結合臭氧與過氧化氫處理飽和層及未飽和層柴油污染物試驗

王盈順

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結合臭氧與過氧化氫處理飽和層及未飽和層柴油污染物試驗

Combination of Ozone and Hydrogen Peroxide to Degrade Diesel Contaminant in Saturated and Vadose Zones

王盈順 , Masters　　Advisor：劉敏信　　

繁體中文

化學氧化法；過臭氧反應；氫氧自由基；金屬腐蝕；臭氧尾氣； Chemical oxidation ； Peroxone reaction ； Hydroxyl radical ； Metal corrosion ； Ozone off-gas

Abstract │ Reference (100)

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Simulations of saturated and vadose zones were simultaneously contaminated by diesel oil in this study. Using ozone sparging and injecting hydrogen peroxide into the vadose zones to explore the chemical oxidation ability. This study also investigated the chemical equivalent amount of ozone required for diesel oil, hydrogen peroxide concentration, and pH value for exploring the formation of hydroxyl free radicals. The optimal quantity of ozone sparging combined with hydrogen peroxide, with the lowest ozone sparging and the shortest time, to achieve the best diesel removal efficiency was investigated. 
In the first stage, the initial diesel concentration in soil was 24,200 mg/kg, the initial diesel concentration in groundwater was 300 mg/L, and the ozone flow rate was 2,888 mg/min. Ozone was used only without hydrogen peroxide addition in this stage. After one hour ozone sparging into the groundwater, diesel had been completely degraded, and when the cumulative batch ozone sparging was conducted for 12 hours, the diesel in soil was degraded by 37%, the diesel in soil was degraded by 58% after cumulative batch ozone sparging for 24 hours. In the second stage, the initial diesel concentration in soil was 32,131 mg/kg, the concentration of hydrogen peroxide was 7%, and the addition was 7% H2O2: soil = 1: 100 (w/w), the ozone flow rate was 2,888 mg/min, The degradation efficiency of diesel in soil was 63% after 12 hours of ozone sparging, and 78% after 24 hours of cumulative batch ozone sparging. In the third stage, the initial diesel concentration in soil was 17,115 mg/kg, the concentration of hydrogen peroxide is 7%, and the addition was 7% H2O2: soil = 2: 100 (w/w), the cumulative removal efficiency of diesel in soil was 64% after 12 hours of cumulative batch sparging. In the fourth stage, the initial diesel concentration in soil was 14,286 mg/kg, the concentration of hydrogen peroxide was 10%, and the addition was 10% H2O2: soil = 2: 100 (w/w), the degradation efficiency of diesel in soil was 37% after 12 hours of cumulative batch sparging, and the effect of higher hydrogen peroxide concentration was less significant degradation. In the fifth batch, The concentration of H2O2: soil = 2: 100 (w/w), the biodegradation efficiency of diesel in soil was only 15% after 12 hours of cumulative batch sparging, and the concentration of hydrogen peroxide was 4%, the result showed insufficient oxidation capacity was possessed in low hydrogen peroxide concentration.
Peroxone system and equipment were established in this study, by changing operating parameters such as hydrogen peroxide concentration and proportion, the result indicated that the peroxone reaction system could more efficiently degrade high concentration of diesel in the saturated and unsaturated zones. The use of hydrogen peroxide 7%, with the weight ratio of 2% as the operating conditions approached the optimal and economical results, the operating conditions should be able to provide domestic manufacturers to use the peroxone oxidation method for field applications.

Reference ( 100 ) 〈TOP〉

Alder, M. G. and Hill, G. R., “The kinetics and mechanism of hydroxideion catalyzed ozone decomposition in aqueous solution,” J. Am. Chem.Soc., Vol. 72, pp. 1884 (1950).
Acero J. L. and Gunten, U. V., “Characterisation of oxidation processes: ozonation and the AOP O3/H2O2,” Journal of American Water Works Association, Vol. 93, Issue 10, pp. 90-100 (2001).
American Public Health Association, American Water Works Association & Water Pollution Control Federation, Standard Methods for the Examination of Water and Wastewater, 22nd ed., Method 4110B, pp.4-5~4-7. APHA, Washington D.C., USA (2012).
Alcantara-Gardu˜no, Martha E., Okuda, T., Tsai, T. Y., Nishijima, W., and Okada, M. “Experimental and mathematical evaluation of trichloroethylene removal from saturated soil using acetic acid with saturated ozone,” Separation and Purification Technology, Vol. 60, pp. 299-307 (2008).
Adams, C. D., Scanlan, P. A., and Secrist, N. D., “Oxidation and biodegradability enhancement of 1, 4-dioxane using hydrogen peroxide and ozone”, Environmental Science & Technology, Vol. 28, pp. 1812-1818 (1994).

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