STI’s research team is currently working on a system to compress and store biogas that is created in our anaerobic digester.  Others who have used anaerobic digestion fertilizer for hydroponic systems have found that storing the abundance of created methane is a difficult obstacle to overcome.  When processing waste in the digester to create the needed tea fertilizer for the hydroponic vegetables, the process byproduct is methane gas.  This is a good thing, as the gas can be used for fuel to offset energy costs in a hydroponic business.  However, storing the methane as it accumulates can be difficult, being that the uncompressed gas is generally stored in large polyethylene bags that take up a lot of space and come with a hefty price tag.  STI is currently installing a 10 cubic yard gas bag, as our 400 gallon drum storage cylinder is filling more quickly than we had anticipated.  Because the warmer months are approaching, burning the gas as it accumulates in our biogas heaters will not become necessary and we are engineering a system where the gas can be collected in our non-pressurized drum barrel and large gas bag and then compressed and stored in large propane style tanks.  The large and customized biogas pump that we just purchased will transfer the gas into the propane tank.  Then a 1 hp water pump will fill the tank with water at a high pressure and a pressure relief valve will allow the compressed gas to transfer into another tank for permanent storage.  After we automate this process, we will then begin to engineer a CO2 scrubbing system and separate the CO2 from the methane, with the intention of injecting the CO2 into the aeration system in the hydroponic pond.  It is possible that our research team will be the first to explore the synergy of biogas CO2 extraction for purification of stored methane with the simultaneous acceleration of plant growth from the injection of the extracted CO2 into the hydroponic pond.  Pictures will be posted soon as we start the construction of this project!