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Characterization and modeling of the soluble microbial products in membrane bioreactor

机译：膜生物反应器中可溶性微生物产物的表征和建模

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摘要

The presence of soluble microbial products (SMP), including utilization-associated products (UAP) and biomass-associated products (BAP), is of great importance to membrane fouling problem. In this study, characterization and modeling of the SMP were conducted towards a better understanding of the production and composition of SMP in the membrane bioreactor (MBR). Based on the chemical analysis, both UAP and BAP exhibited the biodegradability and had a large fraction of molecular weight greater than 20kDa, thus hydrolysis was assumed as the first step for SMP utilization. The simulation of biological processes was described on the platform of activated sludge model 3 (ASM3) with two main modifications: (i) adopting the concept of simultaneous growth and storage of organic substrates by heterotrophic bacteria; (ii) introducing the formation and degradation of SMP into the biological processes. Batch experimental results were used for SMP parameter estimations, and simulation results showed that the model was able to describe the SMP dynamics and provide further insights into MBR operations. The effect of the sludge retention time (SRT) and hydraulic retention time (HRT) on the formation of SMP could therefore be analyzed by model simulation: a minimum SMP production with 25.1 mg COD/L was suggested at 40 days SRT and 8 h HRT.
机译：可溶性微生物产品（SMP）的存在，包括与利用有关的产品（UAP）和与生物质有关的产品（BAP），对于膜污染问题至关重要。在这项研究中，对SMP进行了表征和建模，以更好地了解膜生物反应器（MBR）中SMP的产生和组成。根据化学分析，UAP和BAP均具有生物降解性，且大部分分子量大于20kDa，因此水解被认为是SMP利用的第一步。在具有三个主要修改的活性污泥模型3（ASM3）平台上描述了生物过程的模拟：（i）采用异养细菌同时生长和存储有机底物的概念; （ii）将SMP的形成和降解引入生物过程。批处理实验结果用于SMP参数估计，仿真结果表明该模型能够描述SMP动力学并提供对MBR操作的进一步了解。因此，可以通过模型仿真分析污泥停留时间（SRT）和水力停留时间（HRT）对SMP形成的影响：建议在40天SRT和8 h HRT时最低SMP产量为25.1 mg COD / L 。

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