aquifer Articles
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Recharge mechanism and hydrochemistry evaluation of groundwater in the Nuaimeh area, Jordan, using environmental isotope techniques
The relationship between the stable isotopic and chemical composition of precipitation and groundwater was studied in the Nuaimeh area of the Ajloun Highlands in Jordan. The isotopic composition values of precipitation and groundwater are almost identical. The spatial variation of stable isotopes in precipitation is mainly due to the effect of seasonal temperature, altitude and amount. The ...
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Assessment of groundwater vulnerability to nitrate pollution caused by agricultural practices
Environmental risk assessment is a step towards identification, analysis, and classification of risk factors and thus reduction of the possibility of adverse consequences. In this research, a novel approach for environmental risk assessment on groundwater pollution is applied. By combination of aquifer vulnerability DRASTIC map, pollution severity and prioritizing of the plain regions by the ...
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Contamination by mercury of groundwater of the North Numidian zone of Azzaba, North East Algeria. Effect of inorganic mercury contamination of population
The mercury ore deposit of Azzaba is located on the northern flank of the limestone chain, south of Azzaba town, North East Algeria. Nineteen springs and wells from the two aquifers were sampled for chemical analyses. Water of the Oligocene aquifer shows high Hg contents (up to 80 (g.L−1) whereas in the deep aquifer, Hg contents do not exceed 7 µg.L−1). School children of the Azzaba region have a ...
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Mathematical modeling for solute transport in aquifer
Groundwater pollution may occur due to human activities, industrial effluents, cemeteries, mine spoils, etc. This paper deals with one-dimensional mathematical modeling of solute transport in finite aquifers. The governing equation for solute transport by unsteady groundwater flow is solved analytically by the Laplace transform technique. Initially, the aquifer is subjected to the spatially ...
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The role of indigenous microorganisms in the biodegradation of naturally occurring petroleum, the reduction of iron, and the mobilization of arsenite from West bengal aquifer sediments
High levels of naturally occurring arsenic are found in the shallow reducing aquifers of West Bengal, Bangladesh, and other areas of Southeast Asia. These aquifers are used extensively for drinking water and irrigation by the local population. Mechanisms for its release are unclear, although increasing evidence points to a microbial control. The type of organic matter present is of vital ...
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Dr. Hargis presents at Parma conference on aquifer risk & vulnerability
On September 22, 2005, Dr. Dave Hargis presented a paper titled, 'Groundwater Degradation from Agricultural Pesticides in Volcanic Terrains – A Case History: Oahu, Hawaii.' The conference was the 2nd International Workshop on Aquifer Risk & Vulnerability held in Reggia di Colorno. The venue was 12 km outside of Parma, Italy, in the Palazzo dei Duchi, a historical fortress that served as the ...
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Application of a GIS-based DRASTIC model and groundwater quality index method for evaluation of groundwater vulnerability: a case study, Sefid-Dasht
Pollution control and removal of pollutants from groundwater are a challenging and expensive task. The aims of this paper are to determine the aquifer vulnerability of Sefid-Dasht, in Chaharmahal and Bakhtiari province, Iran, using the DRASTIC model. In addition, the groundwater quality index (GQI) technique was applied to assess the groundwater quality and study the spatial variability of ...
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Investigating and mapping spatial patterns of arsenic contamination in groundwater using regression analysis and spline interpolation technique
The present study investigates the hypothesis that arsenic concentrations correlate with tubewell depth, and examines the effectiveness of spline interpolation, specifically completely regularized spline (CRS) and spline with tension (SWT) in estimating the magnitude of arsenic contamination in groundwater in Thanh Tri, a densely populated district located in the southern part of Hanoi City, ...
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Potential impact of heterogeneity on groundwater age
Groundwater age is an important water property used as an indicator of groundwater quality. There have been no sufficient data and measurements underground, and that problem has been mitigated by using direct simulation of groundwater age. This paper has been motivated by the work of Daniel J. Goode, defining a rather different approach. A numerical model has been developed, using the ...
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ANN-based approach for the estimation of aquifer pollutant source behaviour
The problem of identifying an unknown pollution source in polluted aquifers, based on known contaminant concentration measurements, is part of the broader group of issues called inverse problems. This paper investigates the feasibility of solving the groundwater pollution inverse problem by using artificial neural networks (ANNs). The approach consists first in training an ANN to solve the ...
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Study the impact of land use and over pumping on nitrate concentration in groundwater by using modelling approach
Gaza Strip, a heavily populated area, is a narrow coastal strip on the Mediterranean Sea (360 km 2 ). Groundwater is the only source of drinking water for the majority of the population. However, many human activities greatly threaten the groundwater resources and nitrate was and still is a major groundwater pollutant. Khanyounis, one of the southern governorates of Gaza Strip, is suffering ...
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Assessment of water qualities and evidence of seawater intrusion in a deep confined aquifer: case of the coastal Djeffara aquifer (Southern Tunisia)
Geochemical analyses of groundwater samples from the Djeffara confined aquifer (Southern Tunisia) were performed. The distribution of saline waters was investigated to identify the origin of the groundwater contamination. The aquifer was shown to be affected by an abnormal increase in groundwater salinity. Near the recharge zone, the groundwater salinity does not exceed 2.5 g l−1 but ...
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Feasibility of calcium peroxide as an oxygen releasing compound in treatment walls
This research investigates the use of a proprietary formulation of calcium peroxide as an oxygen releasing compound in a treatment wall. Laboratory scale column studies evaluated the release of oxygen and the permeability effects resulting from a mixture of the calcium peroxide and a representative aquifer sand (40-mesh Unimin sand). Influent water was prepared at an average dissolved oxygen ...
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Permeable Adsorbing Barriers for groundwater remediation from hexavalent chrome pollution
Chrome ions removal from aqueous solutions by adsorption onto an activated carbon (Aquacarb 207EA by Sutcliffe Carbon) and a South African coal char is illustrated. Different chrome concentrations, pH and salinity levels are tested. Experimental data are interpreted by means of a Langmuir approach-based model. Results show that a Permeable Adsorbing Barrier (PAB) made of Aquacarb 207EA can ...
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Dynamics of nitrate & perchlorate in groundwater.
The Apache Powder Superfund Site is located in Cochise County, Arizona, approximately 50 miles southeast of Tucson. The site was listed on the National Priorities List pursuant to CERCLA in 1990. Principal groundwater chemicals of concern (COCs) include nitrate-nitrogen (nitrate-N) and perchlorate. Concentrations of nitrate-N exceeding 500 mg/l and 2,300 mg/l have been detected in the “shallow ...
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Geological barrier--a natural rock stratus for preventing confined karst water from flowing into mines in North China
Abstract Coalfields in North China encompassing more than ten Provinces contain six to seven coal seams in the Permo-Carboniferous strata. The lower three seams, accounting for 37% of the total reserves, are threatened with karst water from the underlain Ordovician limestone. Hundreds of water inrush incidences have occurred in which a large amount of water suddenly flows into tunnels or ...
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Prevent Stagnation Zones during Injection to Improve Contact Efficiency
When injecting into multiple wells simultaneously, stagnation zones can develop preventing effective reagent delivery. Figure 1 shows the simulated EOS Pro distribution in a homogeneous aquifer when EOS Pro is injected into all the wells in a biobarrier at the same time. Simultaneous injection creates gaps in the biobarrier where converging streamlines prevent effective distribution. ...
By Redox Tech
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Method for remediation of aquifers
The US Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of contract F41624-99 C-8033 awarded by the United States Air Force Material Command. BACKGROUND OF THE INVENTION 1. Field of the InventionThis invention relates to the remediation of contaminated ...
By Redox Tech
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Spatial distribution of groundwater pollution in the Porsuk River Basin (PRB), Turkey
The groundwater in the alluvium aquifer of the Eskisehir Plain (EP) is polluted by wastewaters transported through Porsuk River, agricultural-industrial activities, river-groundwater interactions and unsanitary landfill. Porsuk River flows throughout the alluvium aquifer in the EP. In this study, the effects of anthropogenic activities on groundwater quality in the EP were investigated. Since the ...
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A GIS-based methodology to delineate aquifer recharge areas
A GIS-based methodology to delineate risk areas for contamination of groundwater resources is presented by identifying recharge conditions to the aquifer. Identifying the recharge areas is based upon surface and subsurface geologic conditions that may control the risk of potential oil spill contaminants into the aquifer. This study uses the Chicot aquifer system in southwest Louisiana as a pilot ...
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