The Construction Products Directive (CPD) will in 2013 be replaced by the Construction Products R... more The Construction Products Directive (CPD) will in 2013 be replaced by the Construction Products Regulation (CPR), which extends into recycling and end of life aspects. The development of appropriate standards has been taken up by CEN/TC 351, where a horizontal approach to testing is promoted to avoid multiplication of test protocols per sector. In parallel, IPTS-JRC is developing criteria for End of Waste (EoW). Redundant testing shall be avoided. Dossiers are being drafted to allow declaration of “without further testing” (WFT) for products as a whole, or for specific regulated substances potentially released from products. These dossiers call for information and test data on the wide variety of products covered by harmonised European standards. Experience has been gained with a range of products over the past decade. This information has been compiled in LeachXSTM Lite, which has been developed with support of US EPA for use in combination with the new EPA leaching test methods (s...
A field pilot demonstration integrating pneumatic fracturing and in situ bioremediation was carri... more A field pilot demonstration integrating pneumatic fracturing and in situ bioremediation was carried out in a gasoline-contaminated, low permeability soil formation. A pneumatic fracturing system was used to enhance subsurface air flow and transport rates, as well as ...
This study considers desorption kinetics for 12 field-aged polycyclic aromatic hydrocarbons (PAHs... more This study considers desorption kinetics for 12 field-aged polycyclic aromatic hydrocarbons (PAHs) desorbing from size- and density-fractionated sediments collected from two locations in the New York/New Jersey Harbor Estuary. Desorption kinetics for PAHs with a log octanol-water partition coefficient greater than 6 were well-described by a one-domain diffusion model that assumes that PAHs are initially uniformly distributed throughout spherical sediment aggregates. PAH hydrophobicity and sediment specific surface area were the parameters most strongly correlated with the magnitude of the observed diffusivity for the one-domain model. For less hydrophobic PAHs, a two-domain desorption model was used also, and the results suggest that a substantial fraction of these field-aged PAHs desorb via a relatively fast macro-mesopore diffusion mechanism. The model-predicted fraction of PAHs in the fast-diffusion regime by compound and sediment was highly correlated with the measured percent PAH desorption in 24 h. The fast-domain diffusivity was 100 times greater than the slow-domain diffusivity, was correlated with both PAH properties and sediment physical and chemical properties, and could be estimated by readily obtainable physical and chemical parameters. In contrast, the slow-domain diffusivity was not significantly correlated with PAH properties. Our results suggest that macro-mesopore diffusion may control mass transport of less-hydrophobic PAHs in estuarine sediments.
Page 1. HAZARDOUS WASTE & HAZARDOUS MATERIALS Volume 4, Number 3, 1987 Mary Ann Liebert, ... more Page 1. HAZARDOUS WASTE & HAZARDOUS MATERIALS Volume 4, Number 3, 1987 Mary Ann Liebert, Inc., Publishers Degradation of 1,1,1-Trichloroethane in Bench-Scale Bioreactors JEAN D. BOYER, ROBERT C. AHLERT, and DAVID S. KOSSON ...
The Construction Products Directive (CPD) will in 2013 be replaced by the Construction Products R... more The Construction Products Directive (CPD) will in 2013 be replaced by the Construction Products Regulation (CPR), which extends into recycling and end of life aspects. The development of appropriate standards has been taken up by CEN/TC 351, where a horizontal approach to testing is promoted to avoid multiplication of test protocols per sector. In parallel, IPTS-JRC is developing criteria for End of Waste (EoW). Redundant testing shall be avoided. Dossiers are being drafted to allow declaration of “without further testing” (WFT) for products as a whole, or for specific regulated substances potentially released from products. These dossiers call for information and test data on the wide variety of products covered by harmonised European standards. Experience has been gained with a range of products over the past decade. This information has been compiled in LeachXSTM Lite, which has been developed with support of US EPA for use in combination with the new EPA leaching test methods (s...
A field pilot demonstration integrating pneumatic fracturing and in situ bioremediation was carri... more A field pilot demonstration integrating pneumatic fracturing and in situ bioremediation was carried out in a gasoline-contaminated, low permeability soil formation. A pneumatic fracturing system was used to enhance subsurface air flow and transport rates, as well as ...
This study considers desorption kinetics for 12 field-aged polycyclic aromatic hydrocarbons (PAHs... more This study considers desorption kinetics for 12 field-aged polycyclic aromatic hydrocarbons (PAHs) desorbing from size- and density-fractionated sediments collected from two locations in the New York/New Jersey Harbor Estuary. Desorption kinetics for PAHs with a log octanol-water partition coefficient greater than 6 were well-described by a one-domain diffusion model that assumes that PAHs are initially uniformly distributed throughout spherical sediment aggregates. PAH hydrophobicity and sediment specific surface area were the parameters most strongly correlated with the magnitude of the observed diffusivity for the one-domain model. For less hydrophobic PAHs, a two-domain desorption model was used also, and the results suggest that a substantial fraction of these field-aged PAHs desorb via a relatively fast macro-mesopore diffusion mechanism. The model-predicted fraction of PAHs in the fast-diffusion regime by compound and sediment was highly correlated with the measured percent PAH desorption in 24 h. The fast-domain diffusivity was 100 times greater than the slow-domain diffusivity, was correlated with both PAH properties and sediment physical and chemical properties, and could be estimated by readily obtainable physical and chemical parameters. In contrast, the slow-domain diffusivity was not significantly correlated with PAH properties. Our results suggest that macro-mesopore diffusion may control mass transport of less-hydrophobic PAHs in estuarine sediments.
Page 1. HAZARDOUS WASTE & HAZARDOUS MATERIALS Volume 4, Number 3, 1987 Mary Ann Liebert, ... more Page 1. HAZARDOUS WASTE & HAZARDOUS MATERIALS Volume 4, Number 3, 1987 Mary Ann Liebert, Inc., Publishers Degradation of 1,1,1-Trichloroethane in Bench-Scale Bioreactors JEAN D. BOYER, ROBERT C. AHLERT, and DAVID S. KOSSON ...
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