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Bioremediation00:46

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Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...

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Related Experiment Video

Updated: Jun 24, 2026

Engineering Adherent Bacteria by Creating a Single Synthetic Curli Operon
15:28

Engineering Adherent Bacteria by Creating a Single Synthetic Curli Operon

Published on: November 16, 2012

Enhanced biofiltration using cell attachment promotors.

Juan J Goncalves1, Rakesh Govind

  • 1Department of Chemical and Materials Engineering, 620 Rhodes Hall, University of Cincinnati, Cincinnati, Ohio 45221-0012, USA.

Environmental Science & Technology
|March 27, 2009
PubMed
Summary
This summary is machine-generated.

Polyethyleneimine (PEI) coated filters significantly improved hydrogen sulfide (H2S) removal in biotrickling filters, achieving high efficiencies and enhanced microbial activity for cleaner air.

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Last Updated: Jun 24, 2026

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Immobilization of Multi-biocatalysts in Alginate Beads for Cofactor Regeneration and Improved Reusability
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Methods for Characterizing the Co-development of Biofilm and Habitat Heterogeneity
09:21

Methods for Characterizing the Co-development of Biofilm and Habitat Heterogeneity

Published on: March 11, 2015

Area of Science:

  • Environmental Engineering
  • Biotechnology
  • Microbiology

Background:

  • Hydrogen sulfide (H2S) is a common air pollutant requiring effective removal strategies.
  • Biotrickling filters (BTFs) are a promising technology for treating H2S-polluted airstreams.
  • Polyurethane (PU) foam is a common packing material in BTFs.

Purpose of the Study:

  • To evaluate the impact of polyethyleneimine (PEI) coating on PU foam in BTFs for H2S removal.
  • To compare the performance of PEI-coated and uncoated BTFs.
  • To investigate the microbial community and removal mechanisms in the BTFs.

Main Methods:

  • Two biotrickling filter columns were used: one with PEI-coated PU foam and one with uncoated PU foam.
  • Experiments were conducted at varying empty bed residence times (EBRT) and H2S inlet concentrations.
  • Removal efficiency (RE), elimination capacity (EC), and volatile solids (VS) retention were measured.
  • Denaturing gradient gel electrophoresis (DGGE) was used for microbial analysis.

Main Results:

  • Both reactors achieved high H2S removal efficiencies (90-100%) over 125 days.
  • The PEI-coated reactor demonstrated superior acclimatization characteristics compared to the uncoated reactor.
  • Maximum EC (77 gH2S/m3bed/h) and VS retention (42 mgVS/cube) were observed in the coated reactor.
  • Acidithiobacillus was identified as the dominant genus in both filter units.

Conclusions:

  • PEI coating enhances the performance of PU foam in BTFs for H2S removal.
  • The coated reactor offers improved efficiency and microbial retention.
  • This study provides insights into H2S removal mechanisms and microbial dynamics in BTFs.