5.7 mill. Dkr from FTP to J&M for project on cleaning groundwater using engineered reactive particles - 03.08.2009
Iron hydroxide intercalates for degradation of halogenated solvents in sediment/soil and groundwater (Iron-X)
A newly discovered class of layered iron hydroxides intercalated with fatty acids (carboxylate-LIH) will be used as reactive sorbents to degrade chlorinated solvents. Soil and groundwater polluted by halogenated hydrocarbons present one of the most serious threats to drinking water resources and human health – and efficient clean-up of these sites continues as one of the major challenges in environmental remediation technology. The project comprise engineering of the LIH particles to optimise their efficiency for degradation of chloro-alkanes and -alkenes in soil and groundwater. We will quantify sorption and subsequent reduction kinetics and pathways depending on the formulation of LIH. The size selectivity of the sorbent will be controlled by pillaring of the interlayer, while an “on/off” reactivity mechanism will be attempted using silicate “switches”. The geochemical functioning of the LIH particles will be tested in i) sediment batch and column studies, and ii) in situ by pressurized geoprobe injection of LIH or LIH-oil suspensions into contaminated sediments, either in the contaminant source area and/or into the pollutant plume with subsequent monitoring of degradation products. Conceptual models based on the intrinsic sorption and reactivity properties of the LIH particles modified by the flow characteristics will be developed to describe the performance of LIH for clean-up of chlorinated solvents. The project also have perspectives for dehalogenation of brominated compounds.
1: Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, Frederiksberg, Denmark (BSE-LIFE-KU)
2: Department of Environmental Engineering, Danish Technical University, Kgs.Lyngby, Denmark (EE-DTU)
3: Department of Civil and Environmental Engineering, University of Iowa, Iowa City, Iowa (CEEUI)