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  • 1.
    Grandin, Anna
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Ogar, Anna
    Nilsson, Charlotte
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Sjöberg, Viktor
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Retention of uranium (VI) by live fungal biomass from a uranyl nitrate solution: Implications and applications under nutrient-poor conditionsManuskript (preprint) (Annet vitenskapelig)
  • 2.
    Karlsson, Stefan
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Nilsson, Charlotte
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Berg, Isabelle
    Sjöberg, Viktor
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Avloppsslam som vattenreningsfilter2015Konferansepaper (Annet vitenskapelig)
  • 3.
    Nilsson, Charlotte
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Grandin, Anna
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Sjöberg, Viktor
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Phosphorus speciation in sewage sludge and ashes from three municipal WWTPs in Sweden: investigating the possibilities for phosphorus recoveryManuskript (preprint) (Annet vitenskapelig)
  • 4.
    Nilsson, Charlotte
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik. Ekokem AB, Kumla, Sweden.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Sjöberg, Viktor
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    von Kronhelm, Thomas
    Ekokem AB, Kumla, Sweden.
    Municipal sludge ash for abatement of ARD2016Inngår i: Mining Meets Water – Conflicts and Solutions: IMWA 2016 in Leipzig, Germany, July 11–15, 2016 / [ed] Drebenstedt, C. & Paul, M., Freiberg: TU Bergakademie Freiberg, Institute of Mining and Special Civil Engineering , 2016, s. 699-705Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Abatement of ARD with passive treatment systems can quite often rely only on pH-control if the iron content is high enough and to allow for the formation of ferric hydrous oxides, which act as efficient adsorbents. The stability of ferric hydrous oxides is sensitive to lowering of pH as well as Eh why they must be controlled. Hence, it would be favourable to use a well ordered adsorbent that is stable over time and under the chemical conditions of ARD. Municipal waste water sludge is a growing problem in many countries and incineration under oxidative conditions can be used to oxidize anthropogenic organic molecules which pose a threat to the environment. Sludge ashes rendering from wastewater treatment in which iron is used as a flocculation agent have high concentrations of calcium/ magnesium and ferric oxides, and should therefore, in theory be a suitable candidate for treatment of ARD. This study has therefore focused on the ability for these ashes to act as a sorbent for the removal of metals from ARD. The stability and potential release of metals from the material were quantified in batch experiments by extraction at pH 2-10, resulting in equilibrium concentrations (at pH 8) of 11.9, 0.08 and 24.1 mg L-1 for Al, Fe and Mn respectively. However, after washing with water the corresponding values were 0.01, 0.03 and 0.09 mgL(-1). In fact, after washing the sludge ash is stable from pH 4 to 10, with only slightly higher concentrations found at pH 2. Batch experiments on metal adsorption from ARD showed more than 99% sorption of Cr, Cu, Pb and V, corresponding values for Co, Ni and Zn were 56, 86 and 34% respectively. The overall results from this study show that sludge ashes are a promising solution for treatment of ARD.

  • 5.
    Nilsson, Charlotte
    et al.
    Department of Land and Water Resources Engineering, Royal Institute of Technology, Stockholm, Sweden.
    Lakshmanan, Ramnath
    School of Biotechnology, KTH Royal Institute of Technology, Stockholm, Sweden.
    Renman, Gunno
    Department of Land and Water Resources Engineering, Royal Institute of Technology, Stockholm, Sweden.
    Rajarao, Gunaratna Kuttuva
    School of Biotechnology, KTH Royal Institute of Technology, Stockholm, Sweden.
    Efficacy of reactive mineral-based sorbents for phosphate, bacteria, nitrogen and TOC removal: Column experiment in recirculation batch mode2013Inngår i: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 47, nr 14, s. 5165-5175Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Two mineral-based materials (Polonite and Sorbulite) intended for filter wells in on-site wastewater treatment were compared in terms of removal of phosphate (PO4-P), total inorganic nitrogen (TIN), total organic carbon (TOC) and faecal indicator bacteria (Escherichia coli and Enterococci). Using an innovative, recirculating system, septic tank effluent was pumped at a hydraulic loading rate of 3000 L m(2) d(-1) into triplicate bench-scale columns of each material over a 90-day period. The results showed that Polonite performed better with respect to removal of PO4-P, retaining on average 80% compared with 75% in Sorbulite. This difference was attributed to higher CaO content in Polonite and its faster dissolution. Polonite also performed better in terms of removal of bacteria because of its higher pH value. The total average reduction in E. coli was 60% in Polonite and 45% in Sorbulite, while for Enterococci the corresponding value was 56% in Polonite and 34% in Sorbulite. Sorbulite removed TIN more effectively, with a removal rate of 23%, while Polonite removed 11% of TIN, as well as TOC. Organic matter (measured as TOC) was accumulated in the filter materials but was also released periodically. The results showed that Sorbulite could meet the demand in removing phosphate and nitrogen with reduced microbial release from the wastewater treatment process. (C) 2013 Elsevier Ltd. All rights reserved.

  • 6.
    Nilsson, Charlotte
    et al.
    Department of Land and Water Resources Engineering, Royal Institute of Technology, Stockholm, Sweden .
    Renman, Gunno
    Department of Land and Water Resources Engineering, Royal Institute of Technology, Stockholm, Sweden .
    Westholm, Lena Johansson
    School of Business, Society and Engineering, Mälardalen University, Västerås, Sweden.
    Renman, Agnieszka
    Department of Land and Water Resources Engineering, Royal Institute of Technology, Stockholm, Sweden .
    Drizo, Aleksandra
    PhosphoReduc LLC, Burlington VT, USA.
    Effect of organic load on phosphorus and bacteria removal from wastewater using alkaline filter materials2013Inngår i: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 47, nr 16, s. 6289-6297Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The organic matter released from septic tanks can disturb the subsequent step in on-site wastewater treatment such as the innovative filters for phosphorus removal. This study investigated the effect of organic load on phosphorus (P) and bacteria removal by reactive filter materials under real-life treatment conditions. Two long-term column experiments were conducted at very short hydraulic residence times (average similar to 5.5 h), using wastewater with high (mean similar to 120 mg L-1) and low (mean similar to 20 mg L-1) BOD7 values. Two alkaline filter materials, the calcium-silicate material Polonite and blast furnace slag (BFS), were tested for the removal capacity of total P, total organic carbon (TOC) and Enterococci. Both experiments showed that Polonite removed P significantly ( p < 0.01) better than BFS. An increase in P removal efficiency of 29.3% was observed for the Polonite filter at the lower concentration of BOD7 ( p < 0.05). Polonite was also better than BFS with regard to removal of TOC, but there were no significant differences between the two filter materials with regard to removal of Enterococci. The reduction in Enterococci was greater in the experiment using wastewater with high BOD7, an effect attributable to the higher concentration of bacteria in that wastewater. Overall, the results demonstrate the importance of extensive pre-treatment of wastewater to achieve good phosphorus removal in reactive bed filters and prolonged filter life.

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