Fe2+/Fe3+和Mn2+对低氧曝气过程总氮去除与转化途径的影响  

Influences of Fe2+/Fe3+ and Mn2+ on total nitrogen removal and nitrogen transformations during low-oxygen aeration

作　　者：李健敏 杨庆[1] 刘智斌 刘润雨 崔斌[1] LI Jianmin;YANG Qing;LIU Zhibin;LIU Runyu;CUI Bin(College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学环境与能源工程学院

出　　处：《化工学报》2019年第9期3503-3510,共8页CIESC Journal

基　　金：国家自然科学基金项目(51878011);北京市自然科学基金项目(8182012)

摘　　要：为短期快速实现实际生活污水自养脱氮,采用含有厌氧氨氧化菌的实际污水处理厂活性污泥,针对Fe^2+/Fe^3+和Mn^2+对低氧曝气过程中氮的去除效果进行了研究,分析确定了氮素转化的途径。研究结果表明,Fe^2+/Fe^3+和Mn^2+均可提高活性污泥中厌氧氨氧化菌(AnAOB)丰度,但由于Fe^2+/Fe^3+对氨氧化菌(AOB)也存在一定抑制作用,因此,短期投加Fe^2+/Fe^3+条件下,低氧曝气过程中总无机氮去除率为25%,但投加Mn^2+条件下总无机氮去除率可达44%。通过氮素平衡分析,发现投加Fe^2+/Fe^3+条件下,氮素主要通过反硝化作用去除;而投加Mn^2+条件下,氮素主要通过厌氧氨氧化(anammox)作用去除。因此,传统活性污泥可通过短期投加Mn^2+增强厌氧氨氧化活性,促进低氧曝气过程中氮的去除,利于快速实现一体化自养脱氮。To quickly realize the autotrophic denitrification of actual domestic sewage in the short term,the activated sludge from the actual sewage treatment plant containing anammox bacteria was used to study the removal effect of nitrogen in the process of hypoxia aeration for Fe^2+/Fe^3+and Mn^2+.The results showed that both Fe^2+/Fe^3+and Mn^2+can increase the abundance of anammox bacteria(AnAOB)in activated sludge,but Fe^2+/Fe^3+had a certain inhibitory effect on ammonia oxidizing bacteria(AOB);therefore,the total inorganic nitrogen removal rate was 25%in the presence of Fe^2+/Fe^3+under short-term dosing,but the total inorganic nitrogen removal rate was 44%in the presence of Mn^2+.Nitrogen balance analysis showed that nitrogen transformation was mainly denitrification under the condition of Fe^2+/Fe^3+;but was mainly anaerobic ammonium oxidation(anammox)process under the condition of Mn^2+.Therefore,the anammox activity could be enhanced in traditional activated sludge by short-term addition of Mn^2+,promoting the removal of nitrogen during the low-oxygen aeration,and facilitating the rapid achievement of integrated autotrophic nitrogen removal.

关 键 词：Fe^2+/Fe^3+ MN^2+ 传统活性污泥 氮去除 氮素转化 

分 类 号：TQ028.8[化学工程]