Evaluation of energy transfer and utilization efficiency of azo dye removal by different pulsed electrical discharge modes

作     者：SHEN YongJun LEI LeCheng ZHANG XingWang 

作者机构：Institute of Environmental Pollution Control Technologies Zhejiang University Hangzhou 310028 China 

出 版 物：《Chinese Science Bulletin》 (Chin. Sci. Bull.)

年 卷 期：2008年第53卷第12期

页      面：1824-1834页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 070208[理学-无线电物理] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 08[工学] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China (Grant Nos.20336030, 90610005,20576120 and U0633003) Distinguished Youth Foundation of Zhejiang Province (Grant No.RC 02060) 

主　　题：氮 能量传递 利用效率 电流量模式 

摘      要：The degradation of an azo dye, acid orange 7 (AO7), caused by different high voltage pulsed electrical discharge modes (spark, streamer and corona discharge) induced by the various initial conductivities was investigated. A new type of pulsed high voltage source with thyratron switch and Blumlein pulse forming net (BPFN) was used. The typical discharge waveforms of voltage, current, power, pulse en-ergy and the pictures of spark, streamer and corona discharge modes were presented. The results in-dicated that pulsed electrical discharges led to complete decolorization and substantial decrease of the chemical oxygen demand (COD) of the dye solution. The main intermediate products were monitored by GC-MS. The discharge modes changed from spark to streamer and to corona discharge, and the streamer length decreased with the liquid conductivity increasing. At a constant input power, the peak voltage, peak current, peak power and energy per pulse of the three discharge modes ranked in the following order: spark streamer corona. The effective energy transfer efficiency of AO7 removal was higher for spark discharge (57.2%) than for streamer discharge (40.4%) and corona discharge (27.6%). Moreover, the energy utilization efficiency of AO7 removal for spark discharge was 1.035×10^(-9) mol/J, and for streamer and corona discharge they were 0.646×10^(-9) and 0.589×10^(-9) mol/J. Both the energy transfer efficiency and the energy utilization efficiency of spark discharge were the highest.