Study on the Introduction of Waste Water Tratment Plant for the Improvement of Water Quality in the Poorly Drained Agricultural Area lying in the Lower Reaches of the Kiso River Basin

该研究项目覆盖了通常被称为努比平原的地区。然而，这项研究主要涉及低洼地区，这些地区主要由Kiso、Nagara和Ibi河的冲积土壤的沉积沉积物组成。居住和工业活动侵入这些低洼地区造成了水质问题。本研究的目的是研究在该地区下流域引进污水处理厂的效果，以解决这些水质问题。为了本研究的目的，我们选择了高须圩田作为具体的项目区。从该地区的不同地点收集了一些数据进行研究和分析。发现平田镇周围的污染物负荷非常高。然而，平田镇正在建设的四个污水处理厂预计需要四年多才能完成，以解决这个问题。研究表明，在所覆盖的许多处理厂中，只有少数几个达到了合理的标准水平。但是，必须指出的是，如果管理这些工厂的工作人员和公司的管理能力得到提高，并且工厂保持不间断运行，所有这些工厂都可以生产高质量的废水。

The research project covers the area normally referred to as the Noubi Plain. However, the research is mainly concerned with the low-lying lands which comprise mostly of sedimentation deposits of alluvium soils of the Kiso, Nagara and Ibi rivers.The intrusion of residential and industrial activities into these low-lying areas have created water quality problems.The objection of this research is to study the effect of the introduction of a waste water treatment plant in the lower basin of this area in order to solve these water quality problems.For the purpose of this research the Takasu Polder was selected as the specific project area.Several data were colected from different locations within this area for study and analysis. The pollutant load around Hirata Town was found to be very high. However, four waste water treatment plants under construction in Hirata Town to tackle this problem are expected to take more than four years to complete.The studies showed that out of ever many treatment plants covered only a few performed to a reasonable level of standard. However, it is important to note that all these plants can produce high quality effluent if the management competence of the staffs and companies in charge of these plants are improved, and the plants are kept running continuously without stoppages.