Base de dados : LILACS
Pesquisa : D20.147 [Categoria DeCS]
Referências encontradas : 102 [refinar]
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  1 / 102 LILACS  
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Id: biblio-1025045
Autor: Solarte-Toro, Juan Camilo; Chacón-Pérez, Yessica; Cardona-Alzate, Carlos Ariel.
Título: Evaluation of biogas and syngas as energy vectors for heat and power generation using lignocellulosic biomass as raw material
Fonte: Electron. j. biotechnol;33:52-62, May. 2018. tab, ilus.
Idioma: en.
Projeto: Departamento Administrativo de Ciencia, Tecnología e Innovación.
Resumo: The use of nonrenewable energy sources to provide the worldwide energy needs has caused different problems such as global warming, water pollution, and smog production. In this sense, lignocellulosic biomass has been postulated as a renewable energy source able to produce energy carriers that can cover this energy demand. Biogas and syngas are two energy vectors that have been suggested to generate heat and power through their use in cogeneration systems. Therefore, the aim of this review is to develop a comparison between these energy vectors considering their main features based on literature reports. In addition, a techno-economic and energy assessment of the heat and power generation using these vectors as energy sources is performed. If lignocellulosic biomass is used as raw material, biogas is more commonly used for cogeneration purposes than syngas. However, syngas from biomass gasification has a great potential to be employed as a chemical platform in the production of value-added products. Moreover, the investment costs to generate heat and power from lignocellulosic materials using the anaerobic digestion technology are higher than those using the gasification technology. As a conclusion, it was evidenced that upgraded biogas has a higher potential to produce heat and power than syngas. Nevertheless, the implementation of both energy vectors into the energy market is important to cover the increasing worldwide energy demand.
Descritores: Biocombustíveis/análise
Lignina/metabolismo
-Centrais Elétricas
Digestão Anaeróbia
Biomassa
Energia Renovável
Temperatura Alta
Lignina/química
Metano
Tipo de Publ: Revisão
Responsável: CL1.1 - Biblioteca Central


  2 / 102 LILACS  
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Id: biblio-1055430
Autor: Sandim, Álvaro A; Batista, Alexandre G; Bareta, Maria Luiza E; Betini, Roberto C; Pepplow, Luiz Amilton.
Título: Biogas and Biomass Implementation in Rural Areas
Fonte: Braz. arch. biol. technol;62(spe):e19190001, 2019. tab, graf.
Idioma: en.
Resumo: Abstract Advances in energy demand in rural areas cannot be dissociated from agricultural modernization, large estates, mechanization of labor and reduced investment in small production. The use of biogas together with biomass are the most cost-effective ways for the small producer, as it has a high calorific value. In the case of biogas the procedure is performed by combining a compressor and a chiller, allowing the gas enter the reactor and burn together with the air stream. The use of these techniques is an auxiliary way to reduce the cost of the producer to produce a certain crop, besides allowing a participation in the final energy supply, so that the utilities have an alternative to distribute the surplus energy to another region, serving thus a wider range in the rural area.
Descritores: Zona Rural
Biomassa
Eletricidade
Biocombustíveis
Responsável: BR1.1 - BIREME


  3 / 102 LILACS  
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Id: biblio-1055431
Autor: Mancini, Fabrízio Nicolai; Milano, Jackson; Araújo, Joilson Gonçalves de; Iastrenski, Karen Techy; Silveira, Nicolli Sperança; Pertile, Rodrigo Creuz.
Título: Energy Potential of Animal Waste in the State of Paraná (Brazil)
Fonte: Braz. arch. biol. technol;62(spe):e19190009, 2019. tab.
Idioma: en.
Resumo: Abstract Animal biomass is a source of energy commonly discarded without or with low utilization, but its availability draws attention to its reuse [1]. The utilization can be carried out in different ways, varying in terms of generation time and efficiency. The use of biodigestion requires a relatively small area compared to landfills or natural composting, and it provides other materials besides biogas, that can be recycled as fertilizer and has a short residence time of residues [2]. The energy supplied as biogas can be harnessed as heat or electricity in case of conversion. Considering the energy needs of animal husbandry and the ease of reinsertion of energy in the production cycle, the possibility of distributed generation of biogas was studied as a way to complement the rural energy consumption matrix. Poultry farms require heat for chicks [3], dairy production centers require sterilization of used equipment [4] and pig farms require good heating systems to ensure animal weight gain [5]. In this way, the production can take advantage of the heat of the gas without the conversion into electricity, minimizing losses. Creation centers themselves can also generate electricity, eliminating the need for large transmission lines.
Descritores: Biomassa
Consumo de Energia
Digestores de Biogás
Biocombustíveis
-Zona Rural
Responsável: BR1.1 - BIREME


  4 / 102 LILACS  
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Id: biblio-1051225
Autor: Swiatek, Michal; Lewicki, Andrzej; Szymanowska, Daria; Kubiak, Piotr.
Título: The effect of introduction of chicken manure on the biodiversity and performance of an anaerobic digester
Fonte: Electron. j. biotechnol;37:25-33, Jan. 2019. tab, graf, ilus.
Idioma: en.
Projeto: National Centre for Research and Development (NCBR).
Resumo: Background: Ammonium stress is a prime limiting phenomenon that occurs during methane formation from poultry manure. It is caused by elevated ammonium nitrogen concentrations that result from substrate decomposition. The amounts of methane formed depend on the activity of methanogenic microbes. Results: During the research reported in this paper, the response of a mesophilic consortium inhabiting a biogas reactor to rising load of poultry manure was investigated. The taxonomic composition of bacterial population was mostly typical, however syntrophic bacteria were not detected. This absence resulted in limitation of succession of some methanogenic microorganisms, especially obligate hydrogenotrophs. The methanogenic activity of the consortium was totally dependent on the activity of Methanosaeta. Inhibition of methanoganesis was noticed at ammonium nitrogen concentration of 3.68 g/L, total cessation occurred at 5.45 g/L. Significant amounts of acetic acid in the fermentation pulp accompanied the inhibition. Conclusions: The effectiveness of the consortium was totally dependent on the metabolic activity of the acetoclastic Methanoseata genus and lack of SAOB did not allow hydrogenotrophic methanogens to propagate and lead to cessation of biogas production at an elevated ammonium concentration at which acetoclastic methanogens were inhibited.
Descritores: Methanosarcinaceae/metabolismo
Biocombustíveis
Microbiota
Anaerobiose
-Aves Domésticas
Estresse Fisiológico
Reação em Cadeia da Polimerase
Impressões Digitais de DNA
Cromatografia Líquida de Alta Pressão
Archaea/metabolismo
Biodiversidade
Fermentação
Consórcios Microbianos
Compostos de Amônio
Esterco
Metano
Nitrogênio
Responsável: CL1.1 - Biblioteca Central


  5 / 102 LILACS  
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Id: biblio-1132152
Autor: Kanakdande, Amruta; Agrwal, Divya; Khobragade, Chandrahasya.
Título: Pineapple Waste and Wastewater: Route for Biodiesel Production from Candida tropicalis (MF510172)
Fonte: Braz. arch. biol. technol;62:e19180499, 2019. graf.
Idioma: en.
Resumo: Abstract: The aim of the present study was to utilize waste resources for biodiesel production and to test its recyclability. The oleaginous yeast was isolated from local municipal wastewater outlet and on the basis of 18S r RNA sequencing, isolate was identified as Candida tropicalis (MF510172). Optimum fermentation conditions for lipid yield was recorded to be at 180 rpm agitation speed, 6% pineapple waste as a carbon source, 5% inoculum size,48 h inoculum age at 40°C temperature with 72 h incubation time. Candia was able to produce 13 ml. L-1 lipids using optimum conditions. Extracted lipids were transesterified to form fatty acid methyl esters (FAME) and further characterized by using GC-MS and FTIR spectroscopy. Palmitic acid methyl esters and other supplementary hydrocarbon compounds were identified using GC-MS. FTIR spectrum indicates the characteristics FAME peak at 1740 cm-1 with C= O stretching band of methyl esters. The results clearly demonstrate the waste resources containing filtered wastewater and pineapple waste used in the study are effective to produce quality oil for biodiesel production.
Descritores: Uso de Resíduos Sólidos
Ananas
Biocombustíveis
Fermentação
Responsável: BR1.1 - BIREME


  6 / 102 LILACS  
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Id: biblio-1249210
Autor: Matos, Ângelo Paggi.
Título: Advances in Microalgal Research in Brazil
Fonte: Braz. arch. biol. technol;64:e21200531, 2021. tab, graf.
Idioma: en.
Projeto: Conselho Nacional de Desenvolvimento Científico e Tecnológico.
Resumo: Abstract Microalgae research has attracted interest worldwide and in order to advance algal biotechnology in Brazil, government has been funding several projects. In the last 10 years, two main funds were provided by the National Council of Scientific and Technological Development (CNPq) agency to researchers in Brazil, who study the potential uses of microalgae for biomass, bioproducts and biofuels production. These funded projects addressed aspects of algal strain identification, development of algal cultivation techniques, designing photobioreactors and raceway ponds, modeling harvesting and dewatering process, maximizing biomass and oil productivities, characterizing chemical composition with different extractions systems and determining physiochemical properties of biodiesel. This review presents the state of art of algal research conducted by Brazilian institutions. Special attention is given to the recent progress on microalgal cultivation, high-value products extracted from microalgae and potential biofuels production. This review may serve as a policy instrument for planning next steps for algal research in Brazil as well as for attracting attention from international researchers who work with microalgae and would like to pursue a future partnership on algal research with Brazilian research institutions.
Descritores: Biotecnologia/métodos
Biocombustíveis
Microalgas
Fotobiorreatores
Responsável: BR1.1 - BIREME


  7 / 102 LILACS  
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Id: biblio-1278441
Autor: Mantovan, Fabiana de Marqui; Zenatti, Dilcemara Cristina; Burin, Eduardo Lucas Konrad.
Título: Effect of Agitation on Anaerobic Co-Digestion of Swine Manure and Food Waste
Fonte: Braz. arch. biol. technol;64:e21200102, 2021. tab, graf.
Idioma: en.
Resumo: Abstract The synergism of food waste associated with swine manure can provide an increase in biogas production, besides promoting greater stability in the anaerobic co-digestion process. To verify this effect, co-digestion tests were performed in two reactors, one with agitation, and the other without agitation. In both systems, gasometers were used to measure biogas production in an experiment lasting two hydraulic retention times (HRT). On each feeding day, the temperatures of the ambient and of the effluent taken from the reactors were measured, and samples of the food waste and effluent were collected to perform analysis of pH, total solids (TS), volatile solids (VS), fixed solids (FS), volatile acidity (AV), and total alkalinity (TA). In addition, the chemical oxygen demand (COD) was determined every five days, and gas composition was determined at the beginning of the second HRT. As important results, in both reactors a decrease in pH was verified due to the weakening of the buffer effect of the medium. This was due to the low alkalinity found in the food waste, causing an increase in acidity in the contents of the reactors. The volume of biogas produced was higher in the reactor with agitation, which meant an increased efficiency of the process. Finally, a low methane content was verified through chromatographic analyses, indicating a reduction in the activity of the microorganisms present in the medium. Thus, it is concluded that agitation linked to anaerobic co-digestion of swine manure with food waste exerted a positive effect on biogas production.
Descritores: Desperdício de Alimentos
Biocombustíveis
Resíduos de Alimentos
-Digestão Anaeróbia
Lodos Ativados
Responsável: BR1.1 - BIREME


  8 / 102 LILACS  
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Id: lil-635730 LILACS-Express
Autor: Arboleda Montaño, Nixon.
Título: La palma africana en el pacífico Colombiano: su ilegalidad, consecuencias y violación de derechos territoriales / African oil palm in the Colombian pacific coast: its illegality, consequences annd violation of territorial rights
Fonte: Rev. luna azul;(27):113-126, dic. 2008.
Idioma: es.
Resumo: La gran biodiversidad presente en el pacífico colombiano ha sido y está siendo devastada por la agroindustria de la palma africana (revitalizada con el auge de los agrocombustibles); de igual forma se han presentado graves problemas de pérdida y violación de derechos sobre el territorio (protegido por la ley 70 de 1993 y la constitución de 1991), desplazamiento y cambio en las condiciones de vida de la comunidad local (en su mayoría afrocolombiana); y se ha negado la posibilidad de gestar su propio desarrollo a los pobladores del litoral pacífico.

The great biodiversity present in the Colombian Pacific Coast has been and is being devastated by the agroindustry of African palm (revitalized by the biofuels boom). Additionally, severe problems regarding the violation of territorial rights (protected by Law 70 of 1993 and the 1991 Political Constitution) have arisen, as well as displacement and changes in the life conditions of the local community (mostly Afro-Colombian). This Pacific Coast community has been denied the possibility of creating their own development.
Descritores: Biodiversidade
-Condições Sociais
Agroindústria
Biocombustíveis
Limites: Humanos
Tipo de Publ: Artigo Clássico
Responsável: CO54.1 - Centro de Biblioteca e Información Científica


  9 / 102 LILACS  
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Id: lil-677396 LILACS-Express
Autor: TEJADA TOVAR, CANDELARIA; TEJEDA BENÍTEZ, LESLY; VILLABONA ORTIZ, ÁNGEL; MONROY RODRÍGUEZ, LUIS.
Título: Obtención de biodiesel a partir de diferentes tipos de grasa residual de origen animal / Extractin biodieesel from different types of animal origin residual fat
Fonte: Rev. luna azul;(36):10-25, ene.-jun. 2013. ilus, tab.
Idioma: es.
Resumo: Se estudian diferentes posibilidades de obtención de biodiesel a partir de residuos grasos generados en la explotación pecuaria: grasa de pollo, cerdo, y vacuna, para ello se analizan las variables relación molar alcohol/grasa animal y cantidad de catalizador, puesto que son las que más inciden en la calidad del biodiesel, al evaluar sus características y rendimientos de la reacción de transesterificación. El rendimiento en el proceso de extracción de la grasa de material de desecho de pollo es del 70,5%, y de la grasa de cerdo del 90%, por lo que se plantean como alternativas viables desde el punto de vista técnico, permitiendo la valorización de estos desechos orgánicos y aliviando la contaminación generada en este tipo de industrias. De la caracterización realizada a la grasa de pollo y cerdo se pudo establecer que ambas materias primas son de baja acidez lo cual garantiza un alto grado de transesterificación, teniendo en cuenta que tuvo un rendimiento del 96% a partir de la grasa de pollo y del 91,2% a partir de la grasa de cerdo. Del análisis cromatográfico del biodiesel sintetizado se obtuvo que el ácido graso más común fue el del ácido oleico.

Different possibilities of extracting biodiesel from fat residues generated on farm livestock: chicken, pork, and bovine fat, were studied. To do this, the variables molar ratio alcohol/animal fat and amount of catalyst are analyzed, since those are the ones which most affect the quality of biodiesel when assessing the characteristics and efficiency of the transesterification reaction. The efficiency in the poultry waste material extraction process is 70.5%, and in pork fat is 90%, reason why they are proposed as feasible alternatives from the technical standpoint, allowing the recovery of this organic waste, thus alleviating the pollution generated by this type of industry. From the characterization performed on chicken and pork fat, it has been established that this raw material has low acidity which ensures a high degree of transesterification, taking into account that it had 96% efficiency from chicken fat and 91.2% from pork fat. From the synthesized biodiesel Chromatographic analysis it was found that the most common fatty acid was oleic acid.
Descritores: Biocombustíveis
-Esterificação
Catalisador
Animais
Limites: Humanos
Tipo de Publ: Artigo Clássico
Responsável: CO54.1 - Centro de Biblioteca e Información Científica


  10 / 102 LILACS  
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Id: biblio-1132193
Autor: Dudek, Débora Nakadomari; Bueno, Indianara Kawana; Rasbold, Leticia Mara; Pagnonceli, Juliana; Corrêa, Juliana Moço; Silva, José Luis da Conceição; Kadowaki, Marina Kimiko; Simão, Rita de Cássia Garcia; Silva, Roberto Nascimento; Maller, Alexandre.
Título: Enhance of Cellulase Production and Biomass Degradation by Transformation of the Trichoderma reesei RUT-C30∆ zface1 Strain
Fonte: Braz. arch. biol. technol;63:e20190185, 2020. tab, graf.
Idioma: en.
Projeto: National Council for Scientific and Technological Development.
Resumo: Abstract The second-generation bioethanol employs lignocellulosic materials degraded by microbial cellulases in their production. The fungus Trichoderma reesei is one of the main microorganisms producing cellulases, and its genetic modification can lead to the optimization in obtaining hydrolytic enzymes. This work carried out the deletion of the sequence that encodes the zinc finger motif of the transcription factor ACE1 (cellulase expression repressor I) of the fungus T. reesei RUT-C30. The transformation of the RUT-C30 lineage was confirmed by amplification of the 989 bp fragment relative to the selection marker, and by the absence of the zinc finger region amplification in mutants, named T. reesei RUT-C30Δzface1. The production of cellulases by mutants was compared to RUT-C30 and measured with substrates carboxymethylcellulose (CMC), microcrystalline cellulose (Avicel®) and Whatman filter paper (PF). The results demonstrated that RUT-C30Δzface1 has cellulolytic activity increased 3.2-fold in Avicel and 2.1-fold in CMC and PF. The mutants presented 1.4-fold higher sugar released in the hydrolysis of the biomass assays. These results suggest that the partial deletion of ace1 gene is an important strategy in achieving bioethanol production on an industrial scale at a competitive price in the fuel market.
Descritores: Trichoderma/enzimologia
Celulase/biossíntese
Dedos de Zinco
Biomassa
Etanol
Biocombustíveis
Responsável: BR1.1 - BIREME



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