3.1. Performances of the DMBRThe detailed performances of the DMBR treating the septic tankwastewaterwereshowninFigs.2and3.Duetothehighcon-centration of NH4+–N and low ratio of COD/TN in the influent, the DMBR, in the stable operation period, just reached the average COD and NH4+–N removals of 40% and 60%, respectively, and generated the effluent of COD and NH4+–N of more than 150mg/L and 80mg/L, respectively, during the experimented HRT run of 9.0h and temperature of 20–26 ◦C. As shown in Fig. 4, neither the aims of SND in the DMBR were realized very well, although the nitrite of high concentration in the effluent implied the possibility of realizing shortcut nitrification and denitrication by improving the processing indexes. 3.2. Performances of the A/O/DMBR
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