2026-06-07T23:49:03Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/924222025-03-18T14:45:58Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author García Cervilla, Raúl author Santos López, Aurora author Romero Salvador, Arturo author Lorenzo Fernández, David 2024-01-11T08:46:12Z 2024-01-11T08:46:12Z 2020 García-Cervilla, Raúl, et al. «Remediation of Soil Contaminated by Lindane Wastes Using Alkaline Activated Persulfate: Kinetic Model». Chemical Engineering Journal, vol. 393, agosto de 2020, p. 124646. https://doi.org/10.1016/j.cej.2020.124646. 1385-8947 10.1016/j.cej.2020.124646 https://hdl.handle.net/20.500.14352/92422 https://doi.org/10.1016/j.cej.2020.124646 In this work, remediation of a soil highly polluted with chlorinated organic compounds (COCs), including chlorobenzenes, hexachlorocyclohexane (HCH) and heptachlorocyclohexane (HeptaCH), has been carried out using persulfate (PS) activated by alkali (NaOH). The contamination was caused by wastes from lindane production. Soil samples were sieved in two fractions: F (dp < 0.25 mm) and G (2 mm < dp < 0.25 mm), and both were used to study the influence of the oxidant and activator concentrations (CPS = 100–400 mmolL−1, CNaOH =100–200molL−1) on COC abatement. The alkali causes rapid dehydrochlorination of HCHs and HeptaCHs to Trichlorobenzenes (TCBs) and Tetrachlorobenzenes (TetraCBs), respectively. A COC conversion of about 96% and 70% was obtained at 21 days in fractions G and F, respectively, when using PS and NaOH concentrations of 400 mmolL−1. The discriminated kinetic model reveals that the oxidation reaction takes place in both the soil and aqueous phases. This explains in detail the TCB and TetraCB concentration change seen in both phases with the reaction time, at the oxidant and activator concentration range studied, for the two soil particle sizes and contamination levels used. Reaction order for NaOH concentration was zero if pH was above 12. The reaction order for PS was 1.0 for the oxidation rate in the aqueous phase and lower than 1.0 for the oxidation rate in the soil phase, which is lower in the soil fraction with smaller particles. Moreover, while equilibrium between phases was not achieved, the model takes into account the mass transfer of COCs from the soil to the aqueous phase eng Remediation of soil contaminated by lindane wastes using alkaline activated persulfate: Kinetic model journal article 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URL https://docta.ucm.es/bitstreams/723800dd-1505-46fc-9de4-d5e536c8f948/download File MD5 3fe95f8fba278e6a4ba2046690452f28 1411697 application/pdf Remediation_of_soil.pdf URL https://docta.ucm.es/bitstreams/cd7e8a81-39af-447b-a265-0d0779f4da21/download File MD5 ede2e8c0dcc613ff3f30f4ee27168cae 71221 text/plain Remediation_of_soil.pdf.txt