Analysis of Water Quality and Purification Process Improvement for Urban Water Supply in North-Eastern China

学生名:王 晓东

研究テーマ:Analysis of Water Quality and Purification Process Improvement for Urban Water Supply in North-Eastern China

(中国東北地区の都市における水供給のための水質分析と浄化プロセスの改善に関する研究)

入学年月:2017.10

修了年月:2021.03

取得学位:博士（工学）

論文概要:
With the continuous development of urbanization, the problem of urban water supply security in China is becoming more and more serious, even seriously affecting people's normal life. Urban water supply is an important part of urban infrastructure. It is not only the basis of urban formation, but also the basic condition to ensure the stability, development and prosperity of the city, and is inseparable from the various elements of urban economic development. Therefore, it is necessary to analyze the water quality and the distribution of pollutant sources in the water sources around the city, and put forward an effective scheme to meet the local urban development and ensure the safety of water supply. Harbin is an important city in northeast of China. Since the occurrence of the nitrobenzene pollution incident in Songhuajiang River in 2005, the water supply in its main urban area has been limited. With the development of urban economy and the continuous expansion of people's demand, the single and long-distance water supply source can not meet the urban planning requirements of Harbin. Therefore, in order to ensure the city's economic development and water supply safety, the water quality of Mopanshan Reservoir and Songhuajiang River, which are two kinds of water sources around Harbin, are analyzed comprehensively and the pollution sources are also analyzed. It is an important content of urban planning to put forward a solution.
In this paper, we compared and analyzed the water quality of Mopanshan Reservoir water and Songhuajiang River water from 2016 to 2018 based on the “Environmental Quality Standards for Surface Water” (GB3838-2002) and “Standards for drinking water quality” (GB5749-2006), so as to comprehensively understand the water quality of the two water sources in Harbin in recent years. At the same time, the characteristic pollutants of the two water sources were determined, and the distribution of the pollution sources was analyzed. The quality of the effluent after the treatment of the conventional water purification process (coagulation sedimentation filtration disinfection) of the two water sources was compared, so as to provide the basis for the subsequent response plan. In addition, based on the conventional water purification process, the operation parameters of enhanced conventional process (enhanced coagulation and enhanced filtration) and advanced water purification process mainly based on ozone-biological activated carbon (O3-BAC) were studied through a large number of pilot scale experiments, taking Songhuajiang River water as raw water. And based on the characteristics of water quality pollution, a suitable water purification process method was proposed. Meanwhile, the water quality of joint water supply of two water sources was also preliminarily studied. This paper proposes an emergency plan for the emergency situation of water use in Harbin. In addition, we also made a preliminary engineering economic analysis on the proposed deep water purification process based on the O3-BAC process.
The thesis consists of eight chapters and the summary of each chapter is shown as follows.
In the chapter 1, background, previous research, purposes, and configuration of the thesis are described.
In the chapter 2, the involved theories, material, research method, and process overview are presented.
In the chapter 3, we compared the water quality between the Mopanshan Reservoir and Songhuajiang River and applied WQI method to evaluate the water quality of the two drinking water sources.
In the chapter 4, the characteristic pollutants and pollution sources of the two drinking water sources are analyzed. Meanwhile, the finished water quality of the two drinking water sources are also carried out.
In the chapter 5, the enhanced conventional process in a waterworks of Harbin was researched.
In the chapter 6, we studied the advanced treatment in a waterworks of Harbin and analyzed the operating parameter of each treatment unit.
In the chapter 7, the engineering economic of the O3/BAC process was analyzed.
In the chapter 8, the results of the thesis are summarized.