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That's a good idea in general I think, but it probably won't help when the ground is frozen. In that state it would probably be even better to have it standing above ground :DIf I am really bored I might try both to get some measure of comparison.
Ah, but compost heaps have aerobic digestion! that produces more heat than anaerobic, as far as I know.But speculation aside, I will try the insulation and if all else fails I have to use some burned biogas to heat a water hose running around the digester.
Really? I thought anerobic digestion does not generate much heat...?
Ah, but compost heaps aerobic digestion! that produces more heat than anaerobic, as far as I know.But speculation aside, I will try the insulation and if all else fails I have to use some burned biogas to heat a water hose running around the digester.
Thank you for this great instructable (and the other 2 you did on biogas production). I am planning to implement a similar construction here in Germany, but am a bit worried about our resident temperatures. I did some research and found that the bacteria (especially those for methanogenesis) prefer temperatures between 20°C and 50°C to thrive and don't like large temperature differences (for example day-night-cycle). Those values are for industrial sized biogas production -- where a constant gas output is needed -- so I don't know how much they apply to smaller scale garden systems.Can you tell me a bit about your experience with temperature variation? I am not familiar with your local climate, but I guess it's a lot warmer than mine. What was the coldest temperature your biogas plant still worked with? Did it ever stop working due to cold temperatures? What is the highest day-night-difference in temperature you get?I plan on starting in the summer -- where the heat is at it's maximum -- but even then nights can get pretty cold and in spring and autumn there is usually some freezing.Do you have any information about this problem?Kindest Regards,Hexacyanoferrat
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