The Study on The Removal of 2,4-Dichlorphenol from Aqueous olution by Ozone and Fluorocarbon

• Main Authors: Gwo-Dong Yeh, 葉國棟
• Other Authors: Dr.Jong-Nan Chen
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/81195773754273269830

碩士 === 國立交通大學 === 環境工程研究所 === 82 === Ozone, due to its powerful oxidation potential, is considered to be an alternative for the refractory compounds. It has been limited hower, because of ozone's low solubility in water and high charge of equipment, so it can't be extensively in wastewater process. Two-phase ozonation system is a new method for the removel of organic pollutants from wastewater. This system consists of a chemical extraction from the aqueous phase accompanied by oxidation by ozone in both the solvent and aqueous phase. The experiments performed in this study, were preliminary investigations into this semibatch system. In this study a Taguchi Styled design of experiment is selected to identify the significant factors and establish the optimal combination of process parameters of the novel method. The results indicate that the optimal combination represents as follow: agitated level( 1000 rpm), flow rate of the feed gas( 800 ml/min), ozone production rate( 200 Volt), 2,4-dichlorphenol concentraction( 100 mg/L), pH value( 7.5 ), Ion strength( 0.01 M), reaction temperature( 20 ℃). However, it is suggested that at the begin of reaction, the ozone mass- transfer controlled mechanism is predominant, then we find the limit rate mechanism that is changed controll by ozone-reaction- rate . Secondly, under the optimal condition, the pseudo-first order kinetic rate constant is 0.145 l/min, the dosage of ozone for the decomposition of 2,4-dichlorphenol is 5.24 m mole O3/m mole 2,4-dichlorphenol, the mineralization of 2,4-dichlorphenol is about 21.5% and the production of the chlorine ion is 88%.