Details

Autor(en) / Beteiligte

• Dominguez, Carmen M.
• Oturan, Nihal
• Romero, Arturo
• Santos, Aurora
• Oturan, Mehmet A.

Titel

Removal of organochlorine pesticides from lindane production wastes by electrochemical oxidation

Ist Teil von

• Environmental science and pollution research international, 2018-12, Vol.25 (35), p.34985-34994

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2018

Quelle

MEDLINE

Beschreibungen/Notizen

• This study is focused on the effective removal of recalcitrant pollutants hexaclorocyclohexanes (HCHs, isomers α, β, γ, and δ) and chlorobenzenes (CBs) present in a real groundwater coming from a landfill of an old lindane factory. Groundwater is characterized by a total organic carbon (TOC) content of 9 mg L −1 , pH 0  = 7, conductivity = 3.7 mS cm −1 , high salt concentration (SO 4 2− , HCO 3 − , Cl − ), and ferrous iron in solution. The experiments were performed using a BDD anode and a carbon felt (CF) cathode at the natural groundwater pH and without addition of supporting electrolyte. The complete depletion of the four HCH isomers and a mineralization degree of 90% were reached at 4-h electrolysis with a current intensity of 400 mA, the residual TOC (0.8 mg L −1 ) corresponding mainly to formic acid. A parallel series reaction pathway was proposed: HCHs and CBs are transformed into chlorinated and hydroxylated intermediates that are rapidly oxidized to non-toxic carboxylic acids and/or mineralized, leading to a rapid decrease in solution pH.