International Journal of Environmental Science and Development

Abstract—We evaluated the adsorption of CO₂ in biogas mixtures using the combination of adsorbents: natural zeolite-natural zeolite (Z-Z), natural zeolite-chicken manure based biochar (Z-CM) and natural zeolite-biogas sludge based biochar (Z-BS). The amount of CO₂ adsorption was controlled at room temperature and under a gas pressure range of 5-7 bar. Samples of biogas before and after adsorption were analyzed by gas chromatography (GC) to determine the percentage of CH₄. The relationship between the percentage of CH₄ composition and calorific value of biogas was investigated. The results of data from GC showed that the highest CH₄ enrichment was performed by Z-CM (28.92%). The highest CH4 enrichment increased the calorific value of biogas in comparison to biogas before adsorption. The result suggested that CO₂ adsorption using natural zeolite and chicken manure based biochar successfully increased the calorific value of biogas.

Index Terms—Biogas, CO₂ adsorption, calorific value, and biochar.

A. Pertiwiningrum is with the Faculty of Animal Science of Universitas Gadjah Mada, Yogyakarta, CO 55281 Indonesia (e-mail: artiwi@mail.ugm.ac.id).
A. W. Harto and R. Budiarto are with the Engineering Physics Department, Universitas Gadjah Mada, Yogyakarta, CO 55281 Indonesia (e-mail: andangftn@yahoo.com, rachmawan@yahoo.com).
M. A. Wuri is with the Environmental Engineering Department, Christian University of Surakarta, Surakarta, CO 57143 Indonesia (e-mail: margarethaarnita@gmail.com).

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Cite: Ambar Pertiwiningrum, Andang W. Harto, Margaretha A. Wuri, and Rachmawan Budiarto, "Assessment of Calorific Value of Biogas after Carbon Dioxide Adsorption Process Using Natural Zeolite and Biochar," International Journal of Environmental Science and Development vol. 9, no. 11, pp. 327-330, 2018.