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Metagenomic insights into the explanation of biofilter performance distinction induced by dissolved oxygen increment
Process Safety and Environmental Protection ( IF 7.8 ) Pub Date : 2021-07-24 , DOI: 10.1016/j.psep.2021.07.035
Shiyang Zhang 1 , Jing Chen 1 , Wenjiao Sang 1 , Meng Li 1 , Veljko Prodanovic 2 , Kefeng Zhang 2
Affiliation  

In this study, a set of novel double-layer-packed sequencing batch biofilm reactors (SBBRs) were constructed to treat secondary effluent with a low carbon-to-nitrogen ratio (C/N = 3.0). All the reactors were operated under identical conditions except dissolved oxygen (DO) in the aerobic section, which was controlled at seven different levels (0.5, 1.0, 1.5, 2.0, 2.5, 3.5 and 4.5 mg/L). It was found that the aerobic section contributed most to performance at an optimal DO of 2.0 mg/L. The change in DO accounted for the varied bacterial communities, which resulted in different performances. Both bacterial community structure and potential functions displayed close associations with performance implying nutrients were mainly removed by simultaneous nitrification-endogenous denitrification and phosphorus removal (SNEDPR) process. Moreover, the proliferation of nonfunctional nitrifiers/denitrifiers led to the inhibition of denitrification resulting in a lower removal of total dissolved nitrogen and phosphorus.



中文翻译:

对由溶解氧增加引起的生物过滤器性能差异的解释的宏基因组学见解

在本研究中,构建了一套新型双层填料序批式生物膜反应器(SBBR)来处理低碳氮比(C/N = 3.0)的二级出水。除好氧段溶解氧(DO)控制在七个不同水平(0.5、1.0、1.5、2.0、2.5、3.5和4.5mg/L)外,所有反应器均在相同条件下运行。结果表明,在 2.0 mg/L 的最佳 DO 下,有氧部分对性能的贡献最大。DO 的变化解释了不同的细菌群落,从而导致不同的表现。细菌群落结构和潜在功能都与性能密切相关,这意味着营养物质主要通过同步硝化-内源反硝化和除磷 (SNEDPR) 过程去除。而且,

更新日期:2021-07-28
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