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首页> 外文期刊>Separation and Purification Technology >A comprehensive study on membrane fouling in submerged membrane bioreactors operated under different aeration intensities
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A comprehensive study on membrane fouling in submerged membrane bioreactors operated under different aeration intensities

机译：不同曝气强度下浸没式膜生物反应器中膜污染的综合研究

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摘要

In this paper, membrane fouling in three parallel MBRs operated under different aeration intensities (150, 400 and 800 L/h) was studied to have a better understanding of the membrane fouling mechanism. The impact of aeration on membrane fouling was interpreted from two aspects: evolution of biomass characteristics and formation mechanism of the cake layer. The results showed that either small or large aeration intensity had a negative influence on membrane permeability. The large aeration intensity resulted in a severe breakup of sludge flocs, and promoted the release of colloids and solutes from the microbial flocs to the bulk solution. The sludge supernatant would become heterogeneous as the aeration intensity increased. As the MBR operated under high aeration intensity of 800 L/h, colloids and solutes became the major foulants. In addition, the back transport mechanism of membrane foulants in the three MBRs was different from each other. Aeration had a positive effect on cake layer removal, but pore blocking became severe as aeration intensity increased to 800 L/h. The main components of organic matters in the membrane foulants were identified as proteins, polysaccharide materials and lipids by the Fourier transform infrared spectroscopy (FTIR).
机译：在本文中，研究了三种在不同曝气强度（150、400和800 L / h）下运行的平行MBR的膜污染情况，以更好地了解膜污染机理。从两个方面解释了曝气对膜污染的影响：生物质特性的演变和滤饼层的形成机理。结果表明，通气强度大小对膜的渗透性都有负面影响。大的曝气强度导致污泥絮凝物严重破裂，并促进了胶体和溶质从微生物絮凝物释放到本体溶液中。随着曝气强度的增加，污泥上清液将变得异质。由于MBR在800 L / h的高曝气强度下运行，胶体和溶质成为主要污垢。此外，在三个MBRs中，膜污染物质的反向运输机制彼此不同。曝气对滤饼层的去除有积极作用，但随着曝气强度增加到800 L / h，孔堵塞变得严重。膜污染物质中有机物的主要成分通过傅立叶变换红外光谱（FTIR）鉴定为蛋白质，多糖物质和脂质。

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