Research Of SBR Wastewater Treatment Mathematical Model Based On ASM2D

In recent years,China has vigorously developed the environmental protection industry,and the sewage treatment has been highly valued.At present,many sewage treatment plants have been established throughout the country.But the current sewage treatment plant adopts the traditional sewage treatment process,which lacks scientific and rational approaches to management and operation,and the degree of automation of which is low,with the operation data and operation experience difficult to share in a timely manner.Once the sewage plant has undergone rapid changes in water quality,the sewage treatment plant will not be able to provide a rapid and accurate coping mechanism,and it is difficult to reduce the damage caused by water quality changes in a short period of time.Based on the SBR model,a ASM2 D coupling model that can accurately simulate and predict water quality change is built on the basis of ASM2 D model in Songhua River basin.With the software platform,the simulation and orthogonal test analysis,combined with the principle of energy saving and emission reduction,determine the optimum working conditions of SBR process under the condition of low C/N wastewater.Based on the ASM2 D model,this paper coupled the biological phosphorus removal metabolic model,increasing the XGLY component,and introduced the switching function into the kinetic equation to form a new coupling model.Through the characteristics of SBR reaction,the equation of material conservation is established and programmed in Biowin software platform.Establish ASM2 D coupling model and write it on the software platform.After the sensitivity analysis of ASM2 D coupling model on COD,ammonia nitrogen,total nitrogen,total phosphorus,the important parameters are bH、kgly、fSi、Yxglyo2、iN,XS、i N,BM、YA、iN,BM、μA、Ypha、Ypo4、Yxhpano3、Yxglyno3.Correction of each parameter adjustment by controlling variables,Ypo4 changed from 0.35 to 0.70,Yxhpano3 from 1.58 to 1.896,Yxglyno3 from 1.33 to 1.064,Ypha from 1.33 to 1.596,μA from 1 to1.2,f Si from 1 to 0.9,bH from 0.4 to 0.2,iN,BM is still 0.07,YAwill be adjusted from 0.24 to 0.18,Yxglyo2 from 1.25 to 0.30,iN,XS from 0.04 to 0.20.Through the adjustment of the model,The simulated errors in the COD,ammonia nitrogen,total nitrogen and total phosphorus were 1.87%,1.53%,2.31%,2.27%.,And the model can meet the requirements in the simulation of parameters of the water quality,basically accorded with the actual situation of the operation of SBR process.According to the parameters affecting SBR process(such as the sludge concentration,hypoxia,HRT,flushing ratio,temperature),we carried on the dynamic simulation of SBR process and combined with the analysis of orthogonal test results to determine the optimal conditions of low C/N SBR operation of the sewage.And Theoptimum condition is the ratio of flushing to water is 1/8,HRT=8,the anoxic time is1.5h,the sludge concentration is 3000mg/L,the temperature is 20℃.On the basis of the optimum conditions to do the water quality analysis,The influent C/N six 2,3,4,5,6,8 of water were explored.the research shows that the optimum conditions can be a good response to the change of the water quality,and the ASM2 D coupling model can also play a very good prediction effect to realize the guiding role for the sewage treatment plant.