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2021 Vol.26, Issue 6 Preview Page
Effect of Neutralization of Red Mud on Arsenic Stabilization in Soils

레드머드 중화 방법에 따른 토양 중 비소의 안정화 특성 평가

Jio Woo1
,
Eun Jung Kim1*
우지오 1
,
김은정 1*
1 Department of Environmental Engineering, Mokpo National University, Jeollanam-do 58554, Korea
1 국립목포대학교 환경공학과
*Corresponding Author
31 December 2021. pp. 65-73
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Abstract

Since the amount of red mud, generated from aluminum smelting process as a by-product, has increased worldwide, the recycle and metal resource recovery from the red mud is becoming more important. In this study, in order to recycle the red mud as a soil stabilizer to remediate arsenic contaminated soils, neutralization of red mud was investigated. Red mud was neutralized by washing with distilled water and NaCl, CaCl 2 , FeCl 3 , and HCl solutions and heating at 200-800 o C, and arsenic stabilization characteristics in soils were evaluated with the neutralized red mud. Although washing with distilled water was not effective in neutralizing red mud, the application of the washed red mud to soils lowered the soil pH compared to the application of untreated red mud. Among NaCl, CaCl 2 , FeCl 3 , and HCl solutions, washing with FeCl 3 showed the most effective in lowering pH of the red mud from pH 10.73 to pH 4.26. Application of the neutralized red mud in soils resulted in quite different arsenic stabilization efficiency depending on soil samples. In M1 soil, which showed relatively high arsenic stabilization efficiency by untreated red mud, the neutralization of red mud resulted in little effect on arsenic stabilization in soil. On the other hand, in M2 soil, which showed low arsenic stabilization efficiency by untreated red mud, the neutralization of red mud increased arsenic stabilization significantly. Soil characteristics such as clay minerals and pH buffering capacity seemed to affect reactions between red mud and soils, which resulted in different effects of the red mud application on soil pH and arsenic stabilization efficiencies.

Keywords
Red mud
Neutralization
Soil
Arsenic
Stabilization
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 : 26
  • No :6
  • Pages :65-73
  • Received Date : 2021-11-18
  • Revised Date : 2021-11-22
  • Accepted Date : 2021-12-13
  • DOI :https://doi.org/10.7857/JSGE.2021.26.6.065
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