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Nemestó,thy, Ná,ndor,Bakonyi, Pé,ter,Ró,zsenberszki, Tamá,s,Kumar, Gopalakrishnan,Koó,k, Lá,szló,Kelemen, Gá,bor,Kim, Sang-Hyoun,Bé,lafi-Bak Elsevier 2018 International journal of hydrogen energy Vol.43 No.41
<P><B>Abstract</B></P> <P>Lignocellulosic biofuel, in particular hydrogen gas production is governed by successful feedstock pretreatment, hydrolysis and fermentation. In these days, remarkable attention is paid to the use of ionic liquids to make the fermentable regions of lignocellulose biomass more accessible to the biocatalysts. Although these compounds have great potential for this purpose, their presence during the consecutive fermentation stage may pose a threat on process stability due to certain toxic effects. This, however, has not been specifically elaborated for dark fermentative biohydrogen generation. Hence, in this work, two common imidazolium-type ionic liquids (1-butyl-3-methylimidazolium acetate, ([bmim][Ac]) and 1-butyl-3-methylimidazolium chloride, ([bmim][Cl])) were employed in mixed culture biohydrogen fermentation to investigate the possible impacts related to their presence and concentrations. The batch assays were evaluated comparatively via the modified Gompertz-model based on the important parameters characterizing the process, namely the biohydrogen production potential, maximum biohydrogen production rate and lag-phase time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The impact of imidazolium-type ionic liquids on biohydrogen formation was tested. </LI> <LI> The batch biohydrogen production process was evaluated kinetically. </LI> <LI> Both [bmim][Ac] and [bmim][Cl] affected the biohydrogen formation performance. </LI> <LI> The anion part of ionic liquids ([Ac]<SUP>-</SUP> vs. [Cl]<SUP>-</SUP>) demonstrated notable effect. </LI> </UL> </P>
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Nemestó,thy, Ná,ndor,Bakonyi, Pé,ter,Szentgyö,rgyi, Eszter,Kumar, Gopalakrishnan,Nguyen, Dinh Duc,Chang, Soon Woong,Kim, Sang-Hyoun,Bé,lafi-Bakó,, Katalin Elsevier 2018 JOURNAL OF CLEANER PRODUCTION Vol.185 No.-
<P><B>Abstract</B></P> <P>In this paper, the enrichment of methane by membrane technology was studied by employing (i) a model as well as (ii) a real biogas mixture produced on a laboratory-scale. Thereafter, the endurance of the process was tested at an existing biogas plant. The commercial gas separation module under investigation contained hollow fiber membranes with a polyimide selective layer. During the measurements, the effect of critical factors (including the permeate-to-feed pressure ratio and the splitting factor) was sought in terms of the (i) CH<SUB>4</SUB> content on the retentate-side and (ii) CH<SUB>4</SUB> recovery, which are important measures of biogas upgrading efficiency. The results indicated that a retentate with 93.8 vol% of CH<SUB>4</SUB> – almost biomethane (>95 vol% of CH<SUB>4</SUB>) quality – could be obtained using the model gas (consisting of 80 vol% of CH<SUB>4</SUB> and 20 vol% of CO<SUB>2</SUB>) along with 77.4% CH<SUB>4</SUB> recovery in the single-stage permeation system. However, in the case of the real biogas mixture, ascribed primarily to inappropriate N<SUB>2</SUB>/CH<SUB>4</SUB> separation, the peak methane concentration noted was only 80.7 vol% with a corresponding 76% CH<SUB>4</SUB> recovery. Besides, longer-term experiments revealed the adequate time-stability of membrane purification, suggesting such a process is feasible under industrial conditions for the improvement of biogas quality.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Membrane gas separation was applied for biogas enrichment. </LI> <LI> Polyimide membrane was investigated to deliver biomethane. </LI> <LI> Significant variables affecting membrane performance were evaluated. </LI> <LI> Process efficiency was dependent on gas composition (model vs. real biogas). </LI> <LI> The gas permeation was steady in longer-terms using real biogas mixture. </LI> </UL> </P>
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Bakonyi, Pé,ter,Kumar, Gopalakrishnan,Bé,lafi-Bakó,, Katalin,Kim, Sang-Hyoun,Koter, Stanislaw,Kujawski, Wojciech,Nemestó,thy, Ná,ndor,Peter, Jakub,Pientka, Zbynek Elsevier 2018 Bioresource technology Vol.270 No.-
<P><B>Abstract</B></P> <P>This review article focuses on an assessment of the innovative Gas Separation Membrane Bioreactor (GS-MBR), which is an emerging technology because of its potential for in-situ biohydrogen production and separation. The GS-MBR, as a special membrane bioreactor, enriches CO<SUB>2</SUB> directly from the headspace of the anaerobic H<SUB>2</SUB> fermentation process. CO<SUB>2</SUB> can be fed as a substrate to auxiliary photo-bioreactors to grow microalgae as a promising raw material for biocatalyzed, dark fermentative H<SUB>2</SUB>-evolution. Overall, these features make the GS-MBR worthy of study. To the best of the authors’ knowledge, the GS-MBR has not been studied in detail to date; hence, a comprehensive review of this topic will be useful to the scientific community.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel integrative system has been proposed for biohydrogen technology. </LI> <LI> Innovative Gas Separation Membrane Bioreactors are evaluated. </LI> <LI> Simultaneous biohydrogen production and separation is outlined. </LI> <LI> Gas separation membrane technology for CO<SUB>2</SUB> removal is suggested. </LI> <LI> Algae cultivation using the CO<SUB>2</SUB> removed and biohydrogen effluent is assessed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Effects of anti-foaming agents on biohydrogen production
Sivagurunathan, Periyasamy,Anburajan, Parthiban,Kumar, Gopalakrishnan,Bakonyi, Pé,ter,Nemestó,thy, Ná,ndor,Bé,lafi-Bakó,, Katalin,Kim, Sang-Hyoun Elsevier 2016 Bioresource technology Vol.213 No.-
<P><B>Abstract</B></P> <P>The effects of antifoaming agents on fermentative hydrogen production using galactose in batch and continuous operations were investigated. Batch hydrogen production assays with LS-303 (dimethylpolysiloxane), LG-109 (polyalkylene), LG-126 (polyoxyethylenealkylene), and LG-299 (polyether) showed that the doses and types of antifoaming agents played a significant role in hydrogen production. During batch tests, LS-303 at 100μL/L resulted in the maximum hydrogen production rate (HPR) and hydrogen yield (HY) of 2.5L/L-d and 1.08mol H<SUB>2</SUB>/mol galactose<SUB>added</SUB>, respectively. The following continuously stirred tank reactor operated at 12h HRT with LS-303 at 100μL/L showed a stable HPR and HY of 4.9L/L-d and 1.17mol H<SUB>2</SUB>/mol galactose<SUB>added</SUB>, respectively, which were higher than those found for the control reactor. Microbial community analysis supported the alterations in H<SUB>2</SUB> generation under different operating conditions and the stimulatory impact of certain antifoaming chemicals on H<SUB>2</SUB> production was demonstrated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Antifoaming agents types and dosages influence the hydrogen productivity. </LI> <LI> LS-303 and other agents at 100μL/L showed stimulatory effects on H<SUB>2</SUB> production. </LI> <LI> Increased cluster I <I>Clostridium</I> content at the low dosage attributed high H<SUB>2</SUB> yield. </LI> </UL> </P>
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