Abstract
The cost performance index (CPI) of a wastewater treatment plant operating with multimode anaerobic/anoxic/oxic (AAO) system was calculated based on effluent quality, sludge production and energy consumption using a mathematical model. The multimode AAO system could be operated under three modes: AAO, reversed AAO (RAAO) and anoxic/oxic (AO), and CPI for each mode was studied and compared. On the promise of similar operation costs, the AAO mode showed higher pollutants removal efficiency and concentration of phosphorus-accumulating organisms than RAAO and AO modes at sludge retention time of 5~25 d. The optimal operation parameters and qualified operational region under discharge standard restraint were established for the AAO process by regulating recirculation ratios. Dynamic simulation results showed that under optimized operating condition, effluent quality was significantly improved with percentage of violation decreased from 78.4% to 37.7%, and the CPI index was reduced by 3.9%.
| Original language | English |
|---|---|
| Pages (from-to) | 1734-1739 |
| Number of pages | 6 |
| Journal | Zhongguo Huanjing Kexue/China Environmental Science |
| Volume | 34 |
| Issue number | 7 |
| State | Published - Jul 2014 |
| Externally published | Yes |
Keywords
- Activated sludge
- Anaerobic/anoxic/aerobic process
- Mathematical model
- Optimization
- Wastewater treatment
