关键词: 废水, 脉冲放电, 单针-板电极, 降解, 中间产物, 环境

Abstract: In order to enhance the effect of pulse discharge on degradation of organic matter, a pulse discharge system of single needle-plate electrode aimed at phenol was established. The paper investigated the effect of various factors on phenol degradation and analyzed the degradation of intermediate products and their concentrations in the degradation process. Such factors, as pulse voltage, electrode spacing, needle-liquid spacing, pulse frequency, and air volume, had a great influence on the degradation rate of phenol. Phenol degradation rate increased with the increase of pulse voltage and tended to stablize while pulse voltage reached a specific value. With the increase of electrode spacing, needle-liquid spacing, pulse frequency, air volume, degradation rate of phenol increased, but, would decrease while each factor was greater than a specific value. Under the best condition of 10mm electrode spacing, 7.5mm needle-liquid spacing, 26kV pulse voltage, 70Hz pulse frequency and 1.5L/min aeration, phenol degradation rate was 64.63% when 100mL concentration of 100mg/L of phenol wastewater was discharged for 60min. In addition, phenol degradation rate reached 85.02% when wastewater was discharged for 140min. The concentration of byproducts such as resorcinol, hydroquinone, benzoquinone and catechol increased firstly, then decreased gradually and eventually disappeared with the increase of discharge time. Besides, concentration of resorcinol was the lowest and appeared in two stages, that of benzoquinone was the largest, and catechol disappeared first. The completeness of phenol degradation could be improved by studying the change of byproducts.

Key words: waste water, pulse discharge, single needle-plate, degradation, byproducts, environment