Study On The Mechanism Of Airlift Recriculated MBR

Using the novel X-flow tubular membrane module, we developed a novel airlift recirculated MBR, which combined some advantages of both external MBR and submerged MBR.Critical flux measurements were conducted on a constant flux basis while monitoring changes in TMP by using "stepwise method". As a result, three different operational zones for MBR operation could be suggested: supra-critical zone, critical zone and sub-critical zone. Further more, effects of the aeration intensity , MLSS and circulation flow-rate on critical flux were comprehensively analyzed and compared to identify the major factors influencing critical flux.A long-term operation of the MBR was conducted under sub-critical conditions. The effluent COD and NH₄⁺-N was superior to the standard of reclaimed water in China. The MBR has the latent capacity on removal of nitrogen and phosphorous.In the flux optimization experiment of the airlift recirculated MBR, we regulated the MBR operation factors which were the backwash rate, backwash time and temperature. As a result, the MBR operation flux were obviously improved as in the supra-critical zone.