SANGWen-jiao,WANGChen,JIADan-ni,et al.Sludge Reduction in A/A/O System with Internal Reflux Nitrification Liquid Treated by Electromagnetic Wave[J].China Water & Wastewater,2024,40(1):68-75.
Sludge Reduction in A/A/O System with Internal Reflux Nitrification Liquid Treated by Electromagnetic Wave
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第1期
Page:
68-75
Column:
Date of publication:
2024-01-01
- Keywords:
- sludge reduction; electromagnetic wave treatment; internal reflux nitrification liquid; apparent sludge yield; cell lysis rate; abundance of bacteria
- Abstract:
- Electromagnetic wave was employed for the treatment of internal reflux nitrification liquid in A/A/O system to obtain better sludge reduction performance. After establishing the relationship between the cell lysis rate and the characteristics of the internal reflux nitrification liquid, electromagnetic wave was applied to treat the internal reflux nitrification liquid of an A/A/O system, and the improved performance of sludge reduction and the distribution characteristics of functional bacteria in the system were analyzed. The internal reflux nitrification liquid treated by electromagnetic wave significantly improved the sludge reduction performance of the system. The total relative abundance of functional bacteria such as chronic growing bacteria, hydrolytic bacteria, fermenting bacteria and predatory bacteria increased. Under the following operating conditions: power of electromagnetic wave was 100 W, treatment time was 75 s, and proportion of the treated internal reflux nitrification liquid was 10%, the apparent sludge yield decreased by 15.68%, and the total relative abundance of functional bacteria in anaerobic, anoxic and aerobic tanks increased by 19.51%, 20.59% and 31.55%, respectively. Under the same operating conditions except the power of electromagnetic wave was increased to 400 W, the apparent sludge yield decreased by 43.14%, and the total relative abundance of functional bacteria in anaerobic, anoxic and aerobic tanks increased by 18.34%, 26.30% and 33.91%, respectively.
Last Update:
2024-01-01