Kinetic of Biogas Production in Co-Digestion of Vegetable Waste, Horse Dung, and Sludge by Batch Reactors

2018 4th International Conference on Environment and Renewable Energy

生态环境科学;能源学

Dinh, P.V.^1 ; Fujiwara, T.^1 ; Phu, S. T. Pham^1 ; Hoang, M.G.^2

Okayama University, 3-1-1 Tsushima, Kita Ward, Okayama

700-8530, Japan^1

National University of Civil Engineering, 55 Giai Phong, Ha Noi, Viet Nam^2

关键词: Batch experiments;    Biogas production;    High potential;    Kinetic equations;    Least-squares-fitting method;    Mathematical constants;    Nutrient balance;    Vegetable wastes;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/159/1/012041/pdf
DOI  :  10.1088/1755-1315/159/1/012041

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Batch experiments were performed firstly to evaluate co-digestion of vegetable waste (VW), horse dung (HD), and sludge (S). All reactors were set at a temperature of 37°C, pH of 6.7, and total solid 2.5%. Each single-substrate in the mixture played a significant role. In which, VW contributed mainly to the formation of biogas yield, S and HD played nutrient balance role. The biogas yield was in the range of 168-554 Nml/g-TS. Especially, the biogas yield could be estimated from the proportion of the substrates by equation G1Nml/g-TS= 53.7 + 7.448 × VW(%) + 1.922 × HD(%) or from nutrient ratio (C/N) by equation G2Nml/g-TS= 1341 - 48.46 × C/N. Further, the experimental data was applied to evaluate the kinetic equations of biogas production including the Gompertz (G) and Logistic (L) models. Constants in both models were found out by using the least squares fitting method. Both models showed high potential, in which, G model was completely better than L model. However, both models failed at time t=0 day. Moreover, the constant λ in models did not reflect the right definition itself, it was merely a mathematical constant.