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The increasing negative effects of hydro carbon fossil fuels on the environment has called for quest for alternative source of energy. Among the renewable energy sources, biogas has been evaluated as one of the most effective, efficient and environmentally benign sources of energy. This study evaluates the flammability of biogas produced from cow dung compared with firewood. The experiment was conducted batch wise in mixing ratio 1:1 at mesophilic temperature under 25 days retention time. Weighing balance was used to measure the cow dung and firewood. Biogas production and firewood flammability were measured using combustibility test in seconds using stopwatch. The total gas yield was burnt and recorded 5,088 seconds (1hour 24.8mins), on average 1kg of cow dung produces biogas that burns for 636 seconds (10.6mins), the gas burnt with clear blue flame revealing the effectiveness of water scrubbing method, while the 8kg of firewood was burnt 8,208 seconds (2hours 28mins). On average 1kg of wood fuel burns for 1,026 seconds (17.1 mins). Comparing the result in term of flammability and efficiency, Biogas could be used as waste management option, generate light and run vehicles and at the same time replace the use of firewood which produces toxic gases that are harmful to health, thus biogas is more efficient.

Comparative Study on the Rate of Flammability of Biogas and Firewood