DEVELOPMENT OF COMPREHENSIVE EVALUATION ANALYTICAL METHOD FOR CONSTRUCTION OF URBAN WATER RECYCLE SYSTEM

本研究旨在开发一种城市水循环系统的综合评价方法，通过引入一种新的水质分析来评估在不同场合可能导致的城市排污物再利用的潜在风险，并通过对采用不同废水回收和再利用方案的替代水回用系统进行生命周期评价。作为研究期间的最后一年，一种按年建立的评价方法已被应用于东京玉马河的水质评价。现场调查了DNA损伤物质的彗星试验和耐药细菌的分布情况。结果表明，随着城市污水的排放，包括污水处理厂出水在内的城市污水中的抗生素抗性细菌数量明显增加。考虑到城市水回用以保持水环境的游憩和景观价值的需求日益增长，指出对废水的深度处理提出了越来越高的要求。一项新的指标，如彗星试验数据和抗药性细菌，清楚地表明需要处理某些传统废水处理系统没有很好处理的有机物质。对于如此高级的治疗，核因子提供了一种选择。因此，我们进行了LCA来评估添加到常规废水处理中的纳滤池深度处理方案。结果表明，在塔玛河流域的可持续发展研究中，可降低人类健康风险、增加可持续供水的方案是值得考虑的。

This study aims to develop a comprehensive evaluation method for urban water recycle systems, by introducing a new water quality analysis for a potential risk evaluation that may cause in reuse of urban discharges in various occasions, and by applying a LCA of alternative water reuse systems where a various wastewater reclamation and reuse options are adopted.As the last year of the research periods, an evaluation method that has been established by the year has been applied to evaluate water quality in Tama River in Tokyo. The comet assay for DNA damaging substances and the distribution of antibiotic resistant bacteria were investigated in the field survey. It is shown that the number of antibiotic resistant bacteria was increased due to the discharge of urban wastewater including sewage treatment plant effluent. Considering an increasing demand of urban water reuse for maintaining recreational and scenery values of water environment, it is pointed that a high degree of advanced treatment of wastewater is required more and more. A new index like comet assay data and antibiotic resistant bacteria clearly shows a need for treatment a certain organic substances that are not well treated by conventional wastewater treatment systems. For such an advanced treatment, NF gives one of options. Therefore, a LCA was conducted to evaluate NF advanced treatment options that is added to normal wastewater treatment. It is shown that the options which is capable of reduction in human health risk and increase in self-sustainable water supply are worthwile to be considered in the ease study of Tama River watershed.