生物接触氧化装置优化参数的除污效率和硝化菌群变化分析

Decontamination Efficiency and Nitrifying Bacteria Change Analysis in the Parameter Optimization of Biological Contact Oxidation Unit

采用模拟农村生活污水进行研究,通过改变反应器的工艺参数,包括水力停留时间（HRT）、气水比和碳氮比（C/N）等,考察各因素对反应器去除污染物（COD、NH＋4-N及TN）及硝化菌群的影响,寻求最优化的工艺参数。结果表明,HRT的延长有助于系统内硝化菌群生长,当HRT为6h时,NH＋4-N、TN去除率可维持较高水平。气水比对于有机物的去除效果影响不大,但对氨氮和总氮的去除具有显著的影响,气水比也对硝化菌群的群落特征产生影响,硝化菌丰度随着气水比的增加而降低。综合考虑去除效果和经济性原则,最佳气水比为5。碳氮比（C/N）在8-10范围内有利于反硝化作用和TN的去除,但会导致硝化菌的丰度水平下降。

With simulating rural domestic sewage,by changing the technological parameters including HRT,gas-water ratio and C/N the effects of these factors on the decontamination efficiency（COD,NH＋ 4-N and TN）and nitrification microorganism were investigated.The results indicated that the extension of HRT enhanced the growth of nitrifying bacteria.NH＋ 4-N,TN removal efficiency could maintain a higher level as the HRT was 6h.Gas-water ratio significantly impacted removal of NH＋ 4-N and TN,however,had little effect on COD.Gas-water ratio also had influence on the community characteristics of nitrifying bacteria,which the denitrifying bacteria abundance decreased with increasing gas-water ratio.The optimum gas-water ratio was 5 considering the removal rate and economy principle.C/N within 8~10 was beneficial to denitrification and TN removal,but caused a decline of nitrifying bacteria abundance levels.