中水回收再利用已逐漸成為缺水國家節水的重要途徑之一。台灣因氣候變遷，降雨量正日漸下滑，但中水技術仍然不常使用於室內環境，近期政府正在擬定新的水價制度，必須適時作前瞻性之規劃與調整。此研究中，中水系統將家庭用水設備所排放之低汙染廢水，經由汙水基本處理四步驟 ，篩選、沉澱、過濾及消毒後優先給予沖廁及園藝使用，然而目前中水系統多為大型集體式處理和原型製作階段，並無根據使用者需求與居住空間作客製化的設計。本論文研究目的分為下列以下四點:
一、藉由中水技術文獻回顧，以住宅為使用對象，作中水系統最佳設計。
二、將兩個示範案例居住空間依據現有條件與用水需求，整合家庭內各用水設備，作客製化的中水系統配置設計。
三、根據中水系統初期投資成本、每年維修成本、營運成本、以一家五口每年平均水費、設備成本等六項作生命週期成本分析，作兩個示範案例中水系統20年生命週期成本分析。
四、根據示範案例設計成果，彙整並列出家庭中水系統之設計策略並作中水系統最佳化設計。
本研究結果為小型中水收集、回收系統設計呈現與示範案例之設計成果，彙整住宅中水系統之設計策略為：中水系統於設計時需考慮各空間乾濕特性、管線配置相對距離與設備用水量作為設計參考，以打造家庭雙供水系統進而達到節水之最終目標。此系統最低回收期為11年，但隨著技術的純熟與回收端的增加進而降低回收期，使中水系統成為未來新興替代水資源。

Grey Water Recycle System is one of the feasible technologies in which lack of water countries to overcome the water conservation. In spite of climate change and decreasing rainfall day by day, Grey Water Recycle System seldom considered about interior building spaces in Taiwan. Until recent years, due to the new public policy of increasing water bill, proactive water management should start to plan. This paper reveals a grey water collection, treatment and reuse system that was designed and implemented in an urban household. And treated grey water is used for toilet flushing and to irrigate the garden. However, products of Grey Water Recycle System now more like a giant collective type, or a small prototype which cannot satisfy user requirements and customized systems design for residential space.
The purposes of study listed below:
1. By reviewing reference and patent database, construct a small Grey Water Recycle System.
2. According to residential space and water requirements of two demonstrated cases, combined them with domestic apparatus and designed customized grey water treatment systems.
3. This paper reports a study to evaluate Life Cycle Cost (LCC) in twenty years about two types of grey water treatment systems, which includes initial invest cost, maintence and repair cost of years, operation cost, water bill ,and pump cost are considered in financial analysis.
4. Two grey water treatment systems are described in design strategies on the Grey Water Recycle System for residential building, and propose optimal design of grey water treatment system.
The study revealed that both a small grey water treatment system ,and two demonstrated systems of treating grey water. The design strategies showed that the characteristics of space, distance for domestic equipments, and water consumption are the main factors of construction for customized system. Costs of the systems and the amount of grey water treated were the main factors affecting the LCC. The payback period of this grey water treatment and reuse system is estimated to be 11 year. As a result, discovery of its payback are gradually redused with more reusing water from household and new technologies for treating grey water.

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