2023 Fiscal Year Final Research Report
Thermal Remediation of Highly Concentrated Chlorinated Organic Compounds Infiltrated into Clay Soil and Intrinsic Safety Management
| Project/Area Number |
21H03630
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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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 | Yokohama National University |
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Principal Investigator |
Kobayashi Takeshi 横浜国立大学, 大学院環境情報研究院, 准教授 (60293172)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 土壌浄化技術 / 高濃度有機塩素化合物 / 粘性土壌への浸潤 / 加温浄化 / 本質安全管理 |
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| Outline of Final Research Achievements |
Chlorinated volatile organic compounds (CVOC) have been used in large quantities in the past, and a large number of soil contamination has become apparent, but many sites have not been investigated and are left with serious situations. However, if left unattended CVOC will infiltrate the clay layer, making remediation more difficult.
In this study, we conducted experiments to accelerate elution of CVOC in clay by heating (constant or local heating) and by using ethanol solution and ultrasonic waves. The results suggest that constant heating is the most effective method to accelerate elution and may shorten the purification period by a factor of several. It was also suggested that a 25% ethanol solution could further accelerate. Using the parameters obtained from the experiments, we were able to create a calculation sheet that can be used to determine the infiltration behavior into clay when the contamination is left untreated and Intrinsically safe timing of the end of remediation.
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| Free Research Field |
環境安全化学
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| Academic Significance and Societal Importance of the Research Achievements |
社会に数万も潜在して調査もされずに放置されている高濃度CVOC土壌汚染について、汚染を放置するとより深刻な浄化困難な状況になることを定量的に予測できる計算シートを作成できた。また、加温やエタノールなどを用いた溶出促進実験結果から、土壌や汚染物質の溶出メカニズムを考察することができた。更に浄化困難となった粘性土中のCVOCを数分の1の浄化期間で浄化する新たな技術を提案するとともに、浄化効果を予測したり、浄化終了時期を判断したりできる計算シートを作成、提案することができた。これらのツールの活用することにより、汚染の早期の調査や、効率的な浄化の推進に役立てられると考えられる。
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