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首页> 美国卫生研究院文献>Scientific Reports >Microbiomes and chemical components of feed water and membrane-attached biofilm in reverse osmosis system to treat membrane bioreactor effluents
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Microbiomes and chemical components of feed water and membrane-attached biofilm in reverse osmosis system to treat membrane bioreactor effluents

机译：反渗透系统中用于处理膜生物反应器废水的给水和膜生物膜的微生物组和化学成分

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Reverse osmosis (RO) system at a stage after membrane bioreactor (MBR) is used for the wastewater treatment and reclamation. One of the most serious problems in this system is membrane fouling caused by biofilm formation. Here, microbiomes and chemical components of the feed water and membrane-attached biofilm of RO system to treat MBR effluents were investigated by non-destructive confocal reflection microscopy, excitation-emission fluorescence spectroscopy and high-throughput sequencing of 16S rRNA genes. The microscopic visualization indicated that the biofilm contained large amounts of microbial cells (0.5 ± 0.3~3.9 ± 2.3 µm3/µm2) and the extracellular polysaccharides (3.3 ± 1.7~9.4 ± 5.1 µm3/µm2) and proteins (1.0 ± 0.2~1.3 ± 0.1 µm3/µm2). The spectroscopic analysis identified the humic and/or fulvic acid-like substances and protein-like substances as the main membrane foulants. High-throughput sequencing showed that Pseudomonas spp. and other heterotrophic bacteria dominated the feed water microbiomes. Meanwhile, the biofilm microbiomes were composed of diverse bacteria, among which operational taxonomic units related to the autotrophic Hydrogenophaga pseudoflava and Blastochloris viridis were abundant, accounting for up to 22.9 ± 4.1% and 3.1 ± 0.4% of the total, respectively. These results demonstrated that the minor autotrophic bacteria in the feed water played pivotal roles in the formation of polysaccharide- and protein-rich biofilm on RO membrane, thereby causing membrane fouling of RO system.
机译：膜生物反应器（MBR）用于废水处理和再生后的阶段的反渗透（RO）系统。该系统中最严重的问题之一是由生物膜形成引起的膜污染。在这里，通过非破坏性共聚焦反射显微镜，激发-发射荧光光谱法和高通量测序16S rRNA基因，研究了用于处理MBR废水的反渗透系统给水和膜生物膜的微生物组和化学成分。显微镜下可见，生物膜中含有大量的微生物细胞（0.5±0.3〜3.9±2.3 µm 3 / µm 2 ）和细胞外多糖（3.3±1.7〜）。 9.4±5.1 µm 3 / µm 2 ）和蛋白质（1.0±0.2〜1.3±0.1 µm 3 / µm 2 ）。光谱分析确定了腐殖酸和/或黄腐酸样物质和蛋白样物质是主要的膜污染物质。高通量测序表明为假单胞菌。和其他异养细菌主导了进水微生物组。同时，生物膜微生物群由多种细菌组成，其中与自养假单胞菌和拟绿藻相关的操作分类单元丰富，分别占总数的22.9％±4.1％和3.1％±0.4％。这些结果表明，给水中的少量自养细菌在反渗透膜上富含多糖和蛋白质的生物膜的形成中起着关键作用，从而导致反渗透系统的膜污染。

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