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Impact of filamentous bacteria on properties of activated sludge and membrane-fouling rate in a submerged MBR

机译：淹没式MBR中丝状细菌对活性污泥特性和膜污染速率的影响

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摘要

This study presents the results from the continuous microfiltration of activated sludge with different filamentous bacteria density(expressed as filament index(FT))in a submerged membrane bioreactor(MBR).During the entire experimental duration of 120 days,the filamentous bacteria density increased gradually from FI=2 to 6 in the beginning,thereafter maintained at a plateau of FI=6 for about 20 days,and decreased to FI=4 at the end of the experiment.The relationship between FI and other properties of activated sludge were analysed using statistical analysis.It was found that filamentous bacteria density has no significant effect on bound extracellular polymeric substances(bound EPS,r_p=-0.343,p=0.080)and soluble microbial products(SMPs,r_p=0.221,p=0.267).However,it has an important impact on floe size(r_p=0.944,p=0.000)and floe structure(r_p=-0.752,p=0.000).High FI favored the formation of bigger floes with a loose structure,and vice versa.Further studies on the impact of the activated sludge properties on membrane-fouling rate indicated that variations of the bound EPS may be the major factor contributing to the membrane-fouling rate.Although filamentous bacteria have the ability to change the floe morphology,the effect on the membrane-fouling rate may be negligible.
机译：本研究提供了在浸没式膜生物反应器（MBR）中对具有不同丝状细菌密度（以丝状指数（FT）表示）的活性污泥进行连续微滤的结果。在120天的整个实验过程中，丝状细菌密度逐渐增加从FI = 2开始至FI-6，然后在FI = 6的平台上维持约20天，并在实验结束时降低至FI = 4。使用活性污泥分析FI与其他特性之间的关系统计分析发现丝状细菌密度对结合的细胞外聚合物（结合的EPS，r_p = -0.343，p = 0.080）和可溶性微生物产物（SMPs，r_p = 0.221，p = 0.267）没有显着影响。它对絮凝物的大小（r_p = 0.944，p = 0.000）和絮凝物的结构（r_p = -0.752，p = 0.000）有重要影响。高FI有利于形成具有疏松结构的较大絮凝物，反之亦然。对激活的影响污泥特性对膜污染率的影响表明，结合EPS的变化可能是影响膜污染率的主要因素。尽管丝状细菌具有改变絮凝形态的能力，但对膜污染率的影响可以忽略不计。 。

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