FENG Hong-li,ZHAO Meng-yue,DING Shu-zhe.Optimal Control of Biological Nitrogen Removal in A2/O Process of WWTP[J].China Water & Wastewater,2021,37(6 6):102-106.
Optimal Control of Biological Nitrogen Removal in A2/O Process of WWTP
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
6 6
Page:
102-106
Column:
Date of publication:
2021-03-17
- Keywords:
- A2/O process; biological nitrogen removal; aeration rate; internal reflux ratio; carbon source; optimal control
- Abstract:
- In view of the problems such as high aeration consumption and high consumption of external carbon source in the operation process of a municipal wastewater treatment plant (WWTP), the ammonia nitrogen concentration along the aerobic tank, the influent and effluent total nitrogen concentrations, nitrate nitrogen and COD concentrations at the end of the anoxic tank in the A2/O process were analyzed as the objects to optimize its biological nitrogen removal process. Firstly, the aeration rate of the aerobic tank was adjusted according to the ammonia nitrogen concentrations along the aerobic tank to optimize the nitrification process. Then the internal reflux ratio was adjusted according to influent and effluent total nitrogen concentrations, and the external carbon source dosage is adjusted according to the nitrate nitrogen and COD concentrations at the end of the anoxic tank. The results indicated that taking the optimal control strategy of biological nitrogen removal process mentioned above, the aeration rate of a 5×104 m3/d municipal WWTP was reduced by 50% during actual operation, and the external carbon source dosage was reduced by 74%, which can still reach the discharge standards.
Last Update:
2021-03-17