HONGMeng,LINChi-hao,WANGJian-wei,et al.Effects of Temperature on Nitrogen Removal Performance and Sludge Characteristics of Anammox-HAP[J].China Water & Wastewater,2023,39(7):1-7.
Effects of Temperature on Nitrogen Removal Performance and Sludge Characteristics of Anammox-HAP
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第7期
Page:
1-7
Column:
Date of publication:
2023-04-01
- Keywords:
- Anammox; hydroxyapatite (HAP); municipal wastewater; nitrogen removal; granular sludge characteristics; temperature
- Abstract:
- Anaerobic ammonia oxidation (Anammox) technology has the limitations such as difficulty in biomass retention, and low activity of Anammox bacteria (AnAOB) caused by temperature fluctuations in mainstream municipal wastewater treatment. It is feasible to adopt Anammox-hydroxyapatite (Anammox-HAP) granular sludge with high biomass concentration and stronger environmental resistance to achieve nitrogen removal in mainstream wastewater. An Anammox-HAP reactor had operated for 176 days to treat mainstream wastewater to investigate the nitrogen removal performance and Anammox-HAP granular sludge characteristics at different temperatures. First, mainstream wastewater from municipal wastewater treatment plant by reducing total nitrogen (TN) concentration was simulated, and the nitrogen loading rate (NLR) was kept at 3.2 g/(L·d). At 18-35 ℃, the concentration of TN in the effluent was stable lower than 15 mg/L and maintained excellent nitrogen removal performance at high nitrogen load conditions; At 13-18 ℃, the removal rate of TN was significantly reduced, and the minimum was reduced to 46.4% at 13 ℃. After the temperature increased, the removal rate of TN recovered to a maximum of 77.8% at 30 ℃, indicating that the decrease in the activity of AnAOB caused by low temperature was reversible. The removal rate of phosphorus in the reactor during decreasing the temperature was 20.2%, and the HAP characteristics were stable at low temperature. However, the VSS/TSS of Anammox-HAP granular sludge decreased with a drop of temperature.
Last Update:
2023-04-01