Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 278, Issue -, Pages 610-619Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.05.093
Keywords
MSWI bottom ash; Glass; Toxic elements; Gel; Weathering; Landfill
Categories
Funding
- National Natural Science Foundation of China [51308564, 21107147]
- Central University Basic Scientific Research Foundation of Building Division at Chongqing University [106112013CDJZR210004]
- 111Project [B13041]
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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 10(0)-10(2) mu m 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 Al-Si gel, Ca-Al-Si gel, Fe-Al-Si 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 MS WI-BA glass phases. (C) 2014 Elsevier B.V. All rights reserved.
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