| Project/Area Number |
22K19863
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 64:Environmental conservation measure and related fields
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| Research Institution | University of Tsukuba |
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Principal Investigator |
雷 中方 筑波大学, 生命環境系, 准教授 (30634505)
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| Co-Investigator(Kenkyū-buntansha) |
原 田 筑波大学, 生命環境系, 助教 (80868258)
張 振亜 筑波大学, 生命環境系, 名誉教授 (20272156)
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| Project Period (FY) |
2022-06-30 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2024: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Keywords | Algal-bacterial granule / Nitrogen fixation / Carbon neutrality / Resource recovery / N2 fixation / Functional biomass |
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| Outline of Research at the Start |
This research for the first time will establish a well separated oxygenic photosynthesis and N2 fixation in the outer and inner layers of algal-bacterial aerobic granular sludge biosystem that can efficiently treat waste/wastewater with no C and/or N, and simultaneously produce functional biomass.
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| Outline of Annual Research Achievements |
(1) Cyanobacteria cells and its granules exhibited higher nitrate than ammonia removal capacity, in which cyanobacteria granules can uptake 100% of nitrate and fix a large amount of N2 into granular biomass, especially under N2 recirculation condition.
(2) Dissolved oxygen and pH were found the two crucial parameters for the stable operation of granule system. The proposed future algal-bacterial granule-based wastewater treatment plants can remove all CO2 produced in the plants.
(3) Besides three invited reports in international conferences/seminars, seven high-quality papers with a total impact factor of 87.9 were published.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
We have already achieved the expected targets of the project, i.e. N fixation and carbon neutrality with no need of mechanical aeration, the most energy-intensive operation in wastewater treatment plants if algal-bacterial granules are applied in their biological treatment units.
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| Strategy for Future Research Activity |
(1) Examine the sensitivity of algal-bacterial granules to different types of carbon and nitrogen sources and different salinity levels;
(2) Search a simple and feasible means to maintain the stable granule's layered structure with less or no greenhouse gases (GHGs) emission from the established algal-bacterial granule system; and
(3) Figure out the role of microalgae and/or cyanobacteria in reduced GHGs emission from the granule system.
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