Development of Advanced Wastewater Treatment System for Efficient and Complete Degradation of Refractory Chemicals by Combination of Biological Treatment and Ultraviolet Irradiation

生物处理与紫外线照射相结合高效彻底降解难降解化学品的高级废水处理系统的开发

• 批准号: 06650607
• 负责人: FUJITA Masanori
• 金额: $ 1.28万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650607/
• 关键词: Ultraviolet irradiation; Nonylphenolethoxylate; Pseudomonas sp.TR01; Dead-end metabolite; Complete degradation; Sterilization; 酸化チタン; アルキルフェニルエトキシレート; 中間代謝物; pH; 温度; 懸濁物質

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.

研究了生物处理和紫外线照射与TIO_2作为催化剂的结合，使耐火化学物质完全降解在废水中的可行性。首先研究了非甲氧甲氧基（NPE）作为模型化学物质，并通过分离的细菌菌株假单胞菌SP.TR01进行了生物降解。尽管NPE的聚氧乙烯部分被菌株TR01有效降解，但在培养基中积累了死端产物。该代谢物被鉴定为NPE，其短乙氧基链（NP2EO，NP3EO）及其羧化衍生物（NP2EC，NP3EC）。这些难治性的死末端代谢产物可能会因紫外线照射而降解，而TIO_2则悬浮在反应混合物中，而不会出现HPLC，GC和GC-MS分析的可检测到的副产品，这表明完全降解。随着温度的升高，降解效率提高，但不受反应混合物中溶剂和悬浮材料的影响，降低了效率。这些因素应考虑构建实际治疗系统。