Comprehending the contemporary state of art in biogas enrichment and CO2 capture technologies via swing adsorption

Biogas is a biorenewable energy resource that has the potential to serve as a possible replacement for fossil fuels, especially natural gas and as a hydrogen carrier. However, raw biogas produced via anaerobic digestion process contains a large number of impurities such as hydrogen sulfide and carbon dioxide. Thus, upgradation and purification of the raw biogas by capturing CO2 before its application are necessary. In this regard, swing adsorption (pressure/vacuum/temperature/electrical) technologies have received considerable attention from the research community worldwide as compared to other techniques because of flexibility in operation, high auto-control degree, low energy consumption, and less capital investment. Thus, this review provides a detailed mechanistic insight into the effect of various factors such as type of adsorption technologies, different kinds of adsorbents, bed configuration, source and composition of the biogas, time cycle, and operating conditions on the efficiency of biogas purification process via pressure swing adsorption technologies. Moreover, an overview of the fundamentals of the pressure swing adsorption (PSA) process is provided by focussing on different innovative engineering approaches that contribute to the continuous improvement in process performance. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

Swing adsorption technologies are considered as a flexible, highly automated, low energy consumption, and low capital investment purification technology for biogas. This review examines the impact of various factors on the efficiency of biogas purification using swing adsorption technologies.