| Summary: | 碩士 === 南華大學 === 科技學院永續綠色科技碩士學位學程 === 107 === Water quality in the reservoir of Mazu area is poor due to the large evaporation, favorable nutrition and salinization. From the end of 2010, the desalination plant in Nanxun started operation to produce water 950 ton per day. In 2018, fresh water supplied by desalination plant is 70%, and lake 30%, respectively. This study adopted the cost-benefit method to evaluate the proposed seawater desalination system in Mazu area. The cost includes installation cost and operation cost. The installation cost is mainly based on seawater desalination pretreatment equipment. The benefit is the multiplation of production water volume and unit price. The operation cost includes the filter material consumption, maintenance fee and electricity fee in 2017 and 2018. Seasonal difference factor is also discussed. Data of two different seawater desalination systems were collected. One is the combination of ultrafiltration (UF) pretreatment and the plunger high pressure pump (PHP) Reverse Osmosis (RO) system. Another one is the combination of sand filter (SF) pretreatment and centrifugal high pressure pump (CHP) RO system. After analyzing the construction and operation costs, production unit price of UF&PHP is NTD. 22.16 per ton, and SF&CHP = NTD. 29.19, respectively. UF&PHP is better than SF&CHP in performance.
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