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

摘要

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 step 4) into a sewage biological nitrogen and phosphorus removal reactor (4) for nitrogen and phosphorus removal. The method increases the nitrogen and phosphorus removal rate to around 80% and 95%, and enables the effluent discharged after sewage treatment to meet the first level standard A of the sewage discharge standards, and also has advantages of easy process control, less production of greenhouse gas and sludge, and low transformation process cost, and the like.