Research On Treatment Of Wastewater By Improved Membrane Bio-reactor

Membrane bio-reactor(MBR)features many other advantages of the traditional processes, which makes it a highly attractive system with a bright outlook. However, this new type of wastewater treatment system still need further improvement for a more widespread application. The main hindrances are the elevated energy consumption and the membrane pollution. Therefore, we fell to designing a new type of jet-aeration-MBR, which substituted the blowing machine and obviates the suction pump. Through the last 220 days in the laboratory-scale pilot study of this new MBR system in dealing with synthetic wastewater as well as domestic sewage and observing the potential problems which may exist, we found aeration in different ways have significant influence on sludge characteristics thus affect the effluent quality . In dealing with domestic sewage and synthetic wastewater during the removal system CODCr more than 95% of NH3-N removal rate also remained at more than 95% nitrification at the same time to select the appropriate solution to return than when the removal rate of total nitrogen were higher than 70%, colorless and tasteless and the water turbidity is less investigations in our laboratory showed that the wipe off ratio of COD exceeded 95%; wipe off ratio of NH3-N exceeded 95%; and the turbid degree of the equit less than 1 NTU. Furtherrnore, under the combined influence of shear stress and the strong turbulence, sludge became very loose and fine, which seriously affected the status of the settlement of sludge performance, whereas, it is more conducive to reactor degrade of pollutants. The results proved obviously that the pollutant removal rates were higher by the way of using jet aerator rather than the blowing machine.