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Irini Angelidaki, Kanokwan Boe and Lars Ellegaard
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Presentation content Biogas in Denmark: A typical Centralized Biogas Plant Main Results of the investigation Conclusions
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Location of Centralized biogas plants in Denmark
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Typical centralized biogas plant Ribe biogas plant
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Full-scale investigation Process stability Process efficiency Microbiology
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Potential methods to improve recovery efficiency from manure -Increase stabilily of the digestion process -Pre-treatment of incoming substrate (to increase degradability) -Increase retention time of the manure reactor(s) -Arrange post-digestion systems (to increase degradation efficiency)
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Stability in Danish Biogas Plants
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Correlation between ammonia and VFA.
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Residual methane production 55 o C 25 o C 20 o C 15 o C 55 o C 25 o C 20 o C 15 o C
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Residual methane production
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Restgastab i forhold til total produktion >15%10-15%< 10%
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Temperature and residual methane
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Distribution of the total methane potential
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Main reactor residual methane loss versus retention time
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Temperature effect on residual biogas potential
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INCREASING TEMPERATURE Samples previously incubated at 10 -15 C for a long period have been moved to process temperature (37 -54 C):
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INNOVATIVE SOLUTIONS SITUATION: The majority of the biogas plants have Reactors with good efficiency; Many plants are loosing a lot and the gap between the theoretical and the practical potential is still wide; MAIN OBSTACLE: hydrolysis is the real rate limiting step for the further methanogenesis increase HRT to provide a better substrate hydrolysis SOLUTIONS: TRADITIONAL SOLUTIONS INNOVATIVE SOLUTIONS New process configurataion: Utilization of the After-Storage. Increase the HRT in main reactor
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Conclusions Significant amounts of CH4 are lost (5-30%) Plants with HRT< 15 days are lossing more CH4 from the main reactor Post-digestion is highly influenced by the temperature Post-digestion at low temperature are increasing the total methane potential of the material Manure-plants are dominated by Methanosarcina, while sludge plants by Methanosaeta.
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Acknowledgements The study was funded by the Danish Energy Agency,“Development of Renewable Energy” The operational staff of the Biogas Plants participating in the investigation is greatly acknowledged Researchers: Kanokwan Boe Lars Ellegaard Dimitar Karakshlev Damien Batstone Irini Angelidaki Students: Simone Labo Lucía Fernández García Eva Arler He Zhen Chao Pan Troels Hilstrøm Søren H. Laursen Technicians: Hector Garcia Majbrit Staun Jensen
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