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Modeling geosmin removal in a full-scale filter.

Juliana A Coelho1, Diana Cristina S DE Azevedo1, Ivanildo JosÉ DA Silva Junior1

  • 1Universidade Federal do Ceara, Departamento de Engenharia Química, Campus do Pici, Bloco 709, Av. Mister Hull, s/n, Pici, 60455-760 Fortaleza, CE, Brazil.

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Granular activated carbon (GAC) filters effectively remove taste and odor compounds like geosmin from drinking water. This study models GAC filter performance, crucial for designing effective water treatment systems.

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Area of Science:

  • Environmental Science
  • Water Treatment Engineering
  • Adsorption Technology

Background:

  • Taste and odor compounds in drinking water impact consumer perception and safety.
  • Powdered activated carbon (PAC) is common but generates significant sludge.
  • Granular activated carbon (GAC) offers an alternative, but filter design requires further study.

Purpose of the Study:

  • To model the removal of geosmin, a common taste and odor compound, using GAC.
  • To investigate the adsorption kinetics and isotherms of geosmin on various activated carbons.
  • To simulate the performance of a full-scale GAC filter for geosmin removal.

Main Methods:

  • Utilized the homogeneous surface diffusion model (HSDM) for bench-scale experiments.
  • Conducted kinetic and isotherm adsorption experiments with geosmin.
  • Simulated geosmin removal in a full-scale GAC filter using model parameters.

Main Results:

  • Geosmin adsorption was best described by the Freundlich model for all tested carbons.
  • Film resistance (Kf) was found to be more critical for adsorption kinetics than pore diffusion (Ds).
  • Simulations predicted GAC filter breakthrough times for different influent geosmin concentrations.

Conclusions:

  • The Freundlich model accurately represents geosmin adsorption on GAC.
  • Film resistance plays a key role in the adsorption rate of geosmin.
  • HSDM modeling provides valuable insights for designing GAC filters to manage taste and odor compounds.