Groundwater is a vital source of fresh water for drinking and agricultural purposes in the region Hatiya Island, Bangladesh, yet it subject to contamination by natural anthropogenic activities. Over time, has resulted variety negative effects on human health. This research aims examine groundwater hydrogeochemical characterization suitability irrigation different indices utilizing combined geochemical method, multivariate statistical approaches, geospatial analysis. Results analyses 15...

Linked tectonic, geochemical, and biologic processes lead to natural arsenic contamination of groundwater in Holocene alluvial aquifers, which are the main threat human health around world. These groundwaters commonly found a long distance from their ultimate source arsenic, where chemical weathering As‐bearing minerals occurs. We propose “GBH‐As” model that ties together all important biologic, hydrologic cause As release terrestrial deposits. Processes highlighted by can explain movement...

This study outlines numerical experiments to investigate the effects of hydrocarbon generation, basal heat flow and sediment compaction on overpressure development in evolving sedimentary basins. The model integrates predicted groundwater temperature pressure distribution with thermal maturation simulations. programme uses Arrhenius kinetic simulate kerogen–oil or oil–gas conversion processes. Such processes result an increase fluid volume since oil gas generated are less dense than their...

China’s socioeconomic transitions have dramatically accelerated its economic growth in last three decades, but also companioned with continuous environmental degradation. This study will advance the knowledge of heavy metal water pollution China from a spatial–temporal perspective. Specifically, this addressed following: (1) spatial patterns levels were analyzed using data prefecture-level cities 2004 to 2011; and (2) statistical methods used examine underlying physical factors behind...

This study aimed to develop a geochemical database by thoroughly analyzing groundwater and sediments from coastal aquifers of southwest Bangladesh. Moreover, we investigated the source sediment deposition mechanisms behind presence arsenic salinity in groundwater. The seasonal distribution patterns among shallow deep were found be 45.12 µg/l 20.65 during dry wet seasons, respectively. ranged 3262.88 mg/l 1930.88 seasons. Cored samples showed fine medium sands 92%, with silt clay particles....

This research demonstrates that biogenic pyrite formed by stimulation of indigenous sulfate-reducing bacteria (SRB) in a natural aquifer can remove dissolved arsenic from contaminated groundwater under strongly reducing conditions. SRB metabolism led to the precipitation nanoparticles capable sorbing and co-precipitating arsenic. The field site is an industrial where shallow unconfined sandy Therefore, biodegradable organic carbon, ferrous iron, sulfate, fertilizer were injected into began...

At the Sanders Lead car‐battery recycling plant, near Troy, AL, groundwater is highly acidic (pH varies from 3 to 3.5) and carries high concentrations of Pb, Cd, Zn, Cu, Fe. Pilot field experiments conducted at site show that in situ metabolism sulfate reducing bacteria (SRB) can produce desired geochemical effects remove heavy metal Cu groundwater. A reaction path model reduction shows redox potential (Eh) on mineral precipitation pH controls sorption different metals. strongly adsorbs...

We integrate groundwater geochemistry, mineralogy, and numerical modeling techniques to study the reactive transport of heavy metals isotopes in Eutaw coastal plain aquifer, Alabama. Geochemical data show that elevated concentrations Fe, Mn, Sr can be correlated with high pH alkalinity. These geochemical correlations suggest metal may derived from bacterial iron manganese reduction. Fe(III) Mn(IV) reduction shows biotransformation minerals could control mobility Fe Mn aquifers. Petrographic,...

Mathematical models are developed to study the propagation of excess pore pressure in heterogeneous and fractured rocks. For a homogeneous rock, time needed for front migrate downward is directly proportional square depth, inversely permeability rock. Variational studies show that highly influenced by heterogeneity crust. The results argue importance accounting geologic complexity when using mathematical estimate extent transmission increases hydraulic heads. presented paper used range...

Georgia in the Southeast USA. The 'water-rich' USA has long been thought to be immune climate change effects, leading unsustainable water withdrawals practices. This study analyzed impact of and human activities, e.g., irrigation on groundwater trends at 43 monitoring wells from 1981 2017 four distinct hydrogeologic provinces Georgia, We have corroborated trend analysis with surface analysis. deep confined Coastal Plain Floridan aquifer systems show statistically significant declines level....

We integrate groundwater geochemistry, microbiology, and numerical modeling techniques to study the origin of elevated salinity chemical evolution groundwaters in coastal plain aquifers Alabama. Our field data indicate that composition evolves by various geochemical microbial processes as it moves deeper into subsurface. Sequential peaks Ca 2+ , Mg K + Na along flow paths separation ions may be driven cation exchange. Microbial‐mediated reactions are important for formation several discrete...

Abstract Bioremediation methods that precipitate contaminants in situ as solid (mineral) phases can provide cost-effective options for removing dissolved metals contaminated groundwater. The current field-scale experiments demonstrate indigenous bacteria be stimulated to remove by injection of electron-donating substrates and nutrients into a aquifer. Groundwater at the investigation site is aerobic contains high levels lead, cadmium, zinc, copper, sulfuric acid (pH = 3.1) derived from...

Recent efforts to study the efficiency of aquifer remediation have led hydrogeologists realize that both small- and large-scale permeability heterogeneities a significant impact upon pump-and-treat in situ biorestoration operations. Numerical modeling techniques are used demonstrate how geologic complexity may affect bioremediation organic-contaminated groundwaters. The simulation approach is relatively simple implement, can serve didactic purpose its illustration heterogeneous aquifer....

Assessing the impacts of climate changes on water quality requires an understanding biogeochemical cycling trace metals. Evidence from research alluvial aquifers and coastal watersheds shows direct change fate transformation metals in natural environments. The case studies presented here use field data numerical modeling techniques to test assumptions about effects arsenic contamination groundwater aqui fers mercury bioaccumulation coastalsalt marshes. results show that rises sea level river...

Global climate change and its related impacts on water supply are universally recognized. In the past few years, drought affecting big metropolitan supplies alone have plagued Maryland Chesapeake Bay in 2001 through 2002, Lake Mead Las Vegas 2000 2004, Peace River Okeechobee South Florida 2006, Lanier Atlanta 2007 that especially affected resources distribution three states — Alabama, Florida, Georgia. One group of unnatural sites, namely crushed stone quarries, holds promise for expanding...

We demonstrate a method for sectioning sediment cores and extracting pore waters while maintaining oxygen-free conditions. A simple, inexpensive system is built can be transported to temporary work space close field sampling site(s) facilitate rapid analysis. Cores are extruded into portable glove bag, where they sectioned each 1-3 cm thick section (depending on core diameter) sealed 50 ml centrifuge tubes. Pore separated with centrifugation outside of the bag then returned separation from...

We demonstrate a method for sectioning sediment cores and extracting pore waters while maintaining oxygen-free conditions. A simple, inexpensive system is built can be transported to temporary work space close field sampling site(s) facilitate rapid analysis. Cores are extruded into portable glove bag, where they sectioned each 1-3 cm thick section (depending on core diameter) sealed 50 ml centrifuge tubes. Pore separated with centrifugation outside of the bag then returned separation from...