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一种自养脱氮工艺:短程硝化与 ANAMMOX 联合处理 UASB 反应器处理垃圾渗滤液稀释出水

An autotrophic nitrogen removal process: short-cut nitrification combined with ANAMMOX for treating diluted effluent from an UASB reactor fed by landfill leachate.

机构信息

Environmental Simulation and Pollution Control State Key Joint Laboratory, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.

出版信息

J Environ Sci (China). 2010;22(5):777-83. doi: 10.1016/s1001-0742(09)60176-5.

Abstract

A combined process consisting of a short-cut nitrification (SN) reactor and an anaerobic ammonium oxidation upflow anaerobic sludge bed (ANAMMOX) reactor was developed to treat the diluted effluent from an upflow anaerobic sludge bed (UASB) reactor treating high ammonium municipal landfill leachate. The SN process was performed in an aerated upflow sludge bed (AUSB) reactor (working volume 3.05 L), treating about 50% of the diluted raw wastewater. The ammonium removal efficiency and the ratio of NO2- -N to NOx- -N in the effluent were both higher than 80%, at a maximum nitrogen loading rate of 1.47 kg/(m3 x ay). The ANAMMOX process was performed in an UASB reactor (working volume 8.5 L), using the mix of SN reactor effluent and diluted raw wastewater at a ratio of 1:1. The ammonium and nitrite removal efficiency reached over 93% and 95%, respectively, after 70-day continuous operation, at a maximum total nitrogen loading rate of 0.91 kg/(m3 x day), suggesting a successful operation of the combined process. The average nitrogen loading rate of the combined system was 0.56 kg/(m3 x day), with an average total inorganic nitrogen removal efficiency 87%. The nitrogen in the effluent was mostly nitrate. The results provided important evidence for the possibility of applying SN-ANAMMOX after UASB reactor to treat municipal landfill leachate.

摘要

采用短程硝化(SN)-厌氧氨氧化(ANAMMOX)组合工艺处理上流式厌氧污泥床(UASB)反应器处理高氨氮城市垃圾渗滤液的稀释出水。SN 过程在曝气上流式污泥床(AUSB)反应器(工作体积 3.05 L)中进行,处理约 50%的稀释原水。在最大氮负荷率为 1.47 kg/(m3 x ay)时,氨氮去除率和出水 NO2--N 与 NOx--N 的比值均高于 80%。ANAMMOX 过程在 UASB 反应器(工作体积 8.5 L)中进行,采用 SN 反应器出水和稀释原水以 1:1 的比例混合。在连续运行 70 天后,氨氮和亚硝态氮的去除率分别达到 93%和 95%以上,最大总氮负荷率为 0.91 kg/(m3 x day),表明组合工艺运行成功。组合系统的平均氮负荷率为 0.56 kg/(m3 x day),总无机氮去除率平均为 87%。出水中的氮主要以硝酸盐形式存在。结果为 UASB 反应器后采用 SN-ANAMMOX 处理城市垃圾渗滤液提供了重要依据。

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