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* Corresponding authors

a Department of Farm Power and Machinery, Faculty of Agricultural Engineering và Technology, Sylhet Agricultural University, Sylhet-3100, Bangladesh

b Department of Advanced Mechanical System Engineering, Graduate School of Science & Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, nhật bản

c Center of Excellence for Advanced Materials Research (CEAMR) & Chemistry Department, King Abdulaziz University, phường O. Box 80203, Jeddah 21589, Saudi Arabia

d Department of Chemistry, School of Physical Sciences, Shahjalal University of Science & Technology, Sylhet-3114, Bangladesh E-mail: krazaul

Biomethane, the principal component of biogas, is one of the major alternatives khổng lồ fossil fuel. Reducing the amount of carbon dioxide (CO2), hydrogen sulfide (H2S) và water (H2O) content from their mixture with methane (CH4) in biogas is necessary for ensuring their practical applications as fuels và the minimum methane (CH4) content is stipulated khổng lồ be 95%. Herein, a facile process for the combined removal of CO2, H2S và H2O by using two different sets of purifying mixtures including calcium hydroxide (Ca(OH)2) + activated carbon + silica gel for experiment T1 và Ca(OH)2 + zero-valent iron (Fe0) + sodium sulphate (Na2SO4) for experiment T2 is presented. The CO2 concentration was reduced from 33% in raw biogas khổng lồ 2.65 và 4.8% in biogas treated in T1 và T2, respectively. The corresponding H2S concentration falls from 365 ppm lớn 14 và 29 ppm, while H2O nội dung decreased from 5% lớn 0.03 and 0.87%. As a result of this physico-chemical minimization of the unwanted gas fraction, the overall biomethane concentration increased from 62% in raw biogas lớn 97.55 & 95.02% in the purified gas after the accomplishment of the purification process by experiments T1 & T2, respectively. We propose that this purification method can be applied in a small farmland or rural area to obtain purified biomethane.