Feasibility Evaluation of Ethylenediamine Wastewater Decontamination by a Continuous Dosing Mode Sono-Fenton Process

• Main Authors: Yu-Xiu Wei, 魏語秀
• Other Authors: Ying-Shih Ma
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/17618137020763970070

碩士 === 元培科技大學 === 環境工程衛生研究所 === 101 === Contamination of ethylenediamine (C2H8N2), which is a bio-refractory and non-biodegradable compound, is generally used in organic stripping liquids and is the main organic pollution source in the wastewater of IC industry. To investigat the effects of different reaction parameters such as pH values, H2O2 and Fe2+ dosages, reaction temperatures, anions and initial concentrations of ethylenediamine, a continuous dosing mode Sono-Fenton process was carried out in this study to degrade and mineralize the ethylenediamine wastewater and evaluate its feasibifity. Profiles of oxidation reduction potential (ORP), pH, H2O2 concentration, removal of ethylenediamine and total organic carbon (TOC) were measured during the reactions. Experimental results indicated that the degradation of ethylenediamine were 15.4%, 17.2%, 44.9% and 61.0%, respectively, through sole ultrasound process, ultrasound/H2O2 process, Fenton process and Sono-Fenton process under the same conditions; the first-order reaction rate constants were 3.2, 3.9, 4.6 and 6.3 ×10-2 min-1. Removal of TOC were 15.3%, 17.4%, 39.7% and 53.5%. It was found that pH 3.0 showed a better degradation efficiency of ethylenediamine, which was more than other pH levels in 17-39%. Higher H2O2 dosage was profitable to ethylendiamine as the Fe2+ was controlled at constant dosage; additional Fe2+ dosages was wortless to enhance the ethylenediamine degradation. The temperature of 25oC was better than other temperatures. Presences of anions inhibited the degradation of ethylenediamine by Sono-Fenton process. Hence, feasibility of continuous dosing mode Sono-Fenton process regarding ethylenediamine degradation were proven at suitable experimental conditions.