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首页> 外文期刊>Environmental Science & Technology >Membrane biofouling in pilot-scale membrane bioreactors (MBRs) treating municipal wastewater: Impact of biofilm formation
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Membrane biofouling in pilot-scale membrane bioreactors (MBRs) treating municipal wastewater: Impact of biofilm formation

机译：处理市政废水的中试规模膜生物反应器（MBR）中的膜生物污染：生物膜形成的影响

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摘要

For more efficient control and prediction of membrane biofouling in membrane bioreactors (MBRs), a fundamental understanding of mechanisms of membrane biofouling is essential. In this study, we operated full-scale submerged MBRs using real municipal wastewater delivered from the primary sedimentation basin of a municipal wastewater treatment facility over 3 months, and the adhesion and formation of biofilms on 0.4-mu m pore size polyethylene hollow-fiber microfiltration (MF) membrane surfaces, separated from simple deposition of sludge cake, were monitored using scanning electron microscopy (SEM). In addition, the compositions of planktonic and biofilm microbial communities in the MBR were analyzed using culture independent molecular-based methods (i.e., fluorescent in situ hybridization (FISH) and 16S rRNA gene sequence analysis). The SEM and LIVE/DEAD staining analyses clearly showed that the biofilms gradually developed on the membrane surfaces with time, which had a strong positive correlation with the increase in trans-membrane pressure (TMP). This indicated that the biofilm formation induced the membrane fouling. The FISH results revealed that the microbial communities on membrane surfaces were quite different from those in the planktonic biomass in the mixed liquor. Moreover, FISH and 16S rRNA gene sequence analyses revealed that a specific phylogenetic group of bacteria, the Betaproteobacteria, probably played a major role in development of the mature biofilms, which led to the severe irreversible membrane biofouling.
机译：为了更有效地控制和预测膜生物反应器（MBR）中的膜生物污染，对膜生物污染机理的基本理解至关重要。在这项研究中，我们使用从市政废水处理设施的一级沉淀池输送的真实市政废水进行了3个月的全规模浸没式MBR，并在0.4微米孔径的聚乙烯中空纤维微滤膜上粘附并形成了生物膜。 （MF）膜表面与污泥饼的简单沉积分开，使用扫描电子显微镜（SEM）进行监测。此外，使用基于培养的独立分子方法（即荧光原位杂交（FISH）和16S rRNA基因序列分析）分析了MBR中浮游生物和生物膜微生物群落的组成。 SEM和LIVE / DEAD染色分析清楚地表明，生物膜随着时间的推移逐渐在膜表面形成，这与跨膜压（TMP）的增加有很强的正相关性。这表明生物膜的形成引起膜结垢。 FISH结果表明，膜表面的微生物群落与混合液中的浮游生物质有很大的不同。此外，FISH和16S rRNA基因序列分析表明，特定的系统发育细菌（β变形细菌）可能在成熟生物膜的形成中起主要作用，这导致了严重的不可逆膜生物结垢。

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