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IMPROVEMENT OF DRINKING WATER QUALITY THROUGH THE OPTIMIZATION OF RAPID-MIX CONDITIONS IN COLD REGIONS

寒冷地区通过优化快速混合条件改善饮用水质量

基本信息

批准号：
17560481
负责人：
EBIE Kunio
金额：
$ 2.18万
依托单位：
KITAMI INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

(1) From the dynamic coagulation experiment, it was made clear that an agglomeration process after a coagulant injection comprises the following three stages, that is, the preparation, the progression and the stabilization, and the number of un-agglomeration particles in the stabilization stage was greatly influenced by coagulant injection rate, and both rapid agitation and slow speed agitation.(2) Strengthening of both the rapid agitation and the slow speed agitation, even if either case is done, are effective for the improvement of treated water quality. In addition, total G.T value which minimizes treated water turbidity and STR differs from one coagulant to another, and in case of the PAC use, total G.T values necessary for achieving treated water turbidity lower than 0.5 mg/L and STR smaller than 2, are 160000〜300000.(3) With the water temperature lowering, the time until the stabilization stage appeared was lengthened, and the number of remaining un-agglomeration particles in the … More stage increased. The reason of retarding the appearance of stabilization stage is because the preparation stage was prolonged. However, there is no significant change in the length of the progression stage. The reason of the residual particle number increasing in the stabilization stage is therefore because the agglomeration speed lowers in the progression stage. Adoption of high total G.T value was considerably effective in reducing the number of residual particles.(4) How to utilize the non-ionic polymer for enhancing the treatability of turbidity and STR when water temperature was reduced was examined. As a result, the effectiveness of the rapid agitation method of serial two steps (the first step : PAC injection, and the second step: non-ionic polymer injection) was verified.(5) From experiments on the removal of humic substances which are of special concern in cold regions, the following were clarified : that the sufficient rapid agitation until it comes in the agglomeration stabilization stage is the most important and that the combined use of optimization of GR value and PAC injection rate is effective for lowering both STR and color degree. Less

(1)通过动态混凝实验可知，混凝剂注入后的团聚过程包括制备、发展和稳定三个阶段，稳定阶段未团聚颗粒数量受混凝剂注入速度、快速搅拌和慢速搅拌的影响较大。(2)加强快搅拌和慢搅拌，无论哪一种都能有效改善处理后水质。此外，使处理后的水浊度和STR最小的总G.T值因混凝剂而异，在使用PAC的情况下，使处理后的水浊度低于0.5 mg/L， STR小于2所需的总G.T值为160000 ~ 300000。(3)随着水温的降低，稳定阶段出现的时间延长，未团聚颗粒数量增加。稳定阶段出现延迟的原因是制备阶段延长。然而，进展阶段的长度没有明显变化。因此，稳定阶段残余颗粒数增加的原因是在分级阶段团聚速度降低。采用高总G.T值对减少残余颗粒数量有显著效果。(4)研究了在降低水温的情况下，如何利用非离子型聚合物提高浊度和STR的处理能力。验证了连续两步快速搅拌法（第一步：PAC注射，第二步：非离子型聚合物注射）的有效性。(5)通过对寒冷地区特别关注的腐殖质物质的去除实验，明确了充分快速搅拌直至进入团聚稳定阶段是最重要的，优化GR值和PAC注入速度结合使用对降低STR和显色度都是有效的。少