title: A Modified Approach for in Situ Chemical Oxidation Coupled to Biodegradation Enhances Light Nonaqueous Phase Liquid Source-Zone Remediation.
abstract: Field and batch experiments were conducted to assess whether a modified approach for in situ chemical oxidation (ISCO) (with MgO2and Fe2O3particles recovered from acid mine drainage treatment) can enhance LNAPL (light nonaqueous phase liquid) dissolution and produce bioavailable soluble compounds. This modified ISCO approach was coupled to biodegradation to further remove residual compounds by microbially mediated processes. Pure palm biodiesel (B100) was chosen to represent a poorly water-soluble compound that behaves like LNAPLs, and 100 L was released to a 2 m2area excavated down to the water table. A past adjacent B100-field experiment under natural attenuation was conducted as a baseline control. Results demonstrated the enhancement of organic compound dissolution and production of soluble compounds due to the modified in situ chemical oxidation. The slow release of H2O2by MgO2decomposition (termed partial chemical oxidation) and production of soluble compounds allowed the stimulation of microbial growth and promoted a beneficial response in microbial communities involved in oxidized biodiesel compound biodegradation. This is the first field experiment to demonstrate that this modified ISCO approach coupled to biodegradation could be a feasible strategy for the removal of poorly water-soluble compounds (e.g., biodiesel) and prevent the long-term effects generally posed in source zones.
authors.affiliation: Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina , Florianópolis, Santa Catarina, Brazil.
authors.forename: Franciele
authors.initials: F
authors.lastname: Fedrizzi
authors.affiliation: Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina , Florianópolis, Santa Catarina, Brazil.
authors.forename: Débora T
authors.initials: DT
authors.lastname: Ramos
authors.affiliation: Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina , Florianópolis, Santa Catarina, Brazil.
authors.forename: Helen S C
authors.identifier: 0000-0001-6085-193X
authors.initials: HS
authors.lastname: Lazzarin
authors.affiliation: Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina , Florianópolis, Santa Catarina, Brazil.
authors.forename: Marilda
authors.initials: M
authors.lastname: Fernandes
authors.affiliation: Environmental Microbial Genomics, Laboratoire Ampere, CNRS, École Centrale de Lyon, Université de Lyon , Ecully, France.
authors.forename: Catherine
authors.initials: C
authors.lastname: Larose
authors.affiliation: Environmental Microbial Genomics, Laboratoire Ampere, CNRS, École Centrale de Lyon, Université de Lyon , Ecully, France.
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Vogel
authors.affiliation: Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina , Florianópolis, Santa Catarina, Brazil.
authors.forename: Henry X
authors.initials: HX
authors.lastname: Corseuil
mesh_terms: D001673:Biodegradation, Environmental; D005290:Ferric Compounds; D060587:Groundwater; D006861:Hydrogen Peroxide; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide