Pretreatment of wastewater from 2-naphthol production by Fenton process

Fenton reagent was used in pretreatment of simulant 2-naphthol-containing wastewater.With the reaction process optimized by orthogonal experiment,it was found that,when the reaction time was 40min,the initial pH was 3.5,the m(H2O2)/m(COD) was 2,the n(H2O2)/n(Fe2+) was 12,the removal rate of COD reached 86%.The results showed that,the effect of reaction temperature on COD removal was not obvious,however,the rate of H2O2 consumption was 2.3 times that of COD removal,the results of the activated sludge inhibition test showed that,before the pretreatment by Fenton process,the EC50 value of the wastewater was 329mg/L,whereas,the pre-treated sampleshad no inhibition effect on activated sludge,which indicated that,Fenton pretreatment could effectively eliminate the biological toxicity of 2-naphthol-containing wastewater.