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  • 1. Bátori, Veronika
    et al.
    Ferreira, Jorge A
    University of Borås, Faculty of Textiles, Engineering and Business.
    Taherzadeh, Mohammad J
    University of Borås, Faculty of Textiles, Engineering and Business.
    Lennartsson, Patrik R
    University of Borås, Faculty of Textiles, Engineering and Business.
    Ethanol and Protein from Ethanol Plant By-Products Using Edible Fungi Neurospora intermedia and Aspergillus oryzae2015In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141, Vol. 2015, no nov23Article in journal (Refereed)
    Abstract [en]

    Feasible biorefineries for production of second-generation ethanol are difficult to establish due to the process complexity. An alternative is to partially include the process in the first-generation plants. Whole stillage, a by-product from dry-mill ethanol processes from grains, is mostly composed of undegraded bran and lignocelluloses can be used as a potential substrate for production of ethanol and feed proteins. Ethanol production and the proteins from the stillage were investigated using the edible fungi Neurospora intermedia and Aspergillus oryzae, respectively. N. intermedia produced 4.7 g/L ethanol from the stillage and increased to 8.7 g/L by adding 1 FPU of cellulase/g suspended solids. Saccharomyces cerevisiae produced 0.4 and 5.1 g/L ethanol, respectively. Under a two-stage cultivation with both fungi, up to 7.6 g/L of ethanol and 5.8 g/L of biomass containing 42% (w/w) crude protein were obtained. Both fungi degraded complex substrates including arabinan, glucan, mannan, and xylan where reductions of 91, 73, 38, and 89% (w/v) were achieved, respectively. The inclusion of the current process can lead to the production of 44,000 m(3) of ethanol (22% improvement), around 12,000 tons of protein-rich biomass for animal feed, and energy savings considering a typical facility producing 200,000 m(3) ethanol/year.

  • 2.
    Dasa, Kris Triwulan
    et al.
    Universitas Gadjah Mada.
    Westman, Supansa Y.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Millati, Ria
    Universitas Gadjah Mada.
    Cahyanto, Muhammad Nur
    Universitas Gadjah Mada.
    Taherzadeh, Mohammad J
    University of Borås, Faculty of Textiles, Engineering and Business.
    Niklasson, Claes
    Chalmers.
    Inhibitory Effect of Long-Chain Fatty Acids on Biogas Production and the Protective Effect of Membrane Bioreactor2016In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141Article in journal (Refereed)
    Abstract [en]

    Anaerobic digestion of lipid-containing wastes for biogas production is often hampered by the inhibitory effect of long-chain fatty acids (LCFAs). In this study, the inhibitory effects of LCFAs (palmitic, stearic, and oleic acid) on biogas production as well as the protective effect of a membrane bioreactor (MBR) against LCFAs were examined in thermophilic batch digesters. The results showed that palmitic and oleic acid with concentrations of 3.0 and 4.5 g/L resulted in >50% inhibition on the biogas production, while stearic acid had an even stronger inhibitory effect. The encased cells in the MBR system were able to perform better in the presence of LCFAs. This system exhibited a significantly lower percentage of inhibition than the free cell system, not reaching over 50% at any LCFA concentration tested.[on SciFinder (R)]

  • 3. Mirmohamadsadeghi, Safoora
    et al.
    Karimi, Keikhosro
    Zamani, Akram
    Amiri, Hamid
    Sárvári Horváth, Ilona
    University of Borås, Faculty of Textiles, Engineering and Business.
    Enhanced solid-state biogas production from lignocellulosic biomass by organosolv pretreatment2014In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141, Vol. 2014Article in journal (Refereed)
  • 4.
    Seoane, Fernando
    et al.
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    Abtahi, Shirin
    Karolinkska University Hospital.
    Abtahi, Farhad
    KTH-School of Technology and Health.
    Ellegård, Lars
    University of Gothenburg.
    Johannsson, Gudmundur
    University of Gothenburg.
    Bosaeus, Ingvar
    University of Gothenburg.
    Ward, Leigh C
    University of Queensland.
    Mean Expected Error in Prediction of Total Body Water.: A True Accuracy Comparison between Bioimpedance Spectroscopy and Single Frequency Regression Equations.2015In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141, Vol. 2015Article in journal (Refereed)
  • 5. Shafiei, M.
    et al.
    Karimi, K.
    University of Borås, School of Engineering.
    Zilouei, H.
    Taherzadeh, M.J.
    University of Borås, School of Engineering.
    Economic impact of NMMO pretreatment on ethanol and biogas production from pinewood2014In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141, Vol. 2014Article in journal (Refereed)
    Abstract [en]

    Processes for production of ethanol and biogas (scenario 1) and biomethane (scenario 2) from pinewood improved by N - methyl morpholine - N - oxide ( NMMO) pretreatnment were developed and simulated by Aspen plus®.These processes were compared with t wo processes using steam explosion instead of N - methyl morpholine - N - oxide ( NMMO) pretreatment for production of ethanol (scenario 3) and biomethane (scenario 4), and the econom ies of these four processes were evaluated by Aspen Process Economic Analyzer ( PEA ). The gasoline equivalent prices of the products including 25% value added tax ( VAT ) and selling and distribution expenses for the scenarios 1 to 4 were respectively 1.40, 1 .20, 1.24, and 1.04 €/l, which are lower than gasoline price (1.65 €/l average in 2013 in Sweden). The profitability indexes for the scenarios 1 to 4 were 1.14, 0.93, 1.16, and 0.96 , respectively. Despite the lower manufacturing costs of biomethane, the pr ofitability indexes of these processes were lower than that of the bioethanol processes, because of higher capital requirements. The results showed that taxing rule is an effective parameter on the economy of the biofuels. The gasoline equivalent prices of the biofuels were 18 - 39% lower than gasoline; however, 37% of the gasoline price contributes to ene rgy and carbon dioxide tax which are not included in the prices of biofuels based on the Swedish taxation rules .

  • 6. Shafiei, Marzieh
    et al.
    Karimi, Keikhosro
    University of Borås, School of Engineering.
    Zilouei, Hamid
    Taherzadeh, Mohammad J.
    University of Borås, School of Engineering.
    Enhanced Ethanol and Biogas Production from Pinewood by NMMO Pretreatment and Detailed Biomass Analysis2014In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141, Vol. 2014, no Article ID 469378Article in journal (Refereed)
    Abstract [en]

    N-Methyl morpholine-N-oxide (NMMO) is an environmentally friendly and commercially applied cellulose solvent that is suggested for pretreatment of lignocelluloses to improve biofuel productions. However, the underlying mechanisms of the improvements have been poorly understood yet. In an attempt to investigate the mechanisms, pinewood powder and chips were pretreated with 85% (w/w) NMMO at 120°C for 1–15 h. The pretreatment improved ethanol production yield from 7.2% (g/g) for the untreated wood powder to 68.1–86.1% (g/g) and from 1.7% (g/g) for the untreated wood chips to 12.6–51.2% (g/g) of theoretical yield. Similarly, the biogas yields of untreated wood chips and powder were improved from 21 and 66 (mL/g volatile solids) by 3.5–6.8- and 2.6–3.4-folds, respectively. SEM micrographs indicated major increase in the wood porosity by the pretreatment, which would confirm increase in the water swelling capacity as well as enzyme adsorption. The analysis of X-ray diffraction showed considerable reduction in the cellulose crystallinity by the pretreatment, while FTIR spectroscopy results indicated reduction of lignin on the wood surface by the pretreatment.

  • 7.
    Tabatabaei, Meisam
    et al.
    Microbial Biotechnology Department, Agricultural Biotechnology Research Institute of Iran (ABRII.
    Karimi, Keikhosro
    Department of Chemical Engineering, Isfahan University of Technology.
    Kumar, Rajeev
    6 Center for Environmental Research and Technology (CE-CERT), Bourns College of Engineering, University of California.
    Sárvári Horváth, Ilona
    University of Borås, Faculty of Textiles, Engineering and Business.
    Renewable Energy and Alternative Fuel Technologies2015In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141Article in journal (Other academic)
  • 8.
    Wikandari, Rachma
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nguyen, Huong
    Millati, Ria
    Niklasson, Claes
    Taherzadeh, Mohammad J
    University of Borås, Faculty of Textiles, Engineering and Business.
    Improvement of Biogas Production from Orange Peel Waste by Leaching of Limonene2015In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141Article in journal (Refereed)
    Abstract [en]

    Limonene is present in orange peel wastes and is known as an antimicrobial agent, which impedes biogas production when digesting the peels. In this work, pretreatment of the peels to remove limonene under mild condition was proposed by leaching of limonene using hexane as solvent. The pretreatments were carried out with homogenized or chopped orange peel at 20–40°C with orange peel waste and hexane ratio (w/v) ranging from 1 : 2 to 1 : 12 for 10 to 300 min. The pretreated peels were then digested in batch reactors for 33 days. The highest biogas production was achieved by treating chopped orange peel waste and hexane ratio of 12 : 1 at 20°C for 10 min corresponding to more than threefold increase of biogas production from 0.061 to 0.217 m3methane/kg VS. The solvent recovery was 90% using vacuum filtration and needs further separation using evaporation. The hexane residue in the peel had a negative impact on biogas production as shown by 28.6% reduction of methane and lower methane production of pretreated orange peel waste in semicontinuous digestion system compared to that of untreated peel.

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