title: Geoenvironmental weathering/deterioration of landfilled MSWI-BA glass.
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 10(0)-10(2)μm 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 MSWI-BA glass phases.
authors.affiliation: Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, 174th, Shapingba Zhengjie Street, Shapingba District, Chongqing 400 045, PR China; National Center for International Research of Low-carbon and Green Buildings, Chongqing University, 174th, Shapingba Zhengjie Street,Shapingba District, Chongqing 400 045, PR China.
authors.forename: Yunmei
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819 0395, Japan.
authors.forename: Amirhomayoun
authors.initials: A
authors.lastname: Saffarzadeh
authors.affiliation: Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819 0395, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Shimaoka
authors.affiliation: Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, 174th, Shapingba Zhengjie Street, Shapingba District, Chongqing 400 045, PR China; National Center for International Research of Low-carbon and Green Buildings, Chongqing University, 174th, Shapingba Zhengjie Street,Shapingba District, Chongqing 400 045, PR China. Electronic address: wym_1982@cqu.edu.cn.
authors.forename: Chun
authors.initials: C
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, 174th, Shapingba Zhengjie Street, Shapingba District, Chongqing 400 045, PR China; National Center for International Research of Low-carbon and Green Buildings, Chongqing University, 174th, Shapingba Zhengjie Street,Shapingba District, Chongqing 400 045, PR China.
authors.forename: Xuya
authors.initials: X
authors.lastname: Peng
authors.affiliation: Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, 174th, Shapingba Zhengjie Street, Shapingba District, Chongqing 400 045, PR China; National Center for International Research of Low-carbon and Green Buildings, Chongqing University, 174th, Shapingba Zhengjie Street,Shapingba District, Chongqing 400 045, PR China.
authors.forename: Junmin
authors.initials: J
authors.lastname: Gao
mesh_terms: D005898:Glass / Q000032:analysis / Q000737:chemistry*; D017745:Incineration; D007220:Industrial Waste / Q000032:analysis; D064091:Waste Disposal Facilities
chemical_list: D007220:Industrial Waste
keywords: Gel; Glass; Landfill; MSWI bottom ash; Toxic elements; Weathering