The method of Fenton oxidation cooperated with coagulation for biologically treated coking wastewater was conducted.Based on both of the removal performance and the operating costs,optimal reaction condition was proposed.Operating at H_2O_2 concentration 220(mg/L),Fe~(2+) concentration 180(mg/L),PAM concentration 4.5(mg/L),reaction time 0.5h and pH=7,about 44.5% of COD was removed and chroma reached 35.In addition,through analyzing of the changes of molecular weight distribution and constitute of organic co...