Effect of accelerated carbonation and zero valent iron on metal leaching from bottom ash

Waste Management
M NilssonA Lagerkvist

Abstract

About 85% of the ashes produced in Sweden originated from the incineration of municipal solid waste and biofuel. The rest comes from the thermal treatment of recycled wood, peat, charcoal and others. About 68% of all ashes annually produced in Sweden are used for constructions on landfills, mainly slopes, roads and embankments, and only 3% for construction of roads and working surfaces outside the landfills (SCB, 2013). Since waste bottom ash (BA) often has similar properties to crushed bedrock or gravel, it could be used for road constructions to a larger extent. However, the leaching of e.g. Cr, Cu, Mo, Pb and Zn can cause a threat to the surrounding environment if the material is used as it is. Carbonation is a commonly used pre-treatment method, yet it is not always sufficient. As leaching from aged ash is often controlled by adsorption to iron oxides, increasing the number of Fe oxide sorption sites can be a way to control the leaching of several critical elements. The importance of iron oxides as sorption sites for metals is known from both mineralogical studies of bottom ash and from the remediation of contaminated soil, where iron is used as an amendment. In this study, zero valent iron (Fe(0)) was added prior to accele...Continue Reading

References

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Citations

May 11, 2017·Environmental Science and Pollution Research International·Yunmei WeiTakayuki Shimaoka
May 14, 2018·Environmental Science and Pollution Research International·Hiroki KitamuraFumitake Takahashi
May 12, 2018·Environmental Science and Pollution Research International·Lidia LombardiRiccardo Spagnuolo
Apr 22, 2020·Journal of Environmental Management·Justyna Bohacz, Teresa Korniłłowicz-Kowalska

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