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Terá,n Hilares, Ruly,dos Santos, Jú,lio Cé,sar,Ahmed, Muhammad Ajaz,Jeon, Seok Hwan,da Silva, Silvio Silvé,rio,Han, Jong-In Elsevier 2016 Bioresource technology Vol.214 No.-
<P><B>Abstract</B></P> <P>Hydrodynamic cavitation (HC) was employed in order to improve the efficiency of alkaline pretreatment of sugarcane bagasse (SCB). Response surface methodology (RSM) was used to optimize pretreatment parameters: NaOH concentration (0.1–0.5M), solid/liquid ratio (S/L, 3–10%) and HC time (15–45min), in terms of glucan content, lignin removal and enzymatic digestibility. Under an optimal HC condition (0.48M of NaOH, 4.27% of S/L ratio and 44.48min), 52.1% of glucan content, 60.4% of lignin removal and 97.2% of enzymatic digestibility were achieved. Moreover, enzymatic hydrolysis of the pretreated SCB resulted in a yield 82% and 30% higher than the untreated and alkaline-treated controls, respectively. HC was found to be a potent and promising approach to pretreat lignocellulosic biomass.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydrodynamic cavitation (HC) was combined with an alkaline pretreatment. </LI> <LI> HC-assisted pretreatment was statistically optimized and experimentally verified. </LI> <LI> High enzymatic digestibility of 97.2% was achieved. </LI> <LI> The HC increased enzymatic digestibility by 30%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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>
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>
Bakonyi, Pé,ter,Koó,k, Lá,szló,Kumar, Gopalakrishnan,Tó,th, Gá,bor,Ró,zsenberszki, Tamá,s,Nguyen, Dinh Duc,Chang, Soon Woong,Zhen, Guangyin,Bé,laf Elsevier 2018 Journal of membrane science Vol.564 No.-
<P><B>Abstract</B></P> <P>Significant advances in the design of bioelectrochemical systems (BES) have promoted these applications to be seen as contemporary biotechnological platforms. However, notable issues in system architecture are still to be addressed and overcome, in particular concerning the membrane separators, which rely widely on polymers. These architectural components play a key-role in facilitating the transport of ions (i.e. protons) between the (compartments containing the) electrodes and therefore, their properties substantially influence the overall BES performance. This article aims presenting an up-to-date survey on the important accomplishments and promising outlooks with polymer-based membranes (both porous/non-porous, charged/uncharged) applied in BES (first and foremost microbial fuel cells, MFCs) that could drive this technology towards enhanced efficiency. Because of the interdisciplinary concept of BES, it attracts attention from scientists and engineers involved in environmental biotechnology, microbial electrochemistry and applied material sciences and as a result, this review paper would target the audience of these fields with particular interest on the progress with membrane separators fabricated with various polymeric materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Critical membrane separator properties in BES are assessed. </LI> <LI> Techniques for membrane/separator characterization are outlined. </LI> <LI> Various polymer-based membranes/separators used in BES are discussed. </LI> <LI> Status and challenges for membrane development in BES are evaluated. </LI> </UL> </P>
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>
Optimization of twin gear-based pretreatment of rice straw for bioethanol production
Ahmed, Muhammad Ajaz,Rehman, Muhammd Saif Ur,Terá,n-Hilares, Ruly,Khalid, Saira,Han, Jong-In Elsevier 2017 Energy conversion and management Vol.141 No.-
<P><B>Abstract</B></P> <P>A laboratory twin-gear reactor (TGR) was investigated as a new means for the pretreatment of high solid lignocelluloses. Response surface methodology based on Box Behnken Design was used to optimize the enzymatic digestibility with respect to the pretreatment process variables: temperature of 50–90°C, NaOH concentration of 2–6% and no. of cycles of 30–60. The results revealed that the TGR-based pretreatment led to the significant structural alterations through increases in pore size, pore volume, cellulose crystallinity and surface area. SEM images also confirmed the surface modifications in the pretreated rice straw. A response surface quadratic model predicted 90% of the enzymatic digestibility, and it was confirmed experimentally and through the analysis of variance (ANOVA) as well. The TGR extrusion proved to be an effective means for exceedingly high solids lignocellulose.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Twin gear reactor is a continuous high solids pretreatment reactor. </LI> <LI> RSM was applied to optimize twin gear pretreatment for enzymatic digestibility. </LI> <LI> 89% enzymatic digestibility was achieved under optimum conditions. </LI> <LI> Thermomechanical pretreatment altered the structural features of rice straw. </LI> </UL> </P>
Gubicza, Jenő,Jenei, Pé,ter,Nam, Kyungju,Ká,dá,r, Csilla,Jo, Hyungyung,Choe, Heeman Elsevier 2018 Materials science & engineering. properties, micro Vol.725 No.-
<P><B>Abstract</B></P> <P>Experiments were conducted to study the compression behavior of Cu-Ni foams prepared using freeze casting. The struts of the foam samples were solid-solutioned with differing Cu/Ni ratios, after which the grain size in the struts was measured using scanning electron microscopy. The compression performance of the samples was studied in both parallel and perpendicular directions to the temperature gradient, and compared with model calculations. It was confirmed that alloying increased the yield strength of the struts. The experimentally determined yield strength and elastic modulus were compared with model calculations, which revealed that the elastic modulus of the foams was lower than the values calculated from the classical compression and Gibson-Ashby models due to variation in the thickness of the struts. It was also found that the alloying of Cu and Ni improved the mechanical performance of the alloy foams because the absorbed energy for the alloys was considerably higher than that for the pure foams.</P>
Berkecz, Ró,bert,Ilisz, Istvá,n,Misicka, Aleksandra,Tymecka, Dagmara,Fü,lö,p, Ferenc,Choi, Hee Jung,Hyun, Myung Ho,Pé,ter, Antal WILEY-VCH Verlag 2009 Journal of Separation Science Vol.32 No.7
<P>RP high-performance liquid chromatographic methods were developed for the enantioseparation of eleven unusual β<SUP>2</SUP>-homoamino acids. The underivatized analytes were separated on a chiral stationary phase containing (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid as chiral selector. The effects of organic (alcoholic) and acidic modifiers, the mobile phase composition and temperature on the separation were investigated. The structures of the substituents in the α-position of the analytes substantially influenced the retention and resolution. The elution sequence was determined in some cases: the S enantiomers eluted before the R enantiomers.</P>