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Pesquisa : D02.455.326.146.571 [Categoria DeCS]
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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


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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


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Id: biblio-1052269
Autor: Feng, Shoushuai; Hou, Shaoxiang; Huang, Xing; Fang, Zheng; Tong, Yanjun; Yang, Hailin.
Título: Insights into the microbial community structure of anaerobic digestion of municipal solid waste landfill leachate for methane production by adaptive thermophilic granular sludge
Fonte: Electron. j. biotechnol;39:98-106, may. 2019. tab, graf, ilus.
Idioma: en.
Projeto: National Natural Science Foundation of China; . Social Development Projects of Jiangsu Province; . Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education; . Key Laboratory of Industrial Biotechnology, Ministry of Education; . Priority Academic Program Development of; . Jiangsu Higher Education Institutions, and Program of Introducing; . Talents of Discipline to Universities.
Resumo: BACKGROUND: The amount of municipal solid waste (MSW) gradually increased along with the rapid development of modern cities. A large amount of landfill leachate are generated with excessive chemical oxygen demand (COD), which create a great deal of pressure on the environment-friendly treatment process. Anaerobic digestion is an ideal technique to solve the above problem. RESULTS: A thermophilic granular sludge was successfully adapted for anaerobic digestion of MSW leachate (from an aging large-scale landfill) for methane production. The COD degradation efficiency improved by 81.8%, while the methane production rate reached 117.3 mL CH4/(g VS d), which was 2.34-fold more than the control condition. The bacterial and archaeal communities involved in the process were revealed by 16S rRNA gene high-throughput pyrosequencing. The richness of the bacterial community decreased in the process of thermophilic granular sludge, while the archaeal community structure presented a reverse phenomenon. The bacterial genus, Methanosaeta was the most abundant during the mesophilic process, while Methanobacterium, Methanoculleus, Methanosaeta and Methanosarcina were more evenly distributed. The more balanced community distribution between hydrogenotrophic and acetotrophic methanogens implied a closer interaction between the microbes, which further contributed to higher methane productivity. The detailed relationship between the key functional communities and anaerobic digestion performances were demonstrated via the multivariate canonical correspondence analysis. Conclusions: With the assistance of adaptive thermophilic granular sludge, microbial community structure was more evenly distributed, while both of COD degradation rate and methane production was improved during anaerobic digestion of MSW landfill leachate.
Descritores: Bactérias Anaeróbias/metabolismo
Resíduos Sólidos
Digestão Anaeróbia
Tratamento de Lodos
Metano/metabolismo
-Esgotos/microbiologia
Bactérias Anaeróbias/isolamento & purificação
Poluentes Químicos da Água
Reação em Cadeia da Polimerase
Área Urbana
Biocombustíveis
Análise da Demanda Biológica de Oxigênio
Temperatura Alta
Anaerobiose
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1052032
Autor: Reyes-Contreras, Carolina; Leiva, Ana María; Vidal, Gladys.
Título: Evaluation of triclosan toxic effects on the methanogenic activity
Fonte: Electron. j. biotechnol;39:61-66, may. 2019. graf, tab.
Idioma: en.
Projeto: CONICYT (Chile).
Resumo: BACKGROUND: Triclosan (TCS) is an antimicrobial agent widely used in health care and consumer products. This compound is present in sludge of wastewater treatment plants (WWTPs), and because of its bactericidal characteristics, it can inhibit the methanogenic activity in anaerobic digestion (AD) technology. The aim of this study was to evaluate the toxic effects of TCS on the methanogenic activity. RESULTS: Batch anaerobic reactors were used with TCS concentrations of 7.8, 15.7, 23.5, and 31.4 mg/L. These assays consisted in three successive feedings (I, II, and III), wherein the sludge was exposed to each TCS concentration and volatile fatty acid (VFA) substrate. For evaluation of the residual sludge activity during feeding III, only VFA was used. The results showed that the increase in TCS concentrations correlated with the reduction in methane (CH4) production. In this case, the minimum values were achieved for TCS concentration of 31.4 mg/L with CH4 levels between 101.9 and 245.3 during feedings I, II, and III. Regarding the effect of TCS on VFA consumption, an inhibitory effect was detected for TCS concentrations of 23.5 and 31.4 mg/L, with concentrations of acetic, butyric, and propionic acids at the end of the assay (37 d) between 153.6 and 206.8, 62.5 and 60.1, and 93.4 and 110 mg/L, respectively. Regarding the removal of TCS during AD, these values were above 47%. Conclusion: TCS is an inhibitor of methanogenic activity with a decrease between 63 and 70% during the different feedings. The CH4 production was not recovered during feeding III, with inhibition percentages of 21­72%.
Descritores: Triclosan/toxicidade
Digestão Anaeróbia
Metano/metabolismo
Anti-Infecciosos/toxicidade
-Esgotos
Estações de Tratamento de Águas Residuárias
Cromatografia Líquida de Alta Pressão
Ácidos Graxos Voláteis
Anaerobiose
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-843130
Autor: González-Sánchez, María E; Pérez-Fabiel, Sergio; Wong-Villarreal, Arnoldo; Bello-Mendoza, Ricardo; Yañez-Ocampo, Gustavo.
Título: Residuos agroindustriales con potencial para la producción de metano mediante la digestión anaerobia / Agroindustrial wastes methanization and bacterial composition in anaerobic digestion
Fonte: Rev. argent. microbiol;47(3):229-235, set. 2015. ilus, tab.
Idioma: es.
Resumo: Las toneladas de residuos orgánicos que se generan anualmente en la agroindustria pueden aprovecharse como materia prima para la producción de metano. Para que los residuos orgánicos se puedan convertir a metano a gran escala, es importante que previamente se realicen sobre ellos pruebas de biodegradabilidad; un parámetro importante que conviene establecer es su potencial bioquímico de metano. En el presente trabajo se estudió la biodegradabilidad, la producción de metano y el comportamiento de poblaciones de eubacterias y arqueobacterias durante la digestión anaerobia de residuos de plátano, mango y papaya provenientes de la agroindustria, adicionando un inóculo microbiano. Los residuos de mango y plátano tenían mayor contenido de materia orgánica (94 y 75 %, respectivamente) que el residuo de papaya con base en su relación sólidos volátiles/sólidos totales. Después de 63 días de tratamiento, la mayor producción de metano se observó en la digestión anaerobia del residuo de plátano: 63,89 ml de metano por g de demanda química de oxígeno del residuo. Los resultados del potencial bioquímico de metano demostraron que el residuo de plátano tiene el mejor potencial para ser usado como materia prima en la producción de metano. A través de un análisis por PCR-DGGE con oligonucleótidos específicos se logró evaluar el tamaño y la composición de las poblaciones de eubacterias y arqueobacterias presentes en la digestión anaerobia de residuos agroindustriales a lo largo del proceso.

The tons of organic waste that are annually generated by agro-industry, can be used as raw material for methane production. For this reason, it is important to previously perform biodegradability tests to organic wastes for their full scale methanization. This paper addresses biodegradability, methane production and the behavior of populations of eubacteria and archaeabacteria during anaerobic digestion of banana, mango and papaya agroindustrial wastes. Mango and banana wastes had higher organic matter content than papaya in terms of their volatile solids and total solid rate (94 and 75 % respectively). After 63 days of treatment, the highest methane production was observed in banana waste anaerobic digestion: 63.89 ml CH4/per gram of chemical oxygen demand of the waste. In the PCR-DGGE molecular analysis, different genomic footprints with oligonucleotides for eubacteria and archeobacteria were found. Biochemical methane potential results proved that banana wastes have the best potential to be used as raw material for methane production. The result of a PCR- DGGE analysis using specific oligonucleotides enabled to identify the behavior of populations of eubacteria and archaeabacteria present during the anaerobic digestion of agroindustrial wastes throughout the process.
Descritores: Digestão Anaeróbia/métodos
Gerenciamento de Resíduos/métodos
Metano/biossíntese
-Biodegradação Ambiental
Uso de Resíduos Sólidos
Agroindústria/prevenção & controle
Reciclagem/métodos
Análise da Demanda Biológica de Oxigênio/métodos
Resíduos de Alimentos
Tipo de Publ: Estudo Comparativo
Estudo de Avaliação
Estudo de Validação
Responsável: AR635.1 - FCVyS - Servicio de Información y Documentación


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Id: biblio-975992
Autor: Lifschitz, Carlos; Sieczkowska, Agnieszka.
Título: New insights into the fecal microbiota of children living in a slum: association with small bowel bacterial overgrowth / Novas ideias sobre a microbiota fecal de crianças que vivem em uma favela: associação com supercrescimento bacteriano do intestino delgado
Fonte: J. pediatr. (Rio J.);94(5):455-457, Sept.-Oct. 2018.
Idioma: en.
Descritores: Bactérias/crescimento & desenvolvimento
Fezes/microbiologia
Microbiota
Hidrogênio/análise
Intestino Delgado/microbiologia
Metano/análise
-Testes Respiratórios
Biomarcadores/análise
Áreas de Pobreza
Intestino Delgado/metabolismo
Limites: Humanos
Masculino
Feminino
Criança
Tipo de Publ: Editorial
Responsável: BR1.1 - BIREME


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Id: biblio-974307
Autor: Zhang, Nan; Peng, Huijuan; Li, Yong; Yang, Wenxiu; Zou, Yuneng; Duan, Huiguo.
Título: Ammonia determines transcriptional profile of microorganisms in anaerobic digestion
Fonte: Braz. j. microbiol;49(4):770-776, Oct.-Dec. 2018. tab, graf.
Idioma: en.
Projeto: Key Project of Education Department of Sichuan Province; . Major Cultivation Project of Education Department of Sichuan Province.
Resumo: ABSTRACT Anaerobic digestion is important for the management of livestock manure with high ammonia level. Although ammonia effects on anaerobic digestion have been comprehensively studied, the molecular mechanism underlying ammonia inhibition still remains elusive. In this study, based on metatranscriptomic analysis, the transcriptional profile of microbial community in anaerobic digestion under low (1500 mg L-1) and high NH4 + (5000 mg L-1) concentrations, respectively, were revealed. The results showed that high NH4 + concentrations significantly inhibited methane production but facilitated the accumulations of volatile fatty acids. The expression of methanogenic pathway was significantly inhibited by high NH4 + concentration but most of the other pathways were not significantly affected. Furthermore, the expressions of methanogenic genes which encode acetyl-CoA decarbonylase and methyl-coenzyme M reductase were significantly inhibited by high NH4 + concentration. The inhibition of the co-expressions of the genes which encode acetyl-CoA decarbonylase was observed. Some genes involved in the pathways of aminoacyl-tRNA biosynthesis and ribosome were highly expressed under high NH4 + concentration. Consequently, the ammonia inhibition on anaerobic digestion mainly focused on methanogenic process by suppressing the expressions of genes which encode acetyl-CoA decarbonylase and methyl-coenzyme M reductase. This study improved the accuracy and depth of understanding ammonia inhibition on anaerobic digestion.
Descritores: Bactérias/genética
Bactérias/metabolismo
Amônia/metabolismo
-Bactérias/isolamento & purificação
Bactérias/classificação
Transcrição Genética
Reatores Biológicos/microbiologia
Ácidos Graxos Voláteis/metabolismo
Microbiota
Anaerobiose
Metano/metabolismo
Responsável: BR1.1 - BIREME


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Id: lil-788957
Autor: Barros, Valciney Gomes de; Duda, Rose Maria; Oliveira, Roberto Alves de.
Título: Biomethane production from vinasse in upflow anaerobic sludge blanket reactors inoculated with granular sludge
Fonte: Braz. j. microbiol;47(3):628-639, July-Sept. 2016. tab, graf.
Idioma: en.
Projeto: CAPES; . CNPq.
Resumo: ABSTRACT The main objective of this study was to evaluate the anaerobic conversion of vinasse into biomethane with gradual increase in organic loading rate (OLR) in two upflow anaerobic sludge blanket (UASB) reactors, R1 and R2, with volumes of 40.5 and 21.5 L in the mesophilic temperature range. The UASB reactors were operated for 230 days with a hydraulic detection time (HDT) of 2.8 d (R1) and 2.8-1.8 d (R2). The OLR values applied in the reactors were 0.2-7.5 g totalCOD (L d)−1 in R1 and 0.2-11.5 g totalCOD (L d)−1 in R2. The average total chemical oxygen demand (totalCOD) removal efficiencies ranged from 49% to 82% and the average conversion efficiencies of the removed totalCOD into methane were 48-58% in R1 and 39-65% in R2. The effluent recirculation was used for an OLR above 6 g totalCOD (L d)−1 in R1 and 8 gtotalCOD (L d)−1 in R2 and was able to maintain the pH of the influent in R1 and R2 in the range from 6.5 to 6.8. However, this caused a decrease for 53-39% in the conversion efficiency of the removed totalCOD into methane in R2 because of the increase in the recalcitrant COD in the influent. The largest methane yield values were 0.181 and 0.185 (L) CH4 (gtotal COD removed)−1 in R1 and R2, respectively. These values were attained after 140 days of operation with an OLR of 5.0-7.5 g totalCOD (L d)−1 and total COD removal efficiencies around 70 and 80%.
Descritores: Esgotos/microbiologia
Fermentação
Metano/biossíntese
-Fósforo/metabolismo
Reatores Biológicos
Compostos Orgânicos Voláteis
Análise da Demanda Biológica de Oxigênio
Concentração de Íons de Hidrogênio
Anaerobiose
Nitrogênio/metabolismo
Responsável: BR1.1 - BIREME


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Id: biblio-1017382
Autor: Mamimin, Chonticha; Prasertsan, Poonsuk; Kongjan, Prawit; O-Thong, Sompong.
Título: Effects of volatile fatty acids in biohydrogen effluent on biohythane production from palm oil mill effluent under thermophilic condition
Fonte: Electron. j. biotechnol;29:78-85, sept. 2017. tab, graf, ilus.
Idioma: en.
Projeto: Khon Kaen University; . Thailand Research Fund.
Resumo: Background: Biohydrogen effluent contains a high concentration of volatile fatty acid (VFA) mainly as butyric, acetic, lactic and propionic acids. The presence of various VFAs (mixture VFAs) and their cooperative effects on two-stage biohythane production need to be further studied. The effect of VFA concentrations in biohydrogen effluent of palm oil mill effluent (POME) on methane yield in methane stage of biohythane production was investigated. Results: The methane yield obtained in low VFA loading (0.9 and 1.8 g/L) was 15­20% times greater than that of high VFA loading (3.6 and 4.7 g/L). Butyric acid at high concentrations (8 g/L) has the individual significantly negative effect the methane production process (P b 0.05). Lactic, acetic and butyric acid mixed with propionic acid at a concentration higher than 0.5 g/L has an interaction significantly negative effect on the methanogenesis process (P b 0.05). Inhibition condition had a negative effect on both bacteria and archaea with inhibited on Geobacillus sp., Thermoanaerobacterium thermosaccharolyticum, Methanoculleus thermophilus and Methanothermobacter delfuvii resulting in low methane yield. Conclusion: Preventing the high concentration of butyric acid, and propionic acid in the hydrogenic effluent could enhance methane production in two-stage anaerobic digestion for biohythane production.
Descritores: Propionatos/metabolismo
Butiratos/metabolismo
Águas Residuárias/microbiologia
Metano/biossíntese
-Propionatos/análise
Butiratos/análise
Óleo de Palmeira
Methanobacteriaceae
Archaea
Methanomicrobiaceae
Geobacillus
Fermentação
Águas Residuárias/análise
Hidrogênio
Anaerobiose
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1009757
Autor: Matsakas, Leonidas; Gao, Qiuju; Jansson, Stina; Rova, Ulrika; Christakopoulos, Paul.
Título: Green conversion of municipal solid wastes into fuels and chemicals
Fonte: Electron. j. biotechnol;26:69-83, Mar. 2017. ilus, graf, tab.
Idioma: en.
Resumo: Presently, the society is facing a serious challenge for the effective management of the increasing amount of produced municipal solid wastes. The accumulated waste has caused a series of environmental problems such as uncontrolled release of greenhouse gases. Moreover, the increasing amount of wastes has resulted in a shortage of areas available for waste disposal, resulting in a nonsustainable waste management. These problems led to serious public concerns, which in turn resulted in political actions aiming to reduce the amount of wastes reaching the environment. These actions aim to promote sustainable waste management solutions. The main objective of these policies is to promote the recycling of municipal solid waste and the conversion of waste to energy and valuable chemicals. These conversions can be performed using either biological (e.g., anaerobic digestion) or thermochemical processes (e.g., pyrolysis). Research efforts during the last years have been fruitful, and many publications demonstrated the effective conversation of municipal solid waste to energy and chemicals. These processes are discussed in the current review article together with the change of the waste policy that was implemented in the EU during the last years.
Descritores: Resíduos Sólidos
Gerenciamento de Resíduos/métodos
Fontes Geradoras de Energia
-Digestão Anaeróbia
Pirólise
Eliminação de Resíduos
Cidades
Etanol
Meio Ambiente
Biocombustíveis
Hidrogênio
Metano
Tipo de Publ: Revisão
Responsável: CL1.1 - Biblioteca Central



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