Effect of solid retention time on methane production with thermophilic anaerobic digestion

• Main Authors: You-wei Tu, 涂有為
• Other Authors: Kuen-Sheng Wang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/08744001323086644822

碩士 === 國立中央大學 === 環境工程研究所碩士在職專班 === 99 === This study investigated the effects of solid retention time (SRT) and organic loading rate (OLR) on the fermentation of diluted pig manure (DPM) for methane production. The fermentation was carried out in a 2-liter semi-continuously mixed fermentator controlled at 55℃, using DPM (i.e., 4% in volatile solid content) as substrate. The solid retention time, defined as the ratio of solid volume in the reactor to the volume of draw-and-feet daily , was varied in this study from 10days to 4days, with a 2- days decrement, and the OLR varied accordingly from 18.21 to 45.54 g-VS/L/d. The results indicate that the methane production rate (ml/L/d) decreased with increasing SRT, however, with increasing OLR within the tested ranges. The maximum methane production rate (i.e., 1037 ml/L/d) was found at an OLR of 45.54 gVS/L/d and a SRT of 4 days in this study. On the other hand, the volatile fatty acids (VFAs) was found the concentration of approximately 1000 mg/l. The results of this study may contribute to the bioenergy industry for the design and operation of a methane fermentator.