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Irrigation of soil with synthetic landfill leachate-breakthrough behaviour of selected pollutants



Irrigation of soil with synthetic landfill leachate-breakthrough behaviour of selected pollutants



Water Air & Soil Pollution 109(1-4): 327-342



A leaching column experiment was conducted to investigate the feasibility of soil irrigation with landfill leachate as a decontamination technology. A loamy sand was irrigated with synthetic landfill leachates with and without phenol, zinc and copper and combinations thereof. Irrigation was applied at a rate of one pore volume twice per week for 18 weeks, equivalent to a total application of 1165 mm. Electrical conductivity in all column effluents was lower than in the influent solutions. Changes in effluent pH with increasing numbers of pore volume displacements were influenced by the presence of zinc and phenol and could be adequately modelled using cubic response functions. Copper was totally removed from the leachates by passage through the soil as was zinc during the first few pore volume displacements. Later, however, zinc was detected in the column effluents in concentrations close to or greater than those of the influent solutions. In the presence of phenol zinc mobility was enhanced. Zinc response to number of pore volume displacements was effectively represented by Gompertz functions. The phenol concentrations of the leachates were reduced by 30 to 50% by passage through the soil columns. The results demonstrated that removal of pollutants from landfill leachates by passage through a soil with a low attenuation potential was moderate to high. Therefore, soil irrigation with landfill leachate may be an effective purification technique provided that it is practiced with caution, and consideration is given to soil and leachate properties.

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Accession: 010885812

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