited the highestCEC and surface area due to the formation of greater amount of Na-A zeolite during the synthesisprocess compared to other synthesis methods. Soil cultivation experiments were conducted usingauthentic heavy metal(Cd, Cu, Pb, Zn) contaminated soil collected from the smelter site. Theperformance of reduction of heavy metal mobility and hazardous was evaluated through TCLP and1 M NH4NO3 extraction tests. According to the results of soil cultivation experiments, Fusion methodshowed the highest sterilization efficiency due the ion exchange by high CEC of Na-A zeolite andchemical adsorption by surface oxygen-containing functional groups.

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