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Leachability and metal-binding capacity in ageing landfill material
KTH, Skolan för kemivetenskap (CHE), Kemi, Oorganisk kemi.
2008 (engelsk)Inngår i: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 28, nr 1, s. 142-150Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In order to study the stability of landfilled heavy metals, landfill material from a combined household and industrial waste landfill was aerated for 14 months to simulate the natural ageing processes as air slowly begins to penetrate the landfill mass. During aeration, the pH of the landfill material decreased from around 8.6 to 8.1 and the carbon content also decreased. In order to investigate the possible fate of metals in ageing landfills, a four-stage sequential extraction technique was applied. The ability of the materials to bind metal ions by electrostatic attractions and to form stronger complexes was studied separately. The amount of exchangeable cations, the capacity to bind metal ions by electrostatic attraction and the capacity of the landfill material to complex copper ions were increased by the aeration process. However, results from the sequential analysis showed an increased solubility of sulphur and some metals (Cd, Co, Cu, Ni and Zn). Equilibrium speciation models (Medusa) indicated that the organic matter deposit had a significant capacity to bind metal ions provided that pH was sufficiently high. However, as carbonates are consumed over time, the risk for metal mobility increases. Therefore, the landfills can become an environmental risk, depending on variations in the solubility of metal ions due to changes in pH, redox status and the availability of organic material.

sted, utgiver, år, opplag, sider
2008. Vol. 28, nr 1, s. 142-150
Emneord [en]
LEACHATE; WASTE
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-36417DOI: 10.1016/j.wasman.2006.11.003ISI: 000251660900015Scopus ID: 2-s2.0-35548968046OAI: oai:DiVA.org:kth-36417DiVA, id: diva2:430768
Merknad
QC 20110712Tilgjengelig fra: 2011-07-12 Laget: 2011-07-12 Sist oppdatert: 2017-12-11bibliografisk kontrollert

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