利用光催化薄膜反應器及缺氧/好氧薄膜反應器處理光電產業有機廢水

Combination of photocatalysis and A/O MBR for TFT-LCD organic wastewater treatment

陳昱溥(Yu-Pu Chen)

指導教授 ： 游勝傑

中原大學/工學院/土木工程研究所/碩士(2011年)

https://doi.org/10.6840/cycu201101012

摘要

本研究利用光催化薄膜反應器及缺氧/好氧薄膜生物反應器 (A/O membrane bioreactor, A/O MBR) 處理光電有機廢水，並探討碳、氮成分廢水之處理效率。在光催化薄膜反應器方面，所控制的操作參數為不同UV 光照方式、槽體中pH 值與二氧化鈦添加量，在不同UV光照方式試驗，可以發現MEA降解效率與光照時間成正比關係。在不同pH值試驗時發現在鹼性環境下MEA降解效率較中性環境佳。也發現到TiO2添加量越多MEA的降解效率越高，當添加量達到1.0 g/l時MEA降解效率達到96%。由實驗結果可看出光催化薄膜反應器以全光照方式、pH值11及TiO2添加量1.0 (g/l)操作對處理光電產業有機廢水有最佳的處理效果。本研究另以不同迴流比 (0.5、1.5、2.5)為操作參數探討A/O MBR 之最佳迴流比，A/O MBR 在不同迴流比時對COD 、MEA 和氨氮均有極佳之處理效率，對上述三種有機化合物之去除率分別為98%、100%及100%。但對於TMAH之去除效果並不佳，推測為水力停留時間較短，使水中微生物還未適應以致於降解效率僅有38%。在不同迴流比下放流水之硝酸鹽濃度有著明顯差異，迴流比分別為0.5、1.5、2.5時放流水硝酸鹽平均濃度分別為12 mg/l、8 mg/l、 16 mg/l，迴流比1.5 時放流水硝酸鹽濃度較低，表示反應槽內脫硝及硝化作用較完整，因此挑選迴流比1.5為最佳操作條件。總體而言，光電有機廢水利用光催化薄膜反應器及A/O MBR 處理都有良好的效果，因此結合化學氧化及生物處理法來處理難分解或具抑制性之TFT-LCD製程有機廢水為一值得期待的方法。

關鍵字

光電產業有機廢水 ； 光催化 ； 二氧化鈦 ； 缺氧/好氧薄膜反應器

並列摘要

In this work, photocatalytic membrane reactor and A/O membrane bioreactor (A/O MBR) was applied for the treatment of organic wastewater from electro-optical industry. In addition, the treatment efficiency of carbon and nitrogen containing wastewater were discussed. In this experiment of photocatalytic membrane reactor, the operational parameters were set as follows, different UV irradiation, pH value between 7~11, added amount of TiO2 (DegussaP25 TiO2) between 0~1.0 g/1. After repeated trials, the optimal operational conditions were full UV irradiation, pH vale = 11, added amount of TiO2 = 1.0 (g/1). The MEA degradation rate was 90%,93%, and 98% respectively. Different circulation ratios (0.5, 1.5, 2.5) were adopted as operational parameters for the discussion of the optimal circulation ratios for A/O MBR. A/O MBR has excellent treatment efficiency of COD, MEA, and ammonia, and the removal rate for the above mentioned organic compounds were 98%, 100%, and 100%, respectively. However, the removal efficiency of TMAH was not better. It was assumed that hydraulic retention time (HRT) was not long enough for the microorganism in water to adapt, therefore the degradation efficiency was only 38%. Under different circulation ratios, the concentration of nitrate varied significantly. The average nitrate concentration was 12 mg/l, 8 mg/l, 16 mg/l for the circulation rations of 0.5, 1.5, 2.5, respectively. When the circulation ratio was 1.5, the concentration of nitrate was lower, indicating the denitrification and nitrification were more complete. Therefore the circulation ratio=1.5 was chosen as the optimal operation condition. In conclusion, the treatment of wastewaters from electro-optical industry using photocatalytic membrane reactor and A/O MBR both had better removal efficiency. As a result, the combination of chemical oxidation with biological treatment provides an anticipating solution for the undegradable and inhibitive organic wastewater generated during TFT-LCD fabrication processes.

並列關鍵字

A/O MBR ； TiO2 ； Photocatalysis ； TFT-LCD organic wastewater

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