【摘要】：采用呼吸試驗(yàn)測(cè)比耗氧速率和硝化速率,研究了季銨化合物對(duì)生物硝化過程的抑制效應(yīng)。呼吸試驗(yàn)結(jié)果表明,季銨化合物的存在明顯降低了硝化細(xì)菌的呼吸速率,在污泥濃度(MLVSS)為534 mg/L的情況下,季銨化合物濃度為2 mg/L就已明顯降低了硝化細(xì)菌的呼吸速率,抑制率為19.88%。隨著季銨化合物濃度的增加,抑制作用更加明顯,濃度為5、10、20、35和50mg/L時(shí),對(duì)應(yīng)的抑制率分別為39.53%、47.76%、51.65%、77.29%和85.65%,當(dāng)濃度增加到80mg/L時(shí),硝化呼吸作用幾乎停止。硝化速率試驗(yàn)結(jié)果表明,季銨化合物降低了氨氮氧化速率,抑制了氨氧化菌和亞硝酸鹽氧化菌的活性,亞硝酸鹽的累積隨著季銨化合物濃度的增加而減少。在MLVSS為1 300 mg/L的情況下,加入濃度為10、20、30、50、60、70和90 mg/L的季銨化合物,對(duì)應(yīng)的硝化速率抑制率分別為11.07%、37.52%、64.64%、81.88%、89.74%、92.55%和95.55%。當(dāng)季銨化合物濃度30 mg/L時(shí),亞硝酸鹽累積現(xiàn)象比較明顯;濃度為50 mg/L時(shí),季銨化合物已嚴(yán)重抑制了氨氧化細(xì)菌;當(dāng)濃度60 mg/L時(shí),沒有亞硝酸鹽累積。硝化呼吸抑制試驗(yàn)中半抑制濃度為12 mg/L,硝化速率抑制試驗(yàn)中半抑制濃度為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..
【作者單位】： 南開大學(xué)環(huán)境科學(xué)與工程學(xué)院;
【基金】：天津市自然科學(xué)基金資助項(xiàng)目(17JCYBJC23300) 國家水體污染控制與治理科技重大專項(xiàng)(2016YFC0400704)
【分類號(hào)】：X703

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