Pretreatment of Wastewater from p-tert-butylphenol Formaldehyde Resin Synthetic Process by Ferric-carbon Micro-electrolysis and Fenton Reagent

The combined process of ferric-carbon micro-electrolysis and Fenton reagent was used to pretreat the wastewater from p-tert-butylphenol formaldehyde resin synthetic process. The influence factors of pH,reaction time and H2O2 dosage were investigated. The results show that when the influent COD is 12 300 mg/L to 17 600 mg/L,pH is 2.0 and the reaction time is 120 min,the removal rate of COD by ferric-carbon micro-electrolysis is above 50%. For treatment with the Fenton reagent,when the H2O2 (30%) dosage is 2.4 mL/L,the reaction time is 60 min and the temperature is 20 to 30 ℃,the removal rate of COD reaches more than 83%,and the B/C ratio of wastewater increases from 0.034 to 0.35. After biochemical treatment of the pretreatment effluent with adjustment of pH value and dilution,the effluent quality can reach the second class criteria specified in the Integrated Wastewater Discharge Standard (GB 8978-1996).