Apply Nano-Photocatalyst to Degrade Aquatic Natural Organic Matters

• Main Authors: Li, Zheng-Da, 李政達
• Other Authors: Chen, Chang-Yu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/67987637758918465997

碩士 === 弘光科技大學 === 環境工程研究所 === 102 === Water is the resoure of surviving for most organisms on earth. However, the drinking water contained natural organiic matters resulted in color, oder and regrowth of biomass in the distribution system. The NOMs(Natural Organic Matters) in water will result in the formation of THM. The TiO2 has the characteristics of no toxicity, stability in chemical reaction and high photo-reactivity. However the TiO2 was not easy to recover from liquid state. If the TiO2 can fixed on media, will promote the wide and safe applications. The study used the sol-gel method to prepare the photo-catalyst of TiO2, and combined with microwave scheme(800W, 30 minutes) to heat the catalyst. The photo-catalyst has the diameter of 40~50 nm and the type of Anatase or Rutile, special surface area was 173.9 m2/g. The catalyst was compared with suspended and fixed types.The fixed TiO2 was plated on polyester media. The experiment focused on the suspended and fixed TiO2 reacted in variation concentration of humic acid and discussed the THMFP by chlorination. The result that suspended TiO2 was better than fixed TiO2, no matter what the concentration of TiO2. The removal rate of humic acid was 90% and the constant of reaction rate was 0.8757 hr-1,when the ultraviolet illuminated for 60 minutes on the optimum dosage of TiO2was 75 mg/L. The DOC removal rate was 57% and 51% on suspended and fixed TiO2,respectively. As the same time, the removal rate of THM was 25% and 15%,respectively. However, the fixed TiO2 didn’t need to be filtrated by membrane, and make it convenient for different shape on the device.