TIAN Min,CUI Tao,LU Kai,et al. Denitrification Performance Evaluation of A2/O Process in Xi’an Fourth Wastewater Treatment Plant [J].China Water & Wastewater,2020,36(13):1-6.
西安市第四污水处理厂A2/O工艺的脱氮性能评价
- Title:
-
Denitrification Performance Evaluation of A2/O Process in Xi’an Fourth Wastewater Treatment Plant
- Keywords:
- A2/O process; biological nitrogen removal; secondary sedimentation tank; endogenous denitrification
- 摘要:
-
通过对西安市第四污水处理厂A2/O工艺中生物反应池（厌氧池、缺氧池、好氧池）以及二沉池中氮的组分及污泥硝化活性的测定，评价A2/O工艺的脱氮性能。结果表明，二沉池作为A2/O系统的分离单元，对总氮去除的贡献率高达13%~60%，脱氮机理主要是内源反硝化；污泥浓度对TN去除效果具有重要影响，当污泥浓度较高时，TN平均去除率为89%，当污泥浓度较低时，TN平均去除率为69%。二沉池中的内源反硝化脱氮可为我国城市污水处理厂高效生物脱氮工艺的设计、运行及提质增效提供参考。
- Abstract:
-
In order to evaluate the denitrification performance of A2/O process in Xi’an Fourth Wastewater Treatment Plant, the nitrogen components and nitrification activity in the biological reaction tanks (anaerobic tank, anoxic tank and aerobic tank) and secondary sedimentation tank were determined. As the separation unit of the A2/O process, the secondary sedimentation tank contributed as high as 13%-60% of the TN removal, and the removal mechanism was endogenous denitrification. Sludge concentration had an important influence on the TN removal. When the sludge concentration was high, the average TN removal rate was 89%;when the sludge concentration was low, the average TN removal rate was 69%. The endogenous denitrification process in the secondary sedimentation tank can provide an important reference for design and operation of efficient biological nitrogen removal process and the improvement of effluent quality and treatment efficiency of WWTPs.
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