本研究以稀釋豬糞的醱酵探討固體停留時間和有機負荷率對甲烷產出的影響，使用稀釋豬糞(亦即，4%揮發性固體含量)為基質，以2公升控溫在55℃的半連續式混合醱酵槽執行本實驗；固體停留時間定義為反應槽體積內固體量維持在每日進出料量，從10天到4天每週期2天遞減，而有機負荷率從18.21 g-VS/L/d到45.54 g-VS/L/d遞增。本研究實驗結果顯示：甲烷產生率隨著固體停留時間的增加而降低，然而，在實驗範圍內卻是隨著有機負荷率的增加而增加；在固體停留時間4天也就是有機負率在45.54 g-VS/L/d中，有最大的甲烷產生量1037 mL-CH4 /L/d，另外，發現揮發性脂肪酸(VFAs)的濃度維持在約1000mg/l。本研究結果可提供生質能源產業設計和甲烷醱酵操作之參考。 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.
