Geoenvironmental weathering/deterioration of landfilled MSWI-BA glass

Yunmei Wei, Amirhomayoun Saffarzadeh, Takayuki Shimaoka, Chun Zhao, Xuya Peng, Junmin Gao

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Municipal solid waste incineration bottom ash (MSWI-BA) glass serves as a matrix of assorted bottom ash (BA) compounds. Deterioration of the BA glass phases is quite important as they regulate the distribution of a series of toxic elements. This paper studied landfilled MSWI-BA samples from the mineralogical and geochemical viewpoint to understand the deterioration behavior of the BA glass phases as well as mechanisms involved. Bulk analysis by PXRD as well as micro-scale analysis by optical microscopy and SEM/EDX was conducted for such purposes. The results revealed that dissolution of the BA glass phases has resulted in a deterioration layer of 100-102μm thickness after years of disposal. This rapid weathering process is highly relevant to the specific glass characteristics and solution pH. The BA glass phases with more embedded compounds and cracks/fissures tend to be more vulnerable. Moreover, the generally alkaline pH in ash deposit favors a rapid disruption of the glass phase. The weathering products are mainly gel phases (including AlSi gel, CaAlSi gel, FeAlSi gel etc.) with iron oxide/hydroxide as accessory products. Breakdown of the BA glass phases triggers chemical evolution of the embedded compounds. Based on all the findings above, a model is proposed to illustrate a general evolution trend for the landfilled MSWI-BA glass phases.

Original languageEnglish
Pages (from-to)610-619
Number of pages10
JournalJournal of Hazardous Materials
Volume278
DOIs
Publication statusPublished - Aug 15 2014

Fingerprint

Ashes
Coal Ash
Incineration
Waste Disposal Facilities
Solid Waste
bottom ash
Waste incineration
Municipal solid waste
Weathering
incineration
municipal solid waste
Glass
Deterioration
weathering
glass
gel
Gels
Chemical Evolution
Poisons
Accessories

All Science Journal Classification (ASJC) codes

  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Environmental Chemistry
  • Environmental Engineering
  • Medicine(all)

Cite this

Geoenvironmental weathering/deterioration of landfilled MSWI-BA glass. / Wei, Yunmei; Saffarzadeh, Amirhomayoun; Shimaoka, Takayuki; Zhao, Chun; Peng, Xuya; Gao, Junmin.

In: Journal of Hazardous Materials, Vol. 278, 15.08.2014, p. 610-619.

Research output: Contribution to journalArticle

Wei, Yunmei ; Saffarzadeh, Amirhomayoun ; Shimaoka, Takayuki ; Zhao, Chun ; Peng, Xuya ; Gao, Junmin. / Geoenvironmental weathering/deterioration of landfilled MSWI-BA glass. In: Journal of Hazardous Materials. 2014 ; Vol. 278. pp. 610-619.
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