The nitrogen and phosphorus removal and sludge yield comparative study under anaerobic/aerobic and anaerobic/anoxic conditions

摘要

The nitrogen and phosphorus removal efficiency and effect of different electron acceptors (O_2 and NO_3~-) on the sludge yield were studied through experiments in two SBRs (Sequencing Batch Reactors) in this paper. The results showed that two systems both had good decontamination effect; the theory value of sludge yield (It was 0.435 gVSS/gCOD and 0.402 gVSS/gCOD for anaerobic/aerobic and anaerobic/anoxic condition, respectively) was higher than the actual value (It was 0.335 gVSS/gCOD and 0.321 gVSS/gCOD for anaerobic/aerobic and anaerobic/anoxic condition, respectively); There was no significant difference for the sludge yield under anaerobic/aerobic and anaerobic/anoxic conditions, because the endogenesis respiration of sludge under anaerobic/aerobic condition was stronger consequently more sludge being attenuated (Attenuation coefficient was 0.0081 and 0.0026 for anaerobic/aerobic and anaerobic/anoxic condition, respectively).