Effect of aeration process on stability of denitrifying phosphorus removal system

摘要

The phenomenon of denitrifying can be found under the condition of anaerobic/anoxic(A/A) in the biological phosphorus removal. The results show that the ability of denitrifying phosphorus removal in the system of A/A-SBR is lower than the system of anaerobic/anoxic/aerobic-SBR(A/AO-SBR). Along with the time increasing in the system of A/A-SBR, the ability of phosphorus removal will weaken, and the system's sludge productivity will also decrease gradually from initial 0. 22 gMLSS/(gCOD·d) to zero or even minus. The key to make the system operate steadily is increasing the latter aerobic time. However, the longer aerobic time will result in the accumulation of NO3--N, and restrain the system of A/AO-SBR from removing phosphorus. The latter aeration for 0.5 h will ensure not only steady operation, but also good effect of phosphorus removal in the system of A/AO-SBR.