we present a novel pressure-cascaded stripping configuration for membrane contactor biogas upgrading processes. Employing polypropylene (PP) hollow fiber membrane modules and water as physical absorbent, the effects of absorption pressure, gas-liquid flowrate, and vacuum mode were systematically studied. In addition, exploiting the solubility difference between CO2 and CH4, as well as the preferential absorption of CO2 in water, a pressure-cascaded stripping tank was implemented to recover and recycle the absorbed CH4 in high purity. The proposed configuration simultaneously enhanced the bio-methane yield (90%) and purity (97%). This project is supported by the "R&D Center for reduction of Non-CO2 Greenhouse gases (2013001690002)" funded by Korea Ministry of Environment(MOE) as "Global Top Environment R&D Program".

• 박아름이(한국화학연구원 분리막연구센터) | Ahrumi Park
• 김영미(한국화학연구원 분리막연구센터) | Young Mi Kim
• 김정(한국화학연구원 분리막연구센터) | JeongF. Kim
• 이평수(한국화학연구원 분리막연구센터) | Pyung Soo Le
• 조영훈(한국화학연구원 분리막연구센터) | Young Hoon Cho
• 박호식(한국화학연구원 분리막연구센터) | Ho Sik Park
• 남승은(한국화학연구원 분리막연구센터) | Seung Eun Nam
• 박유인(한국화학연구원 분리막연구센터) | You-In Park
• 이광현(동의대학교 화학공학과) | Kwanghyun Lee