title: Quaternized pine sawdust in the treatment of mining wastewater.
abstract: Mining wastewater was treated using quaternized pine sawdust (QPSD) anion exchanger. The wastewater contained heavy metals (e.g. Sb, As, Co, Cr, Ni, V, U), NO3(-), among others, and a high concentration of SO4(2-). A series of column cycles imitating a real treatment process was conducted (three sorption/desorption cycles, a maintenance cycle with HCl and two sorption/desorption cycles). The effects of contact time and temperature (5°C and 23°C) were studied to assess the applicability of QPSD in the treatment of cold mining effluents. At 5°C, 85% of nickel was removed but the sorption was slower than at 23°C (initial Ni concentration was about 39 µg/l). Nickel was also removed in column efficiently (85-100% reduction). Treatment with HCl during the maintenance cycles did not hinder nickel sorption. Nickel was desorbed with both NaCl and HCl. Contrary to expectations, nitrate was not sorbed. QPSD showed selectivity towards nickel. However, uptake of uranium and cobalt was detected in column. Neutron activation analysis was used to detect metals sorbed onto the QPSD, and uptake of several metals was confirmed.
authors.affiliation: a Chemical Process Engineering , University of Oulu , Oulu , Finland.
authors.forename: Anni
authors.initials: A
authors.lastname: Keränen
authors.affiliation: a Chemical Process Engineering , University of Oulu , Oulu , Finland.
authors.forename: Tiina
authors.initials: T
authors.lastname: Leiviskä
authors.affiliation: b Joint Institute for Nuclear Research , Dubna , Moscow Region , Russian Federation.
authors.forename: Inga
authors.initials: I
authors.lastname: Zinicovscaia
authors.affiliation: b Joint Institute for Nuclear Research , Dubna , Moscow Region , Russian Federation.
authors.forename: Marina V
authors.initials: MV
authors.lastname: Frontasyeva
authors.affiliation: c Department of Physics and Chemistry , University of Oulu , Oulu , Finland.
authors.forename: Osmo
authors.initials: O
authors.lastname: Hormi
authors.affiliation: a Chemical Process Engineering , University of Oulu , Oulu , Finland.
authors.forename: Juha
authors.initials: J
authors.lastname: Tanskanen
mesh_terms: D002852:Chromatography, Ion Exchange / Q000379:methods; D003035:Cobalt / Q000302:isolation & purification; D007220:Industrial Waste / Q000032:analysis; D019216:Metals, Heavy / Q000302:isolation & purification*; D008906:Mining; D009532:Nickel / Q000302:isolation & purification; D009566:Nitrates / Q000302:isolation & purification; D028223:Pinus / Q000737:chemistry*; D014501:Uranium / Q000302:isolation & purification; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D003035:Cobalt; D007220:Industrial Waste; D019216:Metals, Heavy; D009532:Nickel; D009566:Nitrates; D014501:Uranium; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Mining wastewater; ion exchange; lignocellulose; neutron activation analysis; regeneration