隨著科技的進步和生活水平的提升，公眾對飲用水質量的要求日益提高。聯合國在2016年公佈的17項可持續發展目標（Sustainable Development Goals, SDGs）中，明確指出水和衛生（Water and Sanitation）是未來主要發展和關注的重點。然而，由於工業和生活污水的排放，水體中經常出現惡臭問題，這導致民眾對飲用水及環境水體的信心逐漸減少。
為探討飲用水源及天然水體中異臭味的問題，本研究建立環境水中兩類常見臭味物質之定量方法，並進一步利用臭氧處理對其去除效果。研究中首先選定目標物質包括揮發性含硫化合物(VOSCs)(二甲基硫(DMS)、二甲基二硫(DMDS)、二甲基三硫(DMTS)及二硫化碳(CS2))、及工業化學品(丙二醇甲醚乙酸酯(PGMEA)和2,6-二丁基對甲酚(BHT))。透過氣相層析質譜儀(GC/MSD)搭配固相微萃取(SPME)結合建立臭味物質定性及定量的方法，同時利用感官評價法以研究水中氣味特徵，包括使用強制選擇嗅覺閾值分析法(FCM)找出目標物質之嗅覺閾值，並使用初嗅數法(TON)及嗅覺層次分析法(FPA)分析水樣中臭味的強度及特徵，同時從儀器及人體角度，主客觀探討及評估異臭味問題。
本研究採樣區域包含臺南運河、鹽水月津港、路竹淨水廠和草屯鳥嘴潭。採樣分析結果顯示，DMS及CS2為出現頻率最高之物質，DMDS及DMTS則是於6月的臺南運河採樣時有檢測到，BHT則是有在少部分水樣中發現。其中濃度有超過該物質之嗅覺閾值的有DMS及DMTS(描述為腐爛蔬菜味)。然而FPA分析結果顯示在DMS及DMTS濃度超過其嗅覺閾值的樣品中，只有路竹淨水廠混凝池及沉澱池樣品的主要味道認定為腐爛蔬菜味。
批次實驗結果顯示，臭氧具有降解水中DMS的效果，然而，若於臺南運河原水中使用臭氧進行處理會導致整體臭味強度及臭味特徵的改變，且降解效率會根據有效接觸因子(f_v)而改變，可作為提供反應槽設計參考的重要參數。

This study investigates two common odor compounds in environmental water and evaluates the effectiveness of ozone treatment in removing these compounds. The target compounds include volatile organic sulfur compounds (VOSCs) such as dimethyl sulfide (DMS), dimethyl disulfide (DMDS), dimethyl trisulfide (DMTS), carbon disulfide (CS2), as well as industrial chemicals like propylene glycol monomethyl ether acetate (PGMEA) and 2, 6-ditert-butyl-4-methylphenol (BHT). Analytical methods combining gas chromatography-mass spectrometry (GC/MSD) and solid-phase microextraction (SPME) were developed to quantify these compounds. Additionally, sensory evaluation methods, including forced-choice odor threshold determination and flavor profile analysis (FPA), were used to assess odor characteristics in water samples.
The sampling analysis results show that DMS and CS2 were the most frequently detected substances in the studied water bodies, while DMDS and DMTS were detected during the June sampling of the Tainan Canal, and BHT was found in a few water samples. Among these, DMS and DMTS had concentrations that exceeded their respective odor thresholds (described as having a rotten vegetable smell). However, the FPA analysis results indicated that among the samples where DMS and DMTS concentrations exceeded their odor thresholds, only the samples from the coagulation and sedimentation processes at the Luzhu Water Treatment Plant were primarily identified as having a rotten vegetable odor. In addition, ozone was found to effectively degrades DMS, but treatment can alter the overall odor intensity and characteristics in water, with efficiency varying based on contact factors.

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