Optimization of Reactor Temperature for Continuous Anaerobic Digestion of Cow Manure: Bangladesh Perspective

Converting organic waste into energy through anaerobic digestion is gaining popularity day by day. The reactor temperature is considered as one of the most vital factors for the digestion process. An experiment was conducted in the Biogas Laboratory of Green Energy Knowledge Hub at Bangladesh Agricu...

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Bibliographic Details
Published in:Sustainability 2020-11, Vol.12 (21), p.8772
Main Authors: Nandi, Rajesh, Saha, Chayan Kumer, Sarker, Shiplu, Huda, Md. Sanaul, Alam, Md. Monjurul
Format: Article
Language:English
Subjects:
Accuracy
Alternative energy sources
Ammonia
Anaerobic digestion
Animal wastes
Biogas
Cattle manure
Clean energy
Continuously stirred tank reactors
Dung
Energy resources
Experiments
Farm buildings
Gases
Methane
Microorganisms
Natural gas
Natural gas reserves
Nitrogen
Optimization
Organic wastes
Reactors
Renewable resources
Retention time
Sensors
Statistical analysis
Temperature effects
Volatile fatty acids
Volatile solids
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Summary:Converting organic waste into energy through anaerobic digestion is gaining popularity day by day. The reactor temperature is considered as one of the most vital factors for the digestion process. An experiment was conducted in the Biogas Laboratory of Green Energy Knowledge Hub at Bangladesh Agricultural University (BAU) to examine the influence of temperature on anaerobic digestion of cow-dung. Laboratory-scale continuous stirred tank reactors with a working volume of 15 L were operated for a 30-day retention time. The reactors were set at 20 °C, 25 °C, 30 °C, 35 °C, 40 °C and 45 °C, respectively to determine the effect of temperature on anaerobic digestion performance. Different parameters like total solids, volatile solids, pH, volatile fatty acids, ammonia nitrogen, total nitrogen, biogas production rate and methane concentration were examined. Among all the reactors, the reactor at 40 °C temperature produced maximum biogas (312.43 L/kg VS) and methane yields (209.70 L/kg VS), followed by the reactors at 35 °C and 30 °C, respectively. Statistical analysis of the obtained experimental results using Minitab® showed that the optimum process performance in terms of methane yield and volatile solid degradation is achieved at a reactor temperature of 35.82 °C.
ISSN:2071-1050
2071-1050
DOI:10.3390/su12218772