Enhanced elution of chloride ions from incinerator bottom ash

Gjergj Dodbiba*, Xiang Zhang, Yonggu Kim, Mauricio Córdova Udaeta, Josiane Ponou, Toyohisa Fujita

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Recycling of the incinerator bottom ash, which is discharged from solid waste treatment plants, is important since the landfilling capacity is limited, and if it is left untreated, it would generate a great environmental burden. Besides, the incinerator bottom ash has a similar chemical composition to that of cement and therefore it can be used as a substitute raw material in cement manufacturing. This recycling method would, in turn, reduce the consumption of natural resources, such as limestone and clay. Generally speaking, a high concentration of chloride leads to severe corrosion of steel, which can damage the reinforced concrete structure. The removal of chloride ions from the ash should, therefore, be carried out in advance to use it as a raw material for cement production. Thus, this study aims to find an effective method for eluting chloride ion from the incinerator bottom ash for recycling. One of the main findings of this work was that the residual chloride concentration in the incinerator bottom ash was reduced to 1.70 g/kg, eluting 87.78% of initial Cl concentration, when the ash was washed with an acetic acid solution (concentration: 1.5 mol/L) saturated with CO2 micro-bubbles.

Original languageEnglish
Pages (from-to)1686-1694
Number of pages9
JournalChemical Engineering Communications
Volume208
Issue number12
DOIs
Publication statusPublished - 2021
Externally publishedYes

Keywords

  • Acetic acid
  • CO micro-bubbles
  • chloride ions
  • elution
  • incinerator bottom ash
  • particle size distribution

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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