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Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
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Factors Affecting Process Temperature and Biogas Production in Small-scale Rural Biogas Digesters in Winter in
C H Pham1, C C Vu1, S G Sommer1
1Institute of Chemical Engineering, Bio- and Environmental Engineering, Faculty of Engineering, University of Southern Denmark, DK5230 Odense, Denmark .
Asian-Australasian Journal of Animal Sciences
|July 23, 2014
Summary
Insulation and slurry management are key to maintaining digester temperature in subtropical cold seasons. Optimizing slurry storage time can significantly boost biogas production, even in winter.
Area of Science:
- Agricultural Engineering
- Environmental Science
- Renewable Energy
Background:
- Subtropical regions face challenges with low biogas production during cold seasons due to temperature fluctuations.
- Understanding factors affecting digester temperature is crucial for optimizing anaerobic digestion efficiency.
Purpose of the Study:
- To identify key factors influencing digester temperature and heat loss in subtropical climates.
- To evaluate methods for enhancing biogas production during colder months.
Main Methods:
- Four underground composite digesters (two insulated, two uninsulated) were monitored for internal temperature, biogas production, and methane concentration.
- Soil, air, and slurry mixing tank temperatures were continuously measured.
- Influent characteristics and volume were analyzed throughout the study period.
Main Results:
- Seasonal air temperature significantly impacted soil, slurry tank, and digester temperatures, affecting biogas output.
- Digester insulation (Styrofoam), ambient air temperature, and slurry mixing tank temperature were primary determinants of internal digester temperature.
- Storing slurry until its temperature peak (around 14:00 h) was shown to increase digester temperature and potential biogas yield.
Conclusions:
- Insulation and strategic slurry management are vital for maintaining optimal digester temperatures in subtropical winter conditions.
- The study provides algorithms for linking digester temperature to slurry mixing tank temperature, aiding in biogas production optimization.
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