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.
城镇污水处理厂可调节式AAO工艺优化运行实践
- Title:
- Optimized Operation of Adjustable AAO Process in Urban Sewage Treatment Plant
- Keywords:
- adjustable AAO process; sewage treatment plant; step-feed process; pre-anoxic section; nitrogen and phosphorus removal
- 摘要:
- 针对日益严格的污水排放标准，对可调节式AAO工艺进行调整，研究多点进水和增设预缺氧段对脱氮除磷效果的影响。结果表明，多点进水工艺调整能够提高整个生物系统对碳源的利用能力，缓解了聚磷菌和反硝化细菌对碳源的矛盾和竞争，促进了缺氧段的反硝化作用，反硝化速率（以NO3--N计）可达6.78 mg/（gVSS·h），提高了TN去除率，达83%左右；增设预缺氧段能够有效提高聚磷菌在厌氧段的释磷作用，释磷速率（以PO43--P计）可达5.04 mg/（gVSS·h），释磷倍数高达9.57倍。可调节式AAO的优化运行能够有效地脱氮除磷，保障污水处理厂出水水质稳定达到“苏州特别排放限值”的要求。
- 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”.
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