期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 25, 期 35, 页码 34985-34994出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-1425-4
关键词
Organochlorine pesticides; Hexachlorocyclohexanes; Lindane; BDD; Carbon felt; Hydroxyl radical; Electrochemical oxidation
资金
- Comunidad Autonoma of Madrid [S2013-MAE-2739 CARESOIL-CM]
- Spanish MINECO [CTM2013-43794-R, CTM2016-77151-C2-1-R]
This study is focused on the effective removal of recalcitrant pollutants hexaclorocyclohexanes (HCHs, isomers alpha, beta, gamma, and ) 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 m gL(-1), pH(0) = 7, conductivity = 3.7 m Scm(-1), high salt concentration (SO42-, HCO3-, 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 m gL(-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.
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