附积床生物膜反应器同步硝化反硝化脱氮特性

Simultaneous Nitrification and Denitrification by Catching Bed Biofilm Reactor

基于传统的生物膜技术开发了新型的附积床生物膜反应器并考察其脱氮效果.结果表明,在不同HRT下可以获得稳定的COD去除效果,平均去除率达81.7%;在水力停留时间为3.90 h,NH+4-N、TN的平均负荷分别为0.47 kg/(m3.d)、0.59kg/(m3.d)时,可以获得NH+4-N 92.7%和TN 67.5%的去除效果.实验中混合液的溶解氧浓度(DO)是影响TN去除效果的最重要因素,pH是影响NH4+-N、TN去除效果的重要因素之一,最佳脱氮效果的控制条件为DO在0.1～2.0 mg/L之间,pH值在7.0～7.5之间,分析了实验中同步硝化反硝化脱氮的机制.

Catching bed biofilm reactor combined with traditional biofilm process as a novel treatment was developed.The performance of the reactor for nitrogen removal was investigated.Steady removal effect with 81.7% of average COD removal rate was achieved in various hydraulic retention time（HRT）.Even when hydraulic retention time（HRT） was only at 3.90 h with average NH4^＋-N volumetric loading of 0.47 kg/（m^3·d） and TN of 0.59 kg/（m^3·d）,92.7% of average NH4^＋-N removal rate and 67.5% of average TN removal rate were achieved.In the experiment dissolved oxygen（DO）was the most crucial factor for removal rates of TN and pH was a crucial factor for removal rates of NH4^＋-N、TN.The optimal condition was with DO 0.1-2.0 mg/L and pH of 7.0-7.5.Mechanisms of TN removal via simultaneous nitrification and denitrification in the experiment were analyzed.