碩士 / 國立成功大學 / 環境工程學系碩博士班 / 90 / Wastewater treatment plant and ocean outfall pipe are usually used to be the final disposal facilities on the coastal cities. In the past, both wastewater treatment plants and ocean outfalls are frequently designed as two separate systems with respect to individual system demand and limitation. However, it may not economical. In this study, both coastal wastewater treatment plant and ocean outfall pipes were integrated as one system and an optimization model was formulated to seek the optimal planning strategy for improving the cost-effectiveness of engineering program. In the first stage, CORMIX (Cornell Mixing Zone Expert System) simulation model was selected as a simulation tool to simulate the initial dilution behavior of discharged wastewater from outfall port since it can be applied to most types of multiport diffuser and ambient conditions. Besides, a hydraulic modeling practice was employed to validate the simulation results. In the second stage, an optimization model was developed to finding the optimal design parameters. The planning objective considered in this analysis is to minimize the total expansion cost. The constraint set contains the limitations of water quality and engineering design requirements. Furthermore, this study introduced the chance-constrained programming to consider the impact of optimal scheme due to the system uncertainty. Chou-Qu wastewater treatment and outfall system was selected as a typical case study site. Research findings indicate that the original alternative proposed by the Kaohsiung municipality, which tried to promote the wastewater treatment facilities from the primary to the secondary level, was found economically undesirable. The most cost-effective strategy gained in this study suggests that the optimal length of the second ocean outfall pipe to be expanded should be no less than 1,260 meters. With applying the primary and enhanced primary treatment technologies, the Class B and Class A BOD effluent standards can be confirmed, respectively. Similar results would appear when taking into consideration the stochastic characteristics of sewerage inflow. Based on such suggestions, it would save over 75% of the total investments when compared to the current official option.
| Identifer | oai:union.ndltd.org:TW/090NCKU5515022 |
| Date | January 2002 |
| Creators | Chin-Hsien Chang, 張進賢 |
| Contributors | Ni-Bin Chang, Shin-Cheng Yeh, 張乃斌, 葉欣誠 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 178 |
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