2023 Fiscal Year Research-status Report
Establishment of Stable Granular Symbiosis of Microalgae and Bacteria with Well Separated Oxygenic Photosynthesis and N2 Fixation in Its Layered Structure
| Project/Area Number |
22K19863
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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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| Keywords | Algal-bacterial granule / Nitrogen fixation / Carbon neutrality / Resource recovery |
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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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[Journal Article] Photosynthetic oxygen-supported algal-bacterial aerobic granular sludge can facilitate carbon, nitrogen and phosphorus removal from wastewater: Focus on light intensity selection2023
Author(s)
Li Z., Wang J., Liu W., Zhao Y., Lei Z.*, Yuan T., Shimizu K., Zhang Z., Lee D.-J.,
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Journal Title
Bioresource Technology
Volume: 388
Pages: 129752
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] Highly efficient carbon assimilation and nitrogen/phosphorus removal facilitated by photosynthetic O2 from algal-bacterial aerobic granular sludge under controlled DO/pH operation2023
Author(s)
Li Z., Wang J., Liu J., Chen X., Lei Z.*, Yuan T., Shimizu K., Zhang Z., Lee D.-J., Lin Y., Adachi Y., van Loosdrecht M.C.M.
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Journal Title
Water Research
Volume: 238
Pages: 120025
DOI
Peer Reviewed / Int'l Joint Research
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