Performance, kinetics characteristics and enhancement mechanisms in anammox process under Fe(II) enhanced conditions
Performance, kinetics characteristics and enhancement mechanisms in anammox process under Fe(II) enhanced conditions
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Fe(II)增强条件下厌氧氨氧化过程的性能、动力学特征和增强机制
DOI：
10.1007/s10532-020-09905-y
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发表时间：
2020-06
期刊：
影响因子：
3.6
通讯作者：
Zhang Xiao-ling
中科院分区：
文献类型：
--
作者：
Tang Si-min;Xu Ze-hao;Liu Ya-lei;Yang Guang-feng;Mu Jun;Jin Ren-cun;Yang Qiao;Zhang Xiao-ling
为探讨亚铁强化条件下厌氧氨氧化工艺的运行性能、动力学特征及强化机理，建立了实验室规模的UASB厌氧氨氧化反应器，并进行了534 d的运行。试验结果表明，厌氧氨氧化工艺在短时间内成功启动，在进水Fe（II）浓度为5.3 mg L-1的条件下，经过长期运行，总氮去除率达到83.34 ± 2.96%，最大总氮去除率为14.4 kg m-3d-1。采用不同动力学模型的模拟结果表明，Stover-Kincannon模型和Grau二级动力学模型能够较好地描述Fe（II）强化条件下厌氧氨氧化反应的动力学特性.胞外聚合物（EPS）是厌氧氨氧化污泥颗粒化和提高厌氧氨氧化活性的关键。铁通过降低PN/PS比值提高了污泥的疏水性，同时也增加了厌氧氨氧化颗粒的粒径。粒径大于2.00的污泥占污泥总量的58.3%。同时，铁的存在降低了EPS的含量，也降低了污泥对铁的吸附能力。铁离子的迁移量增加，提高了厌氧氨氧化反应器的脱氮能力。
In order to explore the performance, kinetics characteristics and enhancement mechanisms in anammox process under ferrous iron enhanced conditions, a laboratory-scale UASB anammox reactor has been built up and operated for 534 days. Experimental results showed that the Anammox process was successfully started up in a short operation period and the TNRE reached 83.34 ± 2.96% with a maximum total nitrogen removal rate of 14.4 kg m-3d-1after long-term operated under influent Fe(II) concentration of 5.3 mg L-1. Simulation results using different kinetic models showed that the Stover-Kincannon model and the Grau second-order model were useful for describing the anammox performance under Fe(II) enhanced conditions. Extracellular polymeric substance (EPS) act a pivotal part in the granulation of Anammox sludge and the improvement of anammox activity. Iron improved the hydrophobicity of the sludge by reducing the PN/PS ratios, and also increased the Anammox granular diameter. The granular diameter of higher than 2.00 accounted for 58.3% of the total sludge. At the same time, the presence of iron decreased EPS levels, and also decreased the iron adsorption ability to sludge. More iron was transported into Anammox, which improved the nitrogen removal ability in the Anammox reactor.
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