HEChun-qiu,ZHOUShao-qi.Simulation of Modified A2/O-MBR Process and Its Operation Optimization[J].China Water & Wastewater,2022,38(15):90-97.
Simulation of Modified A2/O-MBR Process and Its Operation Optimization
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第15期
Page:
90-97
Column:
Date of publication:
2022-08-01
- Keywords:
- modified A2/O-MBR process; low carbon source municipal wastewater; BioWin simulation; nitrogen and phosphorus removal; operation optimization
- Abstract:
- Conventional A2/O process has low removal efficiency of nitrogen and phosphorus in the treatment of low carbon source municipal wastewater. A pilot-scale modified A2/O-MBR process was thus designed and developed to enhance simultaneous nitrogen and phosphorus removal. The performance and stability of the system for the treatment of effluent from fine grids of a municipal wastewater treatment plant in Guangzhou were investigated. When COD, NH4+-N, TN, TP and SS in influent were 79-163 mg/L, 19.0-30.8 mg/L, 24.3-39.3 mg/L, 2.00-3.31 mg/L and 60-164 mg/L, respectively, the average COD, NH4+-N and SS in effluent were 9.09 mg/L, 0.38 mg/L and 1.13 mg/L, respectively. After increasing the circulation between anoxic tank and anaerobic tank, the removal efficiencies of TN and TP increased by 11.5% and 12.2%. A mathematical model of the process was established based on BioWin software, and the operating parameters were optimized by using the calibrated model. The best removal performance of pollutants was obtained when the following optimized parameters were adopted: nitrification liquid reflux ratio of 200%, anoxic mixed liquid reflux ratio of 150%, sludge reflux ratio of 100%, sludge age of 20 days, dissolved oxygen in aerobic tank of 1.25-1.75 mg/L and methanol dosage of 33 mg/L.
Last Update:
2022-08-01