Study on Pretreatment of Wastewater Containing Phenol and Formaldehyde in Fuzhou City

Treatment of wastewater containing phenol and formaldehyde in Fuzhou City was carried out by microelectrolys-Fenton oxidation-coagulation process.The influencing factors were investigated and the optimal working condition was sought for.Results show when the reaction time for the microelectrolysis is 1 h,pH is 2.3 0,the reaction time for the Fenton oxidation is 1h and the dosage of H2O2(30%) is 4 g/L,pH and mass concentration for coagulation are 8.5 and 800 mg/L,the removal rate of CODcr,phenol and formaldehyde are about 89.6 %,84.3 %,98.5 % respectively at the CODcr in influent 56920 mg/L,pH value 2.30,phenol 1279 mg/L,and formaldehyde 12951 mg/L,providing the good premise for the following biological treatment to remove.