Experimental Study On Dynamic Membrane-moving Bed Biofilm Reactor

Membrane-moving bed biofilm reactor (M-MBBR) is a new type of bioreactor which combines biofilm process and membrane separation process. Firstly, reactor's structure was introduced, and the flowing characteristic and the microorganism growing on the two kinds of suspended carriers were compared; Then, the effect of hydraulic retention time, temperature and shock loading in influent water on the removal efficiency of contaminations was studied in this experimentation. Through analyzing the characteristic of the Membrane-moving bed biofilm reactor, the effect of adding the carrier was studied. Finally, it also achieved the aim of alleviating the fouling of the dynamic membrane reactor (DMBR) by adding the suspended carrier to the system as the media of biomembrane.The experiment results showed that the best dosing ratio of media to reactor should be 35% , it also indicated that the polypropene suspended carrier was better than the polyethylene carrier in hanging membrane. When the range of influent COD was 150~300mg/L, the HRT was 16h, the dosing ratio 35%, the temperature 25℃,the effluent turbidity was less than 10NTU, COD and NH3-N removal was stay at 80% and 75% respectively. Then, the HRTs of 13h, 14h, 16h and 18h were investigated to test the removal efficiency, and the result shows that the best removal efficiency appeared when the HRT was 16h. Also it was found that flux shock, COD and NH3-N concentration shock had little influence on the effluence quality of system, thus it implied that the system had high capacity of bearing shock loading. By adding the suspended carrier to the biomembrane at the dosing ratio 35%, the removal percentage of COD and NH3-N were increased to 81.59% and 75.95% respectively. It also found that by adding the suspended carrier to the membrane, the system had high capacity of removing efficiency and rejecting shock loading, the fouling of the DMBR system was alleviated, and the operation period was deduced.