2023 Fiscal Year Final Research Report
Nitrogen removal by a 2 inflow non-aerated nitritation/anammox reactor using carbon fiber media
| Project/Area Number |
21K12291
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 64020:Environmental load reduction and remediation-related
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| Research Institution | Kanazawa University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
松浦 哲久 金沢大学, 地球社会基盤学系, 准教授 (90771585)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | アナモックス / 部分硝化 / 1槽型 / 排水処理 |
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| Outline of Final Research Achievements |
Nitrogen removal using anammox bacteria (AMX) has attracted attention as an energy-saving wastewater treatment method. In this study, we proposed an aeration-free one-stage reactor using carbon fiber carriers to further save energy consumption and establish a stable treatment method. The optimum operating conditions and microorganisms community were investgated using an labo-scale reactor. The results showed that nitrogen could be removed when the wastewater was added from the top end of the carbon fiber, and a nitrogen removal rate of 0.3 kg-N/m3/d was achieved with a hydrolic retantion time of 1.5 hours. In the absence of circulation, ammonia-oxidizing bacteria (AOB) dominated in the biofilm formed on the carbon fiber in gas phase and AMX in the liquid phase. In contrast, circulation induced a co-dominance of AOB and AMX in the gas phase.
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| Free Research Field |
環境工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，当初期待した微生物のすみ分けを誘導することができたが，すみ分けを行った場合と共存2重生物膜で処理する場合の優位性については今後検討する必要がある．
提案した処理法により，滞留時間1.5時間で流入のアンモニアを30m/L程度削減できたことから，下水処理において硝化抑制運転により省エネルギー化を図り，処理水を本処理装置に通すことで，処理水中のアンモニアの削減が可能となることを示しており，省エネルギーな排水処理として，活用が期待できると考えられる．一方，炭素繊維担体を用いることにより，短期間でアナモックス微生物を集積できたことから，今後のアナモックス処理に有効性が示された．
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