NOVELTY - A method of removing phosphorus from sewage wastewater by electrocoagulation, involves: providing an electrocoagulation tank for treating sewage, where the electrocoagulation tank includes an electrode assembly comprising an anode and a cathode with a porous membrane interposed between them; passing sewage wastewater through the electrocoagulation tank to treat the sewage wastewater by electrocoagulation; and introducing the treated water, passed through the electrocoagulation tank, into a mixing tank.    USE - For removing phosphorus from sewage wastewater by electrocoagulation (claimed).    ADVANTAGE - The method efficiently removes phosphorus from sewage wastewater containing soluble phosphorus in the electrocoagulation tank and minimizes the regeneration of sludge caused by metal hydroxide. The method effectively removes phosphorus from sewage, while inhibiting the production of sludge of metal hydroxides such as iron oxide or aluminum hydroxide, thus reducing the amount of precipitates. Using the method, scum is prevented from being generated by hydrogen gas. The final treated water has no color, and the settlement of sludge generated by electrocoagulation is enhanced.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a method (M1) of removing phosphorus from sewage wastewater by electrocoagulation, involving: providing an electrode assembly comprising an anode and a cathode with a porous membrane interposed between them; placing the electrode assembly in an electrocoagulation tank for treating sewage wastewater; passing sewage wastewater through the electrocoagulation tank to treat the sewage wastewater by electrocoagulation; and introducing the treated water, passed through the electrocoagulation tank, into a mixing tank to further treat the treated water; and    (2) an apparatus of removing phosphorus from sewage wastewater by electrocoagulation, comprising: an electrode assembly comprising an anode and a cathode with a porous membrane interposed between them; at least one electrocoagulation tank in which the electrode assembly is placed and sewage wastewater is treated by electrocoagulation using the electrode assembly; and a mixing tank, which receives the treated water from the electrocoagulation tank and in which the treated water passed through the anode and the treated water passed through the cathode are mixed with each other and further treated so as to remove phosphorus which was not treated in the electrocoagulation tank.