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Advances in Environmental Research
  Volume 4, Number 3, October 2015, pages 183-196
open access

Migration of calcium hydroxide compounds in construction waste soil
Eunchul Shin and Jeongku Kang

    Migration of leachate generated through embankment of construction waste soil (CWS) in low-lying areas was studied through physical and chemical analysis. A leachate solution containing soluble cations from CWS was found to have a pH above 9.0. To determine the distribution coefficients in the alkali solution, column and migration tests were conducted in the laboratory. The physical and chemical properties of CWS satisfied environmental soil criteria; however, the pH was high. The effective diffusion coefficients for CWS ions fell within the range of 0.725 - 3.3 × 10-6 cm2/s. Properties of pore water and the amount of undissolved gas in pore water influenced advection.diffusion behavior. Contaminants migrating from CWS exhibited time-dependent concentration profiles and an advective component of transport. Thus, the transport equations for CWS contaminant concentrations satisfied the differential equations in accordance with Fick's 2nd law. Therefore, the migration of the contaminant plume when the landfilling CWS reaches water table can be predicted based on pH using the effective diffusion coefficient determined in a laboratory test.
Key Words
    calcium hydroxide; advection; diffusion; ICP-AES; contamination; construction waste soil
Department of Civil and Environmental Engineering, Incheon National University, 119 Academy-ro, Yeongsu-gu, Incheon 406-772, Republic of Korea.

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