4.8 Article

Biofilm with highly heterogeneous interior structure for pollutant removal: Cell distribution and manipulated mass transport

期刊

BIORESOURCE TECHNOLOGY
卷 343, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125913

关键词

Interior structure; Multiple staining; 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]

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This study established a three-dimensional biofilm model and evaluated the local fluid flow velocity and pollutant diffusion and reaction fluxes inside the biofilm. It was found that both uniform structured and previously proposed heterogeneous models overestimated the performance of biofilms in wastewater treatment. The survival strategies of living cells in biofilms were discussed, including exposure to fresh pollutants and the tendency to form small aggregates for reducing diffusional resistance.
Biofilm wastewater treatment had been applied in practice. Conventionally the biofilm was modeled as a uniform structure to simplify the analysis. This study for the first time established a three-dimensional biofilm model with distributions separating living cells, Extracellular polymeric substances (EPS) and pores, based on which the local fluid flow velocity and pollutant diffusion and reaction fluxes inside the biofilm were numerically evaluated. Both the uniform structured and previously proposed heterogeneous models had been confirmed to overestimate the performances of a biofilm for wastewater treatment. The survival strategies of living cells in biofilm were discussed. Besides exposing to fresh pollutants for maximizing pollutant uptake, the tendency to form small aggregates of cells for shortening diffusion length so furnishing the pollutant with reduced diffusional resistance to living cells was also for the first time noted. This communication advanced the knowledge to comprehend the detailed processes in biofilm.

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