Anaerobic Digestion of Nitrogen-Rich and Lignocellulose-Like Leedstocks: a Case Study on Broussonetia Papyrifera

摘要

This study aims to investigate the anaerobic digestion (AD) performance of Broussonetia papyrifera, a wide distributed nitrogen-rich and lignocellulosic-like plant, for methane production. The fermentation was conducted with the volatile solid (VS) concentration at 0.5%, 1.0%,1.5%,2.0% and 4.0% under 37 degrees C and 55 degrees C for 30 days, respectively. Results suggested that the feedstock concentration at 2.0% and fermentation temperature at 55 degrees C was optimal for the AD treatment of Broussonetia papyrifera. A maximal specific methane yield was achieved at 277.72 +/- 15 mL/g VS, which was 94.71% higher than that for the maximum specific methane under the thermophile condition, likely because that the C/N was more suitable compared with other lignocellulosic biomass. A kinetic study suggested that the modified Gompertz equation was reliable (determination coefficients R-2 greater than 0.97) to describe the kinetic behavior of anaerobic digestion of Broussonetia papyrifera. In general, Broussonetia papyrifera was proved to be a suitabe feedstock for anaerobic digestion for methane production.