Comparative Studies on Methane Upgradation of Biogas by Removing of Contaminant Gases Using Combined Chemical Methods

Muhammad Rashed Al Mamun; Shuichi Torii; Muhammad Rashed Al Mamun; Shuichi Torii

doi:10.3934/energy.2015.3.255

AIMS Energy

2015, Volume 3, Issue 3: 255-266. doi: 10.3934/energy.2015.3.255

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Comparative Studies on Methane Upgradation of Biogas by Removing of Contaminant Gases Using Combined Chemical Methods

Muhammad Rashed Al Mamun ,
Shuichi Torii ^,

Thermal Engineering Laboratory, Department of Mechanical System Engineering, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555 Japan

Received: 30 March 2015 Accepted: 12 July 2015 Published: 15 July 2015

Biogas, which generated from renewable sources can be used as a sustainable energy to achieve resourceful targets of biofuel for internal combustion engines. This process can be achieved in combined absorption and adsorption chemical way. This method can be employed by aqueous solutions of calcium hydroxide, activated carbon, iron(II) chloride, silica gel and sodium sulfate respectively. The presence of CO₂, H₂S and H₂O in the biogas has lowering the calorific value and detrimental corrosion effects on the metal components. Removal of these contaminants from the biogas can therefore significantly improve the gas quality. A comparison study was investigated using combined chemical methods of improving the calorific value of biogas. Experiment results revealed that the aqueous solution used effectively in reacting with CO₂ in biogas (over 85-90% removal efficiency), creating CH₄ enriched biogas. The removal efficiency was the highest in method 1, where efficiency results were 91.5%, 97.1% and 91.8%, for CO₂, H₂S, and H₂O, respectively. The corresponding CH₄ enrichment was 97.5%. These results indicate that the method 1 is more suitable compare to method 2. However, both methane enrichment processes might be useful for cleaning and upgrading methane quality in biogas.
- biogas,
- methane,
- hydrogen sulfide (H₂S),
- carbon dioxide (CO₂),
- water (H₂O)
Citation: Muhammad Rashed Al Mamun, Shuichi Torii. Comparative Studies on Methane Upgradation of Biogas by Removing of Contaminant Gases Using Combined Chemical Methods[J]. AIMS Energy, 2015, 3(3): 255-266. doi: 10.3934/energy.2015.3.255

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Abstract

Biogas, which generated from renewable sources can be used as a sustainable energy to achieve resourceful targets of biofuel for internal combustion engines. This process can be achieved in combined absorption and adsorption chemical way. This method can be employed by aqueous solutions of calcium hydroxide, activated carbon, iron(II) chloride, silica gel and sodium sulfate respectively. The presence of CO₂, H₂S and H₂O in the biogas has lowering the calorific value and detrimental corrosion effects on the metal components. Removal of these contaminants from the biogas can therefore significantly improve the gas quality. A comparison study was investigated using combined chemical methods of improving the calorific value of biogas. Experiment results revealed that the aqueous solution used effectively in reacting with CO₂ in biogas (over 85-90% removal efficiency), creating CH₄ enriched biogas. The removal efficiency was the highest in method 1, where efficiency results were 91.5%, 97.1% and 91.8%, for CO₂, H₂S, and H₂O, respectively. The corresponding CH₄ enrichment was 97.5%. These results indicate that the method 1 is more suitable compare to method 2. However, both methane enrichment processes might be useful for cleaning and upgrading methane quality in biogas.

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