I've read that a family of 4 produce enough methane waste in their septic system to yield about 40% of their home energy needs and would like to build a home system for this purpose. Does anyone have any good research/sources on designs for methane/biogas-harvesting septic systems? I'm assuming it's not as simple as using an air-tight tank and pumping off the gas from a storage bladder attached to it after drying - that the geometry of the tank and the layout of various digesters/tanks would play a big role in actually reaching that 40%-of-total-energy-use quota worth of methane production and harvest. Are there specific nutrients that should be monitored and potentially supplemented to maintain the optimal biogas generation rate for a given volume of mass? Dwell times in gas-harvesting chamber(s) prior to moving on to subsequent stages in the septic system (such as waste storage for removal?) Does it need a giant poop blender inside to keep it liquefied and churning around, or is a continuous-flow design possible to achieve the same efficiencies? Any help answering these questions would be appreciated, and I'll post photos+data when I actually build the thing.
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