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Martijn van Praagh. Photo.

Martijn van Praagh

Adjunct senior lecturer

Martijn van Praagh. Photo.

Water and solute movement in air pollution control residues measured by time domain reflectometry.

Author

  • Martijn van Praagh
  • Magnus Persson
  • Kenneth M Persson

Summary, in English

The mobility of pollutants from air pollution control (APC) residues is strongly influenced by its contact with water. This study aims to verify the applicability of time-domain reflectometry (TDR) to infer water and solute movement in situ in an APC residue–compost mixture in a laboratory column. The calibrated dielectric permittivity–volumetric water content relationship (K−thetav) for the material shows a distinct plateau at midrange volumetric water contents, which are underestimated by Topp's K−thetav model throughout the studied range. The coating of probes enables a clear TDR signal collection and analysis up to electrical conductivity values of 280 mS cm−1. Heterogeneities in packing and channel flow in the column are revealed by TDR measurements. Water contents inferred by TDR signal analysis require careful interpretation when used in materials such as APC residues, due to the high amount of water bound in the hydration shells of ions released into the pore water.

Department/s

  • Division of Water Resources Engineering

Publishing year

2007

Language

English

Pages

750-757

Publication/Series

Journal of Environmental Engineering

Volume

133

Issue

7

Document type

Journal article

Publisher

ASCE

Topic

  • Water Engineering

Keywords

  • Air pollution
  • Time factors
  • Waste management
  • Leaching
  • In situ tests
  • Water flow
  • Water pollution

Status

Published

ISBN/ISSN/Other

  • ISSN: 0733-9372