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Study on the influence of treated wastewater upon the water quality of Lake Togou.

废水处理后对东乡湖水质的影响研究

基本信息

批准号：
62560233
负责人：
YOSHIDA Isao
金额：
$ 1.54万
依托单位：
Tottori 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：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

项目摘要

Togou Twon at situated about 30 km west of Tottori city in Tottori Prefecture determined to protect Lake Togou from water contamination and to built the sewage treatment plants which purify the wastewater from rural areas. The town authority has already constructed four plants.The results are described as follows.First, with respect to organic contamination indices BOD and COD, both plants of Miyauti and Hanami purified the influent of BOD 100-150 ppm into the effluent of 15-20 ppm, which meet the criteria of under 20 ppm. In COD respect, Hanami and Miyauti plants gave the effluents of about 20 ppm and about 10 ppm throughout the year respectively. Then, we can say that both plants show the good performance on removal of organic matter.Second, the influence of effluents upon the river water are described. Comparing the river water at lower point with that at upper point of river where the treated water is discharged into, we find out that the difference of water quality at both points is very samll. Then we can say that the influence of effluents is little.Third with regard to total nitrogen, both plants gave the effluents of about. 20 ppm which meet the criteria of under 20 ppm. The denitrification is higher in Summer and lower in Winter. Comparing the total nitrogen at lower point with that 4t upper point the difference is also as small as COD and BOD. The same result is true of tatal phosphorus.Finally, we can say that both plants are very useful to purify wastewater and to protect The lake, Lake Tozou is said to be a closed water territory. We need to make more efforts for future to protect and to improve the water quality of Lake Togou.

Togou Twon位于鸟取县鸟取市以西约30公里处，决定保护Togou湖免受水污染，并建造污水处理厂，以净化农村地区的废水。市政当局已经建造了四座工厂。结果如下：首先，在有机污染指标BOD和COD方面，Miyauti厂和Hanami厂均将BOD 100- 150ppm的进水净化为15- 20ppm的出水，符合20ppm以下的标准。在COD方面，花美厂和宫地厂全年出水分别约为20ppm和10ppm。因此，我们可以说两种植物在去除有机物方面都表现出良好的性能。其次，描述了污水对河水的影响。将处理后的水排入河流的上游点与下游点的水质进行比较，发现两者的水质差异很小。那么我们可以说，污水的影响是很小的。第三，在总氮方面，两家工厂都提供了大约。20 PPM，符合低于20 PPM的标准。反硝化作用夏季较高，冬季较低。较低点总氮量与较高点总氮量的差异与COD和BOD的差异一样小。同样的结果也适用于全磷。最后，我们可以说这两种植物对净化废水和保护湖泊都非常有用，据说托邹湖是一个封闭的水域。为了保护和改善东沟湖的水质，我们需要做出更多的努力。