Dechlorination of liquid wastes containing chlorinated hydrocarbons by a binder mixture of cement and slag with Fe(II)

Bahngmi Jung, Ja Won Shin, Praveen A. Ghorpade, Joo Yang Park

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6 Citations (Scopus)

Abstract

Iron-based degradative solidification/stabilization (DS/S-Fe(II)) is a modification of conventional solidification/stabilization (S/S) that incorporates degradative processes for organic contaminant destruction with immobilization. This study investigated the effectiveness of a binder mixture of Portland cement and slag in a DS/S-Fe(II) system to treat trichloroethylene (TCE), 1,1-dichloroethylene (1,1-DCE), vinyl chloride (VC), trichloromethane (CF), and dichloromethane (MC), which are major chlorinated hydrocarbons contained in waste oils and waste organic solvents. For TCE, 1,1-DCE, and VC, degradation experiments were conducted using three different binder combinations with Fe(II) (cement/Fe(II), slag/Fe(II), and cement/slag/Fe(II)). When cement and slag were mixed at a 1:1 ratio (% wt), the TCE and 1,1-DCE dechlorination rate was enhanced compared to that when cement or slag was used alone with Fe(II). Also, batch experiments were conducted in the solid phase consisting of cement, slag, sand, and Fe(II) to treat liquid wastes that contain chlorinated compounds at high concentrations. TCE was completely removed after 5. days in the cement/slag/sand/Fe(II) system, in which the initial TCE concentration was 11.8. mM, with Fe(II) concentration of 565. mM. While the CF concentration was decreased by 95% after 5. days when the initial CF and Fe(II) concentration was 0.25. mM and 200. mM, respectively. However, MC was not degraded with the cement/slag/Fe(II) system.

Original languageEnglish
Pages (from-to)443-450
Number of pages8
JournalScience of the Total Environment
Volume449
DOIs
Publication statusPublished - 1 Apr 2013

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Keywords

  • Cement
  • Chlorinated hydrocarbons
  • Degradative solidification/stabilization
  • Ferrous iron
  • Liquid wastes
  • Slag

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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