异养硝化菌提高好氧颗粒污泥脱氮效率的试验研究

Experimenfal Study for Improving the Denitrification Efficiency of Aerobic Granular Sludge by Heterotrophic Nitrobacterium

通过人工配置污水,研究兼性细菌较多的活性污泥.首先在进水NH4—N浓度为200mg/L,COD浓度为1 000mg/L,溶解氧10.0mg/L条件下筛选培养出好氧异养菌占优的脱氮性能较强的活性污泥.然后通过控制SBR反应器曝气量(溶解氧先后为2mg/L、6mg/L、2mg/L),创造利于某些好氧异养硝化菌生长的环境,从而确定异养硝化菌的优势地位.其间不断降低泥沉降时间至5min,培养出了以异养硝化菌为主的好氧颗粒污泥.最终COD、NH4—N、TN、TP去除率分别为95%、98%、80%、98%.

The active sludge is studied with more facultative bacteria by artificial sewage.At first,the activated sludge with high nitrogen removal performance is cultivated,where the aerobic heterotrophic bacteria is dominant.The wltivating conditions are：COD loading rate is 1 000 mg/L,NH4—N loading rate is 200 mg/L and dissolved oxygen is 10 mg/L.Then,by controlling the aeration rate of SBR reactors（dissolved oxygen is 2 mg/L、6 mg/L、2 mg/L）,we create the environment which is beneficial for aerobic heterotrophic nitro-bacteria,and then confirm their advantageous position.During this period,the sludge settling time is reduced to 5 min,so as to cultivate the aerobic granular sludge,whose main ingredient is heterotrophic nitrification.Finally,the removal efficiencies of COD,NH4—N,TN,TP is 95%,98%,80%,98%,respectively.