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首页> 外文期刊>Journal of Biotechnology >Distribution and composition of extracellular polymeric substances in membrane-aerated biofilm
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Distribution and composition of extracellular polymeric substances in membrane-aerated biofilm

机译：膜通气生物膜中细胞外聚合物的分布和组成

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摘要

Extracellular polymeric substances (EPS) are one of the main components of the biofilm and perform important functions in the biofilm system. In this study, two membrane-aerated biofilms (MABs) were developed for the thin and thick biofilms under different surface loading rates (SLRs). Supplies of oxygen and substrates in the MAB were from two opposite directions. This counter diffusion of nutrients resulted in a different growth environment, in contrast to conventional biofilms receiving both oxygen and substrates from the same side. The compositions, distributions and physicochemical properties (solubility and bindability) of EPS in the MABs of different thicknesses under different SLRs were studied. The effect of dissolved oxygen (DO) concentration within the MAB on EPS properties and distribution was investigated. Experimental results showed the different biofilm thicknesses produced substantially different profiles of EPS composition and distribution. Soluble proteins were more dominant than soluble polysaccharides in the inner aerobic layer of the biofilms; in contrast, bound proteins were greater than bound polysaccharides in the outer anoxic or anaerobic layer of the biofilms. The biofilm-EPS matrix consisted mainly of bound EPS. Bound EPS exhibited a hump-shaped profile with the highest content occurring in an intermediate region in the thin MAB and relatively more uniformly in the one half of the biofilm close to the membrane side and then declined towards the biofilm-liquid interface in the thick MAB. The profiles of soluble EPS presented a similar declining trend from the membrane towards the outer region in both thin and thick MABs. The study suggested that not only EPS composition but also EPS distribution and properties (solubility and bindability) played a crucial role in controlling the cohesiveness and maintaining the structural stability and stratification of the MABs.
机译：细胞外聚合物（EPS）是生物膜的主要成分之一，在生物膜系统中起重要作用。在这项研究中，针对不同表面负荷率（SLR）的薄和厚生物膜开发了两种膜充气生物膜（MAB）。 MAB中的氧气和底物供应来自两个相反的方向。与常规生物膜从同一侧同时接收氧气和底物相比，这种相反的养分扩散导致了不同的生长环境。研究了不同单反条件下不同厚度MAB中EPS的组成，分布和理化性质（溶解性和结合性）。研究了MAB中溶解氧（DO）浓度对EPS性能和分布的影响。实验结果表明，不同的生物膜厚度产生了基本不同的EPS组成和分布曲线。在生物膜的内部需氧层中，可溶性蛋白比可溶性多糖更具优势。相反，在生物膜的外部缺氧或厌氧层中，结合蛋白大于结合多糖。生物膜-EPS基质主要由结合的EPS组成。结合的EPS表现出峰状的轮廓，含量最高的发生在薄MAB的中间区域，并且在靠近膜侧的一半生物膜中相对更均匀，然后朝厚MAB的生物膜-液体界面下降。在薄的和厚的MAB中，可溶性EPS的分布呈现出从膜向外部区域相似的下降趋势。该研究表明，不仅EPS组成，而且EPS分布和特性（溶解性和可结合性）在控制MAB的内聚力，维持结构稳定性和分层方面都起着至关重要的作用。

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