1995 Fiscal Year Final Research Report Summary
Development of Advanced Wastewater Treatment System for Efficient and Complete Degradation of Refractory Chemicals by Combination of Biological Treatment and Ultraviolet Irradiation
| Project/Area Number |
06650607
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Osaka University |
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Principal Investigator |
FUJITA Masanori Osaka University, Department of Environmental Engineering, Professor, 工学部, 教授 (70029289)
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| Co-Investigator(Kenkyū-buntansha) |
IKE Michihiko Osaka University, Department of Environmental Engineering, Research Associate, 工学部, 助手 (40222856)
IWAHORI Keisuke Osaka University, Department of Environmental Engineering, Research Associate, 工学部, 助手 (40183199)
FURUKAWA Kenji Osaka University, Department of Environmental Engineering, Associate Professor, 工学部, 助教授 (60029296)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Ultraviolet irradiation / Nonylphenolethoxylate / Pseudomonas sp.TR01 / Dead-end metabolite / Complete degradation / Sterilization |
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| Research Abstract |
The feasibility of complete degradation of refractory chemicals in wastewater by combination of biological treatment and ultraviolet irradiation with TiO_2 as a catalyst was investigated. Nonylphenolethoxylate (NPE) was selected as a model chemical and its biodegradation by a isolated bacterial strain Pseudomonas sp.TR01 was investigated first. Although the polyoxyethylene part of NPE was efficiently degraded by strain TR01, dead-end products were accumulated in the culture medium. The metabolite was identified as NPE with short ethoxy-chain (NP2EO,NP3EO) and their carboxylated derivattives (NP2EC,NP3EC). These refractory dead-end metabolites could be degraded by ultraviolet irradiation with TiO_2 being suspended in the reaction mixture without occurence of detectable by-products by HPLC,GC,and GC-MS assays, suggesting complete degradation. The degradation efficiency increased with increase of temperature, but was not affected by pH.Soluble and suspended materials in the reaction mixture lowered the efficiency. These factors should be taken into consideration for constructing real treatment systems.
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