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Biodigester output

Trying to design a system(NY) that is seamless, with kitchen sink connected to my biodigester. Is it possible to connect a small intermediate biodigester bladder to my house gas line with a shutoff valve, a check valve.
House gas pipe + shut off valve + check valve + 1/2" hose barb connected to rubber bladder.
House gas is prevented from entering bladder via a check valve. Pressure on check valve is controlled via the shutoff valve. When cooking, gas flows into house gas line supplementing need. No need to store a large amount of gas.