I am building a small scale digester to test whether it is possible to store the methane produced in a pressurised cannister. I need to find a method that will allow me to fill the pressurised cannister from a low pressure source.
If you are attempting to figure out pressurization from a composting drum/ digester, I recommend talking to Dr. Nicholas Smith-Sebasto who is an expert in composting and has been working on his own digesting drum which is now patented. He may know.
The increase the pressure, the equipment you need is a gas compressor that requires some filters before to avoid the inlet of solids with the flow. This equipment has to have explosion proof electric motor and I recomend you to contract an speciallyzed company to do this. Normally small biodigesters operates connected to special bags of low pressure. If the pressure you will store is very high, some crystals can appear and block valves and the gas has to be treated and dried before compression. In this case only big systems have a techno economic feasability.
You need to purify biogas into high purity methane by removing water vapour, CO2, H2S/NH3 and other impurities and then you can use gas compressor. You should calculate the energy balance of your effort to produce compression biogas. Particularly for small scale, biogas doesn't have positive economic feasibility because methane (main fuel gas of biogas) can not liquified into pressurized canister/tank on ambient condition. I suggest to utilize biogas directly for heat or convert it into electricity and save on battery/accumulator as energy storage so it can distribute to another location.
Thank you for the input.
I've had to put this project to the side for a bit, but we're back at it.
Our main purpose is to build a small system that will recycle ♻️ our home waste and reduce our carbon footprint.
For removal of C02, water vapour, and S2H I was looking at three scrubbing systems, first lime water, second ironoxide, and lastly sawdust.
I didn't see any info on NH3 in the gas, a recommended scrubber would be appreciated.
Looks like my options for using the energy is a Gass lamp system outside, or using a small steam engine that can generate power to be stored in batteries.
Again any suggestions would be appreciated.
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