Leaching characteristics of the fine fraction from an excavated landfill: physico-chemical characterization
2017 (English)In: Journal of Material Cycles and Waste Management, ISSN 1438-4957, E-ISSN 1611-8227, Vol. 19, no 1, 294-304 p.Article in journal (Refereed) Published
Leaching of fine fraction (< 10 mm) obtained from landfill mining activities in an Estonian landfill was done. On-site excavation was carried out in four test pits (TP1, TP2, TP3, TP4) that were further divided in four layers (L (1), L (2), L (3), L (4)). Total chemical oxygen demand (CODt), dissolved chemical oxygen demand (CODd), total organic carbon (TOC), dissolved organic carbon (DOC) and metals (Zn, Cu, Pb and Cd) were analyzed. The results showed that approximately 70 % of CODt were in particulate/colloidal state. The TOC released ranged between 2326 and 3530-mg/kg dry matter for test pits suggesting spatial differences in the studied landfill. DOC ranged between 365-874 and 317-940 mg/kg for different test pits and sampling layers, respectively. Low average leaching rates of metals were observed (0.2-1.5 %). Pb had a significantly higher average leaching rate (1.0 %) compared to Zn (0.70 %) and Cu (0.35 %). The potential use of CODt as a surrogate indicator of TOC, DOC and Zn on the basis of high correlation coefficients was observed. To conclude, the implementation of adequate strategies to manage fine-grained fractions obtained from excavated waste relies on physico-chemical characterization of both the fine fractions itself and the leachate generated during storage and use.
Place, publisher, year, edition, pages
2017. Vol. 19, no 1, 294-304 p.
Landfill mining, Leachate, Heavy metals, TOC, DOC
Research subject Natural Science, Environmental Science
IdentifiersURN: urn:nbn:se:lnu:diva-60806DOI: 10.1007/s10163-015-0418-3ISI: 000392385300030OAI: oai:DiVA.org:lnu-60806DiVA: diva2:1075951