Cold climate Biogas for rural households
Categories: Energy, Waste Management & Recycling
Organization: ADRA Austria
Website: http://www.adra.at/en/english.html
Contact: Marcel Wagner
Email: m.wagner@adra.at
Used by: North Korea
Solution:
Biogas production bacteria need >15°C to produce methane. This limits biogas use in colder climates. However in winter, people need energy most. A cheap heating/insulation source is needed. The innovation: Around a standard fermenter design a compartment is built and filled with compost (mixed straw and manure). The compartment outer wall is insulated with rice-shell ash or equivalent material. Good compost reaches a temperature of up to 60°C and heats the fermenter for 3-4 months. With permanent sub-zero temperatures of more than 2 weeks, the biogas plant is to be covered by a greenhouse. Cold-climate agriculture needs greenhouses to cultivate seedling to prepare for the planting season. The greenhouse is added-value and the fermented manure (alkaline fertilizer) can be used to fertilize greenhouse soil. To improve the efficiency of fermentation, the greenhouse back wall is built with heat storing material and painted black to heat up at day time and radiate at night time. The front side is covered by rice straw mats during night time.
Biogas production bacteria need >15°C to produce methane. This limits biogas use in colder climates. However in winter, people need energy most. A cheap heating/insulation source is needed. The innovation: Around a standard fermenter design a compartment is built and filled with compost (mixed straw and manure). The compartment outer wall is insulated with rice-shell ash or equivalent material. Good compost reaches a temperature of up to 60°C and heats the fermenter for 3-4 months. With permanent sub-zero temperatures of more than 2 weeks, the biogas plant is to be covered by a greenhouse. Cold-climate agriculture needs greenhouses to cultivate seedling to prepare for the planting season. The greenhouse is added-value and the fermented manure (alkaline fertilizer) can be used to fertilize greenhouse soil. To improve the efficiency of fermentation, the greenhouse back wall is built with heat storing material and painted black to heat up at day time and radiate at night time. The front side is covered by rice straw mats during night time.
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