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CH4 recovery experiments were conducted using polysulfone hollow fiber gas separation membranes. In the experiment conducted using synthetic gas (60 mol % CH4 and 40 mol % CO2) in a single module at pressures of 0.5 and 0.7 MPa, the concentration of CH4 in the produced gas was over 98%. However, the CH4 recovery rate was low at under 40%. In comparison, under two stage recirculation, CH4 recovery rates improved to 76.8% (0.5 MPa) and 79.1% (0.7 MPa) at a membrane area ratio of 1:1 (stage 1 versus stage 2). Recovery rates further improved to 85.0% (0.5 MPa) and 86.1% (0.7 MPa) at a membrane area ratio of 1:2. In the experiment using food waste water digestion gas, in which the concentration of CH4 in the produced gas was maintained at over 98%, membrane area ratios of 1:1:0:1 and 2:1:0:1 among three branching form and a four stage branching form produced relatively high recovery rates. Meanwhile, the most desirable gas production per unit membrane area was achieved at a three stage series connection compare to the case of four and three stage branching form.

Methane Recovery from Food Waste Digestion Gas by Multi Stage Hollow Fiber Membrane