Comparative evaluation of biogas production from Poultry droppings, Cow dung and Lemon grass

The study explored the production of biogas from Lemon grass, Cow dung and Poultry droppings. Thethree substrates were pre-fermented according to standard methods. Six (6) kg of each pre-fermentedsubstrate was mixed with water in ratio 1:1 v/v to form slurry and digested for 30 days. A total of0.125 m3, 0.191 m3and 0.211 m3of biogas were respectively produced from the Lemon grass, Cow dungand Poultry droppings with deviations of 0.00234 m3, 0.00289 m3and 0.00484 m3respectively. The cook-ing test carried out revealed that the scrubbed gas had higher cooking rates for water (0.12 L/min,0.085 L/min and 0.079 L/min for Lemon grass, Cow dung and Poultry droppings respectively) while thecooking rates for unscrubbed gas were 0.079 L/min, 0.064 L/min and 0.06 L/min respectively. The pH ofthe medium fluctuated optimally between 6.5 and 7.8. The research demonstrated that Lemon grass pro-duced less volume but better quality biogas compared to Cow dung and Poultry droppings