碩士 / 逢甲大學 / 水利工程與資源保育學系 / 103 / Environmental sanitation and river water pollution in contemporary nations are receiving increasing attention. A sewer system is a basic infrastructure in urban sewage disposal for preventing river water pollution, thus improving the living environment. Presently, the sewer system in Taiwan comprises mostly the gravity type. When the topography of the sewage collection area is uneven, has steep slopes, and has high groundwater tables, the installation of pipes becomes difficult and the installation costs involved elevates. When this occurs, a vacuum sewer system becomes a more feasible alternative.
This study analyzed the design and construction costs, operations and maintenance, and unit cost of the Ming-Te Reservoir Special District North Coast and South Coast sewer system to evaluate the advantages of gravity and vacuum sewer systems. The North Coast special district has an average gradient of 0.58% and uses a gravity sewer system as its main sewer system. The South Coast special district has uneven topography with a gradient varying between 3% and 5% and uses a vacuum sewer system as its main sewer system.
The South Coast installed vacuum sewage pipes of approximately 1600 m in total length; their system cost approximately NT$17.82 million, with an average unit cost of NT$11,300 per meter. The North Coast installed gravity sewage pipes of approximately 1700 m in total length; their system cost approximately NT$17.60 million, with an average unit cost of NT$10,400 per meter. Regarding operations and maintenance, the gravity sewer system entails more complicated inspections and repairs, with water recycling centers that are subject to monthly maintenance (although the frequency of the maintenance is relatively low). The vacuum sewer system uses a real-time monitoring device for detecting pressure loss, with operation and maintenance duties being divided into daily, weekly, monthly, and biannual tasks; the frequency of the maintenance is more intensive than for the gravity type.
The vacuum sewer system exhibited more advantages regarding function and preventive maintenance, but the gravity sewer system was more feasible regarding issues such as construction cost and operations and maintenance. Gravity sewers are suitable for most areas, such as areas with a flatter gradient and denser population. Vacuum sewers are suitable for areas with an uneven topography and a low population density.
| Identifer | oai:union.ndltd.org:TW/103FCU05398019 |
| Date | January 2015 |
| Creators | 林悅翔 |
| Contributors | 李漢鏗 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 131 |
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