A Study On Establish And Use Of Ultrafiltration Membrane Configuration Model For The Treatment Of Municipal Wastewater

To recycle wastewater was a hot point in the field of water treatment, because that membrane separation techniques have the following virtues: low energy consumption, simple operation, good water quality, and stability, etc. A major obstacle to these applications is the permeate flux decline to concentration polarization and fouling. Particle capture at membrane surfaces in cross-flow ultrafiltration is studied experimentally and computationally to better understand permeability reduction as function of membrane pore sizes and particle sizes and concentrations. During cross-flow ultrafiltration, residual organic matters are transported and eventually capture at the membrane surface and in the pores of membrane causing pore blocking and gradual fouling and consequent permeability reduction. This study adopts the scanning electron microscope, the field emission scanning electron microscope and permeability rate method to determine Ultrafiltration configuration parameter such as surface pore size distribution, porosity, pore density and so on. The results also showed that the data of pore density obtained from SEM and FESEM are basically consistent, but the data of mean pore radius are different. Permeation method was adopted to examine the results from both electron microscopes, but its results were different from both. In order to reduce the error, using the mean values of the parameters calculated from the SEM, FESEM and permeation method, this study established a model between permeation flux and membrane parameters including the mean pore size and pore density, and discussed the calculation method of factor a1 affecting pore density and factor a2 affecting mean pore size(1) the scanning electron microscope (SEM), the field emission scanning electron microscope (FESEM) and permeability rate method to determine Ultrafiltrationconfiguration parameter such as surface pore size distribution, porosity, pore density and so on. The results also show that the data of pore density obtained from SEM and FESEM are basically consistent(2) All values of configuration parameters such as the porosity, pore density, mean pore radius, pore size distribution and thickness parameters of asymmetric ultrafiltration membranes have been determined by mean of FESEM image analysis, SEM image analysis and permeation rate method. It should take many places of the same membrane to carry on the measurement to acquire average values.(3) This study discussed pollute mechanism characteristic of membrane and establish a pollute mechanism model between permeation flux and membrane parameters including the mean pore size pore density:and a1 (affecting factor of pore size ) and a2 (affecting factor of pore density)(4) This study calculated the values of factor a1 affecting pore density and factor a2 affecting mean pore and discussed the simulation curve of permeate flux of the experiment and the model(5) the simulation curve was calculated by means of the model above and a1 and a2. the permeate flux of the experiment was agreement with the predicted flux of the model.