journal
MENU ▼
Read by QxMD icon Read
search

Journal of Contaminant Hydrology

journal
https://www.readbyqxmd.com/read/28495233/sorption-and-speciation-of-iodine-in-groundwater-system-the-roles-of-organic-matter-and-organic-mineral-complexes
#1
Junxia Li, Hailing Zhou, Yanxin Wang, Xianjun Xie, Kun Qian
Characterizing the properties of main host of iodine in soil/sediment and the geochemical behaviors of iodine species are critical to understand the mechanisms of iodine mobilization in groundwater systems. Four surface soil and six subsurface sediment samples were collected from the iodine-affected area of Datong basin in northern China to conduct batch experiments and to evaluate the effects of NOM and/or organic-mineral complexes on iodide/iodate geochemical behaviors. The results showed that both iodine contents and kf-iodate values had positive correlations with solid TOC contents, implying the potential host of NOM for iodine in soil/sediment samples...
April 24, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28528771/comparison-of-residual-napl-source-removal-techniques-in-3d-metric-scale-experiments
#2
O Atteia, F Jousse, G Cohen, P Höhener
This study compared four treatment techniques for the removal of a toluene/n-decane as NAPL (Non Aqueous Phase Liquid) phase mixture in identical 1 cubic meter tanks filled with different kind of sand. These four treatment techniques were: oxidation with persulfate, surfactant washing with Tween80®, sparging with air followed by ozone, and thermal treatment at 80°C. The sources were made with three lenses of 26×26×6.5cm, one having a hydraulic conductivity similar to the whole tank and the two others a value 10 times smaller...
April 21, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28434529/stochastic-multicomponent-reactive-transport-analysis-of-low-quality-drainage-release-from-waste-rock-piles-controls-of-the-spatial-distribution-of-acid-generating-and-neutralizing-minerals
#3
Daniele Pedretti, K Ulrich Mayer, Roger D Beckie
In mining environmental applications, it is important to assess water quality from waste rock piles (WRPs) and estimate the likelihood of acid rock drainage (ARD) over time. The mineralogical heterogeneity of WRPs is a source of uncertainty in this assessment, undermining the reliability of traditional bulk indicators used in the industry. We focused in this work on the bulk neutralizing potential ratio (NPR), which is defined as the ratio of the content of non-acid-generating minerals (typically reactive carbonates such as calcite) to the content of potentially acid-generating minerals (typically sulfides such as pyrite)...
April 12, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28442237/long-term-ert-monitoring-of-biogeochemical-changes-of-an-aged-hydrocarbon-contamination
#4
David Caterina, Adrian Flores Orozco, Frédéric Nguyen
Adequate management of contaminated sites requires information with improved spatio-temporal resolution, in particular to assess bio-geochemical processes, such as the transformation and degradation of contaminants, precipitation of minerals or changes in groundwater geochemistry occurring during and after remediation procedures. Electrical Resistivity Tomography (ERT), a geophysical method sensitive to pore-fluid and pore-geometry properties, permits to gain quasi-continuous information about subsurface properties in real-time and has been consequently widely used for the characterization of hydrocarbon-impacted sediments...
April 10, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28479186/dissolution-enhancement-and-mathematical-modeling-of-removal-of-residual-trichloroethene-in-sands-by-ozonation-during-flushing-with-micro-nano-bubble-solution
#5
Menghau Sung, Chun-Hao Teng, Tsung-Hsien Yang
Soil flushing using micro-nano-sized bubbles (MNB) in water as the flushing solution was tested in laboratory sand columns for the cleanup of residual trichloroethene (TCE) non-aqueous-phase-liquid (NAPL). Experiments considering flushing with MNB as well as ozone MNB (OZMNB) in water to treat soils contaminated with residual TCE liquid were conducted to examine effects of ozone on dissolution enhancement. The degrees of residual TCE saturation in soils, ranging from 0.44% to 7.6%, were tested. During flushings, aqueous TCE concentrations at the column exit were monitored and TCE masses remained in the columns after flushing were determined...
April 6, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28433208/elucidating-the-fate-of-a-mixed-toluene-dhm-methanol-and-i-propanol-plume-during-in-situ-bioremediation
#6
E Verardo, O Atteia, H Prommer
Organic pollutants such as solvents or petroleum products are widespread contaminants in soil and groundwater systems. In-situ bioremediation is a commonly used remediation technology to clean up the subsurface to eliminate the risks of toxic substances to reach potential receptors in surface waters or drinking water wells. This study discusses the development of a subsurface model to analyse the performance of an actively operating field-scale enhanced bioremediation scheme. The study site was affected by a mixed toluene, dihydromyrcenol (DHM), methanol, and i-propanol plume...
April 6, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28442238/the-influence-of-small-scale-interlayer-heterogeneity-on-ddt-removal-efficiency-for-flushing-technology
#7
Xingwei Wang, Jiajun Chen
With an aim to investigate the influence of small-scale interlayer heterogeneity on DDT removal efficiency, batch test including surfactant-stabilized foam flushing and solution flushing were carried out. Two man-made heterogeneous patterns consisting of coarse and fine quartz sand were designed to reveal the influencing mechanism. Moreover, the removal mechanism and the corresponding contribution by foam flushing were quantitatively studied. Compared with surfactant solution flushing, the DDT removal efficiency by surfactant-stabilized foam flushing increased by 9...
April 5, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28341384/field-demonstration-of-polymer-amended-in-situ-chemical-oxidation-pa-isco
#8
Jeff A K Silva, Michelle Crimi, Thomas Palaia, Saebom Ko, Sean Davenport
The methods and results of the first field-scale demonstration of polymer-amended in situ chemical oxidation (PA-ISCO) are presented. The demonstration took place at MCB CAMLEJ (Marine Corps Base, Camp Lejeune) Operable Unit (OU) 15, Site 88, in Camp Lejeune, North Carolina between October and December 2010. PA-ISCO was developed as an alternative treatment approach that utilizes viscosity-modified fluids to improve the in situ delivery and distribution (i.e. sweep-efficiency) of chemical oxidants within texturally heterogeneous contaminated aquifers...
March 14, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28342549/stream-aquifer-and-in-stream-processes-affecting-nitrogen-along-a-major-river-and-contributing-tributary
#9
Alexander Huizenga, Ryan T Bailey, Timothy K Gates
This study assesses the spatio-temporal patterns of water and nutrient mass exchange in a stream-riparian system of a major river and a contributing tributary in an irrigated semi-arid region. Field monitoring is performed along reaches of the Arkansas River (4.7km) and Timpas Creek (2.0km) in southeastern Colorado during the 2014 growing season, with water quantity and water quality data collected using a network of in-stream sampling sites and groundwater monitoring wells. Mass balance approaches were used to identify temporal and spatial trends in flow, nitrogen (N), and salinity in stream-aquifer exchange...
March 8, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28285171/batch-soil-adsorption-and-column-transport-studies-of-2-4-dinitroanisole-dnan-in-soils
#10
Jennifer D Arthur, Noah W Mark, Susan Taylor, J Šimunek, M L Brusseau, Katerina M Dontsova
The explosive 2,4,6-trinitrotoluene (TNT) is currently a main ingredient in munitions; however the compound has failed to meet the new sensitivity requirements. The replacement compound being tested is 2,4-dinitroanisole (DNAN). DNAN is less sensitive to shock, high temperatures, and has good detonation characteristics. However, DNAN is more soluble than TNT, which can influence transport and fate behavior and thus bioavailability and human exposure potential. The objective of this study was to investigate the environmental fate and transport of DNAN in soil, with specific focus on sorption processes...
March 1, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28412014/continuum-based-dfn-consistent-numerical-framework-for-the-simulation-of-oxygen-infiltration-into-fractured-crystalline-rocks
#11
Paolo Trinchero, Ignasi Puigdomenech, Jorge Molinero, Hedieh Ebrahimi, Björn Gylling, Urban Svensson, Dirk Bosbach, Guido Deissmann
We present an enhanced continuum-based approach for the modelling of groundwater flow coupled with reactive transport in crystalline fractured rocks. In the proposed formulation, flow, transport and geochemical parameters are represented onto a numerical grid using Discrete Fracture Network (DFN) derived parameters. The geochemical reactions are further constrained by field observations of mineral distribution. To illustrate how the approach can be used to include physical and geochemical complexities into reactive transport calculations, we have analysed the potential ingress of oxygenated glacial-meltwater in a heterogeneous fractured rock using the Forsmark site (Sweden) as an example...
May 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28390700/effects-of-crude-oil-on-water-and-tracer-movement-in-the-unsaturated-and-saturated-zones
#12
Geoffrey N Delin, William N Herkelrath
A tracer test was conducted to aid in the investigation of water movement and solute transport at a crude-oil spill site near Bemidji, Minnesota. Time of travel was measured using breakthrough curves for rhodamine WT and bromide tracers moving from the soil surface through oil-contaminated and oil-free unsaturated zones to the saturated zone. Results indicate that the rates of tracer movement were similar in the oil-free unsaturated and saturated zones compared to the oily zones. These results are somewhat surprising given the oil contamination in the unsaturated and saturated zones...
May 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28372853/parameterizing-sorption-isotherms-using-a-hybrid-global-local-fitting-procedure
#13
L Shawn Matott, Anshuman Singh, Alan J Rabideau
Predictive modeling of the transport and remediation of groundwater contaminants requires an accurate description of the sorption process, which is usually provided by fitting an isotherm model to site-specific laboratory data. Commonly used calibration procedures, listed in order of increasing sophistication, include: trial-and-error, linearization, non-linear regression, global search, and hybrid global-local search. Given the considerable variability in fitting procedures applied in published isotherm studies, we investigated the importance of algorithm selection through a series of numerical experiments involving 13 previously published sorption datasets...
May 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28366612/upscaling-of-nanoparticle-transport-in-porous-media-under-unfavorable-conditions-pore-scale-to-darcy-scale
#14
N Seetha, Amir Raoof, M S Mohan Kumar, S Majid Hassanizadeh
Transport and deposition of nanoparticles in porous media is a multi-scale problem governed by several pore-scale processes, and hence, it is critical to link the processes at pore scale to the Darcy-scale behavior. In this study, using pore network modeling, we develop correlation equations for deposition rate coefficients for nanoparticle transport under unfavorable conditions at the Darcy scale based on pore-scale mechanisms. The upscaling tool is a multi-directional pore-network model consisting of an interconnected network of pores with variable connectivities...
May 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28366611/oscillatory-hydraulic-testing-as-a-strategy-for-napl-source-zone-monitoring-laboratory-experiments
#15
YaoQuan Zhou, Michael Cardiff
Non-aqueous phase liquids (NAPLs) have a complex mode of transport in heterogeneous aquifers, which can result in pools and lenses of NAPLs (the "source zone") that are difficult to detect and can cause long-term contamination via slow dissolution into groundwater (the "dissolved plume"). Characterizing the extent and evolution of NAPL contamination within the source zone is a useful strategy for designing and adapting appropriate remedial actions at many contaminated sites. As a NAPL flows into a given aquifer volume, the effective hydraulic conductivity (K) and specific storage (Ss) of the volume changes associated with the viscosity and compressibility of the impinging fluid, meaning that NAPL movement may be detectable with hydraulic testing...
May 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28363342/chance-constrained-multi-objective-optimization-of-groundwater-remediation-design-at-dnapls-contaminated-sites-using-a-multi-algorithm-genetically-adaptive-method
#16
Qi Ouyang, Wenxi Lu, Zeyu Hou, Yu Zhang, Shuai Li, Jiannan Luo
In this paper, a multi-algorithm genetically adaptive multi-objective (AMALGAM) method is proposed as a multi-objective optimization solver. It was implemented in the multi-objective optimization of a groundwater remediation design at sites contaminated by dense non-aqueous phase liquids. In this study, there were two objectives: minimization of the total remediation cost, and minimization of the remediation time. A non-dominated sorting genetic algorithm II (NSGA-II) was adopted to compare with the proposed method...
May 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28342548/in-situ-reactive-zone-with-modified-mg-oh-2-for-remediation-of-heavy-metal-polluted-groundwater-immobilization-and-interaction-of-cr-iii-pb-ii-and-cd-ii
#17
Jun Dong, Bowen Li, Qiburi Bao
Mg(OH)2 dissolves slowly and can provide a long-term source of alkalinity, thus a promising alternative reagent for the in situ remediation of heavy metal polluted groundwater. However, the application of Mg(OH)2 on in situ reactive zone (IRZ) for heavy metal polluted groundwater has never been investigated. In this study, the behaviors of heavy metals in a Mg(OH)2 IRZ were monitored for 45d. The heavy metals show a sequential precipitation by modified Mg(OH)2 due to the difference of Ksp. Column tests were conducted to investigate the temporal and spatial distribution of heavy metals in Mg(OH)2 IRZ and evaluate the stabilization effect for multi-heavy metal polluted groundwater...
February 24, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28262572/evaluation-of-multiple-tracer-methods-to-estimate-low-groundwater-flow-velocities
#18
Paul W Reimus, Bill W Arnold
Four different tracer methods were used to estimate groundwater flow velocity at a multiple-well site in the saturated alluvium south of Yucca Mountain, Nevada: (1) two single-well tracer tests with different rest or "shut-in" periods, (2) a cross-hole tracer test with an extended flow interruption, (3) a comparison of two tracer decay curves in an injection borehole with and without pumping of a downgradient well, and (4) a natural-gradient tracer test. Such tracer methods are potentially very useful for estimating groundwater velocities when hydraulic gradients are flat (and hence uncertain) and also when water level and hydraulic conductivity data are sparse, both of which were the case at this test location...
February 20, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28214619/transition-from-non-fickian-to-fickian-longitudinal-transport-through-3-d-rough-fractures-scale-in-sensitivity-and-roughness-dependence
#19
Lichun Wang, M Bayani Cardenas
Understanding transport in rough fractures from non-Fickian to Fickian regimes and the prediction of non-Fickian transport is critical for the development of new transport theories and many practical applications. Through computational experiments that fall within the macrodispersion regime, we first simulated and analyzed solute transport through synthetic rough fractures with stationary geometrical properties (i.e., fracture roughness σb/〈b〉 and correlation length λ, where b refers to aperture with its standard deviation σb and arithmetic mean 〈b〉) across increasing fracture longitudinal transport domain length L, with L/λ ranging from 2...
February 4, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28202180/chemical-structure-influence-on-napl-mixture-nonideality-evolution-rate-limited-dissolution-and-contaminant-mass-flux
#20
Mark C Padgett, Geoffrey R Tick, Kenneth C Carroll, William R Burke
The influence of chemical structure on NAPL mixture nonideality evolution, rate-limited dissolution, and contaminant mass flux was examined. The variability of measured and UNIFAC modeled NAPL activity coefficients as a function of mole fraction was compared for two NAPL mixtures containing structurally-different contaminants of concern including toluene (TOL) or trichloroethene (TCE) within a hexadecane (HEXDEC) matrix. The results showed that dissolution from the NAPL mixtures transitioned from ideality for mole fractions >0...
February 3, 2017: Journal of Contaminant Hydrology
journal
journal
29832
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"