LIXiao-chuan,YANHao,YUANQuan,et al.Analysis on Denitrification Mechanism of Double-SRT Hybrid Denitrification Process for Municipal Wastewater Treatment[J].China Water & Wastewater,2023,39(9):10-17.
Analysis on Denitrification Mechanism of Double-SRT Hybrid Denitrification Process for Municipal Wastewater Treatment
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第9期
Page:
10-17
Column:
Date of publication:
2023-05-01
- Keywords:
- municipal wastewater; Anammox; double?SRT; denitrification mechanism
- Abstract:
- The double-SRT (sludge retention time) hybrid denitrification process based on partial anaerobic ammonia oxidation (Anammox) can realize the coupling of autotrophic denitrification and heterotrophic denitrification, which shows good application potential in low-cost and high-efficiency denitrification of municipal wastewater. To further explore the denitrification mechanism of this process, analysis and optimization of the denitrification pathway, determination of the main nitrogen-removing functional bacteria activity and analysis of the microbial community structure were carried out in a pilot-scale reactor that has been operated for 2 years. Intermittent aeration promoted the coupling of short-cut nitrification and Anammox processes, and the nitrogen removal efficiency was the highest when the aeration rate was 20 mL/min [DO of (0.18±0.03) mg/L]. Anaerobic ammonia oxidizing bacteria (AnAOB) were distributed in the biofilm with an activity of 44.60 mg/(gVSS·d), and the detected AnAOB was Candidatus Brocadia with relative abundance of 0.28%. Ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) were mainly distributed in the suspended sludge, and their activities were 61.53 mg/(gVSS·d) and 86.95 mg/(gVSS·d), respectively. The detected genera of AOB and NOB were mainly Nitrosomonas (0.10%) and Nitrospira (2.10%) respectively.
Last Update:
2023-05-01