Study on the Treatment of Azo Dye Wastewater by Electro-synergistic Fe2+Activated Persulfate
Azo dye wastewater can cause great harm to the natural environment and human health.To study the electrosyner-gistic Fe2+activated persulfate system for the efficient treatment of azo dye wastewater,using Golden Orange G wastewater as the treatment object,the effects of different reaction conditions such as pH,Fe2+dosage,peroxodisulfate(PDS)dosage and current density on the treatment effect were investigated,and the Response Surface Method(RSM)was used to optimise the reaction conditions and to determine the treatment effect under the optimal reaction conditions.The results showed that under the conditions of pH 3,plate spacing of 9 cm,current density of 15 mA/cm2,PDS dosage of 6.66 mmol/L,Fe2+dosage of 2 mmol/L,and Na2SO4 dosage of 89.39 mmol/L,the average removal of Golden Orange G wastewater was 93.03％in terms of chromaticity,and the average removal of COD was 85.80％.The analysis of the free radicals and degradation mechanism that play a major role in the electrosynergistic Fe2+activation of persulfate system confirmed the synergistic effect of electricity and Fe2+.This study provides technical support for the application of electrosynergistic Fe2+activated persulfate system in the field of azo dye wastewater treatment.
persulfateGolden Orange G wastewaterFe2+ionsresponse surface method
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