Analysis On The Process And Dynamics Of Short-cut Nitrification And Denitrifying In A~2/O~2 Process For Treating Nitrogenous Fertilizer

In this thesis, we took the actual intake of a sewage treatment plant of a nitrogenous fertilizer factory in Henan Province as our study object, samplied from each area and return sludge canal of the biological reaction pool every day, determinated the TN,ammonia nitrogen,NO3--N,NO2--N,MLSS/MLVSS,CODCr, COD and TN in sludge,at the same time on-site examination operation index such as Dissolved Oxygen(DO),pH,ORP and T.According to the monitoring data, this thesis analyzed the nitrogen removal process on the A2/O2 system, analyzed the short-cut nitrification process mainly. We established dynamics model about short-cut nitrification and short-range denitrification. Finally we can drew the following conclusion:(1)In A2/O2 system, TN balance ratio was 90.26%, COD balance ratio was as high as 97.58%, In microaerobic area, the average nitrite accumulation ratio could reach 60.29%.(2)There is must be ammoniation,anaerobic ammonium oxidation process exist in this area; anaerobic ammonium oxidation process and ammoniation were found in anaerobic tank; In microaerobic area, there was a short-cut nitrification,aerobic denitrification and simultaneous nitrification and denitrification; Aerobic area must exist SND and aerobic denitrification process.(3)Short-cut nitrification dynamic model can be expressed by Monod equation: several dynamics parameters were gained, vmax=1.20mg·gVSS-1·h-1, Ks =5.25mgNH4+-N·L-1.we use double-base qualitative Monod model to describe short-cut denitrifying dynamics: several dynamics para-meters were gained, vmax=0.00066 mgNO2--N-mgVSS-1·h-1, KN=1.28mg/L Ks=41.2mg/L...