近年來，國內外的許多濱海城市已陸續興建污水處理廠與海洋放流管作為污水最終處置的設施。傳統上，污水處理廠與海洋放流管常依照各自的系統需求與限制而分別規劃、設計，使得整個污水海洋放流系統可能無法發揮最大的經濟效益。有鑑於此，本研究整合了海岸污水處理廠及海洋放流管兩子系統，並以經濟效益為考量點而建立該整合系統之優化模式，以進行工程優化分析，研擬較佳之設計方案。

在建立優化模式的過程中，首先，本研究選用CORMIX(Cornell Mixing Zone Expert System)作為本研究模擬海洋污染擴散行為之工具，改善了以往許多數學模式僅能模擬少數的海放管設計案例與海洋環境條件的情形，也提高了模擬精度。之後，則以水力模型實驗(Hydraulic Modeling Practice)探討CORMIX是否適用於本研究區域之海洋污染擴散情形。在確認CORMIX適用於本研究區域後，CORMIX則用於模擬系統所需之海洋放流污水稀釋資訊，並將模擬結果整理成線性迴歸式以便於引入該優化模式中，解決了前人研究中因所建立之優化模式含有許多數學方程式而引發的非線性問題，此舉不但降低了優化模式求解的困難度，也提高了優化解的可靠度。最後，本研究以整合系統的觀點考量法規限制、系統設計限制及污水廠與海洋放流管之建造成本等因素，配合引用上述之線性迴歸式而建立該整合系統之優化模式。此外，為了降地系統中的不確定性(Uncertainty)對優化方案的衝擊，本研究也引用機率限制規劃(Chance- Constrained Programming, CCP)探討系統在多種不確定情境下之最適規劃方案。

我國已先後於台北縣興建八里海放管，於高雄市興建中區、大林蒲與左營海放管，近年來隨著污水量逐漸增加，政府已開始著手污水處理廠與海洋放流管之擴建規劃。在本研究中，以高雄市中區污水處理廠與海洋放流管之擴建規劃為研究案例，針對該案例進行工程優化分析以探討中區污水廠與海洋放流管之優化擴建方案。在本研究所建立的定率優化模式，及具機率限制式之優化模式(流量累積超越機率為75%以下)的解都顯示出，在符合甲、乙級放流水標準時，中區污水處理廠的經濟擴建方案分別為強化初級處理與初級處理，另外也得知擴建海放管之管長應大於為1,260公尺，所需經費也在政府編列原先規劃方案預算的25%以下。

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.

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