2017 Fiscal Year Final Research Report
Nitrogen/phoshorus recovery and digestibility improvement in anaerobic digestion of sewage sludge
| Project/Area Number |
15K06276
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Civil and environmental engineering
|
|---|
| Research Institution | Fukui University of Technology |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2015-04-01 – 2018-03-31
|
| Keywords | anaerobic digestion / sewage sludge / nitrogen recovery / phosphorus recovery / ammonia stripping |
|---|
| Outline of Final Research Achievements |
This study evaluated super-high solids anaerobic digestion fed with sewage sludge of 10-20% total solids (TS), and attempted efficient nitrogen and phosphorus recovery from sewage sludge. Laboratory anaerobic digesters performed well at the hydraulic retention time (HRT) of 20 or 30 days, and showed approximate VS destruction of >50% and gas production of 0.5 NL/gVS. At 15% TS or higher, ammonia stripping was combined for ammonia removal and recovery. The stripping device showed average ammonia recovery of 4.6-16.8 mgN from g influent TS or approximately 40% from influent nitrogen as the highest. The results indicated that methane production is possible up to the influent TS of about 20%, and the side-stream configuration is superior for ammonia recovery. High viscosity and deteriorated dewaterability of digested sludge pose a problem for operation, transport and further processing.
|
| Free Research Field |
土木環境システム
|
