Laboratory study of nitrification, denitrification and anammox processes in membrane bioreactors considering periodic aeration
Laboratory study of nitrification, denitrification and anammox processes in membrane bioreactors considering periodic aeration
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DOI：
10.1016/j.jenvman.2014.03.013
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发表时间：
2014-09-01
影响因子：
8.7
通讯作者：
Jaffe, Peter R.
中科院分区：
文献类型：
--
作者：
Abbassi, Rouzbeh;Yadav, Asheesh Kumar;Jaffe, Peter R.
研究了膜生物反应器（MBR）在周期曝气条件下进行同步硝化-厌氧氨氧化-反硝化（SNAD）的可行性。采用两个反应器分别考察了不同厌氧氨氧化生物量对硝化生物量和反硝化生物量对脱氮效果的影响。结果表明，厌氧氨氧化生物量较高的反应器对氧循环的耐受性较强。通过在四小时的循环中施加一小时的曝气，观察到约98%的总氮（TN）和83%的总有机碳（TOC）去除效率。减少曝气时间为30，15，和2分钟，在4小时的周期影响最终的TN去除效率。然而，减少曝气的效果在较高的厌氧氨氧化物生物量的反应器中的TN去除效率是远远低于常规反应器。一氧化二氮（N2 O）的排放量是曝气的函数，以及，并在反应器中具有较高的厌氧氨氧化物生物量较低。q-PCR分析结果证实了硝化菌、厌氧氨氧化菌和厌氧消化菌在两个反应器中同时共存。为了模拟这些反应器中的TN去除作为曝气时间的函数，一个新的模型，基于一级反应动力学的反硝化和厌氧氨氧化的开发，并取得了良好的协议与实验观察。(C)2014爱思唯尔有限公司版权所有。
The possibility of using membrane bioreactors (MBRs) in simultaneous nitrification-anammox-denitrification (SNAD) by considering periodic aeration cycles was investigated. Two separate reactors were operated to investigate the effect of different anammox biomass in the presence of nitrifying and denitrifying biomass on the final nitrogen removal efficiency. The results illustrated that the reactor with higher anammox biomass was more robust to oxygen cycling. Around 98% Total Nitrogen (TN) and 83% Total Organic Carbon (TOC) removal efficiencies were observed by applying one hour aeration over a four-hour cycle. Decreasing the aeration time to 30, 15, and 2 min during a four-hour cycle affected the final TN removal efficiencies. However, the effect of decreasing aeration on the TN removal efficiencies in the reactor with higher anammox biomass was much lower compared to the regular reactor. The nitrous oxide (N2O) emission was a function of aeration as well, and was lower in the reactor with higher anammox biomass. The results of q-PCR analysis confirmed the simultaneous co-existence of nitrifiers, anammox, and denitrifiers in both of the reactors. To simulate the TN removal in these reactors as a function of the aeration time, a new model, based on first order reaction kinetics for both denitrification and anammox was developed and yielded a good agreement with the experimental observations. (C) 2014 Elsevier Ltd. All rights reserved.