Study potential and characteristics of mixture leafy vegetable wastes for biogas production in anaerobic batch digestion

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ABSTRACT One of the problems faced by the world today is the management of all types of waste and energy crisis. The rapid growth of population, uncontrolled and unmonitored urbanization has created various problems of energy requirement and solid waste disposal. Particular, Kunming district, Yunnan province, P R China is the improvement of people’s living standards, which the total area of Yunnan’s vegetables cultivation has increased slightly and become more and more intensive, diversified, and refined. Therefore, the experiment aimed to study the potential and characteristics of mixture leafy vegetable wastes for daily biogas production and to evaluate the performance of methane contents in biogas produced every 3 days. The experiment designed in triplicate experiments by using the plastic bottles as a reactor with a net capacity of 500 ml, and each triplicate of treatment reactors for 400 ml of working volume at 30±°C for 30 days. The experimental results showed the biogas production on first few days was observed that it cannot be ignited the flame, but the was the highest of CO2 values in biogas volume that this was might be the rapidly acidification phenomenon due to the lower pH of the liquor wastes and lager production of volatile fatty acids of the reactors. There was 59 g of sample group A (MLVW) could produce the highest 65.2% of methane contents of biogas produced, its methane yield was 0.73 l/gVS added and the biogas yield was 0.987 l/gVS when 88.4%of VS in the sample was added and hydraulic retention time was in 17 days. Observation, the biogas yield volume of 0.817 l/gVS was in 2.894 l of the total biogas production from 46 g of the sample group B (VRW), and its methane content was averaged about 56.6% when 76.2% of VS was added in the sample. In distinction, 59 g of the sample group C (VJW) had just produced 2.610 l of total biogas production, but its biogas yield was 0.637 l/gVS added, the methane contents were 58.6% and methane yield was 0.42 l/gVS by adding 88% of VS, which the sample group A, B, and C respectively were in the range 17 and 18 days of hydraulic retention time.