4.8 Article

Biofilm with highly heterogeneous interior structure for pollutant removal: Effects of individual extracellular polymeric substance

期刊

BIORESOURCE TECHNOLOGY
卷 361, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127669

关键词

Interior structure; Diffusion; Convection; Performance

资金

  1. National Natural Science Foundation of China [51936004]
  2. Science Fund for Creative Research Groups of the National Natural Science Foundation of China [51821004]
  3. Fundamental Research Funds for the Central Universities [2020MS063]
  4. City University of Hong Kong grant [SGP-9380141]

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This study reveals the effects of a specific component of extracellular polymeric substances on the substrate consumption rates by the embedded cells in a highly heterogeneous interior structure of a working biofilm. It suggests strategies to maximize the biofilm performance.
For the first time, this study reveals the effects of an individual component of extracellular polymeric substances on the substrate consumption rates by the embedded cells based on the highly heterogeneous interior structures of a working biofilm. The flow-across mode in operation established a boundary-layer flow field with high transport resistance, making the uniformly structured model valid. Conversely, the flow field of the flow-through mode is determined by 46% jointly by proteins and beta-D-glucopyranose polysaccharides. The substrate con-sumption rates hindered by beta-D-glucopyranose polysaccharide is up to 60% over the 20%-40% biofilm height from the bottom, much lower than expected by the uniformly structured models. The strategies to maximize the biofilm performance have been suggested.

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