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Assessment of Heterotrophic Growth Supported by Soluble Microbial Products in Anammox Biofilm using Multidimensional Modeling

机译:使用多维建模评估厌氧生物膜中可溶性微生物产物支持的异养生长

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摘要

Anaerobic ammonium oxidation (anammox) is known to autotrophically convert ammonium to dinitrogen gas with nitrite as the electron acceptor, but little is known about their released microbial products and how these are relative to heterotrophic growth in anammox system. In this work, we applied a mathematical model to assess the heterotrophic growth supported by three key microbial products produced by bacteria in anammox biofilm (utilization associated products (UAP), biomass associated products (BAP), and decay released substrate). Both One-dimensional and two-dimensional numerical biofilm models were developed to describe the development of anammox biofilm as a function of the multiple bacteria–substrate interactions. Model simulations show that UAP of anammox is the main organic carbon source for heterotrophs. Heterotrophs are mainly dominant at the surface of the anammox biofilm with small fraction inside the biofilm. 1-D model is sufficient to describe the main substrate concentrations/fluxes within the anammox biofilm, while the 2-D model can give a more detailed biomass distribution. The heterotrophic growth on UAP is mainly present at the outside of anammox biofilm, their growth on BAP (HetB) are present throughout the biofilm, while the growth on decay released substrate (HetD) is mainly located in the inner layers of the biofilm.
机译:已知厌氧铵氧化(厌氧氨)以亚硝酸盐作为电子受体将铵自养转化为二氮气体,但鲜为人知的是它们释放的微生物产物以及这些产物与厌氧菌在厌氧菌系统中的生长有关。在这项工作中,我们应用数学模型评估了厌氧菌生物膜中细菌产生的三种关键微生物产品(利用相关产品(UAP),生物质相关产品(BAP)和腐烂释放的底物)所支持的异养生长。一维和二维数值生物膜模型的开发都描述了厌氧菌生物膜的发展是多种细菌-底物相互作用的函数。模型仿真表明,厌氧氨氧化铀是异养生物的主要有机碳源。异养菌主要在厌氧生物膜的表面占主导地位,而在生物膜内部则占很小的比例。一维模型足以描述厌氧生物膜中主要底物的浓度/通量,而二维模型可以提供更详细的生物量分布。 UAP的异养生长主要存在于厌氧菌生物膜的外部,它们在BAP(HetB)上的生长存在于整个生物膜中,而腐烂释放基质(HetD)的生长主要位于生物膜的内层。

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