摘要
Abstract
A novel ultrasonic-three-dimensional electro-Fenton oxidation system was constructed,utilizing ruthenium-iridium-titanium electrodes as the anode,graphite electrodes as the cathode,and iron-carbon composite particles as the three-dimensional electrode.The effects of ultrasonic power,initial pH,electrode spacing,current density,H2O2 dosage,Fe2+dosage,and iron-carbon composite particle dosage on the removal efficiency of COD from acrylic fiber production wastewater were systematically investigated.The optimal process conditions were identified,and the comprehensive treatment performance of the acrylic fiber production wastewater under these conditions was evaluated.The results indicate that the optimal process conditions for the ultrasonic-three-dimensional electro-Fenton oxidation treatment of acrylic fiber production wastewater are as follows:a current density of 5 mA/cm2,an electrode spacing of 4 cm,an ultrasonic power of 250 W,an initial pH of 3.5,a Fe2+dosage of 75 mmol/L,a H2O2 dosage of 150 mmol/L,and an iron-carbon composite particle dosage of 100 g/L.Under these conditions,after 50 minutes of reaction,the removal rates of COD,BOD5,and color in the wastewater reach 90.2%,85.0%,and 83.3%,respectively.Additionally,the ratio of BOD5 to COD increased from 0.23 to 0.35.In the presence of ultrasound,the collapse of cavitation bubbles generates significant shock forces and micro-jets,which continuously scour the electrode surfaces.This action effectively mitigates electrode passivation,enhances mass transfer efficiency,and reduces concentration polarization,thereby improving the COD removal rate.In the ultrasonic-three-dimensional electro-Fenton oxidation system,two types of free radicals,·OH and·O2-,are detected,with·OH playing the dominant role.关键词
超声波/三维电极/电Fenton氧化/腈纶生产废水Key words
ultrasonic/three dimensional electrode/electro Fenton oxidation/acrylic fiber production wastewater分类
环境科学
