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  • 1.
    Aghajani, M
    et al.
    Department of Chemical Engineering, Babol Noushirvani University of Technology.
    Rahimpour, A
    Department of Chemical Engineering, Babol Noushirvani University of Technology.
    Amani, H
    Department of Chemical Engineering, Babol Noushirvani University of Technology.
    Taherzadeh, Mohammad J
    University of Borås, Faculty of Textiles, Engineering and Business.
    Rhamnolipid as new bio-agent for cleaning of ultrafiltration membrane fouled by whey2018In: Engineering in Life Sciences, ISSN 1618-0240, E-ISSN 1618-2863, Vol. 18, no 5, p. 272-280Article in journal (Refereed)
    Abstract [en]

    In this work, rhamnolipid biosurfactant as an eco-friendly and biodegradable cleaning agent was produced by Pseudomonas aeruginosa bacteria and was used to evaluate the chemical cleaning efficiency of whey fouled ultrafiltration membranes. Thin layer chromatography (TLC) and Fourier transform infrared spectroscopy (FTIR) confirmed the successful synthesis of rhamnolipid. The produced rhamnolipid was compared to chemical cleaners including sodium hydroxide (NaOH), sodium dodecyl sulfate (SDS) and Tween 20. Ultrafiltration membranes used for fouling and cleaning analysis were prepared using phase inversion via immersion precipitation technique. For studying the fouling mechanisms, Hermia's model adapted to cross-flow was used. From the fouling mechanism experiments, it was found that the complete blocking and cake formation were the dominant fouling mechanisms. The highest values of cleaning efficiency were achieved using rhamnolipid and NaOH as cleaning agents with the flux recovery of 100%, but with considering the low concentration of the rhamnolipid used in the cleaning solution compared to NaOH (0.3 versus 4 g/L for NaOH), its application is preferred. 

  • 2.
    Ferreira, Jorge A
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Lennartsson, Patrik R
    University of Borås, Faculty of Textiles, Engineering and Business.
    Taherzadeh, Mohammad J
    University of Borås, Faculty of Textiles, Engineering and Business.
    Production of ethanol and biomass from thin stillage by Neurospora intermedia: A pilot study for process diversification2015In: Engineering in Life Sciences, ISSN 1618-0240, E-ISSN 1618-2863, Vol. 15, no 8, p. 751-759Article in journal (Refereed)
    Abstract [en]

    Dry mill ethanol processes produce ethanol and animal feed from whole grains,where the wastewater after the distillation and separation of solid materials is called“thin stillage.” In this work, similar production of ethanol (3.5 g/L) and biomass(5 g/L) from thin stillage was obtained during batch cultivation of the edible fungusNeurospora intermedia in a 2-m high airlift reactor and bubble column. The fungalbiomass, containing 50% w/w protein and 12% w/w lipids, was rich in essentialamino acids and omega-3 and -6 fatty acids. In a continuousmode of fermentation,dilution rates of up to 0.2 h−1 could be applied without cell washout in the bubblecolumn at 0.5 vvm. At 0.1 h−1, around 5 g/L of ethanol and 4 g/L of biomasscontaining ca. 50% w/w protein were produced. The fungus was able to assimilatesaccharides in the liquid fraction as well as sugar backbones such as xylan andarabinan in the solid fraction. The inclusion of the current process could potentiallylead to the production of 11 000 m3 of ethanol (5.5% improvement vs. normalindustrial process) and around 6300 tons of high-quality biomass for animal feed ata typical facility producing 200 000 m3 ethanol per year.

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