Hydrothermal solidification behavior of municipal solid waste incineration bottom ash without any additives

Zhenzi Jing, Xinwei Fan, Lei Zhou, Junjie Fan, Yi Zhang, Xiaohui Pan, Emile Hideki Ishida

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Municipal solid waste incineration (MSWI) bottom ash could be solidified with and without slaked lime (calcium hydroxide) addition by a hydrothermal method under steam pressure of 1.56MPa at 200°C for up to 72h. Experimental results showed that CSH gel or tobermorite exerted a main influence on strength development, and without any additives CSH gel was easy to form, while slaked lime addition favored to form tobermorite. Tobermorite seemed to exert a larger effect on the strength development than CSH gel. Leaching results showed that the concentrations of heavy metals dissolved from the solidified specimens were effectively reduced after hydrothermal processing. The immobilization was mainly due to the tobermorite or CSH gel formation, and Pb2+ and Zn2+ seemed to be fixed more readily than Cr6+, which might be the reason that the structural Ca2+ within tobermorite or CSH gel was exchanged by Pb2+ and Zn2+ more easily than Cr6+. In addition, there existed a close relationship between leaching concentration and strength enhancement, and a higher strength seemed to exert a larger effect on immobilization of heavy metals.

Original languageEnglish
Pages (from-to)1182-1189
Number of pages8
JournalWaste Management
Volume33
Issue number5
DOIs
Publication statusPublished - 2013 May

Keywords

  • CSH gel
  • Hydrothermal solidification
  • Leaching behavior
  • MSWI bottom ash
  • Tobermorite

ASJC Scopus subject areas

  • Waste Management and Disposal

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