Valorization of extracted organic matter from municipal solid waste leachate: Application to soils from France and Togo
2020
Baccot, Camille | Pallier, Virginie | Thom, Maglwa Tcha | Thuret-Benoist, Hélène | Feuillade-Cathalifaud, Geneviève
Hydrophobic like (HPO*) and transphilic like (TPH*) fractions of organic matter (OM) were extracted from municipal solid waste leachate (MSWL) to assess their opportunity of valorization as organic amendments. Two soils with different carbon organic (Cₒᵣg) content were studied: a soil from Togo (Cₒᵣg = 0.3% in top horizon) and a soil from France (Cₒᵣg = 4.2% in top horizon). HPO* and TPH* fractions were characterized by combining elemental analysis, determination of specific ultra-violet absorbance (SUVA) index and distribution of apparent molecular weight (AMW). Comparison to natural organic matter (NOM) fractions from surface water confirmed high similarities in composition except a lower oxygen percentage explained by the different genesis processes. HPO* and TPH* adsorption tests were conducted under batch experiments on each horizon of both soils to evaluate the impact of OM fractions on the physico-chemical characteristics of soils, to determine the carbon adsorption and to calculate their adsorption capacity. Whatever the soil, Cₒᵣg adsorption did not correlate with clay content but rather with initial Cₒᵣg content in the horizon. HPO* fraction was better adsorbed than TPH* fraction. Besides, while Cₒᵣg adsorption percentages on each horizon of soils were higher for French soil, the adsorption capacities, explained as the ratio of organic carbon mass adsorbed on soils on its initial carbon mass, were 2 to 10 times higher for soil from Togo.
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