Combined H2S and CO2 removal process for upgrading biogas

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Keren Jenifer Rajavelu

University of Duisburg Essen, Germany

: Expert Opin Environ Biol

Abstract

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Raw biogas can be simply used in CHP (combined heat and power) and boilers, but when it comes to vehicle fuel standards or injecting into a gas grid, it is more required to clean the biogas. Upgrading biogas involves removal of impurities such as H2S and CO2. Cleaning or upgrading of biogas increases the methane content from 60% to 99%. Many upgrading technologies are already established on a large-scale such as PSA, amine and water scrubbing. What is more lacking is the detailed knowledge on its use in small scale applications which is also highly cost consuming. The aim of this research involves developing an upgrading technology with combined CO2 and H2S removal. The research focuses on H2S removal using biological process with sulfur oxidizing bacteria also known as desulphurization and CO2 removal or carbonation process using bottom ash, a waste by-product produced in tons from an incineration plant each year. Results obtained from individual lab-scale processes demonstrated removal efficiency of 99 % in H2S removal with the loading rate of 14.285 g S-H2S m-3.h-1 and CO2 sorption capacity of 14.56 kg CO2.t-1 with wet bottom ash. The anticipated outcome of combining the above two processes and to study the interaction and feasibility of the combined removal technique can lead to low cost as well as an energy efficient approach to biogas upgrading.

Biography

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Email: karey.paul@gmail.com