The objective of this research was to develop and evaluate the combined physicochemical-biological process of phosphorus removal. Four bench scale activated sludge reactors were operated with domestic wastewater generated from Kyung Hee University. Iron electrodes were connected to the aeration basin of three reactors and received an electric current to produce Fe^(3+) formed by the anode dissolution process. One reactor without iron electrode was operated as a control unit. The surface area of iron electrode, phosphorus concentration in influent and operating condition of activated sludge units were changed to study the effect of electrolysis with the iron electrodes. The test results indicated that the electrolysis of iron is an effective way for phosphorus removal and the addition of iron oxide improve the substrate removal efficiency of activated sludge and sludge settling characteristics. It was determined that the effective surface area of iron electrode to obtain 80% of phosphorus removal was 30㎎P/㎠ iron electrode day, and with that condition, more than 90% of TCOD and TSS removal efficiency could be accomplished. It seems that the electrolysis with iron electrode did not affect the biological kinetic coefficients. The obtained yield coefficient(Y) and decay coefficient(K-d), were 0.64㎎MLSS/㎎COD and 0.19day, respectively and were approximately same as the value of conventional activated sludge process.