Development of Biogas Separation Process Using DDR-Type Zeolite Membrane

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  • Himeno Shuji
    Department of Civil and Environmental Engineering, Nagaoka University of Technology
  • Takeya Kiwamu
    Department of Civil and Environmental Engineering, Nagaoka University of Technology
  • Fujita Shoichi
    Department of Civil and Environmental Engineering, Nagaoka University of Technology

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Other Title
  • ＤＤＲ型ゼオライト膜を用いたバイオガスのＣＨ４／ＣＯ２分離プロセスの開発
  • DDRガタ ゼオライト マク オ モチイタ バイオガス ノ CH4 CO2 ブンリ プロセス ノ カイハツ

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This study developed a membrane separation process for biogas using a DDR-type Zeolite membrane with high CO2/CH4 selectivity. Biogas produced in a sewage plant was separated and purified by using the DDR-type Zeolite membrane, and the performance and durability of the membrane was estimated. We first analyzed the membrane performance required for a simple, one-stage separation process through a mathematical model and experimentation, and then decided upon the appropriate flow rate through DDR type Zeolite pattern usage. Next, in order to conduct actual biogas separation and purification, we set up a pilot plant within the sewage treatment facility. The purification tests showed that purification was possible with our objective purity of CH4 concentration of 90% and emission CO2 concentration of over 97%. Separation factor of CO2/CH4 and permeation of the DDR-type Zeolite membrane changed little even after 40 h of ventilation. These results demonstrate that the membrane separation process developed is fully applicable to the separation and purification of biogas. Finally, we examined the influence of impurities in the biogas on membrane separation performance by supplying the biogas without pre-treatment for 1600 h. From the results, we believe that membrane performance is reduced by long periods of ventilation and high boiling compounds such as higher hydrocarbons and siloxane, which are present as impurities in the biogas.

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