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Combined hydrogen sulfide and carbon dioxide removal process for upgrading biogas ; Kombinierter Schwefelwasserstoff- und Kohlendioxidentfernungsprozess zur Aufbereitung von Biogas
Biogas upgrading is an efficient method to increase biogas energy value and to offset world energy demand. However, most of the technologies developed today suffer a setback due to high cost, high energy requirement and greenhouse gas emissions due to methane losses. The combined hydrogen sulfide and carbon dioxide removal process, which integrates both biological aerobic desulphurization and bottom ash CO2 capture method, is a promising alternative for such problems. In the present study, the combined removal process was proved to be technically feasible as well as environmentally safe and economically profitable. Lab scale and pilot test study of the combined removal process proved to enrich methane content of the biogas stream by efficiently removing H2S using sulfideoxidizing bacteria. CO2 was captured and stored mineralogical by bottom ash. Individual biotrickling filter designed for H2S removal showed removal efficiency of 99 % when the loading rate of H2S was 14.2 g S-H2S m-3h-1. Removal efficiency increased for increasing loading rate until the critical loading point. The FISH analysis confirmed the diverse population of sulfide-oxidizing bacteria in the biotrickling filter. Bottom ash with moisture content was able to absorb CO2 gas and efficiently converting it into mineral carbonates. The sorption capacity of bottom ash was found to be 14.5 g CO2.kg-1. The combined removal performance of both process where executed both in lab scale and in the pilot test study. Experimental trials with real biogas proved that the method is technically viable while achieving methane content of 91.1 vol % at the outlet. Life cycle analysis of the combined removal process showed that the global warming potential in terms of kg CO2-Eq is least as compared to Pressure swing adsorption method. Furthermore, a techno-economic analysis was performed to study the economic feasibility and to analyze the hotspots and bottleneck in implementing this technology as compared to that of combined heat and power (CHP) and Pressure ...
Combined hydrogen sulfide and carbon dioxide removal process for upgrading biogas ; Kombinierter Schwefelwasserstoff- und Kohlendioxidentfernungsprozess zur Aufbereitung von Biogas
Biogas upgrading is an efficient method to increase biogas energy value and to offset world energy demand. However, most of the technologies developed today suffer a setback due to high cost, high energy requirement and greenhouse gas emissions due to methane losses. The combined hydrogen sulfide and carbon dioxide removal process, which integrates both biological aerobic desulphurization and bottom ash CO2 capture method, is a promising alternative for such problems. In the present study, the combined removal process was proved to be technically feasible as well as environmentally safe and economically profitable. Lab scale and pilot test study of the combined removal process proved to enrich methane content of the biogas stream by efficiently removing H2S using sulfideoxidizing bacteria. CO2 was captured and stored mineralogical by bottom ash. Individual biotrickling filter designed for H2S removal showed removal efficiency of 99 % when the loading rate of H2S was 14.2 g S-H2S m-3h-1. Removal efficiency increased for increasing loading rate until the critical loading point. The FISH analysis confirmed the diverse population of sulfide-oxidizing bacteria in the biotrickling filter. Bottom ash with moisture content was able to absorb CO2 gas and efficiently converting it into mineral carbonates. The sorption capacity of bottom ash was found to be 14.5 g CO2.kg-1. The combined removal performance of both process where executed both in lab scale and in the pilot test study. Experimental trials with real biogas proved that the method is technically viable while achieving methane content of 91.1 vol % at the outlet. Life cycle analysis of the combined removal process showed that the global warming potential in terms of kg CO2-Eq is least as compared to Pressure swing adsorption method. Furthermore, a techno-economic analysis was performed to study the economic feasibility and to analyze the hotspots and bottleneck in implementing this technology as compared to that of combined heat and power (CHP) and Pressure ...
Combined hydrogen sulfide and carbon dioxide removal process for upgrading biogas ; Kombinierter Schwefelwasserstoff- und Kohlendioxidentfernungsprozess zur Aufbereitung von Biogas
Rajavelu, Keren (Autor:in) / Denecke, Martin
19.09.2018
Hochschulschrift
Elektronische Ressource
Englisch
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