title: Pilot-scale ISCO treatment of a MtBE contaminated site using a Fenton-like process.
abstract: This paper reports about a pilot-scale feasibility study of In-Situ Chemical Oxidation (ISCO) application based on the use of stabilized hydrogen peroxide catalyzed by naturally occurring iron minerals (Fenton-like process) to a site formerly used for fuel storage and contaminated by MtBE. The stratigraphy of the site consists of a 2-3 meter backfill layer followed by a 3-4 meter low permeability layer, that confines the main aquifer, affected by a widespread MtBE groundwater contamination with concentrations up to 4000 μg/L, also with the presence of petroleum hydrocarbons. The design of the pilot-scale treatment was based on the integration of the results obtained from experimental and numerical modeling accounting for the technological and regulatory constraints existing in the site to be remediated. In particular, lab-scale batch tests allowed the selection of the most suitable operating conditions. Then, this information was implemented in a numerical software that allowed to define the injection and monitoring layout and to predict the propagation of hydrogen peroxide in groundwater. The pilot-scale field results confirmed the effective propagation of hydrogen peroxide in nearly all the target area (around 75 m(2) using 3 injection wells). As far as the MtBE removal is concerned, the ISCO application allowed us to meet the clean-up goals in an area of 60 m(2). Besides, the concentration of TBA, i.e. a potential by-product of MtBE oxidation, was actually reduced after the ISCO treatment. The results of the pilot-scale test suggest that ISCO may be a suitable option for the remediation of the groundwater plume contaminated by MtBE, providing the background data for the design and cost-estimate of the full-scale treatment.
authors: Eni Refining & Marketing, Via Laurentina 449, 00142 Rome, Italy.
authors: Ivan
authors: I
authors: Innocenti
authors: Laboratory of Environmental Engineering, Department of Civil Engineering and Computer Science Engineering, University of Rome "Tor Vergata", Via del Politecnico, 1, 00133 Rome, Italy.
authors: Iason
authors: I
authors: Verginelli
authors: Eni Refining & Marketing, Via Laurentina 449, 00142 Rome, Italy.
authors: Felicia
authors: F
authors: Massetti
authors: Laboratory of Environmental Engineering, Department of Civil Engineering and Computer Science Engineering, University of Rome "Tor Vergata", Via del Politecnico, 1, 00133 Rome, Italy.
authors: Daniela
authors: D
authors: Piscitelli
authors: Laboratory of Environmental Engineering, Department of Civil Engineering and Computer Science Engineering, University of Rome "Tor Vergata", Via del Politecnico, 1, 00133 Rome, Italy.
authors: Renato
authors: R
authors: Gavasci
authors: Laboratory of Environmental Engineering, Department of Civil Engineering and Computer Science Engineering, University of Rome "Tor Vergata", Via del Politecnico, 1, 00133 Rome, Italy. Electronic address: baciocchi@ing.uniroma2.it.
authors: Renato
authors: R
authors: Baciocchi
mesh_terms: D052918:Environmental Restoration and Remediation / Q000379:methods*; D060587:Groundwater / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008738:Methyl Ethers / Q000032:analysis / Q000737:chemistry*; D008956:Models, Chemical; D010865:Pilot Projects; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: C045076:Fenton's reagent; D008738:Methyl Ethers; D014874:Water Pollutants, Chemical; C043243:methyl tert-butyl ether; D006861:Hydrogen Peroxide; D007501:Iron
keywords: Groundwater contamination; Hydrogen peroxide; In-Situ Chemical Oxidation; MtBE; Pilot test