ASBR厌氧氨氧化反应器的快速启动及脱氮原理分析

以城市生活污水为基本水质进行配水,采用ASBR研究了厌氧氨氧化反应器的快速启动过程及脱氮性能。实验条件如下:T为(35±1)℃、HRT为24 h、pH为7.2～7.5,进水NH4+-N、NO2--N浓度为40～160 mg/L,TN负荷为0.08～0.34 kg TN/(m3.d),按2∶1比例混合接种好氧短程硝化污泥和厌氧氨氧化污泥,经49 d运行成功启动厌氧氨氧化反应器,并实现稳定运行。实验结果表明:稳定运行期NH4+-N、NO2--N去除率分别达96%和98%;NH4+-N、NO2--N去除量与NO3--N生成量比值为1∶1.05∶0.29,较为接近理论值;成功启动的反应器出水pH高于进水;系统TN去除率平均值为79.7%;反应器内存在反硝化与厌氧氨氧化的协同作用,实现了部分COD去除;污泥由深棕色絮状变成红褐色颗粒状,经SEM扫描电镜观察污泥菌群种类单一,多为球状菌,有漏斗状缺口,具有典型氨氧化菌形态特征。

Fast start-up and denitrified principle analysis of ANAMMOX in ASBR

With the influent water distribution based on the municipal sewage,the fast start-up and denitrification performance of ANAMMOX reaction in ASBR was studied.The experimental conditions were as follows: the temperature of(35±1)℃,HRT of 24 hours,influent pH of 7.2~7.5,influent NH+4-N and NO-2-N concentrations of both 40~160 mg/L,TN volumetric load of 0.08~0.34 kg TN/(m3·d).Inoculating the mixture of aerobic short-cut nitrification sludge and anaerobic ammonium oxidation sludge with the proportion of 2∶ 1,the ANAMMOX reaction was successfully started-up in 49 days and realized a stable operation.The experimental results show that at the stable state the average NH+4-N、NO-2-N removal rates were 96% and 98%,respectively;the ratio of NH+4-N、NO-2-N removal and NO-3-N formation was 1∶ 1.05∶ 0.29,which was very close to the theoretical value.After been started-up,the reactor’s effluent pH value was higher than influent,the average TN removal rate was 79.7%.The synergistic effect of denitrifying and ANAMMOX realized part of COD removal;the sludge changed from flocculent dark-brown to granular red-brown,the dominant flora bacteria was mostly spherical with a funnel-shaped gap,it had the typical characteristic of ammonia-oxidizing bacteria.