The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
A. Sanromán - One of the best experts on this subject based on the ideXlab platform.
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Improving laccase production by employing different Lignocellulosic Wastes in submerged cultures of Trametes versicolor.
Bioresource Technology, 2002Co-Authors: M. Lorenzo, Diego Moldes, S. Rodríguez Couto, A. SanrománAbstract:Laccase production by the white-rot fungus Trametes versicolor (CBS100.29) grown in submerged cultures was studied. Addition of different insoluble Lignocellulosic materials into the culture medium in order to enhance laccase production was investigated. The Lignocellulosic materials were grape seeds, grape stalks and barley bran, selected because of their availability and low cost, since they are agro-industrial Wastes abundant in most countries. Barley bran gave the highest activities, a maximum value of 639U/l, which was 10 times the value attained in the cultures without Lignocellulosics addition. The decolourisation of a model dye, Phenol Red, by the ligninolytic fluids obtained in the above-mentioned cultures was investigated. Grape stalk and barley bran cultures showed the highest ability to decolourise the dye, attaining a percentage of decolourisation of around 60% in 72 h.
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Utilisation of Lignocellulosic Wastes for lignin peroxidase production by semi-solid-state cultures of Phanerochaete chrysosporium
Biodegradation, 2001Co-Authors: S. Rodríguez Couto, A. Domínguez, A. SanrománAbstract:In the present work, the production of ligninolytic enzymes by semi-solid-statecultures of Phanerochaete chrysosporium BKM-F-1767 (ATCC 24725),employing different Lignocellulosic Wastes as support, was investigated. Thewaste materials employed were grape seeds, wheat straw and wood shavings.Maximum lignin peroxidase activities of 1620 ± 123 U/l, 364 ± 35 U/l and 571 ± 42 U/l were attained, respectively. Nevertheless, lowmanganese-dependent peroxidase activities were found, being insignificantin the grape seed cultures. Moreover, the in vivo decolourisation of a model dye compound, the polymeric dye Poly R-478 (polyvinylamine sulfonateanthrapyridone), by the above-mentioned cultures was monitored to assessthe degrading capability of the extracellular liquid secreted by such cultures.The percentage of biological decolourisation attained by grape seed and woodshaving cultures was around 74% and 63%, respectively, whereas it was ratherlow (40%) in the wheat straw ones.
J Moreno - One of the best experts on this subject based on the ideXlab platform.
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the effect of aeration on the biotransformation of Lignocellulosic Wastes by white rot fungi
Bioresource Technology, 2002Co-Authors: M J Lopez, M A Elorrieta, M C Vargasgarcia, F Suarezestrella, J MorenoAbstract:The mineralisation and the humification of organic matter (OM) in sterile horticultural plant Wastes inoculated with Coriolus versicolor or Phanerochaete flavido-alba was investigated under different aeration rates in order to determine their efficacy as potential inoculants for composting. The change in elemental composition, lignin content and OM fractions was analysed during a 90-day incubation. Both fungi degraded 30% of lignin at low aeration rates. Different aeration rates led to significant changes in OM mineralisation induced by C. versicolor, but did not have noticeable effect on P. flavido-alba activity. The mineralisation was more effectively carried out by P. flavido-alba than by C. versicolor. Lignin degradation and the linked humification process were equally achieved by the two fungi and were enhanced in aerated conditions. The fungi analysed may facilitate the composting of Lignocellulosic Wastes by means of an increase in substrate bioavailability and OM humification.
Rosa Rodriguez - One of the best experts on this subject based on the ideXlab platform.
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macro tga steam assisted gasification of Lignocellulosic Wastes
Journal of Environmental Management, 2019Co-Authors: Anabel Fernandez, Rosa Rodriguez, Jose Miguel Soria, Jan Baeyens, Germán MazzaAbstract:Abstract The kinetics of the steam-assisted gasification for three different agro-industrial solid Wastes (sawdust, olive and plum pits) was studied by macro thermo-gravimetric analysis (macro-TGA) at different heating rates (5, 10 and 15 K/min). The progressive CO release was moreover monitored to fully identify each step of the global gasification process. A single-step kinetics modelling was applied by using the Coats-Redfern method, with both a first order model for pyrolysis and a Ginstling - Brounstein 3D-diffusion model for the gasification stages, respectively. A comparison between macro-TGA and previous TGA results for the same bio-Wastes was performed. Results indicated that the reaction proceeds in three well-defined and subsequent stages, involving water evaporation [298–473 K], biomass de-volatilization [473–648 K] with the highest production of CO, and char gasification as final step. Reaction rate parameters of the Arrhenius equation were determined for both the pyrolysis and gasification steps.
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Air-steam gasification of five regional Lignocellulosic Wastes: Exergetic evaluation
Sustainable Energy Technologies and Assessments, 2019Co-Authors: Marcelo Echegaray, Daniela Zalazar García, Germán Mazza, Rosa RodriguezAbstract:Abstract This study presents a thermodynamic model for describing the five Wastes gasification behavior with char and tar formation. Influence of variables process on the exergetic efficiency and sustainability index was considered. In order to validate, carbon monoxide release was registered and a good fit was determined. Considering the CO content in the syngas, at 850 °C, the maximum value was observed for the marc (CO mole-percentage = 17.77%) and the minimum concentration was founded for the Pistacia vera kerman’s mesocarp (CO mole-percentage = 11.37%). However, at 650 °C, the maximum CO content was observed for the Pistacia vera kerman’s exocarp (CO mole-percentage = 9.8%) and the minimum value was founded for the Pistacia vera kerman’s mesocarp (CO mole-percentage = 4.28%). Marcs has the highest exergetic efficiency, and pistachio exocarp, the lowest value. Exergetic efficiency and sustainability index decrease increasing the equivalence ratio, but, increasing the temperature; these parameters augment. Higher exergetic efficiencies are obtained via air's use than air-steam mixture's use, which is attributable to the required energy to transform water into steam. Nevertheless, its influence on the exergetic efficiency and sustainability index is not very important.
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thermal decomposition under oxidative atmosphere of Lignocellulosic Wastes different kinetic methods application
Journal of environmental chemical engineering, 2018Co-Authors: Anabel Fernandez, Germán Mazza, Rosa RodriguezAbstract:Abstract Combustion of six Lignocellulosic Wastes was studied using thermogravimetric analysis. Experimental data were analyzed using different kinetic methods Kissinger, FWO, DAEM linear multiple regression methods and Coast Redfern method. Also, their thermodynamic parameters (ΔG, ΔH, ΔS) were obtained. The activation energy (E) and the pre-exponential factor (A) values calculated by the DAEM, FWO and Kissinger methods were higher than those obtained by the linear multiple regression and Coast Redfern methods. The E values obtained from the Kissinger method are consistent with the range of values obtained by the FWO and DAEM methods and are very near to their average values (between 52.75 and 116.92 kJ/mol for all studied agro-industrial Wastes). DAEM and FWO methods provides E and A distributions, detecting multi-step kinetics. However, Kissinger method provides only one E and A values for all heating rates, similar to obtained values applying DAEM and FWO methods. The linear multiple regression method provides the knowledge of kinetic triplets for each studied heating rate, presenting a slower fit than the other methods. On the other hand, Coast Redfern method supplies these triplets and the reaction mechanisms. However, using this method, the obtained E values are very different to the calculated values applying isoconversional methods. Using the last mentioned methods, the models of volume contraction and first order describe the devolatilization and char combustion stages, respectively. The obtained thermodynamic parameters values show that the Lignocellulosic Wastes combustion has a low reaction favorability.
G V Chowdary - One of the best experts on this subject based on the ideXlab platform.
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simultaneous saccharification and fermentation of Lignocellulosic Wastes to ethanol using a thermotolerant yeast
Bioresource Technology, 2001Co-Authors: Hari S Krishna, Janardhan T Reddy, G V ChowdaryAbstract:Simultaneous saccharification and fermentation (SSF) studies were carried out to produce ethanol from Lignocellulosic Wastes (sugar cane leaves and Antigonum leptopus leaves) using Trichoderma reesei cellulase and yeast cells. The ability of a thermotolerant yeast, Kluyveromyces fragilis NCIM 3358, was compared with Saccharomyces cerevisiae NRRL-Y-132. K. fragilis was found to perform better in the SSF process and result in high yields of ethanol (2.5-3.5% w/v) compared to S. cerevisiae (2.0-2.5% w/v). Increased ethanol yields were obtained when the cellulase was supplemented with beta-glucosidase. The conversions with K. fragilis were completed in a short time. The substrates were in the following order in terms of fast conversions: Solka floc > A. leptopus > sugar cane.
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simultaneous saccharification and fermentation of Lignocellulosic Wastes to ethanol using a thermotolerant yeast
Bioresource Technology, 2001Co-Authors: Hari S Krishna, Janardhan T Reddy, G V ChowdaryAbstract:Abstract Simultaneous saccharification and fermentation (SSF) studies were carried out to produce ethanol from Lignocellulosic Wastes (sugar cane leaves and Antigonum leptopus leaves) using Trichoderma reesei cellulase and yeast cells. The ability of a thermotolerant yeast, Kluyveromyces fragilis NCIM 3358, was compared with Saccharomyces cerevisiae NRRL-Y-132. K. fragilis was found to perform better in the SSF process and result in high yields of ethanol (2.5–3.5% w/v) compared to S. cerevisiae (2.0–2.5% w/v). Increased ethanol yields were obtained when the cellulase was supplemented with β-glucosidase. The conversions with K. fragilis were completed in a short time. The substrates were in the following order in terms of fast conversions: Solka floc > A. leptopus > sugar cane.
M. Lorenzo - One of the best experts on this subject based on the ideXlab platform.
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different proportions of laccase isoenzymes produced by submerged cultures of trametes versicolor grown on Lignocellulosic Wastes
Biotechnology Letters, 2004Co-Authors: Diego Moldes, M. Lorenzo, M A SanromanAbstract:The white-rot fungus Trametes versicolor grown in submerged culture produced two laccase isoenzymes, LacI and LacII. Addition of insoluble Lignocellulosic materials into the culture medium increased the total laccase activity. The proportion of laccase isoenzymes also changed depending on the Lignocellulosic material employed, with ratios of activity LacII/LacI from 0.9 (barley straw) to 4.4 (grape stalks). Besides, this proportion played an important role in the dye decolourisation.
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Improving laccase production by employing different Lignocellulosic Wastes in submerged cultures of Trametes versicolor.
Bioresource Technology, 2002Co-Authors: M. Lorenzo, Diego Moldes, S. Rodríguez Couto, A. SanrománAbstract:Laccase production by the white-rot fungus Trametes versicolor (CBS100.29) grown in submerged cultures was studied. Addition of different insoluble Lignocellulosic materials into the culture medium in order to enhance laccase production was investigated. The Lignocellulosic materials were grape seeds, grape stalks and barley bran, selected because of their availability and low cost, since they are agro-industrial Wastes abundant in most countries. Barley bran gave the highest activities, a maximum value of 639U/l, which was 10 times the value attained in the cultures without Lignocellulosics addition. The decolourisation of a model dye, Phenol Red, by the ligninolytic fluids obtained in the above-mentioned cultures was investigated. Grape stalk and barley bran cultures showed the highest ability to decolourise the dye, attaining a percentage of decolourisation of around 60% in 72 h.