Showing papers in "Journal of Contaminant Hydrology in 2000"

TL;DR: Permeable reactive barriers are an emerging alternative to traditional pump and treat systems for groundwater remediation as discussed by the authors, which has progressed rapidly from laboratory bench-scale studies to full-scale implementation.

TL;DR: A review of the principles behind the different approaches, summarizes methods used and evaluates the approaches based on the experience from the reported applications can be found in this paper, with a few exceptions, direct electrochemical measurement and rigorous interpretation of redox potentials dubious, if not erroneous.

TL;DR: In this paper, a three-site cation exchange model is proposed to describe the concentration dependent uptake of Cs on natural argillaceous rock systems, and the model is tested on four Cs sorption isotherm data sets determined on argilaceous rocks: Boom clay, Oxford clay, Palfris marl and Opalinus clay.

TL;DR: In this article, a multi-dimensional and multi-species reactive transport model was developed to aid in the analysis of natural attenuation design at chlorinated solvent sites, which can simulate several simultaneously occurring attenuation processes including aerobic and anaerobic biological degradation processes.

TL;DR: The Nickel Rim mine tailings were deposited in an elevated impoundment at the nickel-rim mine, an abandoned Ni-Cu mine near Sudbury, Ontario from 1953 to 1958.

TL;DR: In this article, column flow experiments were conducted in Ottawa sand under both saturated and unsaturated flow conditions using two bacteriophages, MS2 and φX174, and the results from elution experiments using beef extract solution revealed that the increased removal of MS2 in the Ottawa sand appeared to be caused by increased sorption whereas the increased removing of MS 2 was due to inactivation.

TL;DR: In this article, a review of methods for using geophysical and hydrological data to estimate hydraulic parameters and their spatial correlation structures is presented, which can be used to aid numerical aquifer model construction, calibration, and flow simulation.

TL;DR: In this article, a down-dip decrease in the 34 S content of groundwater sulphate over the unconfined and shallow confined areas of the aquifer is indicative of a progressive increase in the significance of pyrite-derived sulphate in the system.

TL;DR: In this article, the effect of sorption on degradation of 2,4-dichlorophenoxyacetic acid was studied in a soil amended with various amounts of activated carbon (AC).

TL;DR: In this paper, the influence of pore-scale dispersion on concentration statistical moments in transport through heterogeneous aquifers is investigated in a Lagrangean framework, continuous limit of the particle tracking procedure, by adopting a few approximations.

TL;DR: In this article, the uptake of 5×10 −4 mol/l solutions of Cd, Pb and Zn by a fluvio glacial deposit with high carbonate content (227 mg/g) was studied in column and batch experiments.

TL;DR: In this paper, a two-region nonequilibrium model was used to calibrate initial solute-transport parameter estimates generated from tracer-breakthrough curves (TBCs) developed by tracer tests conducted in uni-axial solution conduits in karstic aquifers.

TL;DR: In this paper, the authors examined the use of six flushing agents, i.e., two anionic surfactants, two complexing agents (cyclodextrins), a humic acid, and an alcohol, for solubilizing and removing residual-phase immiscible liquid from porous media.

TL;DR: In this paper, a 15 m×15 m field plots, a Te Awa silt loam and a Twyford fine sandy loam, located in Hawkes Bay, New Zealand, were applied with bromide, picloram, atrazine, and simazine.

TL;DR: In this paper, the removal of bacteriophages MS2 and PRD1, spores of Clostridium bifermentans R5 and Escherichia coli WR1 by deep well injection into a sandy aquifer, was studied at a pilot field site in the southeast of the Netherlands.

TL;DR: The results of a laboratory study dealing with macropore continuity effects on breakthrough curves (BTCs) and solute distribution in a Forman loam (fine-loamy mixed Udic Haploborolls) soil were obtained under a constant hydraulic head of 0.08 m from a 2-dimensional column (slab) containing artificial macropores.

TL;DR: In this article, the effectiveness of various electron donors (acetate, hydrogen gas, elemental sulphur, thiosulphate, aqueous ferrous iron and pyrite) at stimulating denitrification was compared in microcosm experiments involving sediment from the Baden aquifer.

TL;DR: In this paper, the authors modelled lithium transport through an undisturbed solid waste sample and a pilot-scale experimental landfill by use of the same probabilistic Lagrangian approach.

TL;DR: In this paper, the active layer of pyritic mine tailings at Nanisivik Mine, located in a permafrost area on Baffin Island in northern Canada, was investigated.

TL;DR: In this paper, a 2D numerical model incorporating vapour-phase diffusion, advection, sorption and biodegradation was used to simulate the effect of a building floor slab on transport processes.

TL;DR: In this paper, an ensemble of realizations of random, spatially correlated permeability fields are generated and employed in model simulations of a spill event, and statistical techniques are then used to quantify the sensitivity of model predictions to input parameters, identifying the parameters or processes that may be of primary importance in the determination of organic liquid distributions in heterogeneous systems.

TL;DR: In this article, the authors summarized key technical and economic issues for surfactant-enhanced remediation of contaminated soil and ground water supplies and showed how a site-specific capillary curve can be used to optimize contaminant solubility while mitigating mobilization and vertical migration.

TL;DR: In this paper, the authors assess the effect of hydrological and lithological factors on discharge of contaminated groundwater from abandoned deep coal mine discharges in the UK and demonstrate that after flooding of a deep mine is complete and groundwater begins to migrate from the mine voids into surface waters or adjoining aquifers, flushing by fresh recharge results in a gradual improvement in the quality of groundwater (principally manifested as decreasing Fe concentrations and stabilisation of pH around 7).

TL;DR: In this paper, a survey of rural groundwater quality in Canada showed that some drinking water wells were consistently contaminated with bacteria, whereas others were consistently free of such contamination, and the prediction of the most relevant factors affecting well water quality in Ontario was evaluated for different soil and geological profiles in the Goromonzi district of Zimbabwe.

TL;DR: In this paper, a field-scale natural gradient tracer experiment with bromide, uranin and lithium was conducted in a heterogeneous aquifer at Krauthausen, Germany.

TL;DR: In this article, the authors conducted dissolution experiments in a two-dimensional cell with simple heterogeneous packing consisting of well-defined coarse lenses contaminated by NAPL surrounded by a clean fine sand matrix, and sufficient experimental conditions were tested to suggest three important mechanisms affect the overall mass transfer behavior in this heterogeneous system.

TL;DR: In this paper, a plume of groundwater affected by sulfide oxidation extends 160 m downgradient from the Nickel Rim Mine tailings impoundment and discharges to a small lake.

TL;DR: In this paper, EDTA was percolated in laboratory columns through a soil polluted by heavy metals to investigate the efficiency of and processes involved in soil decontamination by chemical extraction.

TL;DR: In this paper, the authors developed a two-dimensional numerical simulator to investigate the performance of field scale SVE and BV systems by integrating processes of multiphase flow, multicomponent compositional transport with nonequilibrium interphase mass transfer, and aerobic biodegradation.

TL;DR: In this paper, the air-water interfacial area (a0) was estimated using the surfactant adsorption concept in unsaturated porous media, where a column composed of several stainless steel rings was used to carry out saturated/unsaturated experiments in three glass beads media.