Treatment of sulphur red brown intermediate by fenton oxidation and iron-carbon microelectrolysis.

As one of the most unmanageable wastewater,development of new processing technology for sulphur red brown wastewater is becoming very important.Treatment of sulphur red brown wastewater by Fenton oxidation and iron-carbon microelectrolysis was studied,with the optimum conditions of iron-carbon microelectrolysis obtained by orthogonal experiment as pH 2.5,cubage proportionment of iron to carbon 5:1 and reaction time 2h.The optimum conditions of Fenton oxidation were obtained by single factor experiment,with concentration of Fe2+ 116.2mg/L,dosage of H2O2 20mL/L and reaction time 65min.The experiment results showed that COD removal rate reached to 60.47%,chroma removal rate reached to 96.8%,and BOD5/CODcr increasing from 0.08 to 0.21 in wastewater treated by iron-carbon microelectrolysis,then COD removal rate reached to 89.0%,chroma removal rate reached to 98.0% and BOD5/COD increasing from 0.21 to 0.38 in wastewater treated by Fenton oxidation.COD removal efficiency can be up to 95.6% by the combined process.