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首页> 外文期刊>Bioprocess and Biosystems Engineering >Factors affecting simultaneous nitrification and denitrification (SND) in a moving bed sequencing batch reactor (MBSBR) system as revealed by microbial community structures
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Factors affecting simultaneous nitrification and denitrification (SND) in a moving bed sequencing batch reactor (MBSBR) system as revealed by microbial community structures

机译：在微生物群落结构揭示的情况下，影响运动床测序批量反应器（MBSBR）系统中同时硝化和脱氮（SND）的因素

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摘要

The effects of biological factors including dissolved oxygen (DO), pH, carbonitrogen (C/N) and hydraulic retention times (HRT) on the performance of simultaneous nitrification and denitrification (SND) in a moving bed sequencing batch reactor (MBSBR) were investigated. A low DO was found to be advantageous to the SND in that nitrification was not inhibited, while pH and C/N ratio were shown to have positive effects on SND, and HRT needed to be controlled in a suitable range. A desirable SND efficiency was obtained at a DO of 2.5 mg L-1, pH of approximately 8.0, C/N ratio of 10 and HRT of 10 h in the MBSBR. High-throughput sequencing analysis showed that different operating conditions impacted microbial communities, resulting in different nitrogen removal mechanisms. Autotrophic and heterotrophic nitrification together contributed to the good nitrification performance, while denitrification was conducted by combined anoxic and aerobic processes. Furthermore, the results of principal component analyses (PCA) and the abundance of the predominant nitrification and denitrification genera both showed that DO and HRT might be regarded as the dominant variable factors influencing community structure analysis during SND, while the linear discriminant analysis (LDA) effect size (LEfSe) algorithm showed differences in abundance among the biofilm microbial communities with different DO. Overall, the results of this study improve our understanding of the bacterial community structure with different operating conditions in MBSBRs.
机译：生物因子包括溶解氧（DO），pH，碳/氮（C / N）和液压保留时间（HRT）在运动床测序批量反应器中同时硝化和反硝化（SND）的性能（MBSBR）的性能的影响被调查了。发现低的表现在不抑制硝化的SND中是有利的，而pH和C / N比显示对SND的阳性作用，并且需要在合适的范围内控制HRT。在MBSBR中，在2.5mg L-1，pH值约为8.0，C / N比10和HRT的10％和HRT的25℃，pH值的DO中获得了所需的SND效率。高通量测序分析表明，不同的操作条件影响了微生物群落，导致不同的氮去除机制。自营养和异养硝化在一起导致良好的硝化性能，而通过组合的缺氧和有氧方法进行脱氮。此外，主成分分析（PCA）的结果和主要硝化和脱氮属的丰度显示，DO和HRT可能被认为是影响SND期间群落结构分析的主要可变因素，而线性判别分析（LDA）效果大小（lefse）算法显示出生物膜微生物群落中丰富的差异不同。总体而言，这项研究的结果改善了我们对MBSBRS中不同操作条件的细菌群落结构的理解。

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