本研究評估藉由雨水收集系統收集雨水後之水質分析及相關探討。研究自2010九月份至2011年六月份，分別由台灣科技大學研揚大樓 (30組)及工程二館頂樓的小型雨水收集系統(自行設計)取得，總計62組樣品。分析雨水水質項目包含酸鹼值、電導度、鹼度、溶解性有機碳、水中14種金屬元素分析(鋁、鈣、鉀、鎂、鈉、銅、鐵、錳、釩、鋅、鎘、鉻、鉛及鎳)及3種陰離子(氯、硫酸根及硝酸根離子)，利用多管發酵法及聚合酶鏈鎖反應偵測總大腸菌群；此外，利用高量空氣採樣器收集空氣中的懸浮微粒，溶解至純水中後再分析水質。

實驗結果顯示研揚大樓雨水酸鹼值偏中性且鹼度較高而小型雨水收集系統偏酸性且鹼度低。另外，在二個收集系統中觀察到除了鈉、鈣、鉀及鎂元素之外其他10種金屬元素相對濃度較低;部分樣品中鉛及鎘濃度超過台灣飲用水水源標準。由空氣懸浮微粒中發現微量金屬元素、陰離子和溶解性有機碳存在，這些物質在大氣中與長程傳輸和交通工具的廢氣排放相關，會隨著乾、溼沉降至系統表面。在14天長期儲存後發現雨水酸鹼值略上升，電導度、濁度和溶解性有機碳下降，金屬和陰離子濃度穩定並無明顯上升或下降，而總大腸菌群在儲存初期有增加後期則減少的趨勢。在消毒方面，高濃度臭氧殺菌效果達95 %。

Total of 62 rainwater samples were collected from two rainwater harvesting systems (RWHSs) in a campus in northern Taiwan between September 2010 and June 2011. Harvested rainwater was analyzed, including pH, electrical conductivity (EC), turbidity, alkalinity, dissolved organic carbon (DOC), concentration of 14 metals (Al, Ca, K, Mg, Na, Cu, Fe, Mn, V, Zn, Cd, Cr, Pb and Ni) and concentration of 3 anions (Cl-, SO42- and NO3-). In addition, multiple-tube fermentation and conventional polymerase chain reaction (PCR) were included for detection of total coliforms (TC). During antecedent dry days, total suspended particle (TSP) were collected by high-volume sampler and dissolved in the pure water then routine analysis for the same parameters as harvested rainwater samples.

Results of harvested rainwater showed that TR Building RWHS samples had pH in neutral range and high alkalinity content, whereas pilot-scale RWHS in E2 Building possessed acidic pH and low buffer ability. Based on median value of the concentration of 14 metals from two RWHSs, harvested rainwater samples were low in metals concentration except for Na, Ca, K and Mg. Several harvested rainwater samples from both RWHSs exceeded recommended values for Pb and Cd in Taiwan. Results of TSP sample demonstrated that some trace metals, anions and DOC were probably from the long-range transport and local traffic emissions that deposited on the catchment surface. Results of effect of long-term storage showed that pH increased, while EC, turbidity and DOC slightly decreased. Concentration of anions and metals were stable. TC counts of harvested rainwater increased in the beginning then declined with long-term storage. In terms of disinfection, higher concentration of O3 had the best performance with 95 % efficiency of inactivation.

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