Lattice Boltzmann simulation of biofilm clogging and chemical oxygen demand removal in porous media

Zhiwei Tian, Junye Wang

Research output: Contribution to journalJournal Articlepeer-review

15 Citations (Scopus)

Abstract

Understanding mechanisms of controlling the bacteria growth and degradation of pollutants is critical for effective improvements in water treatment and bioremediation in porous media. In this study, we developed an integrated model of individual-based model and multicomponent lattice Boltzmann method to study interactions of oxygen, bioclogging, chemical oxygen demand (COD) removal, and their influence on growth and permeability of microbial biofilms. We found biofilm growth to be very heterogeneous on the surface of the solid matrix and pores. There is a biofilm porosity threshold. Beyond this threshold, the porosity of biofilm has no obvious influence on the flow rate and COD removal. We also studied the influence of initial cell populations, bulk oxygen concentration and biofilm permeability on the flow rate and COD removal. It demonstrated the capability of the present model to investigate biofilm growth, clogging and contaminants degradation in porous media, and its potential applications in water treatment.

Original languageEnglish
Article numbere16661
JournalAIChE Journal
Volume65
Issue number9
DOIs
Publication statusPublished - Sep. 2019

Keywords

  • COD removal
  • biofilm clogging
  • individual-based model
  • lattice Boltzmann method

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