With the increasing global demand for energy, renewable and sustainable biogas has attracted considerable attention. However, the presence of various gases such as methane, carbon dioxide (CO2), nitrogen, and hydrogen sulfide in biogas, and the potential emission of acid gases, which may adversely influence the environment, limits the efficient application of biogas in many fields. Consequently, researchers have focused on the upgrade and purification of biogas to eliminate impurities and obtain high-quality and high-purity biomethane with an increased combustion efficiency. In this context, the removal of CO2 gas, which is the most abundant contaminant in biogas, is of significance. Compared to conventional biogas purification processes such as water scrubbing, chemical absorption, pressure swing adsorption, and cryogenic separation, advanced membrane separation technologies are simpler to implement, easier to scale, and incur lower costs. Notably, hollow fiber membranes enhance the gas separation efficiency and decrease costs because their large specific surface area provides a greater range of gas transport. Several reviews have described biogas upgrading technologies and gas separation membranes composed of different materials. In this review, five commonly used commercial biogas upgrading technologies, as well as biological microalgae-based techniques are compared, the advantages and limitations of polymeric and mixed matrix hollow fiber membranes are highlighted, and methods to fabricate and modify hollow fiber membranes are described. This will provide more ideas and methods for future low-cost, large-scale industrial biogas upgrading using membrane technology.
|Publication status||Published - 2022 Sept|
Bibliographical noteFunding Information:
This research was carried out under the Korea Institute of Civil Engineering and Building Technology (KICT) Research Program (project no. 20210154-001 ) funded by the Ministry of Science and ICT, Republic of Korea . R. H. Hailemariam and J. Sim also acknowledge admin support from the University of Science & Technology (UST), Republic of Korea.
© 2022 The Authors
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Environmental Chemistry
- Public Health, Environmental and Occupational Health
- Health, Toxicology and Mutagenesis