STRATEGY FOR OPTIMUM MANAGEMENT OF WATER PURIFICATION SYSTEM WITH CONSIDERATION OF TOTAL ENVIRONMENTAL LOAD AND COST-BENEFTT

考虑总环境负荷和成本效益的净水系统优化管理策略

基本信息

批准号：
18360237
负责人：
MICHIOKU Kohji
金额：
$ 6.07万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

In order to minimize the organic compound loads on a reservoir impoundment, performance of water purification systems including hypolimnetic aeration, selective withdrawal and vegetation in littoral zones were investigated by making field measurement and a numerical simulation of water quality. Focus was placed on behaviors of dissolved oxygen, nutrients and organic matters.A water quality model was developed so that seasonal variation of water quality by considering various biochemical processes involved in the water quality balance. Model parameters were carefully determined so as to accurately reproduce the field data, where dissolved oxygen balance associated with hypolimnetic aeration was taken into consideration. The aeration system was a micro-bubble aerator unit that is able to generate fine bubbles with high solubility. In addition to the aeration, selective withdrawal operation was considered to regulate dissolved oxygen profile. Various types of system operation scenarios we … More re assumed with respect to aeration and selective withdrawal in order to maximize water purification performance. The basic idea for optimizing the system operation is to minimize total environmental loads not only on the water systems but also on the atmospheric environment as well as to maximize the cost-benefit. In the cost-benefit analysis, the initial cost necessary for the system construction and the running cost were taken into consideration. Parameters indicating the water purification performance, the cost and the total environmental loads were proposed so that an optimum strategy for the operation of the aeration system and the selective withdrawal devices was finally proposed.On the other hand, an in-situ experiment on intermittent operation of the aeration system was carried out in order to find the best cost-performance operation by considering solubility and loss of the oxygen that is dependent on the seasonalvariation of thermal structure. The best operation of the intermittent aeration system was found through water quality measurement, which is able to minimize the energy consumption and emission of carbon dioxide.As one of another ways of the water purification, nutrient intake performance of vegetation in littoral zone was investigated through a field survey in a natural lake.The results from the present research program are to provide a new direction of dam reservoir management that is useful for environmental engineering use in the next years. Additionally, the total environmental loads on a river catchment can be minimized by applying the present research results. Less

为了最大限度地减少水库蓄水的有机化合物负荷，通过现场测量和水质数值模拟，研究了水净化系统的性能，包括浅层曝气、选择性抽取和沿岸地区植被，重点关注溶解的行为。开发了水质模型，通过考虑水质平衡中涉及的各种生化过程，仔细确定了水质的季节性变化，从而准确地再现了溶解氧平衡的现场数据。与低生理性有关曝气系统是一种能够产生高溶解度细小气泡的曝气装置，除了曝气之外，还考虑了选择性抽气操作来调节各种类型的系统运行情况。我们重新假设曝气和选择性排水，以最大限度地提高水净化性能。优化系统运行的基本思想是最大限度地减少水系统和大气环境的总环境负荷。最大化在成本效益分析中，考虑了系统建设所需的初始成本和运行成本，提出了水净化性能、成本和总环境负荷的最佳策略。最后提出了曝气系统的运行方式和选择性退出装置。另一方面，对曝气系统间歇运行进行了现场实验，综合考虑溶解度和损失，寻找性价比最佳的运行方式。的氧气通过水质测量发现间歇曝气系统的最佳运行取决于热结构的季节变化，这可以最大限度地减少能源消耗和二氧化碳的排放。作为水净化的另一种方式，营养盐。通过对天然湖泊的实地调查，研究了沿岸地区植被的吸收性能。当前研究计划的结果将为大坝水库管理提供新的方向，可用于未来几年的环境工程。河流流域的总环境负荷通过应用目前的研究成果可以将其最小化。