MAJiu-li,WANGWei,HUANGJi-hui,et al.Optimized Operation of Adjustable AAO Process in Urban Sewage Treatment Plant[J].China Water & Wastewater,2023,39(17):70-73.
Optimized Operation of Adjustable AAO Process in Urban Sewage Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第17期
Page:
70-73
Column:
Date of publication:
2023-09-01
- Keywords:
- adjustable AAO process; sewage treatment plant; step-feed process; pre-anoxic section; nitrogen and phosphorus removal
- Abstract:
- This paper modified the operation of an adjustable AAO process to investigate the influence of step feed and setting of pre-anoxic section on nitrogen and phosphorus removal performance in response to increasingly stringent sewage discharge standards. The adjustment of the step-feed process improved the utilization capacity of carbon sources of the entire biological system, alleviated the contradiction and competition between phosphorus-accumulating bacteria and denitrifying bacteria for carbon sources, and promoted the denitrification efficiency in the anoxic section. The denitrification rate (measured by NO3--N) reached 6.78 mg/(gVSS·h), and the TN removal rate increased to approximately 83%. The setting of pre-anoxic section effectively improved the phosphorus release of phosphorus-accumulating bacteria in the anaerobic section. The phosphorus release rate (measured by PO43--P) reached 5.04 mg/(gVSS·h), and the phosphorus release multiple was as high as 9.57 times. The optimized operation of the adjustable AAO effectively removed nitrogen and phosphorus, and ensured that the effluent quality of the sewage treatment plant stably reached the requirement specified in the “Suzhou Special Discharge Limit”.
Last Update:
2023-09-01