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| Postec, Anne; Urios, Laurent; Lesongeur, Francoise; Ollivier, Bernard; Querellou, Joel; Godfroy, Anne. |
| The microflora developing during a continuous enrichment culture from a hydrothermal chimney sample was investigated by molecular methods. The culture was performed in a gas-lift bioreactor under anaerobic conditions, at 90 degrees C and pH 6.5, on a complex medium containing sulfur as the terminal electron acceptor. Archaeal and bacterial diversity was studied. Microorganisms affiliated with the genera Pyrococcus, Marinitoga, and Bacillus were detected through DGGE analysis of 16S rDNA. Additional sequences phylogenetically related to Thermococus and epsilon-Proteobacteria were detected by cloning and sequencing of 16S rDNA from two samples of the enrichment culture. In comparison, the sequences retrieved from cloning analysis from an enrichment culture... |
| Tipo: Text |
Palavras-chave: Sequence alignment; Anaerobic digester; Thermotogales; Thermophile; Deep sea vent. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-364.pdf |
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| Casas Prieto, Miguel Angel; Rivas Lucero, Bertha Alicia; Soto Zapata, Manuel; Segovia Lerma, Armando; Morales Morales, Hugo Armando; Cuevas Gonzalez, Martha Isela; Kiessling Davison, Christian Mauricio. |
| The energetic value as end product is among several benefits from effective waste management programs at intensive feedlots. It is increasing around the world since organic waste is a source of environmental pollution. The biogas can be obtained from simple to complex scale anaerobic digesters. Currently, there is in Mexico official instruments supporting clean technologies to promote the sustainable developing at regional levels. Based on Kyoto Protocol principles, Mexico has been promoting the emissions bonus to reduce the greenhouse gases such as methane from intensive feedlots. It is understood, that feedlots are a rich source of potential green energy. There are 58 000 milking cows in active production at Delicias, Chihuahua region, it is a potential... |
| Tipo: Journal Article |
Palavras-chave: Anaerobic digester; Biogás; Carbon credits; Feasibility; Environmental quality.; Agribusiness. |
| Ano: 2009 |
URL: http://purl.umn.edu/48604 |
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| Leuer, Elizabeth R.; Hyde, Jeffrey; Richard, Tom L.. |
| A stochastic capital budget was used to analyze the effect of net metering policies and carbon credits on profitability of anaerobic digesters on dairy farms in Pennsylvania. We analyzed three different farm sizes—500, 1,000, and 2,000 cows—and considered the addition of a solids separator to the project. Results indicate that net metering policies and carbon credits increase the expected net present value (NPV) of digesters. Moreover, the addition of a solids separator further increases the mean NPV of the venture. In general, the technology is profitable only for very large farms (1,000+ cows) that use the separated solids as bedding material. |
| Tipo: Journal Article |
Palavras-chave: Anaerobic digester; Stochastic capital budget model; Dairy farm; Alternative energy; Environmental Economics and Policy; Livestock Production/Industries. |
| Ano: 2008 |
URL: http://purl.umn.edu/45662 |
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| Rivas Lucero, Bertha Alicia; Zuniga Avila, Gabriel; Saenz Solis, Jorge Iram; Guerrero Morales, Sergio; Segovia Lerma, Armando; Morales Morales, Hugo Armando. |
| Currently almost all energy is provided by fossil fuels that increase greenhouse gas emissions contributing to global warming. These emissions can be reduced with the use of renewable energy produced from biomass such a livestock manure. The manure is raw material for production of electricity and thermal energy. Anaerobic digestion of waste can reduce emissions by capturing methane, a greenhouse gas produced by waste in facilities large and small scale. The South Central region of the state of Chihuahua has the potential for renewable energy production from biomass and waste are approximately 58,000 head of cattle, valuing a daily output of 2,900 m3 of sewage and 10,000 m3 of waste water can cause environmental problems. The estimated biogas production... |
| Tipo: Article |
Palavras-chave: Anaerobic digester; Biogas; Biomass; Renewable energy.; Agribusiness. |
| Ano: 2012 |
URL: http://purl.umn.edu/120496 |
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