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.
温度对Anammox-HAP脱氮性能及污泥特性的影响
- Title:
- Effects of Temperature on Nitrogen Removal Performance and Sludge Characteristics of Anammox-HAP
- Keywords:
- Anammox; hydroxyapatite (HAP); municipal wastewater; nitrogen removal; granular sludge characteristics; temperature
- 摘要:
- 厌氧氨氧化（Anammox）用于城市污水处理存在生物质持留难、温度波动引起厌氧氨氧化菌（AnAOB）活性降低等问题，采用具有高生物质浓度及更强环境抵抗能力的厌氧氨氧化-羟基磷灰石（Anammox-HAP）颗粒污泥脱氮具有可行性。Anammox-HAP反应器运行了176 d，用于考察不同温度对城污水脱氮性能及污泥特性的影响。首先通过降低总氮（TN）浓度模拟城市污水厂的主流污水并保持氮负荷率（NLR）为3.2 g/（L·d）。在18~35 ℃下出水TN稳定低于15 mg/L，在主流高负荷条件下保持优异的脱氮性能；在13~18 ℃，TN去除率明显降低，在13 ℃降至46.4%。温度提升后，TN去除率在30 ℃下最高恢复至77.8%，表明低温导致的AnAOB活性下降可逆。在降温的过程中磷去除率为20.2%，低温条件下HAP性质稳定，但Anammox-HAP颗粒污泥的VSS/TSS随着温度的下降而降低。
- 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.
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