RT Journal Article
T1 Abatement of chlorinated compounds in groundwater contaminated by HCH wastes using ISCO with alkali activated persulfate
A1 Santos López, Aurora
A1 Jesús Fernández, 
A1 Rodríguez Vega, Sergio
A1 Domínguez Torre, Carmen María
A1 Miguel Ángel Lominchar, 
A1 Lorenzo Fernández, David
A1 Romero Salvador, Arturo
AB 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.
PB Elsevier
SN 0048-9697
YR 2018
FD 2018-02-18
LK https://hdl.handle.net/20.500.14352/99907
UL https://hdl.handle.net/20.500.14352/99907
LA eng
NO Comunidad Autónoma de Madrid
NO Spanish Ministry of Economy, Industry and Competitiveness
DS Docta Complutense
RD 11 ago 2024