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Energy and emergy evaluation of potentials for energy self-sufficiency in Danish organic dairy farms by production of biogas and bioethanol

Markussen, Mads Ville; Østergård, Hanne; Oleskowicz-Popiel, Piotr; Schmidt, Jens Ejby and Pugesgaard, Siri (2009) Energy and emergy evaluation of potentials for energy self-sufficiency in Danish organic dairy farms by production of biogas and bioethanol. In: Fredriksson, Pelle and Ullvén, Karin (Eds.) Proceedings from 1st Nordic Organic Conference. Towards increased sustainability in the food supply chain. 18-20 May 2009. Gothenburg, Sweden, Centrum för uthålligt lantbruk (CUL), SLU, p. 168.

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Online at: http://nordicorganic.org/NOC-report-web.pdf

Summary

One obvious way to enhance agricultural resilience is for farms to increase self-sufficiency with necessities such as fuel, fodder and fertilizer. Our research seeks to uncover these potentials for Danish organic dairy farming.
The setting is a theoretical model of a farm-cooperation of 10 farms of 100 ha each producing only milk and animals for slaughtering and being self-sufficient with fodder and fertilizer. The question is if they can be self-sufficient with energy by means of shared biogas and/ or bioethanol production facilities. The method is mapping of energy, emergy (embodied energy measured in solar energy joules) and mass flows in different scenarios, that are based on empirical data from Danish dairy farms concerning mix of crops, crop yields, livestock input/output and fuel and electricity consumption.
In various scenarios different utilization of the produced crop is tested. Biogas is produced from manure and either clover grass or maize, and the effluent is fed back to the fields as fertilizer. In another scenario bioethanol is produced from grain and whey originating from the dairy cheese production, and the effluent is fed back to the livestock as a protein-rich fodder.
Results compare the different scenarios in terms of mass, energy and emergy flows, thus including direct and indirect energy. Overall resource and energy efficiency are evaluated.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Keywords:Energy, emergy, energy self-sufficiency, dairy, biogas, bioethanol, system analysis
Subjects: Farming Systems
Food systems > Recycling, balancing and resource management
Values, standards and certification > Technology assessment
Research affiliation: Denmark > DARCOF III (2005-2010) > BIOCONCENS - Biomass and bio-energy production in organic agriculture
Denmark > AU - Aarhus University > AU, DJF - Faculty of Agricultural Sciences
Denmark > DTU, RISØ - Risø National Laboratory
Deposited By: Markussen, Mads Ville
ID Code:15842
Deposited On:24 Jun 2009
Last Modified:12 Apr 2010 07:39
Document Language:English
Status:Published
Refereed:Not peer-reviewed

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