Photoelectrocatalysis coupled autotrophic denitrification microorganism nitrogen and phosphorus removal process method

The invention discloses a photoelectrocatalysis coupled autotrophic denitrification microorganism nitrogen and phosphorus removal process method, and belongs to the technical field of sewage treatment. The method comprises the following steps: (1) adding a photocatalyst on cathode and anode reaction columns of a microbial electrochemical reactor, wherein the photocatalyst can degrade organic matters in domestic sewage into CO2 and H2O under natural light; (2) placing autotrophic denitrifying bacteria at the anode of the microbial electrochemical reactor, and placing algae at the cathode of themicrobial electrochemical reactor; and (3) injecting the domestic sewage into the microbial electrochemical reactor, and purifying the domestic sewage. A photocatalytic oxidation technology is combined with synchronous nitrogen and phosphorus removal of the algae, a light source is used for photosynthesis of the algae while a photocatalytic reaction is achieved, organic conversion of nitrogen andphosphorus is achieved, a