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.

研究了以TiO_2为催化剂，采用生物处理和紫外光照射相结合的方法完全降解废水中难降解化学品的可行性。选择壬基酚聚氧乙烯醚（NPE）作为模型化合物，首先研究了其在分离菌株假单胞菌TR 01中的生物降解情况。虽然NPE的聚氧乙烯部分被TR 01菌株有效地降解，死端产物在培养基中积累。代谢产物经鉴定为短乙氧基链NPE（NP 2 EO、NP 3EO）及其羧基化衍生物（NP 2 EC、NP 3EC）。这些难降解的死端代谢物可以被紫外光照射降解，而TiO_2悬浮在反应混合物中，通过HPLC，GC和GC-MS分析没有检测到的副产物的出现，表明完全降解。降解效率随温度的升高而增加，但不受pH值的影响。反应混合物中的可溶性和悬浮性物质降低了降解效率。在构建真实的处理系统时应考虑这些因素。