學校作為都市聚落中最核心的公共設施，而都市社區水資源的循環利用是重要的課題，考量生活污水當中含有大量有機物質，生化需氧量乃為最重要的水質指標之一，本研究旨在探討校園內，應用既有水體進行自然淨化之成效，以供日後污水就地處理之參考基礎。 本研究係於校園生態池實場進行實驗，污水來源為校園建物化糞池，利用生態池池水及水生植物作為自然淨化之裝置，檢測本土校園污水淨化效能數據；以不同污水注入量為自變項，生化需氧量之削減速率為依變項，利用統計方法進行分析。實驗結果指出兩者之相關性達顯著水準，且處理結果遠較國外相關研究為佳。以所得數據進行BOD削減量推估，面積100平方公尺之校園生態池，可在3日內將1000至4000人所產生之生活污水處理至符合放流水標準，對於校園水資源循環利用及環境教育均具有正面的效果，未來應針對校園規劃設計之具體應用進行研究，並嘗試提升其處理效率。

The purpose of this study is to ensure the treatment efficiency of natural purification. In recent year, studies of ecological function in landscape have focused on the pollutants reducing rate. It has been reported that aquatic plants are helpful but the real mechanisms are unknown. This paper discusses the organic waste matter in the water, and limits the discussion to biochemical oxygen demand (BOD). Experiments are carried out in the campus ecological pond. BOD₅ in different installations were measured continuously. The statistic method is applied to analysis the data. Results clearly show that reducing rate is in relation to the wastewater loading. In 15% loading, the reaction rate constant is 0.558(day¯¹); in 100% loading is 4.955(day¯¹). The treatment efficiency in this experiment is better than it in other countries. Temperature might be the reason to speed up the reaction.