壓力式臭氧化系統處理生物難分解性有機污染物之研究

Abstract

本研究以建立一高壓臭氧化反應系統為目的，並藉此高操作壓力企圖增加臭氧在溶液中溶解度，加速系統反應效率。本實驗中改變操作壓力、pH值與臭氧流量等變因，試圖找出以上操作變因對本系統效能之影響。並針對生物難分解性有機物以及實際石化廢水廠的臭氧化試驗，藉由分析其反應速率、礦化程度與生物毒性變化等，評估此臭氧化系統的效能。 本研究經由臭氧溶解度與質傳試驗，發展出在不同操作條件下之臭氧溶解行為模式，突破傳統只侷限在常壓操作的臭氧質傳模式，並得到在臭氧進流濃度為8.0（mg/l），操作壓力為1atm、2atm、3atm、4atm，（pH=3）臭氧之溶解度為1.992、4.008、6.265、7.956 （mg/l）。此外，針對氯酚類化合物經本系統處理的反應速率、礦化率與生物毒性也被分析與評估。最後藉由實廠廢水臭氧化試驗，可以得到其去除動力關係、生物可分解性的變化，並進行臭氧化系統的經濟評估。

The objective of this study is to build the Pressurized ozonation system. It is attempted to increase both the solubility of ozone in solutions and the reaction efficiency of the system We find the effects caused by the operating parameters including the reactor pressure, the hydroxyl ion concentration and the ozone gas flow rate The analysis of reaction rate, mineralization efficiency and toxicity are carried out during the whole experiment. Furthermore, on the basis of the analysis, we made within the system we can evaluate the performance of the system. After understanding all the results from the ozone solubility and the mass transfer experiments, we can establish models to simulate the behaviors of ozone in solution under different conditions. We also analyze and evaluate the results obtained from the ozonation of the chlorophenols chosen in this study. After the ozonation tests of the actual petrochemical wastewater, we can get the chemical oxygen demand removal efficiency and the changes on the biodegradability. Finally we also carry out an economic evaluation for the ozonation system.