Oxidative remediation of persistent organic compounds by FeS2/H2O/O3 reaction system

2020 Fiscal Year Final Research Report

• Project/Area Number: 16K00606
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Modeling and technologies for environmental conservation and remediation
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Hara Junko 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (40374996)
• Project Period (FY): 2016-04-01 – 2021-03-31
• Keywords: 土壌汚染 / 現位置浄化技術 / 化学的酸化分解

Outline of Final Research Achievements

The chemical oxidation for mono-aromatic compounds in FeS2/H2O/O3 system was estimated in this research. The reactive radial species using FeS2 oxidants was cleared, and reaction mechanism, accumulation of by-products of each aromatic compounds were quantitatively evaluated in laboratory experiments. The decomposition ability was different in each mono-aromatic compound, benzene ring was easily opened and degraded to low molecular organic acid. Particularly toluene was persistent among them, and which need combined use with hydrogen peroxide. The effective oxidant with FeS2 reaction was depend on the substituent group of benzene ring.
In addition, this oxidative remediation method is worried about soil acidification occurred by long term sulfide dissolution. The natural neutralization ability of after treatment soils were also evaluated in here.

Free Research Field

地圏環境工学、地球化学

Academic Significance and Societal Importance of the Research Achievements

残留性有機化合物による土壌・地下水汚染は、国内外で汚染事例が後を絶たず、工業活動を優先してきた都市地域では原位置で短期的に浄化可能な処理技術の開発が求められている。本研究は、分解速度の速い化学的酸化分解法に着目し、検証が不十分なFeS2/H2O/O3反応系における芳香族化合物に対する分解力、反応機構、浄化処理後の自然環境修復能について評価し、浄化手法としての適用可能性および安全性を明らかにした。対象とした反応系における対象物質の分解反応機構を明らかにした学術的意義は高く、検証が不十分な浄化手法の反応副産物の蓄積有無や浄化処理後の環境修復を加味した研究は環境保全を目指す社会に必要な情報である。