title: Acid mine drainage treatment using by-products from quicklime manufacturing as neutralization chemicals.
abstract: The aim of this research was to investigate whether by-products from quicklime manufacturing could be used instead of commercial quicklime (CaO) or hydrated lime (Ca(OH)2), which are traditionally used as neutralization chemicals in acid mine drainage treatment. Four by-products were studied and the results were compared with quicklime and hydrated lime. The studied by-products were partly burnt lime stored outdoors, partly burnt lime stored in a silo, kiln dust and a mixture of partly burnt lime stored outdoors and dolomite. Present application options for these by-products are limited and they are largely considered waste. Chemical precipitation experiments were performed with the jar test. All the studied by-products removed over 99% of Al, As, Cd, Co, Cu, Fe, Mn, Ni, Zn and approximately 60% of sulphate from acid mine drainage. However, the neutralization capacity of the by-products and thus the amount of by-product needed as well as the amount of sludge produced varied. The results indicated that two out of the four studied by-products could be used as an alternative to quicklime or hydrated lime for acid mine drainage treatment.
authors.affiliation: University of Oulu, Department of Chemistry, FIN-90014 University of Oulu, P.O. Box 3000, Finland.
authors.forename: Emma-Tuulia
authors.initials: ET
authors.lastname: Tolonen
authors.affiliation: Oulu Water Alliance Ltd., Kaitoväylä 1 F2, FIN-90570 Oulu, Finland.
authors.forename: Arja
authors.initials: A
authors.lastname: Sarpola
authors.affiliation: University of Oulu, Department of Chemistry, FIN-90014 University of Oulu, P.O. Box 3000, Finland.
authors.forename: Tao
authors.initials: T
authors.lastname: Hu
authors.affiliation: University of Oulu, Thule Institute, FIN-90014 University of Oulu, P.O. Box 7300, Finland.
authors.forename: Jaakko
authors.initials: J
authors.lastname: Rämö
authors.affiliation: University of Oulu, Department of Chemistry, FIN-90014 University of Oulu, P.O. Box 3000, Finland; Kokkola University Consortium Chydenius, Talonpojankatu 2B, FIN-67100 Kokkola, Finland. Electronic address: ulla.lassi@oulu.fi.
authors.forename: Ulla
authors.initials: U
authors.lastname: Lassi
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D011232:Chemical Precipitation; D008855:Microscopy, Electron, Scanning; D008906:Mining; D010087:Oxides / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D014874:Water Pollutants, Chemical; C016538:lime
keywords: Acid mine drainage (AMD); By-products; Neutralization; Quicklime; Wastewater treatment