廚餘堆肥場最主要之問題為臭味之去除，一般傳統的臭味去除的方法有吸收劑吸附法、化學洗滌法、焚化/觸媒焚化法、生物濾床法等。光催化為目前處理揮發性有機物的技術中較新穎的處理技術，具有吸引、非選擇性及室溫下可進行光催化分解有機物等特性，為具發展潛力的最終處理程序。
本研究主要目的在利用自製TiO2光觸媒處理廚餘堆肥場中臭味氣體三甲基胺，探討反應系統中，滯留時間、氧氣含量、溫度變化及反應物初始濃度對臭味氣體三甲基胺反應之去除率影響，並添加Sr、Cu對自製TiO2光觸媒進行改質，探討改質TiO2光觸媒對三甲基胺反應之去除率影響。並藉由各種輔助實驗中，如SEM、XRD等多項精密儀器來觀察研究光觸媒之各項物化性質。本實驗採用連續式環狀薄膜反應器，而自製TiO2光觸媒及改質TiO2光觸媒是利用溶膠凝膠法製備而成，實驗研究結果證實本研究所採用製備之光觸媒方式，可有效處理臭味氣體三甲基胺。
實驗結果顯示，由XRD分析得知，鍛燒溫度為773 K時自製TiO2光觸媒晶相大部份為anatase，另有一些rutile之晶相產生。
改質後之TiO2光觸媒處理三甲基胺之轉化率分析中可發現，在停留時間10 sec時，Sr/Ti=0.1%的改質TiO2光觸媒表現最佳，其轉化率為57%，而自製純TiO2光觸媒，轉化率為43%。在波長480~580 nm的可見光照射12小時後，包含三甲基胺本身可能受到的光解反應， Sr/Ti=0.1 mole%的改質TiO2光觸媒對臭味氣體三甲基胺有達到最佳的轉化率約有57%。

The important subject of food waste composting plant is the odor degradation. The traditional techniques are adsorption, chemical scrubbing, incineration/ catalytic incineration and bio-filter. Photocatalytic degradation has drawn considerable academic interest as a very attractive, non-selective room-temperature process for the degradation of organic pollutants.
We will synthesize photocatalyst (TiO2, Sr/ TiO2 and Cu/ TiO2) to use for photocatalytic degradation of C3H9N produced from. It can be classified into three major parts: (1) the effect of synthesizing photocatalyst by prepared different methods. (2) The effects of operating factors such as light intensiy, VOC concentration, space velocity, O2 concentration and water vapor, on the performance of the catalyst will be investigated. We will modify photocatalyst by adding some metal substances. Some instruments such as SEM、XRD、ESCA will be used to exam the catalysts.
This investigation used a tube deposited TiO2 thin flim inside. All photocatalysts was made by the sol-gel method. The experiment result indicate that the TiO2 with sol-gel method is useful for photocatalytic degradation of C3H9N.
In the XRD pattern, the crystalline phases of the TiO2 photocatalyst prepared by calcining at 773 K for 3 hours are primarily composed of anatase and minor amount of rutile.
When retention time is controlled at 10 seconds, the best trimethylamine photodegration performance is the sample of Sr/Ti=0.1 mole%. The performance is 57%. The following are Cu/Ti=0.0001 mole%. The performance is 49%.
The irradiation intensity of visible light is 480~580 nm. The results show that with illumination for 12 h, the photodegradation efficiencies of the Sr/Ti=0.1% TiO2 by the sol-gel method is 57%.

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