Research On Stochastic Model Of Organic Concentration In Drainage Network Of A Town In Western Of Sichuan

In fact, the sewage pipe network is like a biochemical reactor, pipe network into the sewage in the flow process, the pollutant concentration in the water changes under the effect of complex physical, chemical, and biological.That will have an impact on their life, pipeline transportation efficiency and downstream of the sewage treatment plant operation. If we can grasp the changes of pollutants in sewage pipe network system, understanding the degradation of pollutants, will be conducive to regional sewage pipe network collection system and the design of the sewage treatment plant, make the processing ability of the whole wastewater treatment system more efficient.In this paper, based on the dynamics of activated sludge method as the theoretical basis, according to the law of conservation of mass, the deterministic model of organic concentration is established, on this basis, considering the effect of uncertainties, over stochastic process theory and methods, then establish a stochastic model of organic matter concentration. And the parameters in the model are analyzed, get the relative sensitivity of the model to the size of each parameter.Select a town of Xindu District of Chengdu as the object of study, the BOD5is chosen as the index of concentration of organic compounds, Using the measured water pipe network water quality data, respectively for organic matter concentration in the deterministic model and stochastic model to calculate. Through the Origin software, the calculation results are compared with measured water quality model. The results show that:compared with the deterministic model of organic concentration, the simulation results of organic matter concentration stochastic model can not only reflect the average response system state, but also better reflects the changes in the disturbance in the water at different times and more consistent with the measured values.Therefore, the concentration of organic matter stochastic model established in this paper can more accurately reflect changes of the concentration of organic matter in the sewage pipe network in the value of the town at different times. In this way, not only can more clearly understand the operation of the network condition, but also can provide guidance for the stable operation of the downstream sewage treatment plant according to the concentration of pollutants in the pipe network.