Ethanol production from maize silage as lignocellulosic biomass in anaerobically digested and wet-oxidized manure

• Published in: Bioresource technology 2008-09, Vol.99 (13), p.5327-5334
• Main Authors: Oleskowicz-Popiel, Piotr, Lisiecki, Przemyslaw, Holm-Nielsen, Jens Bo, Thomsen, Anne Belinda, Thomsen, Mette Hedegaard
• Format: Article
• Language: English
• Subjects: Anaerobically digested manure; Anaerobiosis; Animal Feed; Animals; Applied sciences; Bioethanol; Biofuel production; Biological and medical sciences; Biological treatment of sewage sludges and wastes; Biomass; Bioreactors; Biotechnology; Energy; Environment and pollution; Ethanol - metabolism; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Industrial applications and implications. Economical aspects; Lignin; Maize silage; Manure; Oxidation-Reduction; Pollution; Silage; SSF; Triticum aestivum; Wastes; Wet-oxidation; Zea mays; Zea mays - metabolism
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2007.11.029

In this communication, pretreatment of the anaerobically digested (AD) manure and the application of the pretreated AD manure as liquid medium for the simultaneous saccharification and fermentation (SSF) were described. Furthermore, fermentation of pretreated maize silage and wheat straw was investigated using 2 l bioreactors. Wet oxidation performed for 20 min at 121 °C was found as the most suitable pretreatment conditions for AD manure. High ammonia concentration and significant amount of macro- and micro-nutrients in the AD manure had a positive influence on the ethanol fermentation. No extra nitrogen source was needed in the fermentation broth. It was shown that the AD manure could successfully substitute process water in SSF of pretreated lignocellulosic fibres. Theoretical ethanol yields of 82% were achieved, giving 30.8 kg ethanol per 100 kg dry mass of maize silage.