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首页> 外文期刊>Environmental Science & Technology >Temperature-Tolerated Mainstream Nitrogen Removal by Anammox and Nitrite/Nitrate-Dependent Anaerobic Methane Oxidation in a Membrane Biofilm Reactor
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Temperature-Tolerated Mainstream Nitrogen Removal by Anammox and Nitrite/Nitrate-Dependent Anaerobic Methane Oxidation in a Membrane Biofilm Reactor

机译：膜生物膜反应器中厌氧和亚硝酸盐/硝酸盐依赖性厌氧甲烷氧化去除温度容许的主流氮

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The mainstream anaerobic ammonium oxidation (anammox) process provides strong support to the on-going paradigm shift from energy-negative to energy-neutral in wastewater treatment plants. However, the low temperature (e.g., below 15 ℃) represents one of the major challenges for mainstream anammox in practice. In this study, a stable nitrogen removal rate (0.1.3 kg m~~(-3) day~(-1)), together with a high-level effluent quality (<5.0 mg N L~(-1)), was achieved in a lab-scale upflow membrane biofilm reactor (MBfR) by coupling anammox with nitriteitrate-dependent anaerobic methane oxidation (n-DAMO) microorganisms, at a temperature as low as 10 ℃. With the temperature being progressively decreased from 25 to 10 ℃, the total nitrogen removal efficiency was maintained in the range of 90-94% at a constant hydraulic retention time of 9 h. The impact of temperature on the biofilm system coupling anammox and n-DAMO reactions increased at a lower temperature range with higher Arrhenius coefficients. Additionally, 16S rRNA gene sequencing results showed that anammox bacteria, n-DAMO bacteria, and n-DAMO archaea jointly dominated the biofilm, and their respective abundances remained relatively stable when the temperature was decreased. The major reason for this temperature-tolerated performance is the overcapacity developed, which is indicated by biofilm thickness measurements and mathematical modeling. The stable performance obtained in this study shows promise for the n-DAMO application in domestic wastewater.
机译：主流的厌氧铵氧化（anammox）工艺为废水处理厂中正在进行的从负能量到零能量的范式转变提供了有力的支持。然而，低温（例如低于15℃）代表了主流厌氧氨纶在实践中的主要挑战之一。在这项研究中，稳定的脱氮率（0.1.3 kg m ~~（-3）天〜（-1））和高水平的出水水质（<5.0 mg NL〜（-1））被确定为在低至10℃的温度下，通过将厌氧氨气与亚硝酸盐/硝酸盐依赖性厌氧甲烷氧化（n-DAMO）微生物偶联，在实验室规模的上流膜生物膜反应器（MBfR）中实现。随着温度从25℃逐渐降低到10℃，在恒定的9 h水力停留时间下，总氮去除率保持在90-94％的范围内。温度在较低的温度范围内以较高的Arrhenius系数增加了对厌氧菌和n-DAMO反应耦合的生物膜系统的影响。此外，16S rRNA基因测序结果表明，厌氧细菌，n-DAMO细菌和n-DAMO古细菌共同控制着生物膜，并且当温度降低时它们各自的丰度保持相对稳定。这种耐温性能的主要原因是产生的容量过大，这由生物膜厚度测量和数学模型表明。这项研究获得的稳定性能显示了将其应用于生活污水中的前景。

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