Stimulation Based On Simulink For Nitration And Denitrification Reaction Kinetics Model

With the development of people’s living level，the domestic and productive wateris increasing gradually. The pollution of nitrogen in water is becoming seriously. Theimportance and attention of domestic sewage treatment technique is getting higherand higher, especially the urban sewage treatment process. due to dispersion degree ishigher, urban sewage water volume quality change is big, water is small, itsprocessing was once become a difficult problem in the field of water treatment, theresearchers has been committed to research and water development of new watertreatment technology. This paper briefly describes the present situation of waterresource in China, the prominent problems of water resources and major waterpollution incidents in recent years and its harm to People’s Daily lives, and discussesthe current several principle and application of sewage treatment process, bycomparing the various advantages and disadvantages and applicability of sewagetreatment process, finally selects the SBBR shortcut nitrification-denitrificationprocess sewage.In this experiment,three groups SBBR reactor were employed to treat thesimulated domestic wastewater,and the comparison of growing environmental factorswere investigated among the ammonium-oxidizing bacteria（AOB）、nitrite oxidizingbacteria（NOB）and denitrifying bacteria by reaction kinetic model.The biochemicalreaction of ammonia oxidizing bacteria、nitrate oxidation bacteria and denitrifyingbacteria was predicted by utilizing the simulation dynamics model based onSIMULINK. The results indicated that it could accurately predict the bio-process ofAOB and NOB in treating sanitary sewage treatment when dissolved oxygenconcentration, alkalinity and temperature on the model were chosen appropriately.The absolute average error of simulation values of NH4+-N、NO2--N and NO3--N wereranging from1.13to15.88. In addition, the Nash.Suttcliffe simulation efficiencycoefficient of NH4+-N、 NO2--N and NO3--N were99.36%,98.6%and 99.25%,respectively. The sensitive analysis of dissolved oxygen concentration,alkalinity and temperature on this model, which were also discussed, shows that thesensitivity of temperature was bigger than dissolved oxygen and was much biggerthan alkalinity.The results indicated that it could accurately predict the bio-process ofdenitrifying bacteria in treating sanitary sewage treatment when dissolved oxygenconcentration, alkalinity and temperature on the model were chosen appropriately.Theabsolute average error of simulation values of NO2--N and NO3--N were ranging from2.28to26.07. In addition, the Nash.Suttcliffe simulation efficiency coefficient ofNO2--N and NO3--N were76.8%and82.3%,respectively.The sensitive analysis ofdissolved organic compound, alkalinity and temperature on this model, which werealso discussed, shows that the sensitivity of temperature was bigger than dissolvedorganic compound and was much bigger than alkalinity.In order to provide the reference and theoretical guidance for online monitoringof the shortcut nitrification-denitrification, denitrification kinetic model was built bySIMULINK,combined with nitrification kinetic model.