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Biogas aus Festmist – eine neue Technologie zu Schließung des Nährstoff- und Energiekreislaufes auf dem landwirtschaftlichen Betrieb

Schäfer, Winfried; Evers, Lars; Lehto, Marja; Sorvala, Sanna; Teye, Frederick and Granstedt, Artur (2005) Biogas aus Festmist – eine neue Technologie zu Schließung des Nährstoff- und Energiekreislaufes auf dem landwirtschaftlichen Betrieb. [Biogas from manure – a new technology to close the nutrient and energy circuit on-farm.] In: Heß, J.C. and Rahmann, G. (Eds.) Ende der Nische, Beiträge zur 8. Wissenschaftstagung Ökologischer Landbau, Kassel University Press GmbH, Kassel.

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Summary

The Biodynamic Research Institute in Järna developed at the farm Yttereneby a two phase biogas plant. The plant digests manure of dairy cattle and organic residues originating from the farm and the surrounding food processing units containing 17,7 - 19,6 % dry matter. A new technology for continuously filling and discharging the biogas reactor was developed and implemented. Digestion residues are separated into a solid fraction for composting and into a liquid fraction. The solid fraction is suitable for aerobic composting. Initial results show that anaerobic digestion and following aerobic composting of the solid fraction improves the nitrogen balance of the farm compared to mere aerobic composting. Composted biogas plant residues and effluent together contain 70,8 % of input Ntot and 93,3 % of input NH4, merely aerobic digested manure 51,3 % Ntot and 3,9 % NH4 only. Additionally anaerobic digestion improves the energy balance of the farm producing up to 269 l biogas kg-1 VS or 1,7 kWh heat kg-1 VS.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Naturschutz und Umweltverträglichkeit, Nährstoffmanagement, Landtechnik, Biogas
Subjects:"Organics" in general
Animal husbandry > Production systems > Dairy cattle
Food systems > Recycling, balancing and resource management
Crop husbandry > Composting and manuring
Research affiliation: International Conferences > 2005: Scientific Conference on Organic Agriculture
Finland > MTT Agrifood Research
Deposited By: Schäfer, Dr. Winfried Christian
ID Code:3459
Deposited On:05 Mar 2005
Last Modified:12 Apr 2010 07:29
Document Language:German - Deutsch
Status:Published
Refereed:Peer-reviewed and accepted

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