Soil attenuation of acid phase landfill leachate |
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| Affiliation: | 1. Department of Environmental Engineering, Building 115, Technical University of Denmark, DK-2800 Lyngby, Denmark;1. Imdea Water, Av. Punto Com 2, 28805 Alcalá de Henares, Madrid, Spain;2. Alterra, Department of Climate Change and Adaptive Land and Water Management– CALM, Droevendaalsesteeg, 6708 PB Wageningen, The Netherlands;3. University of Rey Juan Carlos, ESCET, Department of Biology and Geology, C/Tulipán s/n, 28933 Madrid, Spain;4. University of Alcalá, Department of Geology, Geography and Environment, Ctra. A-II km 33,600 28871 Alcalá de Henares, Madrid, Spain;1. Department of Civil, Environmental and Mechanical Engineering, University of Trento, via Mesiano, 77, 38123 Trento, Italy;2. Agenzia per la Depurazione, Autonomous Province of Trento, via S. Giovanni 36, 38122 Trento, Italy;3. Centre for Integrative Biology (CIBIO), University of Trento, Via delle Regole 101, Mattarello, 38123 Trento, Italy;1. Environmental Nanoscience Laboratory, Department of Earth Sciences, Indian Institute of Science Education and Research Kolkata, Kolkata, Mohanpur, West Bengal, 741246, India;2. Centre for Climate and Environmental Studies, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, 741246, India;1. Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, BC V6T 1Z4, Canada;2. Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada |
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| Abstract: | Groundwater contamination is the major environmental risk related to landfilling of wastes. In order to evaluate the migration of leachate from uncontrolled dumps and to establish efficient groundwater monitoring systems at sanitary landfills, basic information about the behaviour of pollutants in soil-groundwater systems is needed. A series of saturated laboratory soil columns loaded with acid phase leachate under anaerobic CO2-saturated conditions were studied in terms of solute breakthrough curves and final pollutant soil profiles. The four soils studied exhibited significantly different capacities for attenuating leachate pollutants. In general, ammonia, sodium and boron were attenuated only by adsorption and organic matter by a combination of adsorption and degradation. Dissolved solids, specific conductivity, potassium, calcium, magnesium, iron and manganese were, besides adsorption, subject to precipitation-dissolution processes. For iron and manganese the latter process was in combination with redox processes. Zinc and cadmium were extensively attenuated probably due to a combination of adsorption and sulphide precipitation. With a few exceptions, chloride, dissolved solids, specific conductivity, organic matter (COD) and sodium are the most mobile constituents of the leachate exhibiting migration velocities of 80–100% of the water flow velocity. |
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