運用低耗能可見光催化模組降解SVE尾氣之研究

Study on Degradation of SVE Exhaust Gas by Low Energy Visible-Light Photocatalytic Module

楊宗翰(Tsung-Han Yang)

指導教授 ： 游勝傑 ； 王雅玢

中原大學/工學院/環境工程學系/碩士(2019年)

https://doi.org/10.6840/cycu201900785

摘要

當土壤受到油氣污染時多以土壤氣體抽除法進行整治，該法為防止污染氣體直接排放進入大氣環境，抽出之氣體將經由管線至尾氣處理設備，並經過活性炭處理後排放，因此本研究擬建置吸附模組對光催化模組進行輔助，透過將2模組結合成為光催化商業模組以增強光催化模組之去除效率及使用壽命，本研究將透過吸附模組內部流場分析、改變吸附模組內部載體數目、活性碳置入量及污染物流量對吸附模組進行測試，並以測試結果建立最佳使用參數，接著進行光催化商業模組最佳使用參數測試，透過環境濕度、污染物流量及長效試驗進行測試，以確定其最佳使用參數及穩定性，最終將進行實際污染場址測試及成本分析。
本研究透過ANSYS有限元素分析軟體針對模組內部流場進行分析，其分析結果顯示不具整流板之吸附模組內部產生短流現象，故本研究設計一具整流板之吸附模組，透過各項參數測試，該模組之最佳活性碳使用量為30g/層，且該模組於足夠之污染物停留時間及活性碳飽和吸附能力範圍內時，改變氣體流量對甲苯的去除效率並不會造成太大影響，去除效率差異小於1%，而光催化商業模組之測試結果顯示，該模組於不同環境濕度下時，以環境濕度<4RH%有高於95%之去除效果，且如同吸附模組一般，光催化商業模組於足夠之污染物停留時間及活性碳飽和吸附能力範圍內時，改變氣體流量對甲苯的去除效率並不會造成太大影響，去除效率皆可高於95%，並可維持該去除率長達3日以上，以此實驗參數及去除效率進行計算，本研究所建置之光催化商業模組去除1kg甲苯所需成本為11,031.4元。

關鍵字

土壤氣體抽除法 ； ANSYS ； 二氧化鈦 ； 光催化 ； 甲苯

並列摘要

The soil polluted by oil is usually treated by the method of soil vapor extraction. The extracted gas is discharged through the pipeline to the exhaust gas treatment equipment and treated by activated carbon to prevent the polluted gas directly released into the atmosphere. The purpose of this study is to build an adsorption module to assist the photocatalytic module. In order to enhance the removal efficiency and life span of the photocatalytic module, this study combined two modules into a photocatalytic commercial module. This study tests the adsorption module through the internal flow field analysis, carrier amount, activated carbon dosage and the flow rate of pollutants to optimize the module parameters. The optimization of photocatalytic commercial module was also investigated by the experimental parameters such as ambient humidity, pollutant flow rate, and long-term tests to determine the optimum parameters and confirm the stability. Finally, this study performed the existing contaminated site test and cost analysis for the future application.
This study analyzes the internal flow field of the module through the ANSYS finite element analysis system. The results show that the short-circuiting phenomenon has occurred in the adsorption module without the rectifying plate. Therefore, this study designed a rectifying plate inside the adsorption module to improve the efficiency. According to the results of various parameter tests, the optimized activated carbon dosage is 30g per layer. The difference of toluene removal efficiency by the various gas flow is only less than 1% when the module is within the range of sufficient residence time and saturation of adsorption capacity of activated carbon. The results of the photocatalytic commercial module depict that the removal efficiency of module is higher than 95% at ambient humidity <4RH%. As the adsorption module, when the photocatalytic module in the proper condition of residence time and adsorption capacity, there are only a few effects on the removal efficiency of toluene when changing the gas flow rate, and the removal efficiency could be higher than 95% and maintained more than 3 days. Based on the experimental parameters and removal efficiency, the cost for removal of 1kg toluene from the photocatalytic commercial module is about 11,031.4 NT. dollars.

並列關鍵字

Soil Vapor Extraction,SVE ； ANSYS ； TiO2 ； Photocatalytic ； Toluene

參考文獻

[1] 土壤及地下水污染整治基金管理會. (2005). 94年整治年報. 行政院環境保護署.

[2] Devahasdin, S., Fan, C., Li, K., & Chen, D. H. (2003). TiO2 photocatalytic oxidation of nitric oxide: transient behavior and reaction kinetics. Journal of Photochemistry and Photobiology A: Chemistry, 156(1), 161-170.

[3] Kawar, K. H., & Underhill, D. W. (1999). Effect of Relative Humidity on the Adsorption of Selected Water-Miscible Organic Vapors by Activated Carbon. American Industrial Hygiene Association Journal, 60(6), 730-736.

[4] 魏仁傑. (2018). 製備鑭摻雜二氧化鈦光催化劑降解土壤氣提法尾氣-甲苯之研究. 中原大學環境工程研究所學位論文.

[5] 林威州. 土壤氣體抽除法(Soil Vapor Extraction)整治技術探討.