title: Development of drainage water quality from a landfill cover built with secondary construction materials.
abstract: The aim of this study was to evaluate the drainage water quality from a landfill cover built with secondary construction materials (SCM), fly ash (FA), bottom ash (BA) sewage sludge, compost and its changes over time. Column tests, physical simulation models and a full scale field test were conducted. While the laboratory tests showed a clear trend for all studied constituents towards reduced concentrations over time, the concentrations in the field fluctuated considerably. The primary contaminants in the drainage water were Cl(-), N, dissolved organic matter and Cd, Cu, Ni, Zn with initial concentrations one to three orders of magnitude above the discharge values to the local recipient. Using a sludge/FA mixture in the protection layer resulted in less contaminated drainage water compared to a sludge/BA mixture. If the leaching conditions in the landfill cover change from reduced to oxidized, the release of trace elements from ashes is expected to last about one decade longer while the release of N and organic matter from the sludge can be shortened with about two-three decades. The observed concentration levels and their expected development over time require drainage water treatment for at least three to four decades before the water can be discharged directly to the recipient.
authors.affiliation: Division of Waste Science and Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden; Ragn Sells AB, Box 952, 19129 Sollentuna, Sweden. Electronic address: travar76@yahoo.com.
authors.forename: Igor
authors.initials: I
authors.lastname: Travar
authors.affiliation: Division of Waste Science and Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden.
authors.forename: Lale
authors.initials: L
authors.lastname: Andreas
authors.affiliation: Division of Waste Science and Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden.
authors.forename: Jurate
authors.initials: J
authors.lastname: Kumpiene
authors.affiliation: Division of Waste Science and Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden.
authors.forename: Anders
authors.initials: A
authors.lastname: Lagerkvist
mesh_terms: D002712:Chlorides / Q000032:analysis; D060729:Coal Ash; D003252:Construction Materials; D008670:Metals / Q000032:analysis; D008962:Models, Theoretical; D009584:Nitrogen / Q000032:analysis; D012722:Sewage; D012987:Soil; D013548:Sweden; D064091:Waste Disposal Facilities; D014866:Waste Products; D014874:Water Pollutants, Chemical / Q000032:analysis*; D060753:Water Quality
chemical_list: D002712:Chlorides; D060729:Coal Ash; D008670:Metals; D012722:Sewage; D012987:Soil; D014866:Waste Products; D014874:Water Pollutants, Chemical; D009584:Nitrogen
keywords: Ash; Drainage water; Landfill cover; Leaching; Sewage sludge