VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Anaerobic digestion of mechanically and chemically pretreated lignocellulosic substrate [Elektronski vir]
    Sežun, Mija ; Grilc, Viktor ; Marinšek-Logar, Romana, 1960-
    High methane production potential of lignocellulosic substrates (like brewery wastes) in an anaerobic degradation process deserves special research concern. Relatively high content of lignin, ... however, much affects degradation through its fitotoxic degradation products and thus limits the rate of degradation of major component - structural polysaccharides. In this paper differences in biogas production from mechanically and chemically pretreated brewery spent grain (BSG) will be presented and critically discussed. As a substrate a combination of brewery wastewater and brewery spent grain was used. Pilot-scale semi-continuous bioreactors operated in mesophilic conditions in the experiments. The performance of the reactors was monitored by measuring the following parameters: biogas production and pH (recorded daily), volatile fatty acids, chemical oxygen demand, ammonia-N (recorded weekly). In addition to these parameters lignin degradation products like phenol and alkylphenols were analysed. Inhibition of biogas production due to the cummulative diverse effects of degradation products in the fully loaded methanogenic reactor was also studied.The inhibition occurred, due to the inhibitory effects of lignin and its degradation products on certain functional groups of anaerobic bacteria and archaea. The differences between mechanically and chemically pretreated BSG were demonstrated during anaerobic degradation. The results suggested that the anaerobic digestion of mechanically pretreated BSG is more effective than anaerobic digestion of chemically pretreated BSG. Decrease in biogas production of mechanically pretreated BSG was detected later (after 126 days) than in anaerobic digestionof chemically-alkali and acid pretreated BSG (77 days). Average biogas production in mechanically pretreated BSG was 19,97 ml/min, in alkali pretreated BSG 19,02 ml/min and in acid pretreated BSG 18,70 ml/min.
    Vir: Venice 2010 symposium [Elektronski vir] (Str. [1-9])
    Vrsta gradiva - prispevek na konferenci
    Leto - 2010
    Jezik - angleški
    COBISS.SI-ID - 4552218

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