2019 Volume 98 Issue 9 Pages 229-233
Anaerobic fermentation technology for methane gas production has been practically use, and it is known that setting of operating conditions according to the raw materials is important. The genus Euglena is studied all over the world for producing useful materials. Commercial production facilities using E. gracilis in the genus Euglena are expected to generate residues in various states. However, anaerobic fermentation characteristics of each are only studied partially. In this study, an anaerobic fermentation test was conducted using slurry, dried cells, degreased dry cells and purified paramylon generated from a commercial production facility of E. gracilis as substrates. The largest gas generation rate was 502.1 ml/g-TS from paramyron, which was 1.75 times that of the slurry. The pH was within 7.2-7.8, and was in a range suitable for methane gas generation. The alkalinity was the lowest in paramylon, 3.7 g-CaCO3/L, and the highest in degreased dry cells, in the range of 4.3 g-CaCO3/L. The results suggest that care should be taken when performing long-term anaerobic fermentation.
