Investigation on Maintenance for Water Treatment System and its Processing Indicators in Kitakyushu Science and Research Park

学生名：李威祎

研究テーマ：Investigation on Maintenance for Water Treatment System and its Processing Indicators in Kitakyushu Science and Research Park

入学年月:2018.04

修了年月:2020.03

取得学位:修士（工学）

論文概要:Water resources have been vital for both nature and humans since ancient times. However, with increasing populations, industrialization, and agricultural activities, combined with climate change, water quality deterioration has become a global concern. Continuous discharge of industrial wastewater and domestic sewage has led to significant water pollution, making available water scarcer and threatening urban and social development. To address this issue, wastewater treatment systems play a critical role in purifying and reusing water, protecting the environment, and mitigating water scarcity.

This study investigates the water treatment system at Kitakyushu Science and Research Park (KSRP), focusing on three sections: sewage treatment, rainwater treatment, and experimental wastewater treatment systems. Since the sewage and rainwater treatment systems share many devices, they are analyzed as one integrated system. The research emphasizes two key aspects: maintenance strategies and processing indicators of treated water. Data were collected from the Energy Center and IT Center at KSRP.

First, the study provides an overview of the three sections of the water treatment system. It employs the Failure Modes and Effects Analysis (FMEA) method to identify high-risk faulty components and assess the failure rates of the system. Maintenance records were analyzed to evaluate the system’s current operational and maintenance status. Secondly, the processing indicators were examined, focusing on two types of maintenance: periodic inspections and maintenance triggered by substandard treated water quality, as identified through monthly water quality tests.

The analysis revealed critical components responsible for substandard water treatment and those that reduce processing efficiency, causing indicators to approach unacceptable values. Based on these findings, the study proposes optimized maintenance strategies to enhance system performance, reduce downtime, and save costs. Regular inspections, timely repairs, and effective water quality monitoring were found to be essential for ensuring operational efficiency and maintaining safety.

This research underscores the importance of efficient water treatment systems in addressing water scarcity and environmental protection. By optimizing maintenance strategies through data-driven approaches such as FMEA, water treatment systems can achieve higher reliability and cost-effectiveness.