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  • 1.
    Davidsson, Åsa
    et al.
    Lund University.
    Kjerstadius, Hamse
    Lund University.
    Haghighatafshar, Salar
    Lund University.
    Fick, Jerker
    Umeå University.
    Olsson, Mikael Emil
    Technical University of Denmark, Denmark.
    Wachtmeister, Hilla
    Technical University of Denmark, Denmark.
    Eriksson, Eva
    Linnaeus University, School of Business and Economics. Technical University of Denmark, Denmark.
    Ia Cour Jansen, J.
    Lund University.
    Effect of anaerobic digestion at 35, 55 and 60 °C on pharmaceuticals and organic contaminants2014In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 69, no 6, p. 1282-1288Article in journal (Refereed)
    Abstract [en]

    The application of treated sewage sludge on farmland is a suggested method for recycling nutrients and reducing demand for commercial fertilizer. However, sludge needs to be safe from possible contaminants which can cause acute and long-term health and environmental problems. Residual pharmaceuticals and organic contaminants are mentioned as emerging threats since wastewater treatment plants are not designed to degrade these substances. The aim of this study was to screen and evaluate the presence, and reduction, of pharmaceuticals and polycyclic aromatic hydrocarbons (PAHs) during anaerobic digestion of mixed primary and waste-activated sludge at 35, 55 and 60°C and during pasteurization at 70°C. The study showed the difficulty of analysing pharmaceutical compounds in low concentrations in the sludge matrix. No general reduction of these compounds was seen during treatment, but for individual substances some reduction occured. The PAHs were generally not reduced during digestion or pasteurization, but for three substances (indeno[1,2,3-cd]pyrene and dibenzo[a,h]anthracene (analysed together) and benzo[g,h,i]perylene) reduction (up to 60%) during digestion was seen. Digestion at 35 and 55°C resulted in about the same order of reduction of the three individual PAHs, which was higher than for digestion at 60°C.

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