| 초록 |
Non- CO2 greenhouse gases have been issued. CH4 is 21 times more harmful than CO2 and has the 2nd largest contribution to global warming among 6 greenhouse gases. Biogas comprised of CO2 : CH4 = 0.4~5 : 0.6~0.5 (mole fractions) is emitted from landfill, anaerobic digestion of activated sludge, food wastes and animal wastes. It is well-known that, and thus, it should be reduced to delay global warming and recovered CH4 to use as vehicle fuels. The purification has been carried out via three common technologies: absorption, adsorption and membrane separation to concentrate CH4 from biogas and remove CO2, H2S and siloxane. Membrane purification technology has economically many advantages than the other processes in detail automatic operations, dry-condition running in winter, and easy scale-up. The objectives of these studies are to develop a hollow fiber membrane by dry-wet spinning and a membrane purification process for the vehicle fuel from landfill biogas. Properties of polyethersulfone hollow fiber membrane were observed selectivity of CO2/CH4 46 and permeability of CO2 100GPU. CH4 concentration and recovery were obtained 97%, 95% in 2-stage and 97%, 68% in 1-stage process, respectively. |
