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Utilization of air pollution control residues for the stabilization/solidification of trace element contaminated soil

Authors :
Anders Kihl
Jurate Kumpiene
Igor Travar
Source :
Environmental Science and Pollution Research. 22:19101-19111
Publication Year :
2015
Publisher :
Springer Science and Business Media LLC, 2015.

Abstract

The aim of this study was to evaluate the stabilization/solidification (S/S) of trace element-contaminated soil using air pollution control residues (APCRs) prior to disposal in landfill sites. Two soil samples (with low and moderate concentrations of organic matter) were stabilized using three APCRs that originated from the incineration of municipal solid waste, bio-fuels and a mixture of coal and crushed olive kernels. Two APCR/soil mixtures were tested: 30 % APCR/70 % soil and 50 % APCR/50 % soil. A batch leaching test was used to study immobilization of As and co-occurring metals Cr, Cu, Pb and Zn. Solidification was evaluated by measuring the unconfined compression strength (UCS). Leaching of As was reduced by 39–93 % in APCR/soil mixtures and decreased with increased amounts of added APCR. Immobilization of As positively correlated with the amount of Ca in the APCR and negatively with the amount of soil organic matter. According to geochemical modelling, the precipitation of calcium arsenate (Ca3(AsO4)2/4H2O) and incorporation of As in ettringite (Ca6Al2(SO4)3(OH)12 · 26H2O) in soil/APCR mixtures might explain the reduced leaching of As. A negative effect of the treatment was an increased leaching of Cu, Cr and dissolved organic carbon. Solidification of APCR/soil was considerably weakened by soil organic matter.

Details

ISSN :
16147499 and 09441344
Volume :
22
Database :
OpenAIRE
Journal :
Environmental Science and Pollution Research
Accession number :
edsair.doi.dedup.....034ed21429750deb1f049c77997726f7
Full Text :
https://doi.org/10.1007/s11356-015-5087-1