Department of Environmental Engineering, Pontifícia Universidade Católica do Paraná, Curitiba, Brazil.
Water Sci Technol. 2010;61(10):2469-75. doi: 10.2166/wst.2010.155.
The purpose of this study was to present a methodology with superior efficiency for inactivating pathogenic indicators commonly found in domestic sewage. The adopted method was based on synergistic effect resulting from the introduction of a UV radiation pre-disinfection stage of sewage followed by secondary treatment. A pilot unit was installed in the sewage treatment plant of the University of São Paulo to simulate the combined system in full-scale operational conditions. Its performance was evaluated through microbiological examinations for determining Escherichia coli, total coliforms and coliphages. The application of UV radiation at 5.1 mW/cm(2) for 10 s of exposure in the first disinfection stage was enough to reduce the surviving number of E. coli around 100 times, in comparison to the conventional method. Therefore, based on experimental data, it is possible to conclude that combining treatment and pre-disinfection stage is an effective potential technique to produce effluents with lower degree of contamination by pathogenic organisms.
本研究旨在提出一种更高效的方法来灭活常见于生活污水中的病原指标。所采用的方法基于引入紫外线辐射预消毒阶段与二级处理的协同效应。在圣保罗大学的污水处理厂安装了一个试验装置，以模拟全规模运行条件下的组合系统。通过微生物学检查来评估其性能，以确定大肠杆菌、总大肠菌群和噬菌体。在第一消毒阶段，应用 5.1 mW/cm(2)的紫外线辐射，暴露 10 秒，即可将大肠杆菌的存活数量减少约 100 倍，与传统方法相比。因此，根据实验数据，可以得出结论，组合处理和预消毒阶段是一种有效的潜在技术，可以生产出污染程度较低的病原体的废水。
