Discussion of the Simultaneous Nitrogen and Phosphorus Removal Mechanism

Abstract:

The phosphorus uptake rate characteristics have been investigated in different electron acceptor conditions (NO3-, O2, O2 and NO3- coexisting). The sludge was transferred from CAS, AO MBR, AOA MBR, A2O MBR or the A, B tank of MUCT-MBR systems. The results show that the phosphorus uptake rate (SPUR) have the same rule for the sludge in different electron acceptors, that is NSPUR (NO3- as the electron acceptor) <ASPUR (O2 as the electron acceptor) <TSPUR (both O2 and NO3- as the electron acceptors). There exists the aerobic denitrifying phosphorus removal process in mixed electron acceptor system. And this process shows a positive correlation with the ability of denitrifying phosphorus removal improved. The higher ability of denitrifying phosphorus uptake the sludge have, the faster nitrate consumption rate could be shown through the phosphorus uptake process under the condition of in O2 and NO3- coexisting. That is TSDNR（AO）<TSDNR（AOA）<TSDNR（A2O）. The relationship between the nitrate consumption rates is ASDNR (only O2 exist) <TSDNR (TP and O2 coexist) <NSDNR (only TP exist). The phosphorus removal mechanism might include three parts: the aerobic phosphorus uptake, the anoxic denitrifying phosphorus uptake and the aerobic denitrifying phosphorus uptake.

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 2156-2159
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.2156
• Online since: August 2013
• Authors: Jing Ni Xiao, Li Na Zheng, Lei Zhang, Han Min Zhang, Feng Lin Yang
• Keywords: Aerobic Denitrifying, Biological Phosphate Removal, Denitrifying Phosphorus Uptake, Electron Acceptor, Membrane Bioreactor (MBR)

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