Analysis On The Material Balance Of Nitrogen Removal In A Certain Sewage Treatment Plant

Biological nitrogen removal technology is currently the most widely used wastewaternitrogen removal technology, to achieve nitrogen removal by nitrifying bacteria anddenitrifying bacteria. Under the strict requirements and the development trend of the currenturban wastewater nitrogen and phosphorus removal treatment, based on the ways andmechanisms of carbon and nitrogen cycles and urban wastewater nitrogen removal process,combined with specific urban wastewater nitrogen and phosphorus removal process andcontrol conditions and parameters, to explore city sewage biological treatment that part ofeach functional area a series of reactions, as well as the degree of response, to determine themain pharmacokinetic parameters of the kinetic model, and then as a system to optimize thedesign and operation of the data, that is, high efficiency, low nitrate removal phosphorusprocess applications to provide technical support.A city sewage treatment plant inverted A²/C oxidation ditch process run data andprocess monitoring data from each functional area and the overall balance analysis of carbonand nitrogen materials such as nitrogen and phosphorus removal process, and dynamic modelparameters to determine the denitrification process, the main conclusions are as follows:（1） Of the four functional areas of a wastewater treatment plant biological treatment partof the material balance analysis. Drawn through the carbon, nitrogen and phosphorus materialbalance calculation, the actual operation of the balance of the three percentages were93.90%,85.36%and86.33%. COD removal rate of91%removal occurred mainly in the aerobic zone,accounting for47.75%of the total COD removal; of TN removal rate was67.4%, mainly toremove is the total removal in the anoxic75%of NH₃-N removal efficiency of83%, mainlyin the aerobic zone is removed, the total removal of74.25%; phosphorus release occursmainly in the anaerobic zone, phosphorus absorption occurs mainly in the aerobic zone, thephosphorus removal efficiency of88%.（2）10days of the main bioreactor denitrification process data analysis and calculation,using the least squares method to determine the denitrification process-ammonification,nitrification, denitrification model kinetic parameters of value.（3） Due to the sewage plant effluent ammonia can not achieve an A standard, analyze thecauses and recalculate and adjust the oxidation ditch aerobic segment and the anaerobicvolume ratio of4:1, the SRT was12days and3days.