光觸媒反應器應用於空調冷卻水水質處理之研究

A Study on the Cooling Tower Water Treatment Using TiO2 Photocatalyst

臧鶴年(Ho-Nein Chang)

指導教授 ： 卓清松

國立臺北科技大學/機電學院/能源與冷凍空調工程系碩士班/碩士(2009年)

摘要

空調冷卻水塔容易滋生藻菌，造成過濾器阻塞、冷凝器表面結垢影響熱交換效率等問題，傳統上是採取加藥處理，但是隨著冷卻水排放，這些化學藥劑就會造成環境的影響。
二氧化鈦光觸媒於接受380nm以下波長紫外光的照射後，形成電子與電洞對，並產生氫氧自由基(•OH)，具有極強的氧化能力，可以分解有機物質，逐漸被應用在空氣淨化、水質淨化、抗菌、防污等領域。本研究係探討以二氧化鈦光觸媒抑制藻類生長的可行性，研究結果顯示，台灣北部地區空調冷卻水塔內生長的藍綠藻（Phormidum sp），在TiO2矽膠粒光觸媒及UVA光催化作用下，以葉綠素螢光測定儀量測，顯示其光合效率被抑制。另外，將含有藻的水體，以循環方式流經光觸媒反應器，經過20天的實驗，實驗組的藻重量較對照組約減少20%，顯示藻的生長受到抑制。

關鍵字

二氧化鈦光觸媒 ； 藻類 ； 光催化 ； 冷却水塔

並列摘要

The growth of algae and microorganisms in the air-conditioning system cooling tower causing the problem of strainer clogging and heat transfer efficiency decrease due to bio-fouling of heat exchanger. Traditional water treatment by addition of chemical oxidants causes environmental problems.
Upon excitation by light of wavelength less than 380nm, the electron-hole pair generated on the TiO2 photocatalyst surface and produce hydroxyl radical which oxidize organic compounds. The study of photocatalytic inactivation of algae (Phormidum sp), a kind of fresh water algae usually found in the air- condition system cooling tower in Taiwan area was carried out. The results showed that after being irradiated with UV-A light in the presence of TiO2 dipped silica gel beads, the photosynthetic efficiency of the algae was reduced determined by Chlorophyll fluorescence method. In a separate experiment, by circulating the water containing algae through the fluidized bed photocatalytic reactor for 20 days, the weight of the algae collected from the water tank was 20% less than that of the water tank which was not subject to photocatalysis treatment. It suggested the algae growth have been inhibited.

並列關鍵字

TiO2 ； photocatalytic ； algae ； cooling tower

參考文獻

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