Show simple item record Dikinya, O. Hinz, C. Aylmore, G. 2010-06-08T09:58:43Z 2010-06-08T09:58:43Z 2008
dc.identifier.citation Dikinya, O. et al (2008) Decrease in hydraulic conductivity and particle release associated with self-filtration in saturated soil columns, Geoderma, Vol. 146, p.192-200 en_US
dc.identifier.issn 0016 7061
dc.description.abstract The dynamics of the process of self-filtration in soil columns have been evaluated for two soils with different structural cohesion (Balkuling agricultural soil and a mining residue) by carrying out experiments focusing on microscopic particle behaviour during filtration. Soil column experiments were set up to simultaneously measure changes in hydraulic gradients (ΔH/ΔL) along the columns and outflow particle sizes and concentrations during pressure leaching with solutions of 100, 10 and 1 mmol/L NaCl and deionised water. The lowest ionic strength has resulted in more reduced hydraulic conductivity and relatively more release of colloids associated with hydrodynamic shear and dispersion. Steady increases in hydraulic gradient (ΔH/ΔL) and corresponding decreases in relative saturated hydraulic conductivity (K/Ko) with time were observed for both soils and follow similar trends at all column depths. The most severe increases in ΔH/ΔL and decreases in K/Ko always occurred near the inlet to the columns and the decline gradually decreased along the column. The decrease in K/Ko and increase in ΔH/ΔL were clearly influenced by the size as well as the concentration of migrating particles in the porous medium. The finer mobile particles in the mining residue were clearly more readily self-filtered at the lower concentration than the larger Balkuling soil particles producing more rapid increases in ΔH/ΔL and decreases in K/Ko. This was attributable to more effective self-filtration and more pore clogging probably due to increased development of the diffuse double layer, swelling and dispersion within the soil matrix at these concentrations. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Saturated hydraulic conductivity en_US
dc.subject Self-filtration en_US
dc.subject Pore clogging en_US
dc.subject Particle migration en_US
dc.subject Particle release en_US
dc.subject Deposition en_US
dc.title Decrease in hydraulic conductivity in saturated soil columns and particle release associated with self-filtration in saturated soil columns en_US
dc.type Published Article en_US

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