Continuous flow sewage hypoxia short distance denitrification treating technique

[0023] Embodiment 1: The present invention has been applied to the technical research on upgrading and transforming sewage treatment process of a certain sewage treatment plant. The influent water quality of the sewage treatment plant is: COD 100-245mg / L, ammonia nitrogen 15-25mg / L, total nitrogen 20-35mg / L, and total phosphorus 1.0-4.0mg / L. The present invention sets the hydraulic retention time of anaerobic zone 2 to 1.0 hours in this project, which is the anaerobic phosphorus release section; the hydraulic retention time of anoxic zone 3 is 5.0 hours, and the actual hydraulic retention time is greater than this value due to the adoption of a circulating push-flow system , mainly for short-range nitrification and denitrification; the hydraulic retention time of aerobic zone 4 is 5.0 hours, and further nitrification reaction is carried out, while organic matter degradation and excessive phosphorus uptake by phosphorus-accumulating bacteria are carried out; the sludge reflux ra...

[0024] Embodiment 2: The present invention is applied to the productive process technology research of a sewage treatment plant in the south. The influent water quality of the sewage treatment plant is: COD 100-150mg / L, ammonia nitrogen 15-20mg / L, total nitrogen 20-35mg / L, and total phosphorus 1.0-4.5mg / L. The present invention sets the hydraulic retention time of anaerobic zone 2 in this project to be 1 hour, which is an anaerobic phosphorus release section; the hydraulic retention time of anoxic zone 3 is 4.0 hours; the hydraulic retention time of aerobic zone 4 is 4.0 hours, and further carries out nitrification Reaction, simultaneous degradation of organic matter and excessive phosphorus uptake by phosphorus-accumulating bacteria; the sludge reflux ratio is 0.6, and the nitrification liquid reflux ratio is 1.0. After being treated by the process proposed by the invention, the effluent water quality reaches: COD 10-25mg / L, ammonia nitrogen 0.5-2.0mg / L, total nitrogen 10-20m...

[0025]Embodiment 3: The present invention has been applied to the upgrading and upgrading of a sewage treatment plant in the north in the research of sewage treatment technology. The influent water quality of the sewage treatment plant is: COD 210-460mg / L, ammonia nitrogen 15-35mg / L, total nitrogen 25-46mg / L, total phosphorus 1.0-5.0mg / L. In this project, the present invention sets the hydraulic retention time of anaerobic zone 2 to 1 hour, which is the anaerobic phosphorus release section; the hydraulic retention time of anoxic zone 3 is 6.0 hours, mainly for short-range nitrification and denitrification; the hydraulic retention time of aerobic zone 4 The time is 5 hours, the nitrification reaction is further carried out, and the organic matter degradation and phosphorus accumulation bacteria are excessively absorbed at the same time; the sludge reflux ratio is 0.8, and the nitrification liquid reflux ratio is 1.5. After being treated by the process proposed by the invention,...