YANShi-kun,DAIYong-hua,WANGLi-hua,et al.Determination of Maximum Specific Growth Rate Constant of Nitrifying Bacteria in Municipal Wastewater Treatment Plants[J].China Water & Wastewater,2025,41(19):88-94.
市政污水处理厂硝化菌最大比增长速率常数的测定
- Title:
- Determination of Maximum Specific Growth Rate Constant of Nitrifying Bacteria in Municipal Wastewater Treatment Plants
- Keywords:
- wastewater treatment plant; nitrifying bacteria; maximum specific growth rate constant; municipal wastewater
- 摘要:
- 硝化菌最大比增长速率常数（μAUT）是污水处理厂设计与运行的重要参数。优化μAUT的测定条件并测定不同工艺的μAUT典型范围，对于提升污水处理系统效能具有重要意义。结果表明，μAUT测定的最佳污泥浓度为100~200 mg/L，最佳初始氨氮浓度为50 mg/L，重现性分析显示构建的直接测定法具有良好的准确性与可靠性（R2 > 0.980，相对标准偏差为2.57%）。25 ℃下对上海市6座市政污水处理厂的测定结果显示，厌氧-缺氧-好氧（AAO）工艺、倒置AAO工艺和移动床生物膜反应器（MBBR）工艺的μAUT值分别为（1.28 ± 0.10）、（1.40 ± 0.04）和（2.12 ± 0.21） d-1，MBBR工艺的泥膜混合系统可显著提升μAUT值。生活污水悬浮生长活性污泥系统的μAUT典型范围为1.27~1.34 d-1，但排水体制、管网输送距离及工业废水混入等因素会影响μAUT水平。建议在污水处理厂的设计与运行中采用实测值，以合理控制工程投资与后续运行成本。
- Abstract:
- The maximum specific growth rate constant of nitrifying bacteria (μAUT) is a crucial parameter for the design and operation of wastewater treatment plants（WWTPs）. Optimizing the measurement conditions of μAUT and determining its typical range for different treatment processes are of significant importance for improving the efficiency of wastewater treatment systems. The results showed that the optimal sludge concentration for measuring μAUT was 100-200 mg/L, and the optimal initial ammonia nitrogen concentration was 50 mg/L. Reproducibility analysis indicated that the constructed direct measurement method demonstrated good accuracy and reliability, with R2>0.980 and relative standard deviation of 2.57%. Measurement results for six municipal WWTPs in Shanghai at 25 ℃ showed that the μAUT values for the anaerobic-anoxic-oxic (AAO) process, inverted AAO process, and moving bed biofilm reactor (MBBR) process were (1.28 ± 0.10) d-1, (1.40 ± 0.04) d-1, and (2.12 ± 0.21) d-1 respectively. The sludge-biofilm mixed system in the MBBR process significantly enhanced the μAUT value. The typical μAUT range for the activated sludge system treating domestic wastewater was 1.27-1.34 d-1, although factors such as drainage system type, pipeline length, and industrial wastewater influx may affect μAUT levels. It is recommended that measured values be used in the design and operation of WWTPs to optimize investments and subsequent operational costs.
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