TANG Xia,LI Jiang-peng,SHEN Yun,et al.A Pilot Test on Upgrading and Reconstruction of Municipal Wastewater Treatment Plant Based on A2O-MBBR Process[J].China Water & Wastewater,2021,37(11 11):52-57.
A Pilot Test on Upgrading and Reconstruction of Municipal Wastewater Treatment Plant Based on A2O-MBBR Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
11 11
Page:
52-57
Column:
Date of publication:
2021-06-01
- Keywords:
- municipal wastewater treatment plant; upgrading and reconstruction; A2O-MBBR process; insufficient carbon source; shock load
- Abstract:
- A wastewater treatment plant has the problems of insufficient carbon source, strong shock load, limited footprint area and so on. A2O-MBBR process was proposed to upgrade the existing process, and a pilot test was carried out. When the average C/N ratio of influent was less than 3, the average concentrations of COD, NH3-N, TN and TP in effluent of the biochemical tank were 14.4 mg/L, 0.24 mg/L, 5.93 mg/L and 0.25 mg/L, respectively, and the TN removal efficiency increased by 27.2% compared with that of the existing process. When the flow rate of the influent increased by 1.4 times, the average values of COD, NH3-N, TN and TP in the effluent were 9.9 mg/L, 0.56 mg/L, 6.17 mg/L and 0.2 mg/L, respectively. When the dosage ratio of landfill leachate was 0.1%-0.4%, the average values of COD, NH3-N, TN and TP in the effluent were 18.1 mg/L, 0.57 mg/L, 8.05 mg/L and 0.2 mg/L, respectively. The relative abundance of nitrifying bacteria and denitrifying bacteria on suspended carriers was 13.32% and 14.29%, respectively. The coexistence of nitrifying bacteria and denitrifying bacteria provided micro-guarantee for the occurrence of simultaneous nitrification and denitrification. Therefore, the MBBR process enhanced the nitrogen and phosphorus removal capacity of the system, and significantly improved shock resistance performance of the system.
Last Update:
2021-06-01