2022 Fiscal Year Final Research Report
Are excessively added chelating agents for heavy metal stabilization a safety valve or a pollution source in landfill sites?
| Project/Area Number |
20K04755
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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 22060:Environmental systems for civil engineering-related
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| Research Institution | Osaka Metropolitan University (2022)
Osaka City University (2020-2021) |
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Principal Investigator |
Mizutani Satoshi 大阪公立大学, 大学院工学研究科, 准教授 (80283654)
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| Co-Investigator(Kenkyū-buntansha) |
貫上 佳則 大阪公立大学, 大学院工学研究科, 教授 (90177759)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 有機キレート剤 / 都市ごみ焼却飛灰 / 重金属 / 溶出試験 / 最終処分場 / 浸出水 / 内水ポンド |
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| Outline of Final Research Achievements |
The leachate and the water of the inland water pond, the contact oxidation tank and the nitrification tank from the landfill site where municipal solid waste incineration ash was disposed, were analyzed once every two weeks for more than two years. Two types of chelating agents were detected, and their nitrification inhibitory properties were also confirmed. However, it was confirmed that the chelating agent was decomposed during the leachate treatment process, and the nitrification inhibitory effect was weakened.
Simulated stabilized fly ash was prepared by adding chelating agents in the range of 0 to 15 wt%, and serial batch test and column leach test were conducted. As a result, almost all of the excessively added chelating agent was eluted. Furthermore, the complexation constants of the chelating agents with lead, zinc, cadmium, and copper were determined, and the dissolution behavior was quantitatively discussed.
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| Free Research Field |
廃棄物管理工学
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| Academic Significance and Societal Importance of the Research Achievements |
実浸出水中のキレート薬剤濃度を2年以上に渡って調べた知見は非常に貴重である。また過剰に添加されたキレート薬剤はほぼ全量が溶出すること，余剰キレートが浸出水中の重金属の安定化に効果があることを示したのは，国際的にも非常に意義が大きい。また，キレート薬剤の検出状況や硝化阻害性が浸出水プロセスで低下していくことを示したこと，キレート薬剤の重金属との錯体生成定数を求められたことは，最終処分場と焼却灰の適正管理を進めていく上で，社会的にも非常に有意義である。
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