Effects of Seasonal Temperature Variation on Slurry Temperature and Biogas Composition of a Commercial Fixed-Dome Anaerobic Digester Used in Bangladesh

A. S. M. Younus Bhuiyan Sabbir, Chayan Kumer Saha, Rajesh Nandi, Md. Forid Uz Zaman, Md. Monjurul Alam and Shiplu Sarker
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A. S. M. Younus Bhuiyan Sabbir: Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Chayan Kumer Saha: Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Rajesh Nandi: Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Md. Forid Uz Zaman: Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Md. Monjurul Alam: Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Shiplu Sarker: Department of Manufacturing and Civil Engineering, Norwegian University of Science and Technology (NTNU), 2815 Gjøvik, Norway

Sustainability, 2021, vol. 13, issue 19, 1-15

Abstract: Biogas is produced in Bangladesh mostly through fixed-dome anaerobic digesters, which usually operate without any temperature controller. An experiment was conducted to monitor the seasonal temperature variation inside a fixed-dome type digester and its effect on biogas composition. A commercial-scale digester with a working volume of 350 m 3 was used for this study. Three k-type thermocouple sensors were used to monitor the ambient, biogas, and slurry temperatures in real-time. The results showed that the average ambient temperature in the autumn, late autumn, and winter was 29.05, 22.90, and 17.64 °C, respectively. The average slurry temperature in the autumn (30.38 °C) was higher than in the late autumn (29.36 °C) and in the winter (25.76 °C). The highest and lowest slurry temperatures were found to be 31.11 and 24.47 °C, respectively, which indicated that the digester worked within a wide temperature range, establishing both psychrophilic and mesophilic operational conditions. Higher methane concentrations were observed in the autumn than in the late autumn and winter. The CO 2 and H 2 S concentrations were higher in the winter than those of in the autumn and late autumn. The electricity generation in the winter was 47.85% and 45.15% lower than in the autumn and late autumn, respectively.

Keywords: anaerobic digestion; fixed-dome digester; temperature; seasonal variation; biogas (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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