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00925njm 22002777a 4500 dc Santos López, Aurora author Fernández, Jesús author Rodríguez Vega, Sergio author Domínguez Torre, Carmen María author Lominchar, Miguel Ángel author Lorenzo Fernández, David author Romero Salvador, Arturo author 2018 In this work, in situ chemical oxidation (ISCO) with alkali activated persulfate has been tested for the elimination of HCH isomers and other chlorinated compounds in groundwater from Sabiñanigo (Sardas landfill), which was contaminated by solid and liquid wastes illegally dumped in the area by a company producing lindane. Due to the site lithology and the type of pollutants found in groundwater (HCHs and chlorobenzenes) alkali (NaOH) activated persulfate (PS) was selected as oxidant. The influence of variables such as PS concentration (42–200 mM) and NaOH:PS molar ratio (2:1 to 4:1) on chlorinated compound abatement has been studied and a kinetic model to predict the composition of all chlorinated organic compounds (COCs) in the aqueous phase with time was obtained. It was found that a fast initial hydrodechlorination reaction took place in which HCH isomers reacted to trichlorobenzenes (mainly 1,2,4 TCB) at pH ≥ 12. Mono-, di-, tri and tetrachlorobenzenes remaining were oxidized without producing aromatic intermediates. At the condition tested a first order kinetic model for COCs and PS concentration was obtained. Zero order alkali concentration was obtained while pH was being kept at 12 for the whole reaction time. Santos, A., et al. «Abatement of Chlorinated Compounds in Groundwater Contaminated by HCH Wastes Using ISCO with Alkali Activated Persulfate». Science of The Total Environment, vol. 615, febrero de 2018, pp. 1070-77. https://doi.org/10.1016/j.scitotenv.2017.09.224. 0048-9697 10.1016/j.scitotenv.2017.09.224 https://hdl.handle.net/20.500.14352/99907 https://doi.org/10.1016/j.scitotenv.2017.09.224. Abatement of chlorinated compounds in groundwater contaminated by HCH wastes using ISCO with alkali activated persulfate