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Modeling Copper and Cadmium Mobility in an Albeluvisol Amended with Urban Waste Composts

Abstract : Two experimental plots amended with a co-compost of sewage sludge and green wastes (SGW) or with a municipal solid waste compost (MSW) were compared with a control plot without organic amendment (CONT) in terms of trace metals mobility. These plots were equipped with wick lysimeters, time-domain reflectometry probes and tensiometers for 6 yr (2004–2010). Different soil structures due to tillage and compost incorporation were identified in the tilled layers and reproduced in HYDRUS-2D for simulating water, Cu, and Cd transport. Two sorption estimation approaches were used, either assuming equilibrium between CaCl2 and ethylenediaminetetraacetic acid (EDTA) extractable metals (Kd-1) or using equations based on pedotransfer functions assuming nonlinear sorption for Cu (Kf) and linear sorption for Cd (Kd-2). Lysimeter data on Cu leaching were successfully reproduced with the Kd-1 approach for the SGW and CONT plots (model efficiency coefficient ESGW = 0.97, ECONT = 0.95), while the MSW plot showed better fitting with the Kf approach (EMSW = 0.77), which could be explained by the less stable organic matter of the MSW compost because it takes into account organic matter components (dissolved organic C and soil organic matter). The Cd leaching was reproduced with the Kd-2 approach for the two amended plots (ESGW = 0.12, EMSW = 0.80), while CONT simulation overestimated leaching. The percentage of measured Cu and Cd leached in reference to input mass was 0.6 and 2.7%, respectively, in the SGW plot compared with 5% for both metals in the MSW plot. Trace metal mobility appeared to be limited in the tilled layer by sorption to organic matter.
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Vilim Filipović, Philippe Cambier, Lana Filipović, Yves Coquet, Valérie Pot, et al.. Modeling Copper and Cadmium Mobility in an Albeluvisol Amended with Urban Waste Composts. Vadose Zone Journal, Soil science society of America - Geological society of America., 2016, 15 (12), 15 p. ⟨10.2136/vzj2016.07.0056⟩. ⟨insu-01478332⟩



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