groundwater contaminant Articles
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Barstow, California - Case Study
From Contaminated Groundwater to Potable Water Due to the presence of serious contaminants and potentially hazardous material in groundwater, there is an increasing threat to human health. Regions like the West and the Midwest with high concentrations of livestocks has already suffered from groundwater contamination. Facilities that use groundwater as tap water recognized the potential dangers ...
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Domestic wastewater treatment with a decentralized, simple technology biomass concentrator reactor
A new type of membrane-like aerobic reactor initially designed for the degradation of hydrocarbon-derived groundwater contaminants was tested for treating domestic wastewater. The biomass concentrator reactor (BCR) consists of an enclosed, aerated tank containing a graded filtration medium with the function of solids separation, and was previously used to treat industrial wastewaters ...
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Contaminated Groundwater Cleaned by Granular Carbon System
Untitled Document Summary: A granular activated carbon system developed by Calgon Corp., is being used to remove various toxic materials from contaminated groundwater at the U.S. Army's huge Rocky Mountain Arsenal near Denver, Colo. The pilot containment/treatment project, which went into full operation in late August, 1978, has been described as one of the ...
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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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Risk of diarrhoea from shallow groundwater contaminated with enteropathogens in the Kathmandu Valley, Nepal
Shallow groundwater is the main water source among many alternatives in the Kathmandu Valley, Nepal, which has a rapidly growing population and intermittent piped water supply. Although human pathogens are detected in groundwater, its health effects are unclear. We estimated risk of diarrhoea from shallow groundwater use using quantitative microbial risk assessment. Escherichia coli, Giardia ...
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Plant algae method for arsenic removal from arsenic contaminated groundwater
Field studies were carried out in Urumqi River Basin in Northwest China. The study focused on experimentation on a plant algae method that was tested by taking various water chemistries into consideration. The results from a greenhouse experiment evaluated for four doses of P (0, 100, 200, and 300 μmol/L) using two ferns (30 and 60 day old) on 15 L of contaminated groundwater per plant revealed ...
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Water intake protection system
Introduction One of the very first steps in any drinking and clean Water Treatment Plant (WTP) is the abstraction of water from a water source. Typical water sources used for these applications include boreholes, springs, rivers, reservoirs, lakes and the sea. Each water source presents a specific set of challenges and characteristics yet they may all be subject to anthropogenic pollution ...
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Efficacy of arsenic filtration by Kanchan Arsenic Filter in Nepal
Groundwater arsenic contamination has caused a significant public health burden in lowland regions of Nepal. For arsenic mitigation purposes, the Kanchan Arsenic Filter (KAF) was developed and validated for use in 2003 after pilot studies showed its effectiveness in removing arsenic. However, its efficacy in field conditions operating for a long period has been scarcely observed. In this study, ...
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Rescuing California`s Smaller Water Systems
Decentralized solutions can provide high-quality treatment for water systems in small and remote communities The California Drinking Water Needs Assessment released this spring warned that the state is dotted with smaller water systems that are in trouble and that it will take billions of dollars to remedy the situation. Gregory Pierce, the assessment’s principal investigator, described ...
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Supreme Court Ruling Spurs Rethink of Aquifer Use
With groundwater supply down and demand up, new sharing policy demands a creative approach that can include water reuse and aquifer recharge A United States Supreme Court decision that a Memphis, Tennessee, water utility wasn’t illegally taking groundwater from Mississippi could have nationwide ramifications over increasingly scarce groundwater, according to legal experts. In the unanimous ...
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Sustainability of decentralized wastewater treatment technologies
In many Countries, small communities are required to treat wastewater discharges to increasing standards of lesser environmental impacts, but must achieve that goal at locally sustainable costs. While biological membrane treatment (membrane bio-reactors (MBRs)) is quickly becoming the industry standard for centralized wastewater treatment plants, and would also be ideally suited also for ...
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The Federal Interim Groundwater Quality Guidelines
The Federal Interim Groundwater Quality Guidelines was developed by federal authorities to facilitate the assessment, remediation and risk management of federal contaminated sites which are under the funding of the Federal Contaminated Sites Action Plan (FCSAP). The guidelines are applicable in Canada until the time when groundwater guidelines will be developed. FCSAP was established to identify ...
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In situ Chemical Oxidation: An Innovative Groundwater Remediation Technology
A promising new technology, in situ Chemical Oxidation (ISCO), has the potential to supplant the more widely used pump-and-treat groundwater remediation technology by destroying groundwater contamination in situ (in place). ISCO is the process of oxidizing contaminants in the groundwater and soil by injecting water containing high concentrations of an oxidant to the site of the contamination. ...
By AECOM
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The Long Island Lie: Emerging Contaminants Tainting Drinking Water and the Company with a Solution
When Grumman partnered with the U.S. Navy to establish a manufacturing, research and testing facility in Bethpage, N.Y. nobody would have anticipated the challenges that would plague the greater Long Island community some eighty-years later. Established on a sprawling 600-acre plot in the late 1930s, the facility aided in providing the United States military with means to defend the freedom of ...
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Effect of nitrate concentration, pH, and hydraulic retention time on autotrophic denitrification efficiency with Fe(II) and Mn(II) as electron donors
The role of electron donors (Fe2+ and Mn2+) in the autotrophic denitrification of contaminated groundwater by bacterial strain SY6 was characterized based on empirical laboratory-scale analysis. Strain SY6 can utilize Fe2+ more efficiently than Mn2+ as an electron donor. This study has shown that the highest nitrate removal ratio, observed with Fe2+ as the electron donor, was approximately ...
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Drought Shifts Chinas Focus to Infrastructure
Hydropower crisis and climate change prompt new water projects This year’s record heat wave in China has dried up large swaths of the Yangtze River basin, and the drought has caused a continuing hydropower crisis in the southwest. The drought is affecting groundwater and agriculture. It is estimated that 80% of China’s groundwater is contaminated with toxins, including heavy metals ...
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A performance assessment of arsenic-iron removal plants in the Manikganj District of Bangladesh
In Bangladesh, arsenic contamination of groundwater, microbial contamination of surface water and seasonally variable rainfall make reliable access to acceptable quality drinking water a challenge. Arsenic-iron removal plants (AIRPs) are a relatively inexpensive way of removing arsenic from groundwater for access to safer drinking water. This study evaluated the performance of 21 (of 105) AIRPs ...
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Organoclay MRM removes mercury from New Jersey construction site - Case Study
Location East Rutherford, New Jersey Products Used Organoclay MRM A national remediation contractor was tasked with the construction and operation of a groundwater treatment system for a large excavation site in East Rutherford, NJ. The site owner is a multinational chemical company, and the groundwater was contaminated with organics, arsenic, and mercury. The design engineer specified ...
By CETCO
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Polyphosphates for in situ uranium immobilization - Case Study
INFORMATION Carus Corporation has a long history of developing and providing a variety of permanganate products for chemical oxidation applications. Carus is also a leading provider of phosphate products for sequestration and corrosion control. Phosphates are widely used as water treatment chemicals (dry or liquid solutions) to correct problems resulting from inorganic groundwater contaminants ...
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In-situ biological denitrification using pretreated maize stalks as carbon source for nitrate-contaminated groundwater remediation
A simulation apparatus of in-situ groundwater remediation (SAIR) that used maize stalks pretreated with sodium hydroxide (MSSH) as a carbon source was designed for nitrate-contaminated groundwater treatment. Two experiments, RA and RB, were constructed in this SAIR. The removal performance of SAIR fed with real nitrate contaminated water was investigated under static and dynamic conditions. ...
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