| Constructed wetlands wastewater treatment system by natural ecological and hydrological processes,physical,chemical and biological function well together,thus enhances the ability of deal with pollutants.First,in this paper,by establishing a two-dimensional mathematical model of the undercurrent of artificial wetland,using fluid mechanics calculation software to study the undercurrent of artificial wetland different import position on its hydraulics performance;and at the same time,according to the existing data to study the resistance ratio on the hydraulic performance of different media.The results showed that:import position 10cm position in the upper medium layer medium subsurface constructed wetland,its hydraulic efficiency than the inlet position in the upper medium surface under high 15cm;On and lower medium,impact resistance through the comparison of subsurface flow constructed wetland hydraulics performance.Then,on the basis of existing data,to establish the mathematical model research level of degradation of pollutants,estimate the parameter values of the model,the influential factors of the model parameters are studied.The results showed that:the k-C*model is used to simulate the vertical subsurface flow constructed wetland system COD,TN,TP degradation kinetics effect is good,very good agreement.among them,Organic matter k-C*model parameter kA estimates is 0.1789m/d;the parameter of k-C*model kA TN estimates for 0.2285m/d;the parameter of k-C*model kA TP estimates for 0.024m/d.VFCW system of the removal rate of COD and TP removal rate are no obvious correlation with temperature,so the degradation of COD and TP k-C*in the model the degradation rate constant temperature correction coefficient theta are θ=1;TN removal rate are greatly influenced by temperature,so TN degradation of k-C*TN the degradation rate constant temperature correction coefficient theta in the model takeθ=1.0419.VFCW system of COD,TN,TP area removal constant kA and pollutant influent load has certain relevance,and decreases with the increase of influent load of pollutants.Finally,on the basis of existing data,discuss the different influence factors on the effect of COD,TP,TN removal research.The results showed that:different plant types,effect on the removal of subsurface flow constructed wetland is not obvious;the removal effect of subsurface flow constructed wetland was affected by season obviously,the whole summer,autumn better removal effect,spring,winter is the worst removal effect. |
