| 研究実績の概要 |
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.
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