ZHOUHe-xi,ZHANGJin-song,ZHANGQing-pei.Discussion on Optimization of Multi-stage AO Process in a Wastewater Treatment Plant under High Discharge Standards[J].China Water & Wastewater,2022,38(20):8-13.
Discussion on Optimization of Multi-stage AO Process in a Wastewater Treatment Plant under High Discharge Standards
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第20期
Page:
8-13
Column:
Date of publication:
2022-10-17
- Keywords:
- wastewater treatment plant; multi-stage AO process; high discharge standards; operation and management optimization
- Abstract:
- A multi-stage AO process was adopted in a wastewater treatment plant in Shenzhen while the effluent quality met the first level A criteria of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). With the further development of urban water environment management, the effluent discharge standards require further improvement to meet the quasi-class Ⅳ criteria of Environmental Quality Standard for Surface Water (GB 3838-2002). The operation data in the past year indicated that the effluent concentrations of COD, BOD5 and SS could meet the quasi-class Ⅳ criteria for surface water. The NH4+-N, TN and TP concentrations of the effluent could basically meet the standards, and the standard compliance rates were above 80%. This paper proposed to optimize the operation management to meet the requirements of high discharge standards based on the actual operation effect and combined with the potential of the existing facilities. Specific optimized measures were as follows: the target values of ammonia in the precise aeration control system were set at 0.5-1 mg/L; the influent distribution ratio was 1∶1∶1/5∶3∶2 by precise measurement; the internal reflux ratio of the third stage was 50%; the dosages of chemical phosphorous removal were 35-40 mg/L; the sludge retention time of biological phosphorous removal was 19.3 d. The measures have been taken into project scheme for upgrading the wastewater treatment plant, which will guide the next upgrading work.
Last Update:
2022-10-17