MEASUREMENT OF COPPER SOLUTION TRANSPORT IN A SAND COLUMN BY MEANS OF A FIBRE-OPTIC SENSOR AND ANALYSIS OF THE BREAKTHROUGH CURVE

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  • SASAKI SEIICHI
    Department of Environmental　and Civil Engineering, Wakayama National College of Technology
  • LYNCH ROD
    Geotechnical and Environmental Engineering Group, Engineering Department, Cambridge University

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This paper deals with the measurement of copper contaminant migration in soils by means of a fibre-optic sensor operating with yellow light buried in the soil. The resulting breakthrough curve is compared with a numerical analysis using the advection-dispersion equation. In order to examine the copper adsorption properties, a batch experiment was carried out. It was found that the copper adsorption on silica sand follows a Langmuir model at high concentration. The copper dispersion coefficient was estimated from the plume shape, assuming that a Gaussian distribution of concentration is applicable to the copper plumes. It is demonstrated that the measured breakthrough curve is in reasonable agreement with the one calculated from the dispersion coefficient or the longitudinal dispersivity and retardation factor measured by the batch method. The retardation factor is observed to decrease sharply with increasing concentration of copper solution up to 10 (g/L).

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