LIYun-hui,HANXin-hong,ZHOUZhen.Impact of High and Low Hydraulic Loads Switching on Nitrogen Removal Efficiency in AAO Process[J].China Water & Wastewater,2025,41(15):103-108.
高低水力负荷切换对AAO工艺脱氮性能的影响
- Title:
- Impact of High and Low Hydraulic Loads Switching on Nitrogen Removal Efficiency in AAO Process
- Keywords:
- hydraulic load; AAO process; nitrogen removal; microbial activity
- 摘要:
- 污水处理厂高低水力负荷切换是实现提质增效和污染物零溢流的重要途径之一。为此，依托规模为30×104 m3/d的污水处理厂，研究了高低水力负荷切换对典型AAO工艺脱氮性能的影响。结果表明，高、低水力负荷阶段TN去除率均维持在77%以上，NH4+-N去除率均在99%以上，但低水力负荷阶段出水TN和NH4+-N浓度更低。由高水力负荷切换为低水力负荷，硝化和反硝化反应更为充分，主要是由于水力停留时间的延长。低水力负荷运行时，硝化活性略有降低，而反硝化活性明显提高。硝化菌丰度稳定在3.56%~3.95%，其中优势硝化菌Ellin6067和Bryobacter的丰度呈现上升趋势；反硝化菌的丰度由高水力负荷运行阶段的12.64%提升至低水力负荷运行阶段的16.79%，主要是促进了优势反硝化菌Terrimonas和SWB02的富集。
- Abstract:
- Switching between high and low hydraulic loads in sewage treatment plants represents one of the critical strategies for achieving quality and efficiency enhancement, and the prevention of pollutants overflow. This study investigated the impact of hydraulic loads switching on nitrogen removal performance within the conventional AAO process of a sewage treatment plant with a capacity of 30×104 m3/d. the removal efficiencies of TN and NH4+-N remained above 77% and 99%, respectively, under both high and low hydraulic loads; however, the effluent TN and NH4+-N concentrations were lower under the low hydraulic load. With the change of high to low hydraulic load, the nitrification and denitrification reactions were both enhanced, which was ascribed to the prolonged hydraulic retention time. Under the low hydraulic load, while nitrifying activity underwent a little decrease, the activity of denitrifying bacteria increased obviously. The abundance of nitrifying bacteria remained stable at 3.56%-3.95%, with the dominant species Ellin6067 and Bryobacter exhibiting an upward trend in their abundances. The abundance of denitrifying bacteria increased from 12.64% under the high hydraulic load to 16.79% under the low hydraulic load, and the enrichment of dominant denitrifying bacteria Terrimonas and SWB02 were the primary contributors.
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