Effective decomposition of persistent organic pollutants by the reaction at the gas-liquid interface with the optimal ultrasonic frequency
| Project/Area Number |
26340057
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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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| Research Field |
Environmental engineering and reduction of environmental burden
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| Research Institution | Saitama University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 超音波分解 / 超音波霧化 / 短波長紫外光 / 促進酸化手法(AOP) / 過フッ化化合物 / 揮発性有機化合物(VOC) / 除去率・無機化率 / 単一周波数 / 分解生成物 / 無機化 / 熱分解 / 過フッ素化化合物 / 分解率･無機化率 / 超音波照射 / 分解率 / 無機化率 / 促進酸化法 |
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| Outline of Final Research Achievements |
We investigated the effects of 200 kHz ultrasonication and short-wavelength UV (UV254+185) irradiation on the degradation of persistent perfluorochemicals, such as perfluorooctane (PFO) with hydrophobic property, and perfluorooctanoic acid (PFOA) and pentafluoropropionic acid (PFPrA) with hydrophilic property that were found as degradation intermediates of PFO. 200 kHz ultrasonic irradiation strongly affected on hydrophobic PFO, and UV254+185 irradiation was more effective for hydrophilic PFOA and PFPrA. On the other hand, volatile organic compound (VOC) gas was decomposed and mineralized effectively in gas phase on the mist surface generated by 2.4 MHz ultrasonication with advanced oxidation process. Furthermore, the optimal frequency that can cause the effects of both frequencies was chosen from the viewpoint of mist generation, and three aldehydes with different physical properties were effectively decomposed thermally inside the cavity and radical reactions on the mist surface.
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Report
(4 results)
Research Products
(36 results)
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[Presentation] Evaluation of chemical reactivity for VOC gas on the ultrasonic mist and the influence of frequency on mist generation2014
Author(s)
K. Sekiguchi, T. Kudo, T. Namiki, N. Namiki, K. Azuma, H. Tamura, Y. Suwa, N. Kagi, S. Fujii, T. Shimura
Organizer
23rd International Symposium on Contamination Control
Place of Presentation
Coex Convention Center（Seoul, Korea）
Year and Date
2014-10-14
Related Report
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