有机物浓度对厌氧氨氧化脱氮性能影响试验研究
Effect of organic substrate on nitrogen removal of ANAMMOX
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摘要: 通过间歇试验和连续试验研究了不同有机物浓度对厌氧氨氧化活性及脱氮性能的影响。间歇试验结果表明：自养条件下厌氧氨氧化菌的最大比反应速率为0.189 kg NH+4-N/（kg VSS·d）；当氨氮和亚硝酸盐氮浓度为80 mg/L时，有机物的添加降低了厌氧氨氧化速率，当有机物浓度超过70 mg/L时，厌氧氨氧化菌的最大比反应速率降低到0.05 kg NH+4-N/（kg VSS·d）以下，是反硝化菌与厌氧氨氧化菌竞争亚硝酸盐产生了可逆抑制的结果。连续试验结果表明，高氮低碳源有机环境下厌氧氨氧化能稳定运行，并且比自养系统中总氮的去除率有所提高，当COD值为50 mg/L时，总氮去除率最大，平均值达96.59%，是反硝化菌和厌氧氨氧化菌共同脱氮的结果；当有机物浓度过高时，ANAMMOX对TN去除贡献率持续降低，反硝化不断得到强化，厌氧氨氧化运行不稳定。Abstract: Effect of different organic substrate concentration on nitrogen removal of ANAMMOX process was researched through batch and continuous experiments. The maximum ammonium oxidizing rate reached 0.189 kg NH+4-N/(kg VSS·d）under autotrophic conditions. When both NH+4-N and NO-2-N concentration of influent were about 80 mg/L, ANAMMOX activity was inhibited by organic substrate, which was the result of competition between denitrifying bacteria and ANAMMOX bacteria. The ammonium oxidizing rate fell below to 0.05 kg NH+4-N/（kg VSS·d） when the concentration of organic substrate was more than 70 mg/L. It was indicated that high ratio of N/C system was more liable for TN removal than a completely autotrophic system through continuous experiments, due to the coactions of denitrifying bacteria and ANAMMOX bacteria. The average TN removal efficiency reached 96.59% when the COD was 50 mg/L. When the concentration of organic substrate was high enough, denitrification became more and more dominant and ANAMMOX weakened.
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Key words:
- ANAMMOX /
- ammonium nitrogen /
- TN removal efficiency /
- ANAMMOX activity /
- organic substrate
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