2012 Fiscal Year Final Research Report
High efficiency and stability in the UASB fed with domestic sewage by high abundance of anaerobic protozoa 1
| Project/Area Number |
22360217
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Civil and environmental engineering
|
|---|
| Research Institution | Nagaoka National College of Technology |
|---|
Principal Investigator |
ARAKI Nobuo 長岡工業高等専門学校, 環境都市工学科, 教授 (30193072)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
YAMAGUCHI Takashi 長岡技術科学大学, 工学部, 教授 (10280447)
|
|---|
| Project Period (FY) |
2010 – 2012
|
| Keywords | 都市下水処理 / 嫌気性処理 / 原生動物 / メタン生成古細菌 |
|---|
| Research Abstract |
Identification of anaerobic protozoa in an UASB pilot plant treating domestic municipal sewage was carried out by 18S rRNA gene cloning to clear how many species existed in. Abundances according to each species were measured by microscopic direct counts throughout three years. Metopus contortus, Metopus palaeformis, Trimyema compressum were predominance as a protozoan in the UASB when present in large numbers. Total cell number of the protozoa shifted with changes in temperature of the sewage, and up to 11x103 cells/mL (fall) and became 0 cells/mL (spring). FISH analysis to Metopus contortus revealed that hydrogen utilizing methanogen present at a level of 104 cells in one protozoan cell as their symbiotic bacteria. Metopus sp played a important role to reduce MLSS in the UASB by their predation.
|
