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Utilization of air pollution control residues for the stabilization/solidification of trace element contaminated soil
- 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.
- Subjects :
- chemistry.chemical_classification
Soil test
Chemistry
Health, Toxicology and Mutagenesis
Soil organic matter
Environmental engineering
Soil classification
Incineration
General Medicine
Calcium Compounds
Coal Ash
Pollution
Soil contamination
Soil conditioner
Soil
Metals, Heavy
Environmental chemistry
Arsenates
Soil Pollutants
Environmental Chemistry
Organic matter
Leaching (agriculture)
Environmental Pollution
Waste disposal
Subjects
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