进水氨氮浓度对好氧颗粒污泥的影响研究

在颗粒化SBR反应器中，研究了进水氨氮浓度对好氧颗粒污泥的影响.结果表明，进水氨氮浓度的提高将刺激丝状菌的生长；当氨氮负荷达到0.80 kg/(m³·d)时，颗粒开始明显解体，大量污泥流失；但氨氮负荷过低［0.0 kg/(m³·d)］，好氧颗粒污泥同样不能正常的形成.同时，氨氮负荷的提高，会出现颗粒污泥结构松散，粒径增大，沉降速度减小，颗粒化率下降以及生物量降低等现象.反应器对有机污染物和TP的平均去除效率分别为90%和70%，进水氨氮浓度的提高对其影响不大；但高氨氮负荷能抑制硝化菌和反硝化菌的活性，当进水氨氮负荷由0.48 kg/(m³·d)提高到0.80 kg/(m³·d)时，反应器对氨氮和总氮的去除率分别由90%和80%下降到70%和50%.

Effect of Ammonia Concentration on the Characteristic of Aerobic Granular Sludge

The effect of ammonia concentration in influent on the characteristic of granular sludge was investigated in the granular SBR. Results indicated that the increase of ammonia concentration could induce filamentous growth. When the loading rate of ammonia was as high as 0.80 kg /(m³·d), obvious disintegration of granules and washout of sludge were observed. However, in absent of ammonia, aerobic granules could not form either. Moreover, it was found that the increase of ammonia concentration could result in disperse structure, diameter increase, settleability and MLSS reduce of aerobic granular sludge system. The average removals of COD and TP by granular SBR could keep 90% and 70% respectively, and were not influenced by the increase of ammonia. But the activities of nitrification bacteria and denitrification bacteria were restricted seriously by the ammonia concentration increase. When loading rate of ammonia was increased from 0.48 kg/(m³·d) to 0.80 kg/(m³·d), the average removal rates of NH⁺₄-N and TN reduced to 70% and 50%.