2017 Fiscal Year Annual Research Report
Formation of Granules with High Phosphorus Content to Realize Efficient Phosphorus Recovery from Waste Activated Sludge by Using Anaerobic Digestion Followed by Aerobic Granulation Technology
| Project/Area Number |
15K00599
|
|---|
| Research Institution | University of Tsukuba |
|---|
Principal Investigator |
雷 中方 筑波大学, 生命環境系, 准教授 (30634505)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
張 振亜 筑波大学, 生命環境系, 教授 (20272156)
|
|---|
| Project Period (FY) |
2015-04-01 – 2018-03-31
|
| Keywords | Aerobic granular sludge / P recovery / N recovery / P bioavailability / Hydrothermal treatment / Activated sludge |
|---|
| Outline of Annual Research Achievements |
During the last year of this project, we tested the possibility of simultaneous N and P recovery from anaerobically digested sludge by coupling hydrothermal pretreatment and magnesium ammonium phosphate (MAP) precipitation (Bioresource Technology 243(2017)634-640). The optimum condition for simultaneous N and P recovery was determined at pH 9 and Mg/P molar ratio of 1, achieving 91.60% and 54.88% for P and N recovery from the hydrolysate respectively in addition to MAP purity of 84.24%. We also investigated the effect of ferrous iron dosing strategy on aerobic granulation of activated sludge and bioavailability of P accumulated in granules (Bioresource Technology Reports 2(2018)7-14). It was shown that averagely > 96% DOC and 99% ammonia N could be removed under Fe dosing strategies in which the constant Fe2+ dosage strategy was more beneficial for bioavailable P accumulation. Results show that > 92% P was removed from wastewater and accumulated in granules with bioavailable P of 95%. In addition, we found that continuous-flow reactors could also be used for granular sludge systems, obtaining stable organics, N and P removals (Bioresource Technology 244(2017) 225-233). In this regard, we extended our research to algal-bacterial granules which are prospected to possess more potentials for nutrients (C, N & P) uptake and pollutants removal from wastewater.
In addition to 2 invited presentations in international conferences, we published the related experimental results in 7 international papers. Currently another 3 papers are still under review.
|
