Study of the Electrocoagulation System for Enhancing the Removal Efficiency of S2-in Sulfur Black Dyeing Wastewater
To enhance the removal efficiency of S2-in sulphur dyeing wastewater,the magnesium and iron were used as the alternating anodes,and an AC power supply was selected to construct an electric flocculation-Fenton coupling system.Response surface method(RSM)was used to optimize the design and validation of the system parameters,such as applied voltage,electrolysis time,initial pH value and the H2O2 dosage,and their effects on the removal of S2-,chromaticity and the removal of chemical oxygen demand(COD)in the wastewater were investigated.The results show that the addition amount of H2O2 has a certain effect on both the removal rate of COD and S2-,and the S2-concentration is heavily influenced by the compound effect of multiple factors.Under the condition of applied voltage of 27 V,electrolysis time of 40 minutes and initial pH of 5.9,the maximum removal rate of 79.41％for the S2-is achieved with the addition of hydrogen peroxide in a volume of 0.4 mL.At this point,the COD removal rate is 48.08％and the chromaticity can reach 30 times.
Sulfur Black Dyeing WastewaterAlternating Current FlocculationResponse Surface MethodologyS2-Removal RateElectric-fenton
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