Simultaneous and Efficient Removal of Nitrogen and Phosphorus by Fast-Start Denitrifying Phosphorus Removal System in Anaerobic-Oxic-Anoxic Operation Mode

Abstract

Realizing the quick enrichment and development of denitrifying phosphorus accumulating microorganisms (DPAOs) in actual household wastewater and industrial nitrate wastewater has significant research significance. In this study, a novel operation mode of anaerobic-oxic-anoxic (AOA) was adopted to successfully realize the enrichment and cultivation of DPAOs in urban domestic wastewater by means of regulating the operation parameters such as influent C/P and aerobic operation parameters. The system was operated for 180 days and the DPAOs were well enriched during the stable operation stage the percentage of Dechloromonas increased to 5.1%. Therefore, the effluent PO43--P was <0.3 mg P/L, the removal efficiency of phosphate was 96.9% and the removal efficiency of nitrate was 92.5%. This study provides a new and efficient method for the domestication and cultivation of DPAOs.

Keywords: Municipal wastewater, Denitrifying phosphorus removal, AOA operation, Denitrifying phosphorus accumulating microorganisms, Endogenous denitrification