Pretreatment of quinacridinone pigment-intermediate wastewater by ferric-carbon microelectrolysis combined Fenton oxidation process

Quinacridinone pigment-intermediate wastewater was pretreated by ferric-carbon microelectrolysis combined Fenton oxidation process.The optimal condition for the microelectrolysis was: the pH value was 5,the volume ratio of iron and water was 0.375,the iron-carbon ratio was 1,the reaction time was 60 min;the most important parameter for ferric-carbon microelectrolysis was pH value,successively followed with the dosage of scrap iron,volume ratio of scrap iron and carbon,reaction time.The optimal condition for Fenton oxidation process was: the pH was 4-7,the reaction time was 50 min,the dosage of FeSO4 and H2O2 were 300 mg/L and 2.5 mL/L respectively.the results of the test showed that,combined the two processes to treat quinacridinone pigment-intermediate organic wastewater could obtain an obvious effect,under the optimal condition,when the mass concentration of COD in influent water was 16 800 mg/L,the colority was 20 000 times,the total removal rate of COD was above 94%,the colority of the effluent water was lower than 40 times,which created an advantageous condition for the following treatment.