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| Registros recuperados: 59 | |
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| Rauh, Stefan; Berenz, Stefan; Heissenhuber, Alois. |
| Die Novellierung des Gesetzes für den Vorrang Erneuerbarer Energien (EEG) führte zu einem verstärkten Einstieg von Landwirten in die Biogasproduktion. Jedoch können die mit dem EEG verbundenen relativ hohen Vergütungssätze das vorhandene Investitionsrisiko in einer Biogasanlage nicht eliminieren. Es existiert eine gewisse Zahl an Einflussfaktoren, welche die Wirtschaftlichkeit nachhaltig beeinflussen. Eine Risikoanalyse mittels der Monte-Carlo- Methode zeigt den enormen Einfluss der Risikofaktoren auf die Varianz des Gewinns. Es wird dadurch deutlich, dass eine statische Planungsrechnung, welche Unsicherheit nicht berücksichtigt, oftmals zu einer Fehleinschätzung führen kann. Gleichzeitig gelingt es mit Hilfe einer Monte-Carlo-Simulation die größten... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Monte-Carlo-Simulation; Risikoanalyse; Wirtschaftlichkeit; Biogas. |
| Ano: 2007 |
URL: http://purl.umn.edu/7588 |
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| Santos,Tânia M. B. dos; Trevizan,Paula S. F.; Xavier,Cristiane A. N.; Kiefer,Charles; Ferraz,André L. J.. |
| ABSTRACT This study aimed to evaluate the efficiency of anaerobic digestion and biogas production by manure from pig supplemented with ractopamine over different periods. We used manure of 50 finishing pigs according to the following diets: without supplementation and supplemented with 20-ppm ractopamine during 7, 14, 21, 28 and 35 days pre-slaughter. Continuous bench biodigesters were used in the experiment. We measured biogas production and made analyses of total (TS) and volatile solids (VS), pH, total phosphorus (total P), total nitrogen (total N) and ammoniacal nitrogen (ammoniacal N) in samples of manure, affluent and effluent from biodigesters. The pH and ammoniacal N as indicator parameters of the process balance and stability were satisfactory.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Β-adrenergic; Biogas; Ractopamine hydrochloride; Environmental impact and nutrient partitioning. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000300399 |
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| Miranda,Adélia P.; Lucas Junior,Jorge de; Thomaz,Maria C.; Pereira,Gener T.; Fukayama,Ellen H.. |
| The objective of this study was to evaluate the quality and the production of biogas and biofertilizer obtained from biodigester supplied with pig feces in the initial, growing and finishing stages, fed with diets formulated based on corn or sorghum. Twenty bench biodigesters were used with hydraulic retention time of 30 days and daily loads that contained 4 to 6% of total solids (TS) and 3.6 to 5.2% of volatile solids (VS). In the effluent of the biodigesters, mean levels of TS were observed ranging between 1.6 and 2.0% and of VS between 1.2 and 1.6%. The mean reductions of TS were 57.7 to 64.7% and of VS from 61.7 to 69.0%, and there was only difference in the finishing phase, in which the major averages reductions were produced by the biodigesters... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodigesters; Biogas; Pig feces; Environmental impact. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100006 |
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| Larsen,Andrea C.; Gomes,Benedito M.; Gomes,Simone D.; Zenatti,Dilcemara C.; Torres,Douglas G. B.. |
| The Brazil's Biodiesel Production and Use Program introduces biodiesel in the Brazilian energy matrix, bringing along the perspective of a growth of the glycerin offer, co-product generated in the proportion of 10 kg for each 100 L of biodiesel. The aim of this study was to evaluate the addition of crude glycerin in the anaerobic digestion of cassava starch industry effluent (cassava wastewater), in a horizontal semi-continuous flow reactor of one phase in laboratory scale. It was used a reactor with a 8.77 L of useful volume, a medium support for corrugated conduit of polyvinyl chloride (PVC), temperature of 261 ºC, fed with cassava wastewater and glycerin, with hydraulic detention times of 4 and 5 days and increasing volumetric organic load of 3.05;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cassava wastewater; Biodiesel; Biogas; Glycerol. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000200013 |
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| Matter,Juliana M.; Costa,Mônica S. S. de M.; Costa,Luiz A. de M.; Pereira,Dercio C.; Varennes,Amarílis de; Tessaro,Dinéia. |
| ABSTRACT Aiming to evaluate different wastewaters in the anaerobic co-digestion (ACoD) of hatchery wastes, a batch test was conducted in bench horizontal digesters. At the end of the process, the potential production of biogas and methane was calculated as well as the chemical composition (macro- and micronutrients) of the effluent and the concentrations of methane and carbon dioxide gas at 60 days. The monitoring of the process included observations of the reduction of the organic carbon, chemical oxygen demand, and total (TS) and volatile solids (VS), as well as the variation of pH and electrical conductivity (EC). The results showed that the mixing between the hatchery fresh waste and swine wastewater (T4) and among fresh hatchery waste, water from the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biogas; Methane; Swine wastewater; Slaughterhouse wastewater. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000900651 |
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| Vicente Jr.,Donizete J.; Costa,Monica S. S. de M.; Costa,Luiz A. M.; Pereira,Dercio C.; Santos,Francielly T. dos. |
| ABSTRACT Considering the constant increase in the waste generation from poultry and pigs’ husbandries, the main contributions of this study were to verify the potential of biogas production through the anaerobic digestion and co-digestion of the residues generated by these two activities, as well as to highlight the recovery of the nutrients contained in the obtained digestate. The wastes used were poultry litters after six, seven and eight production lots, as well as the sifted wastewater from one Piglets Producer Unit (PPU). Higher biogas production (p <0.05) was observed in the treatments in which anaerobic codigestion was used with the swine wastewater (SW): 0.179; 0.158 and 0.117 m3 per kg of total solids (TS) added for poultry litters with six,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agroindustry; Digestate; Biogas; Waste treatments. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000600961 |
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| Sandim,Álvaro A.; Batista,Alexandre G.; Bareta,Maria Luiza E.; Betini,Roberto C.; Pepplow,Luiz Amilton. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biogas; Biomass; Rural areas; Electricity. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000200201 |
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| Kuczman,Osvaldo; Tavares,Maria H. F.; Gomes,Simone D.; Guedes,Luciana P. C.; Grisotti,Geovane. |
| The cassava starch industries generate a large volume of wastewater effluent that, stabilized in ponds, wastes its biogas energy and pollutes the atmosphere. To contribute with the reversion of this reality, this manipueira treatment research was developed in one phase anaerobic horizontal pilot reactor with support medium in bamboo pieces. The reactor was excavated into the ground and sealed with geomembrane in HDPE, having a volume equal to 33.6 m³ and continuous feeding by gravity. The stability indicators were pH, volatile acidity/total alkalinity ratio and biogas production. The statistical analyses were performed by a completely randomized design, with answers submitted to multivariate analysis. The organical loads in COD were 0.556; 0.670; 0.678 and... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Biodigester; Biogas; Anaerobic digestion; Cassava; Cassava wastewater. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600021 |
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| Oliva-Merencio,Deny; Pereda-Reyes,Ileana; Schimpf,Ulrike; Koehler,Stefan; Silva,Ariovaldo J. da. |
| ABSTRACT This paper studied the effect of adding an enzyme (ellulose) on anaerobic digestion of maize silage. We compared materials at chopping lengths of 8 mm (MSL), 4mm (MSS) and natural size (Ms) under a mesophilic and discontinuous operation (batch process). Hence, we found the process to be significantly influenced by particle size. Moreover, the ellulose addition did not significantly impact biogas production after a 35-day digestion period. Ms and MSS displayed an improved response to all variables when compared with MSL and MSL+C, with significant differences. Studies on the refractory fraction at infinite time (R0) have demonstrated that the lowest values correspond to Ms and MSS (0.122 and 0.155, respectively). The Kinetic approach and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ellulose; Silage; Biogas; Kinetics; Biodegradability. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000500951 |
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| Orrico Junior,Marco Antonio Previdelli; Schwingel,Alice Watte; Centurion,Stanley Ribeiro; Orrico,Ana Carolina Amorim. |
| ABSTRACT The objective of this research was to evaluate the performance of anaerobic co-digestion of swine excreta associated with increasing doses of crude glycerin and different hydraulic retention times (HRT). A completely randomized design was adopted in a 3 × 4 factorial arrangement composed of three HRT (10, 17, and 24 days) and four crude glycerin doses (0, 5, 10, and 15 g/100 g of total solids [TS]), with four replications per treatment. The assessed parameters were: biogas production potential, reductions of volatile solids (VS), chemical oxygen demand (COD), and most probable number of total and thermotolerant coliforms. The biogas production per added VS presented quadratic effect at 17 and 24 days of HRT, with ideal doses of 5.5 and 5.9 g of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodiesel; Biogas; Manure; Waste. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000300101 |
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| Simm,Silvana; Orrico,Ana Carolina Amorim; Orrico Junior,Marco Antonio Previdelli; Sunada,Natália da Silva; Schwingel,Alice Watte; Mendonça Costa,Mônica Sarolli Silva de. |
| ABSTRACT Anaerobic digestion of crude glycerin (CG) along with animal waste has been an excellent option for increasing the production of biogas and methane to achieve efficiency in the treatment of both residues. This study aimed to evaluate improvements in specific productions of biogas and methane, reductions in solid and fibrous components in substrates prepared with dairy cattle manure and CG (containing 14 % glycerol). With these residues, experimental substrates were prepared and placed in 25 batch digesters. Initial content of the TS in the influent was 4 % and CG was added in increasing doses (0, 5, 10, 15 and 20 % relative to total solids (TS) of the influent). Results were submitted to ANOVA and orthogonal contrasts to assess the effects of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycerol; Biogas; Anaerobic digestion; Solids. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300175 |
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| Hirano,Marcio Y.; Silva,Celso L. da. |
| ABSTRACT The increase in confined cattle breeding reflects the modernization and automation of farming, which has significantly intensified in recent years and caused an increase in the energy demand of rural properties. This study investigated the use of biogas generated from dairy cattle manure confined in gas microturbines on a farm to generate electricity and the energy use of exhaust gases. At the end of the study, 6,195 to 16,077 kWh month-1 of electricity was obtained, which corresponds to 43.3% of the property's self-sufficiency energy demand. By performing an exhaust gas energy exploitation, between 6.8 and 13.6 m3 day-1 of water heated to 368 K can be produced, or between 11,880 and 23,661 kWh month-1 of cooling capacity can be obtained using a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy exploitation; Biogas; Dairy cattle; Microturbine. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000400526 |
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| Registros recuperados: 59 | |
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