LICheng,GUOZhi-han,HUANGHui-min,et al.Start-up Characteristics of Denitrifying Phosphorus Removal Process and Effect of Nitrite Concentration[J].China Water & Wastewater,2023,39(11):8-14.
Start-up Characteristics of Denitrifying Phosphorus Removal Process and Effect of Nitrite Concentration
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第11期
Page:
8-14
Column:
Date of publication:
2023-06-01
- Abstract:
- A sequencing batch reactor (SBR) single sludge system fed with simulated domestic wastewater was operated through three stages of A/O, A/A/O and A/A process. The start?up conditions of denitrifying phosphorus removal process and the influence of nitrite concentration on the start-up were investigated. Sodium propionate was an ideal carbon source for denitrifying phosphorus-removing bacteria (DPBs). By controlling short sludge retention time (SRT) to promote the growth of phosphorus accumulating bacteria (PAOs) and extending SRT to 25 days to enrich DPBs, the denitrifying phosphorus removal process was successfully started after 45 days of operation, and the removal rate of PO43--P was always more than 80%. After successful start-up, the proportion of DPBs in PAOs increased from 28.5% to 75.8%. After the enrichment of PAOs, the concentration of available electron acceptor (NO2--N) was only 4 mg/L, and phosphorus absorption was inhibited when NO2--N reached 8 mg/L. However, after the enrichment of DPBs, the threshold of NO2--N inhibition increased to 12 mg/L, and the net phosphorus uptake was only 8.58 mg/L.
Last Update:
2023-06-01