The Mechanism, Characteristics, and Efficiency of a New Vertical Flow Labyrinth (VFL) Device for Treating Various Wastewaters

学生名:王 晓轩

研究テーマ:The Mechanism, Characteristics, and Efficiency of a New Vertical Flow Labyrinth (VFL) Device for Treating Various Wastewaters

(新垂直流ラビリンス（VFL）排水処理装置の機構、特性及び効率に関する研究)

入学年月:2018.04

修了年月:2022.09

取得学位:博士（工学）

論文概要: Due to high ammonia nitrogen and complex water quality characteristics, landfill leachate has caused significant difficulties in leachate's biological treatment. Therefore, it is essential to develop an efficient and energy-saving leachate natural treatment process. In addition, printing and dyeing wastewater is one of the leading industrial wastewaters with large output, strong alkalinity, high chroma, high organic concentration, complex components, and poor biodegradability. The textile industry is one of the most intensive industries in chemical products whose wastewater contains hazardous dyes, pigments, dissolved/suspended solids, and heavy metals. Hence, it is essential to effectively treat the wastewater generated by those industries before releasing wastewater into the environment. Though textile wastewater treatment has made tremendous progress, the advanced treatment methods should be improved further to make them economically viable and friendly. Based on this, starting from landfill leachate and sand washing wastewater, this paper uses a new vertical flow labyrinth (VFL) device to investigate the effect of seasonal temperature on water quality degradation performance. On this basis, the superiority of the VFL unit and the anaerobic/anoxic/aerobic (AAO) process in the treatment of sand-washing wastewater was compared.
Chapter 1 is the research background and purpose of the study.
Chapter 2 is the review of previous literature. The research on talents attraction strategies of different countries, regions, and cities has been investigated. It is notable that there are still some research gaps which need to be studied.
Chapter 3 is the research methodology. The designing process and the experimental process of the conjoint analysis has been shown in this chapter.
Chapter 4 is to analyze the microbial community structure of the sludge samples in the anaerobic, anoxic, and aerobic sections of the long-running VFL unit for the treatment of landfill leachate of by metagenomic sequencing technology.
Chapter 5 is to analyze printing and dyeing wastewater treatment by anaerobic reactor, VFL, and AAO.
Chapter 6 is to analyze the Simpson index of each stage of the VFL device which is smaller than that of the AAO process.
Chapter 7 is to introduce the VFL application in Jilin Province of China.
Chapter 8 is a selection analysis of VFL as a sewage treatment technology in green buildings’ application.
Chapter 9 is the conclusion and policy implication.