According to the characteristics of low p H,high content of Cu,Ni and ammonia nitrogen of printed circuit board integrated wastewater,the wastewater treatment was carried out by using iron carbon catalytic internal electrolysis combined with A/O process. Under the optimum conditions,the removal rate of total copper in the first stage catalytic internal electrolysis was 99. 6%,which reduced from 179. 7mg/L to 0. 71 mg/L,and the removal rate of total nickel was 62. 7%,which reduced from 0. 83 mg/L to 0. 31 mg...