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    Wyświetlanie 1-9 z 9
    Tytuł:
    Pre-treatment of biomass by torrefaction - preliminary studies
    Toryfikacja jako proces obróbki biomasy - badania wstępne
    Autorzy:
    Witczak, M.
    Walkowiak, M.
    Cichy, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/52855.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    biomass pretreatment
    biomass
    torrefaction process
    pretreatment process
    pelletization process
    pellet
    Opis:
    Torrefaction is a mild pre-treatment of biomass at the temperatures range from 200°C to 300°C. This report presents preliminary studies of torrefaction process for different types of raw material. A torrefied product has a brown/black colour, reduced moisture content, and increased heating value (HHV and LHV). It has favourable properties for application as a fuel for gasification and combustion.
    Przedstawiono wyniki uzyskane w trakcie wstępnych badań procesu toryfikacji wybranych materiałów lignocelulozowych. Otrzymane produkty toryfikowane charakteryzowały się brązowo-czarną barwą, niską wilgotnością oraz podwyższoną wartością ciepła spalania i wartością opałową, co wpływało korzystnie na poprawę właściwości paliwowych badanych próbek biomasy. Toryfikacja jest procesem łagodnej obróbki wstępnej biomasy, zachodzącym w temperaturze 200-300°C pod ciśnieniem atmosferycznym w atmosferze gazu obojętnego. Wydajność masy i energii procesu toryfikacji jest zależna od temperatury, czasu oraz typu biomasy poddawanej toryfikacji. Prędkość wzrostu temperatury procesu, według danych literaturowych, nie przekracza 50°C na minutę, a czas jego trwania oscyluje najczęściej w granicach jednej godziny. W trakcie toryfikacji następuje częściowa dekompozycja biomasy z wydzieleniem produktów lotnych. Pożądany produkt toryfikacji jest ciałem stałym, określanym jako biomasa toryfikowana. Uzyskane wyniki pozwalają na planowanie dalszych prac badawczych w tym zakresie.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2011, 54, 185
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical hydrolysis of hemicellulose from sugarcane bagasse. A comparison between the classical sulfuric acid method with the acidic ionic liquid 1-ethyl-3-methylimidazolium hydrogen sulfate
    Autorzy:
    Rodrigues, Marcoaurélio Almenara
    da Costa Lopes, André M.
    Lukasik, Rafal M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201973.pdf
    Data publikacji:
    2023
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    sugarcane bagasse
    acidic ionic liquids
    biomass pretreatment
    dilute sulfuric acid
    pentose
    furfural
    wytłoki trzciny cukrowej
    kwaśne ciecze jonowe
    wstępna obróbka biomasy
    rozcieńczony kwas siarkowy
    pentoza
    Opis:
    Dilute sulfuric acid and acidic ionic liquids are pretreatment methods used to selectively hydrolyze hemicellulose from lignocellulosic biomasses. In this work, a comparison between these techniques is carried out by treating sugarcane bagasse both with 1-ethyl-3-methylimidazolium hydrogen sulfate at different ionic-liquid and water contents and with H 2 SO 4 at the same conditions and equivalent ionic liquid molar contents. Results from the use of ionic liquid showed that it was possible to tune the biomass treatment either to achieve high hemicellulose hydrolysis yields of 72.5 mol% to very low furan and glucose co-production, or to obtain furfural at moderate yields of 18.7 mol% under conditions of low water concentration. In comparison to the use of ionic liquid, sulfuric acid pretreatment increased hemicellulose hydrolysis yields by 17%, but the 8.6 mol% furfural yield was also higher, and these yields were obtained at high water concentration conditions. Besides, no such tuning ability of the biomass treatment conditions can be made.
    Źródło:
    Acta Innovations; 2023, 46; 35--53
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Temperature and Reaction Time on the Efficiency of Alkaline Pretreatment of Hay Biomass
    Autorzy:
    Zdeb, Magdalena
    Skóra, Aneta
    Pawłowska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1839082.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    lignocellulosic biomass
    hay
    alkaline pretreatment
    thermal pretreatment
    Opis:
    Low biodegradability caused by polymeric structure is the main barrier in the use of lignocellulosic materials in biofuels production by using biological methods. Pretreatment of the biomass is the way to improve the suitability of hardly biodegradable biomass for biogas or bioethanol production. Evaluation of the influence of thermal and thermochemical alkaline pretreatment on the efficiency of hydrolysis of hay (mixture of various grass species) was the aim of the study. The batch scale experiment was carried out with the use of NaOH and distilled water as solvents, and the changes in pretreatment time (2, 4 and 8 hours) and temperature (22 and 80°C) were also considered. The efficiency of biomass solubilisation was assessed based on the results obtained from the measurements of chemical oxygen demand (COD) and volatile fatty acids (VFA) concentration in the hydrolysates. The solubility of the biomass, expressed as a percentage of soluble COD in total COD, was calculated. The experiment showed that the highest solubilisation of hay biomass was observed at 80°C under alkaline conditions. In this case, the solubility of the COD was 3-times higher, and the VFA concentration in hydrolysates was 4-times higher in comparison to the distilled water-based test at 22°C. It was noted that time of the process significantly influenced the efficiency of biomass solubilisation only during the experiment carried out at 22°C. Extension of hydrolysis time from 2 to 8 hours increased the value of soluble COD of 70% and 55% for water and alkaline solvent, respectively. The process conducted at 80°C was not time-dependent over the considered period.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 2; 120-127
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectiveness of using physical pretreatment of lignocellulosic biomass
    Autorzy:
    Piątek, Milena
    Bartkowiak, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/27312631.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    biogas yield
    biomass conversion
    energy efficiency
    thermal efficiency
    lignocellulosic biomass
    ultrasonic pretreatment
    hydrothermal pretreatment
    Opis:
    Pretreatment is aimed at making lignin structures, which in turn causes decrystallisation and depolymerisation of cellulose. This treatment allows to increase the energy potential of substrates. A properly selected method allows for obtaining larger amounts of biogas with a high content of biomethane. The aim of the study was to analyse selected pretreatment methods (ultrasonic and hydrothermal) for biogas yield, including biomethane, and to demonstrate the effectiveness of obtaining additional electricity and heat from these methods. It was based on the literature data. On basis the study, the following information was obtained: average yield of biogas and biomethane before and after treatment, difference in yield of biogas and biomethane after treatment, and the effect of treatment on the substrate used. Moreover, an estimate was made of the effectiveness of obtaining additional electricity and heat from selected pretreatment methods compared to hard coal. Based on the analysis of the ultrasonic treatment analysis, it was shown that the best result was obtained with the ultrasound treatment of the mixture of wheat straw and cattle manure with the following parameters: frequency 24 kHz, temperature 44.30°C, time 21.23 s. This allowed a 49% increase in biogas production. The use of pretreatment would therefore allow the production of more electricity and heat capable of replacing conventional heat sources such as coal.
    Źródło:
    Journal of Water and Land Development; 2023, 58; 62--69
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simple and Combined Pretreatment of a Mixture of Forestry and Aromatic-Medicinal Plant Waste by Chemical, Physical and Enzymatic Methods
    Autorzy:
    Bendaoud, Ahmed
    Belkhiri, Abdelkhalek
    Maai, Mohamed
    Moubchir, Tarik
    Hmamou, Anouar
    Tlemcani, Sara
    Eloutassi, Noureddine
    Lahkimi, Amal
    Powiązania:
    https://bibliotekanauki.pl/articles/24201758.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    biomass
    lignocellulosic complex
    pretreatment
    cellulose
    plant waste
    Opis:
    Forestry waste (FW) extracted parts ofmedicinal-aromatic plant waste (EPW) and unused parts (UPW) are considered potential resources for energy recovery (their heating value of approximately 19 MJ/kg).In order to valorize lignocellulosic biomass, a pretreatment process is required to hydrolyze the recalcitrant lignocellulosic complex into fermentable simple sugars. The aim of this study is to determine the best method of pretreatment that takes into account treatment time, efficiency, and environmental friendliness. The mixture of FW, EPW, and UPW was treated by simple and combined treatment using different methods like acid sulfuric (Ac), steam explosion (SE), and enzymatic (E) (cellulase and hemicellulase).The results showed that the combined and simple Ac treatments are the mostefficient compared with SE and E treatments in the hydrolysis of polysaccharide of cellulose with a rate respectively of 90.5% and 77.6% and hemicellulose with a rate respectively of 80.63% and 87.14%. In addition, both of the preceding methods release an important rate of total phenolic compounds. Combined treatment demands high time but is friendly (approximately 1 day), and Ac treatment is less time-consuming (about 25 min) but harmful to the environment and causes the corrosion of equipment.In conclusion, combined treatment can be the best method and the high time required can be reduced with the progress of the research.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 4; 376--383
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical methods of microalgal biomass pretreatment
    Autorzy:
    Piasecka, A.
    Krzeminska, I.
    Tys, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/25591.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    biomass
    sonication
    microwave
    physical method
    microalga
    pretreatment
    lipid content
    Opis:
    The prospect of depletion of natural energy resources on the Earth forces researchers to seek and explore new and alternative energy sources. Biomass is a composite resource that can be used in many ways leading to diversity of products. Therefore, microalgal biomass offers great potential. The main aim of this study is to find the best physical method of microalgal bio- mass pretreatment that guarantees efficient lipid extraction. These studies identifies biochemical composition of microalgal biomass as source for biodisel production. The influence of drying at dif- ferent temperatures and lyophilization was investigated. In addi- tion, wet and untreated biomass was examined. Cell disruption (sonication and microwave) techniques were used to improve lipid extraction from wet biomass. Additionally, two different extrac- tion methods were carried out to select the best method of crude oil extraction. The results of this study show that wet biomass after sonication is the most suitable for extraction. The fatty acid com- position of microalgal biomass includes linoleic acid (C18:2), palmitic acid (C16:0), oleic acid (C18:1), linolenic acid (C18:3), and stearic acid (C18:0), which play a key role in biodiesel production.
    Źródło:
    International Agrophysics; 2014, 28, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of extrusion-cooking conditions on the physical properties of Jerusalem artichoke straw
    Autorzy:
    Kupryaniuk, K.
    Oniszczuk, T.
    Combrzyński, M.
    Wojtowicz, A.
    Mitrus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082947.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    pretreatment
    lignocellulosic biomass
    physical
    properties
    extrusion-cooking
    Jerusalem artichoke straw
    Opis:
    The paper presents the effect of extrusion-cooking conditions (moisture content and screw speed) on the physical properties of extruded Jerusalem artichoke straw. A single screw extruder was used for straw processing. Shredded Jerusalem artichoke straw moistened to 30, 40, and 50% was subjected to an extrusion-cooking process at various screw speeds (70, 90, and 110 rpm). Selected physical properties and pasting profile were tested. Significant differences were observed depending on the moisture content of the samples and the various screw speed on their physical properties. Notably, increased moisture content lowered the specific mechanical energy, increased processing efficiency, water solubility, peak viscosity and breakdown. The maximum efficiency and the highest breakdown was observed for the sample with 50% moisture content processed at an extruder screw speed of 90 rpm. The sample obtained at 30% moisture and at 90 rpm was characterized by the lowest efficiency and hot paste viscosity, and the highest specific mechanical energy. The results showed that the extrusion-cooking process yielded desirable changes to the structure of the analysed lignocellulosic biomass.
    Źródło:
    International Agrophysics; 2020, 34, 4; 441-449
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ionic liquids in the pretreatment of lignocellulosic biomass
    Autorzy:
    Rodríguez, Héctor
    Powiązania:
    https://bibliotekanauki.pl/articles/1429853.pdf
    Data publikacji:
    2021
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    ionic liquid
    biomass
    lignocellulose
    biorefinery
    pretreatment
    fractionation
    ciecz jonowa
    biomasa
    lignoceluloza
    biorafineria
    obróbka wstępna
    frakcjonowanie
    Opis:
    The pretreatment is a key step in the processing of lignocellulosic biomass for its transformation into chemicals and materials of biorenewable origin. Ionic liquids, with their characteristic set of unique properties, have the potential to be the basis of novel pretreatment processes with higher effectiveness and improved sustainability as compared to the current state-of-the-art processes. In this opinion paper, the author provides a perspective on possible processing strategies for this pretreatment with ionic liquids, identifying different advantages as well as challenges to be overcome.
    Źródło:
    Acta Innovations; 2021, 38; 23-36
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of wood rot wild mushrooms in bioethanol production from sawdust of sawmills of Oromia Forest and Wildlife Enterprise, Ethiopia
    Autorzy:
    Megersa, Shasho
    Powiązania:
    https://bibliotekanauki.pl/articles/1031748.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Bio-ethanol
    Cupressus lusitanica
    Ecalyptus globulus
    Lignocellulosic biomass
    Oromia Forest and Wildlife Enterprise
    hydrolysis
    pretreatment
    sawdust
    wood rot wild mushrooms
    Opis:
    In this research sawdust samples of Ecalyptus globulus and Cupressus lusitanica were evaluated for bioethanol productions. The sawdust samples were first pretreated with three white rot fungi alone and also by combining the white rot fungi with mild NaOH and steam. Both the fungal and combined pretreated samples were then hydrolyzed with hydrolytic enzymes from three cellulolytic wood rot fungi. Finally, the resulting sugars were fermented into bioethanol using S. cerevisae in anaerobic conditions. Results obtained, in general, indicated that bioethanol amount produced in all cases of sawdust management was significantly higher than the amount obtained from the un-pretreated sawdust samples (p<0.05). In both fungal alone and combined pretreated sawdust samples, higher ethanol yield was obtained from E. globulus than from C. lusitanica. Similarly, combination with NaOH showed better bioethanol yield over combination with steam. The highest alcohol concentration was obtained when pretreated NaOH-006-2G and hydrolyzed with enzymes from 033-1G and followed by results when pretreated with 005-1G and 003-2G, respectively, and hydrolyzed with enzymes from 033-1G.
    Źródło:
    World News of Natural Sciences; 2020, 29, 3; 185-197
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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