Management of iron stabilised CCA contaminated soil
2006 (English)In: Proceedings of the Sixth International Conference on the Environmental and Technical Implications of Construction with Alternative Materials: WASCON 2006 / [ed] Marina Ilic, Belgrade: ISCOWA , 2006, 665-676 p.Conference paper (Refereed)
Chemical stabilisation of trace element contaminated soil may be used as pre-treatment prior to landfilling or re-utilisation. Three different treatments with iron amendments were evaluated for their efficiency in reducing trace element mobility in chromate copper arsenate (CCA) contaminated soil. The amendments tested were two industrial by-products from steel production industries, viz. blaster sand, containing mainly zerovalent iron (Fe0), and oxygen scarfing granulate, with mainly iron oxides. Batch, column, and lysimeter leaching tests were conducted on untreated and treated soils. The tests were used to firstly evaluate the potential of the amendments as stabilising agents, and secondly to assess the potential management of the treated soil. Soil amendments lowered concentrations of As, Cu, Cr, and Zn in soil pore water and leachate, whereas Fe, Mn, and Ni showed tendencies towards increased concentrations. The treatment efficiency can be ranked as 1% Fe0 < 4% iron oxides < 8% iron oxides. While iron oxides may be used as effective amendments to reduce As leaching from soil, their effects on leaching of e.g. Ni warrant careful consideration. Further, impurities of the iron oxides increased soil concentrations of e.g. Cr, potentially limiting re-utilisation of the treated soil. Lowered As leaching from column and lysimeter tests on treated soil indicated aerobic soil conditions and, hence, stability of iron oxides. This may, however, be an artefact of a too short testing period for anaerobic conditions to establish.
Place, publisher, year, edition, pages
Belgrade: ISCOWA , 2006. 665-676 p.
Research subject Waste Science and Technology
IdentifiersURN: urn:nbn:se:ltu:diva-38649Local ID: d18360c0-c1ae-11db-9ea3-000ea68e967bISBN: 8690881506OAI: oai:DiVA.org:ltu-38649DiVA: diva2:1012150
International Conference on the Environmental and Technical Implications of Construction with Alternative Materials, Science and Engineering of Recycling for Environmental Protection : 30/05/2006 - 02/06/2006
Godkänd; 2006; Bibliografisk uppgift: CD-ROM; 20070103 (ysko)2016-10-032016-10-03Bibliographically approved