Abstract
This work aimed at revealing the distribution and transformation of phosphorus (P) -containing substances in a combined oxidation ditch (OD)-membrane bioreactor (MBR). During the operation, it was found that P mainly occurred in microbial cells, followed by extracellular phase and the least in aqueous phase. The primary P fraction in the bioreactor was inorganic phosphorus (IP), in which non-apatite inorganic P (NAIP) accounted for the major ratio, comprising 57–73% of IP. The values of P uptake and release rate attained a low value after operating for 40 days with no sludge discharged. The relative proportion of Poly-P identified by 31P NMR declined obviously after long-term operation without discharging sludge, revealing lower bioactivity of PAOs in the OD-MBR. In terms of maintaining a stable P-removal efficiency, an MBR should discharge excess sludge at a suitable time point by comprehensively considering the relative values of PUR&PRR, and the proportion of Poly-P.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
