Characteristic study on solid-state thermophilic anaerobic co-digestion of rice straw and pig manure.

• Main Authors: Chien-hung Chen, 陳建宏
• Other Authors: Ing-jia Chiou
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/16379601050883097757

碩士 === 國立中央大學 === 環境工程研究所碩士在職專班 === 100 === A high temperature(55℃) solid-state anaerobic digestion system equipped with leachate recirculation apparatus was adopted in this study. Digestion of pig manure with rice straw was carried out that the rice straw may balanced the nutrition requirements for digestion and may provide the mass with porosity to facilitate the leachate recirculation. Un the study, four mix ratios of rice straw/pig manure (i.e., 0, 0.5, 1, and 1.5, based on dry weight of pig manure) were tested for methane generation. The mixture for digestion has a initial C/N ratio ranging from 14 to 30, and a initial VS 17.68 to 31.21%. During the digestion process, the concentration of acetate acid generated was found ranging from 7,849~10,884 mg/L, and propionate acid from 5,068~6,987 mg/L. Methane generation increased from 25 ml-CH4/g-feed VS to 167 ml-CH4/g-feed VS, and cumulative methane production from 2,210 ml-CH4 to 34,701 ml-CH4, indicating methane generation increased with the mix ratio of rice straw. However, Adding 55 gram of rice straw in pig manure of the experiment responses that pH sharp rises to 7.91 in the digestive process, meanwhile, the ammonia concentration is 1,972 mg/L. Furthermore, the cumulative methane production, specific methane yield and average methane concentration are the worst profile in these experiments. These performances conform to literatures pointed that pH ≧8 induce the ammonia concentration will be relatively increased, further, inhibited the methane production.