ENHANCED SEWAGE BIOLOGICAL NITROGEN AND PHOSPHORUS REMOVAL METHOD BASED ON POLYHYDROXYALKANOATES METABOLIC REGULATION

An enhanced sewage biological nitrogen and phosphorus removal method based on polyhydroxyalkanoates metabolic regulation, the method comprising the following steps: 1) passing the sewage through a primary sedimentation tank (3) to obtain granular organic substance, and importing the obtained granular organic substance together with the surplus sludge discharged from a secondary sedimentation tank (5) into a sludge thickening tank (6) for thickening; 2) anaerobically fermenting the thickened organic waste obtained from step 1) in a polyhydroxyalkanoates precursor production reactor (9) to synthesize a polyhydroxyalkanoates precursor; 3) after removing nitrogen and phosphorus from the anaerobically fermented mixture in a sludge conditioning tank (10), pumping the liquid into a polyhydroxyalkanoates precursor storage tank (11); 4) pumping the polyhydroxyalkanoates precursor into the polyhydroxyalkanoates production reactor (9) to produce polyhydroxyalkanoates; 5) pumping the polyhydroxyalkanoates produced in ste