本研究選定台南運河(台灣台南市)作為研究對象，此處水體自淨作用較差，加上部份周邊民生廢污水排放其中，因此導致臭味問題。
本研究中，進行了感官和化學分析以研究氣味的特徵，包括使用初嗅數法(Threshold odor number, TON)分析臭味熱區(Hot spot)，使用嗅覺層次分析法(Flavor profile analysis, FPA)分析氣味特徵，以及氣相層析質譜儀(Gas chromatography and mass spectroscopy, GC/MS)與固相微萃取(Solid phase microextraction, SPME)結合的化學分析法，來進行臭味物質之定性及定量，並將其與水質條件進行比較。此外，本研究中設計批次氧化實驗，探討過氧化氫(H2O2)/二氧化鈦光觸媒/紫外線系統氧化臭味物質的可行性。
現場調查結果顯示，台南運河中各站點普遍檢測到二甲基硫(Dimethyl sulfide, DMS)及二硫化碳(Carbon Disulfide, CS2)，具有典型的含硫揮發性有機化合物(Volatile organic sulfur compounds, VOSCs)特徵及獨特的氣味，前者通常被描述為爛高麗菜或玉米罐頭，後者為化學溶劑或廚餘味。然而，FPA分析結果中此二者的氣味並不明顯，以魚腥味為此區域之主要臭味物質。
批次實驗結果顯示，UV-C/ H2O2系統對水中DMS具有高效降解效果，二氧化鈦光觸媒的貢獻則較不顯著。然而，若於台南運河原水中使用此系統，則可能導致整體臭味強度、臭味特徵改變，未來擬定整治政策或設計現場處理系統時應將此因素列入考量。

This study employs sensory and chemical analyses to explore the attributes of odor and hotspots, including the threshold odor number (TON), flavor profile analysis (FPA), and a chemical analysis method that integrates gas chromatography and mass spectrometry (GC/MS) with solid-phase microextraction (SPME). Additionally, this study incorporates batch oxidation experiments to assess the potential of a hydrogen peroxide (H2O2)/titanium dioxide (TiO2) photocatalyst/UV system for the oxidation of malodorous substances.
The findings from the site investigations reveal that dimethyl sulfide (DMS) and carbon disulfide (CS2) are frequently detected at various locations along the Tainan Canal. DMS is often likened to the smell of rotten cabbage or canned corn, while CS2 is reminiscent of chemical solvents. Nonetheless, these two smells are not strongly evident in the results of the FPA analysis, where the prevailing malodorous compound is fishy in nature.
The batch experiment outcomes demonstrate the efficacy of the UV-C/H2O2 system in efficiently degrading DMS in water, with the contribution of the TiO2 photocatalyst being comparatively less significant. If this system were to be applied to the natural water of the Tainan Canal, it could potentially induce alterations in odor intensity and characteristics. This consideration should be factored in when devising remediation strategies or conceptualizing on-site treatment systems for the future.

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