| Summary: | 碩士 === 元培醫事科技大學 === 環境工程衛生系碩士班 === 105 === tetramethylammonium hydroxide is a corrosive and toxic chemical, Its structure is stable, therefore, if the surface water or wastewater containing TMAH residue to be take seriously. Since the advanced oxidation processes to treat organic reaction time is shorter, For the degradation of harmful organic matter is good, used in the treatment of various organic matter, Therefore, in addition to the use of ultrasonic, ultraviolet and ozone degradation of tetramethylammonium hydroxide wastewater, Both procedures total with each other by changing various conditions of the reaction, Containing pH, ultrasonic wave watts, ozone aeration, reaction temperature, etc. to explore the situation of degradation of tetramethylammonium hydroxide, and the trend of pH value and ORP (oxidation reduction potential) was observed during the reaction. According to the experimental results, the removal rate of TMAH was between 1.1% and 5.1% after 60 minutes of reaction at pH 3, 5, 7, 9 and 11 for 60 minutes, and the total organic carbon (TOC) mineralization rate is only 3.1%, showing that the effect of pH change is not significant; in addition, the ultrasonic program is best at 55°C, TMAH removal rate is about 8.4%, The mineralization rate of 7.1%, and from the foregoing results that the ultrasound system alone on the tetramethylammonium hydroxide performance is not ideal. Ozonation was reacted at pH 3 to 11 for 120 minutes, respectively. TMAH had better removal efficiencies at pH 10 and 11, with removal efficiencies of 35.4% and 58.4%, respectively, and TOC removal rates of 7.4% and 21.8% Ozonation can effectively degrade and mineralize TMAH. If the program in conjunction with ozone ultrasound (abbreviated Sonozone procedure) and were reacted at ultrasonic power 25 W, 50 W, 75 W, 100 W and 200 W at 120 min, the removal rate was 61.8% of TMAH, 74%, 75.9%, 89.5% and 81.5% respectively, TOC removal rate was 33.4% while, 47.1%, 68.5%, 77.5% and 62.8%, which has 100 W of removal was better; After the program Sonozone reaction at different temperatures 25oC, 35oC, 45oC and 55oC conditions for 120 minutes, the removal rate was 66.3% of TMAH, 66.1%, 64.1% and 56.3%, and the TOC removal rate was 33%, 45.3%, 47.6%, and 30.6%; The reaction among different programs TMAH removal rate after 120 minutes 63.4% (O3/H2O2), 58.4% (O3), 52.0% (UV/O3/H2O2), 40.6% (UV/O3) and 12.3% (UV/H2O2), and the removal rate of TOC were 28.0%, 21.8%, 25.1%, 17.8% and 11.0%. The removal rate of 31.7% TMAH reacted after about 120 minutes O3 procedure, TOC removal rate was 12.2%, respectively. From the above results, it is known that the ultrasonic process is in significant on the removal of TMAH. Ozonation has a suitable treatment efficiency under alkaline conditions.In the cell viability toxicity test, it was shown that the Ozonation procedure had a better survival rate at pH 9 cells after response and had better cell viability at 100 mg/L in different concentrations,The results showed that the cell viability of Ultra-fine bubble was better under different bubble size. The O3/H2O2 program was the best in different procedures. The results showed that the optimum concentration of O3/H2O2 was 8 mM.In the O3/H2O2 process, it is proven that the addition of the oxidant can effectively improve the removal and minteralization efficiency of TMAH.
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