| 摘要: | This study was firstly aimed at investigating the performance of a laboratory scale submerged membrane bioreactor (MBR) for septic tank effluent treatment and subsequently the influence of landfill leachate addition on the system performance was also investigated. Finally, sponge pellets were imtroduced into MBR tank to conduct a hybrid MBR system for treatment of septic tank effuent/ landfill leachate mixed liquid. A long-tern operation of 308 days was divided into 8 stages to examine the HRT, S/L volume ratio and sponge pellets addition influences on parameters related to total chemical oxygen demand (TCOD) removal, nitrification, denitrification, color removal, metal removal and membrane cleaning. The results indicated that TCOD removals for the runs without leachate addition (septic tank effluent only) were higher than 90% and more than 80% of ammonia nitrogen was converted. However, it is apparent that the addition of landfill leachate would worse the removal of TCOD. The result of sponge-MBR showed that the TCOD removal was 79% and with an average TN removal of 51% for treament of septic tank effluent/landfill leachate mixed liquid. However, the conversation of ammonia nitrogen was down to 31%. This introduction of sponge pellet could significantly improve the permeability of MBR system for treatment of septic tank effluent/landfill leachate mixted liquid. It also revealed that the sponge pellet was with a strong capability to enhance the color removal in MBR system. The results showed that the removal efficiencies of metal Mg, Ca,Cr,Fe,Mn,Ni and Ba are 24.2%, 36.3%, 68.8%, 86.2%, 75.3%, 40.5%, 53.3%, respectively. Results of EDX spectra indicated that Zn can pass through the membrane and accumulate on the inner surface. |
