電泳沉積濾片應用於冷卻水塔藻化抑制之效益

空調冷卻水塔所滋生的藻菌類，容易阻塞過濾器以及使冷凝器表面上結垢，影響熱交換率而增加耗能。傳統處理採取加藥滅藻，但化學藥劑隨著冷卻水排放，將對環境造成影響。 TiO2光觸媒受紫外光(波長小於380nm)照射後，形成電子與電洞對，並生成氫氧自由基(•OH)氧化降解有機物質，因此常應用於空氣淨化、水質淨化、抗污防菌等領域。本研究係針對冷卻水塔水質淨化，探討TiO2光觸媒對抑制藻類生長之可行性。研究結果顯示，接觸面積愈大以及濾片數愈多對於有機物的降解率愈高；另外，冷卻水塔中常見的藍綠藻（Phormidum sp），於二氧化鈦電泳沉積披覆濾片及UV-A光催化下，比較各操作條件下pH值、濁度及葉綠素a值(以環檢所-水中葉綠素a檢測法監測水中葉綠素a值)，得知添加濾片數愈多對其光合效率抑制愈佳。含有藻水體藉由光觸媒反應器以循環方式實驗30天，結果實驗組(減少67.71%)之葉綠素a值較對照組(增加10.80%)減少78.51%，顯示藻類生長受到抑制。

關鍵字

二氧化鈦光觸媒；藻類；光催化；冷卻水塔；葉綠素a

並列摘要

The growth of the algae and microorganisms in the cooling tower brings about the problem of filter blocking and fouling on the condenser surface which will cause more consumption of energy due to decrease of heat transfer efficiency. The traditional treatment of removing the algae and microorganisms is using chemical oxidants which will generate environmental problems. Titania photocatalyst after ultraviolet illuminated (wavelength less than 380nm) generated electron-hole pair and hydroxyl radical to oxidize organic compounds. The mechanism of titania photocatalyst used in various fields such as purification of air and water, resistance of bacteria and crush of algae. This study focused on purification of water quality in cooling tower and discussed the feasibility of restraining algae. The results showed that the rate of oxidization organic compounds based on the contacted area and the amount of filter film. The greater contacted area and more filter film increased the rate of oxidization organic compounds. In a separate experiment, the growth rate of Chlorophyll a value in Chlorophyll was investigated. The water contained algae was circulating through the fluidized bed photocatalytic reactor for 30 days. The photosynthetic efficiency of the algae was reduced after being irradiated with UV-A light in the presence of TiO2 filter film. The value of Chlorophyll a value in experimental group was 78.51% less than in the control group. This study was showed that the algae growth was inhibited by electrophoretic deposition filter.

並列關鍵字

TiO2 photocatalyst ； algae ； Cooling towers ； Chlorophyll a

參考文獻

[59]行政院環境保護署環境檢驗所–水中葉綠素a檢測方法－乙醇萃取法。

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[4]Zhang, L., “Development of TiO2 photocatalyst reaction for water purification,” Separation and Purification Technology , Vol.31, pp.105-110, 2003.

[5]Li, C.S., “Ultraviolet Germicidal Irradiation and Titanium Dioxide Photocatalyst for Controlling Legionella Pneumophila,” Aerosol Science and Technology, Volo.37,pp. 961-966, 2003.

[6]Kadlec, R.H., Knight, R.L., Treatment Wetlands CRC Press, USA, 2006.

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電泳沉積濾片應用於冷卻水塔藻化抑制之效益

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