| MBR attracted much attention these years as a new and efficient water treatmenttechnology, Has great advantages and application prospect. Combination the traditionalbiological treatment process with membrane separation technology, to realize therecycling of municipal wastewater, is the most commonly used technology to treatmentsewage. But it exists a lot of problems in the traditional biological treatment process,and as the membrane is the core of the MBR system. It’s life and the fouling rate is veryimportant to the MBR system. So it is very important to improve the MBR process anddevelopment a Low cost and high performance membrane.This paper mainly studied the PVDF-PET woven tubal hollow fiber compositemembrane were prepared using PET woven tubal for support layer, PVDF for film basematerial and PVA for hydrophilization modifiers. The effect of the parameters of woventube, PVA concentration in casting solution on membrane performance and the relevantproperty on filter municipal secondary effluent were investigated. Analysis themembrane surface and the cross section structure, evaluation of membrane water flux,average pore diameter and porosity, flux attenuation speed, and through theinvestigation of modified composite membrane for secondary water particles andorganic matter removal efficiency, optimize it is concluded that the optimal ratio ofconcentration. Get the optimal ratio of the concentration. Production shade typemembrane module use homemade composite membrane, then formation inverted A2/OMBR system to treatment simulated sewage in normal temperature. Investigatedremoval efficiency of COD, NH3-N, TN, TP, the variation of the TMP and the change ofthe membrane performance. From the macroscopic and microcosmic analysis the main factors of membrane fouling. Provide a reference for the sewage plant rebuilding.The results of the study are as follows:（1） when outside diameters（OD）of the PET woven tubal is increased or the meshis decreased, the water flux and average pore diameter of composite membraneincreased dramatically, while the porosity decreased. When OD was2.1mmmesh was45, the water flux was1516L·m-2·h-1, the porosity attained61.6%.And with the increase of PVA concentration, the water flux, average porediameter and the porosity of composite membrane increased, meanwhile theholes in the surface of composite membrane from tiny to large. When PVAconcentration was4%，the composite membrane shown the best performance.（2） The inverted A2/O MBR system has good removal efficiency for urban sewage.COD, ammonia nitrogen and total phosphorus removal effect is good at thecondition of different reflux ratio. Respectively above90%、95%、80%. Whenthe reflux ratio at100%, the removal efficiency of total nitrogen is low, butwhen it between100%-300%, with the ratio increase, the removal efficiencyrise. In the process of operation, although the membrane operation at flux12±0.5L·m-2·h-1, the TMP keep under8kPa, The study showed thathomemade composite hollow fiber membrane can operation at high flux andlow pressure in membrane bioreactor, which has a good ability to resistpollution and showed a good effect on particles rejection.（3） Analysis about the performance of the membrane fouling shows that the looseEPS contribution the biggest effect on membrane organic pollution, at the sametime, through the AMF microscopic analysis, the adhesion force between LBand membrane is the maximum.（4） Analysis about the environment changes in the reactor shows that Membranefouling rate is closely related to the micro reactor environmental change, theresults showed: in the process of running, the membrane fouling rate is close toreactor micro environmental changes, and different operating conditions ofmembrane pollution rate is different, but are smaller. |
PDF Full Text Request