ASBR厌氧氨氧化反应器的快速启动及脱氮原理分析
Fast start-up and denitrified principle analysis of ANAMMOX in ASBR
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摘要: 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NH+4-N、N-2-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NH+4-N、N-2-N去除率分别达96%和98%；NH+4-N、N-2-N去除量与N-3-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。Abstract: 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 N-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、N-2-N removal rates were 96% and 98%， respectively； the ratio of NH+4-N、N-2-N removal and N-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.
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Key words:
- ASBR /
- anaerobic ammonium oxidation /
- start-up /
- denitrification principle /
- granular sludge
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