季铵化合物对生物硝化的抑制效应研究

发布时间：2019-02-24 16:28

【摘要】：采用呼吸试验测比耗氧速率和硝化速率,研究了季铵化合物对生物硝化过程的抑制效应。呼吸试验结果表明,季铵化合物的存在明显降低了硝化细菌的呼吸速率,在污泥浓度(MLVSS)为534 mg/L的情况下,季铵化合物浓度为2 mg/L就已明显降低了硝化细菌的呼吸速率,抑制率为19.88%。随着季铵化合物浓度的增加,抑制作用更加明显,浓度为5、10、20、35和50mg/L时,对应的抑制率分别为39.53%、47.76%、51.65%、77.29%和85.65%,当浓度增加到80mg/L时,硝化呼吸作用几乎停止。硝化速率试验结果表明,季铵化合物降低了氨氮氧化速率,抑制了氨氧化菌和亚硝酸盐氧化菌的活性,亚硝酸盐的累积随着季铵化合物浓度的增加而减少。在MLVSS为1 300 mg/L的情况下,加入浓度为10、20、30、50、60、70和90 mg/L的季铵化合物,对应的硝化速率抑制率分别为11.07%、37.52%、64.64%、81.88%、89.74%、92.55%和95.55%。当季铵化合物浓度30 mg/L时,亚硝酸盐累积现象比较明显;浓度为50 mg/L时,季铵化合物已严重抑制了氨氧化细菌;当浓度60 mg/L时,没有亚硝酸盐累积。硝化呼吸抑制试验中半抑制浓度为12 mg/L,硝化速率抑制试验中半抑制浓度为25 mg/L。
[Abstract]:The inhibition effect of quaternary ammonium compounds on the biological nitrification process was studied by means of the specific oxygen consumption rate and nitrification rate measured by respiratory test. The results of respiration test showed that the presence of quaternary ammonium compounds significantly reduced the respiration rate of nitrifying bacteria, and the sludge concentration (MLVSS) was 534 mg/L. The respiratory rate of nitrifying bacteria was obviously decreased by the concentration of Quaternary ammonium compound for 2 mg/L, and the inhibition rate was 19.88%. With the increase of the concentration of quaternary ammonium compounds, the inhibitory effect was more obvious. When the concentration of quaternary ammonium compounds was 50.100.20% and 50mg/L, the corresponding inhibition rates were 39.53 and 47.76and 57.65%, respectively, and 85.65%, respectively. When the concentration was increased to 80mg/L, the inhibition rate was 77.29% and 85.65%, respectively. Nitrification and respiration were almost stopped. The nitrification rate test showed that quaternary ammonium compounds decreased the ammonia nitrogen oxidation rate and inhibited the activity of ammonia-oxidizing bacteria and nitrite oxidizing bacteria. The accumulation of nitrite decreased with the increase of the concentration of quaternary ammonium compounds. Under the condition of MLVSS being 1 300 mg/L, adding quaternary ammonium compounds with concentration of 10? 20? 30? 50? and 90? mg/L, the corresponding nitrification rate inhibition rates were 11.07? 92.55% and 95.55%. When the concentration of quaternary ammonium compounds was 30 mg/L, the nitrite accumulation was obvious, and when the concentration was 50 mg/L, the quaternary ammonium compounds had seriously inhibited the ammonia-oxidizing bacteria, and there was no nitrite accumulation at the concentration of 60 mg/L. The half inhibitory concentration in nitrification respiratory inhibition test was 12 mg/L, nitrification rate inhibition test and the half inhibitory concentration in nitrification respiratory inhibition test was 25 mg/L..
【作者单位】：南开大学环境科学与工程学院;
【基金】：天津市自然科学基金资助项目(17JCYBJC23300) 国家水体污染控制与治理科技重大专项(2016YFC0400704)
【分类号】：X703

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