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      Finding the optimal parameters for the steam explosion process of hay Translated title: Busca de los parámetros óptimos para la extrusión de biogás del heno

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          Abstract

          Combining biochemical principles and mathematical methods were defined optimal extrusion (steam explosion) process conditions for pelleted hay resulting in maximal cumulative production of biogas (CBGP). Operating experiments were conducted on a continuous modifiable extruder. Variable parameters, the reaction time, pressure and dry mass were compared and optimized. An assumption that longer reaction time, lower dry mass and higher operating pressure results in higher yields of biogas were confirmed only in defined pressure range. Critical conditions, from where the yield starts to decrease due to inhibitors formations were also modeled. It was found that the optimal process conditions were in the neighborhood of pressure 1.3 MPa, reaction time 7 minutes and 8% of dry mass resulting in 405 m³ of biogas (52.3% CH4) per ton of dry mass.

          Translated abstract

          En el presente estudio se compararon las diferentes condiciones de reacción para el proceso de la extrusión (también conocido como explosión de vapor) del heno. Los experimentos de funcionamiento se llevaron a cabo en una extrusora continua y modificable con el fin de encontrar parámetros óptimos. El factor principal de la optimización fue la profundidad de la desintegración de material vegetal comprobada durante 30 días de la producción acumulada de biogás (CBGP). Los parámetros de la extrusión fueron retrasos en la extrusora, hydromodul y presión. La vinculación de los principios bioquímicos y los métodos matemáticos se han encontrado como las condiciones óptimas para el máximo rendimiento de la tecnología del biogás. La suposición de que el proceso de alta presión aumenta los rendimientos de biogás se confirmó sólo en determinadas áreas. Fueron modelados límites, en los que con la presión creciente los rendimientos de la producción de biogás disminyen, debido a la producción de los inhibidores del proceso anaerobio. Se demostró que las condiciones de proceso óptimo paragránulos (pellets) del heno se encuentran alrededor de presión 1,3 MPa, de tiempo de residencia en extrusora 7 minutos, 8% de materia seca. Obtenida extrusora crea 405 m³ biogás (52,3% CH4) por tonelada de materia seca.

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          Bioethanol, biohydrogen and biogas production from wheat straw in a biorefinery concept.

          The production of bioethanol, biohydrogen and biogas from wheat straw was investigated within a biorefinery framework. Initially, wheat straw was hydrothermally liberated to a cellulose rich fiber fraction and a hemicellulose rich liquid fraction (hydrolysate). Enzymatic hydrolysis and subsequent fermentation of cellulose yielded 0.41 g-ethanol/g-glucose, while dark fermentation of hydrolysate produced 178.0 ml-H(2)/g-sugars. The effluents from both bioethanol and biohydrogen processes were further used to produce methane with the yields of 0.324 and 0.381 m(3)/kg volatile solids (VS)(added), respectively. Additionally, evaluation of six different wheat straw-to-biofuel production scenaria showed that either use of wheat straw for biogas production or multi-fuel production were the energetically most efficient processes compared to production of mono-fuel such as bioethanol when fermenting C6 sugars alone. Thus, multiple biofuels production from wheat straw can increase the efficiency for material and energy and can presumably be more economical process for biomass utilization.
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            Pretreatments to enhance the digestibility of lignocellulosic biomass

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              Swelling of compressed cellulose fiber webs in organic liquids

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                Author and article information

                Contributors
                Role: ND
                Journal
                rtfiuz
                Revista Técnica de la Facultad de Ingeniería Universidad del Zulia
                Rev. Téc. Ing. Univ. Zulia
                Facultad de Ingeniería, Universidad del Zulia
                0254-0770
                August 2012
                : 35
                : 2
                : 170-178
                Affiliations
                [1 ] University of South Bohemia Czech Republic
                Article
                S0254-07702012000200006
                7dd73bf3-6dcd-4468-9acf-fd8fd1e80921

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Venezuela

                Self URI (journal page): http://www.scielo.org.ve/scielo.php?script=sci_serial&pid=0254-0770&lng=en
                Categories
                ENGINEERING, MULTIDISCIPLINARY

                General engineering
                dinámica de extrusión,optimización de procesos,producción de biogás,extrusion dynamics,process optimization,biogas production

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