探討臭氧結合紫外光反應去除腐植酸之降解情形

The Investigation of UV/O3 to Decompose Humic Acids

江佳玲(Chia-Ling Chiang) ； 張鎮南(Cheng-Nan Chang) ； 黃科倫(Ke-Lun Ng)

《東海科學》 9期 (2007/07) Pp. 15-28

https://doi.org/10.29723/TS.200707.0003

摘要

本研究利用腐植酸模擬原水，將其進行臭氧結合紫外光反應，探討臭氧結合紫外光與腐植酸在不同pH值、不同濃度作用之情形及處理腐植酸的降解效果。利用即時監測系統建立腐植酸經臭氧結合紫外光降解的模式，來模擬定量、定性下氧化還原電位變化情形，並以色度來判斷腐植酸降解情形，間接了解腐植酸被氧化程度。藉由A254探討腐植酸的雙鍵降解情形，可以反應水中芳香族或具有不飽和構造有機物的含量。配製兩種腐植酸濃度分別爲40mg/L及10 mg/L，腐植酸經臭氧化處理後，結果顯示10mg/L之腐植酸濃度去除速率較40 mg/L者佳。且由A254得知去除10 mg/L腐植酸爲90%與40 mg/L爲84.2 %的共軛雙鍵。經由ADMI分析發現經臭氧結合紫外光反應30分鐘後，其ADMI值爲2~7，接近一般水質的ADMI值；故以ADMI值及A254值驗證腐植酸能確實地被臭氧氧化降解，且以pH7的條件降解效果最佳。

關鍵字

臭氧 ； UV ； 腐植酸 ； 即時監測 ； 氧化還原電位 ； ADMI

並列摘要

In this study, humid acids was used to simulate raw water and was reacted with ozone combined with ultra violet (UV/O3) to investigate the reaction under different pH and concentration in order to assess the decline of humid acids which was carry out with UV/O3. Using on-line monitor data and establish the model of declination of humid acids in the reaction in order to simulate the variation of oxidation-reduction potential (ORP) under a quantitative and qualitative conditions. Using the ADMI determine the situation of declination of humid acids, indirectly evaluated the degree of being oxidized. Besides, by examining the absorbance at 254 nm (A254) to confer the situation of double bond declination in humid acids. It can reflect the content of aromatic group or unsaturated organic matters after being treated with UV/O3. Two concentrations 10 mg/L and 40 mg/L were used to carry on the reaction. The result shows that the removing rate of 10 mg/L humid acids is faster than that of 40 mg/L. The A254 was removing to the level of 90 % (10 mg/L) and 84.2 % (40 mg/L) respectively. Besides, after a reaction time of 30 minutes, the ADMI of the sample dropped to 2~7, which is very close the normal water quality; as a result, ADMI value and A254 prove that humid acids is oxidized by ozone and the best result was obtain under the condition of pH 7.

並列關鍵字

ozone ； UV ； humic acids ； on-line monitor ； oxidation-reduction potential ORP ； ADMI