arsenic removal Articles
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Effect of co-existing copper and calcium on the removal of As(V) by reused aluminum oxides
Among the various heavy metals, arsenic is frequently found in abandoned mine drainage and the environmental fate of arsenic in real aqueous solutions can be highly dependent on the presence of co-existing ions. In this study, removal of arsenate through adsorption on the reused aluminum oxide or through precipitation was investigated in a single and in a binary system as a function of pH and ...
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Fe-FeS2 adsorbent prepared with iron powder and pyrite by facile ball milling and its application for arsenic removal
Arsenic is one of the major pollutants and a worldwide concern because of its toxicity and chronic effects on human health. An adsorbent of Fe-FeS2 mixture for effective arsenic removal was successfully prepared by mechanical ball milling. The products before and after arsenic adsorption were characterized with scanning electron microscopy, X-ray diffraction, Fourier transform infrared ...
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EPA Arsenic - Demonstration Projects
AdEdge Technologies, Inc. was selected by USEPA through an expert peer review process in cooperation with the individual host sites to conduct full scale arsenic treatment demonstrations using its Granular Ferrric Oxide Adsorption Technology. The program is designed to gather further cost and performance data on commercially available, proven technologies which are candidates to become Best ...
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Arsenate removal using a combination treatment of precipitation and nanofiltration
A combination treatment of Ca-precipitation and nanofiltration membrane was studied to remove arsenate from water. The selected nanofiltration membrane was an amphoteric charged membrane, proved by the results of ATR-FTIR spectra and zeta potential. The arsenate and calcium removal efficiencies had the lowest values at the isoelectric point of the nanofiltration membrane, attributed to the ...
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Treatment and remediation methods for arsenic removal from the ground water
Globally, ground water is contaminating by arsenic continously, which needs economic treatment and remediation technologies. Physical, chemical and biological treatment methods have been developed, that include different kinds of filters, bucket type units, fill and draw, kalshi etc. The remediation methods discussed are air oxidation, reactive barriers, utilisation of deeper aquifers and ...
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A novel approach to determine a resin's sorption characteristics for the removal of natural organic matter and arsenic from groundwater
The objective of this work was to study the sorption behavior of the strongly basic and macroporous commercial resin IRA 958-Cl for the removal of natural organic matter (NOM) from groundwater in the Melenci settlement located near Zrenjanin (Northern Serbia). The investigation was performed in a pilot plant using native groundwater and the same water after chlorination with sodium hypochlorite. ...
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Spring Creek Utilities, NV Arsenic Removal - Case study
In June 2011, AdEdge Water Technologies was contacted by Sunrise Engineering to design, manufacture, and start up an arsenic removal system for the Spring Creek Utilities Company located in Elko, Nevada. The existing water system consisted of three wells feeding into a centralized distribution system with a maximum capacity of 1950 GPM and serves a population of 1500 residents. The AdEdge ...
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The effect of co-existing solutes on arsenate removal with hydrotalcite compound
Hydrotalcite (HTAL-Cl), an inorganic anion exchanger, is of use as an adsorbent for the removal of arsenate (As(V)) in water systems. The adsorption properties of HTAL-Cl for As(V) and the effects of co-existing anions on the As(V) removal performance were investigated in this work. Under the conditions of pH≥4, the adsorption capacity for As(V) gradually decreased with an increase of pH, but ...
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Hand-pump subsurface arsenic removal: the effect of groundwater conditions and intermittent operation
Hand-pump subsurface arsenic removal (SAR) has been investigated in rural Bangladesh with different groundwater conditions and intermittent operation modes. Multiple injection-abstraction cycles were performed after injection of 1 m3 of aerated water. From these experiments it can be concluded that hand-pump SAR, in the traditional injection-abstraction design, does not provide drinking water ...
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Spring Creek Utilities, Nevada - Case Study
In June 2011, AdEdge Water Technologies was contacted by Sunrise Engineering to design, manufacture, and startup an arsenic removal system for the Spring Creek Utilities Company located in Elko, Nevada. The existing water system consisted of three wells feeding into a centralized distribution system with a maximum capacity of 1950 gpm and serves a population of 1500 residents. The AdEdge ...
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Distribution of iron in activated carbon composites: assessment of arsenic removal behavior
The main objectives of this study were to evaluate the effectiveness of using iron impregnated granular activated carbon (AC) to remove arsenic from water and to assess the partitioning behavior of arsenic under a variety of conditions. Iron impregnated granular activated carbon (AC-Fe) composites were prepared with different ferric (Fe+3) concentrations, ranging from 0.09 to 3.0 M. These ...
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Taos, New Mexico SORB 33® Arsenic Removal Case Study
Site BackgroundThe Town of Taos, located in northern New Mexico and with a population of 8,000 was awarded an arsenic removal treatment system as part of the US EPA’s Arsenic Removal Demonstration Program in January, 2005. The town had a new well, storage tank and booster pump system that was scheduled to be connected to the Town’s distribution system and placed into service only after the ...
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Monitoring of a pilot GFO filter for removal of low-concentration arsenic in water
Many water treatment plants (WTPs) were designed to remove ammonia, iron, and manganese simultaneously using biofilters. In some cases (especially in the Pianura Padana area, in Italy) such plants were designed without a specific treatment stage for arsenic removal because its concentration in the groundwater (i.e. 10 to 20 μg/L) was lower than the previous maximum contaminant level (MCL) of ...
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Lead and Arsenic Removal - Case Study
City of CincinnatiThe Airport was built on a former military firing range and apple orchard. To complete the removal of all the lead and arsenic, we excavated and removed over 20,000 tons of treated and non-treated contaminated soil. Then we stabilized 11,000 tons of hazardous soil on site. We graded and capped the site all while complying with FAA, City and Airport Officials. Once the lead and ...
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Preliminary studies of the oxidation of arsenic(III) by potassium ferrate
Potassium ferrate was synthesized using ferric chloride, and its effects on the oxidation of arsenic(III) in water treatment were investigated. Under given coagulation conditions, the effects of several factors on arsenic oxidation efficiency were examined, which include the mole ratio of Fe(VI) and As(III) added in water and the time elapsed between the addition of potassium ferrate and the ...
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Removal of arsenic from anthropogenic aqueous media: an analytical review with particular reference to solvent extraction technique
Arsenic is an environmental toxicant, which is known to cause serious ailments to humans and its presence in drinking water poses grave threat to millions of people all over the world. Apart from being drinking water pollutant, arsenic poses another dimension of problem in the recovery of metals from some of the sulfide ores, namely copper pyrites and galena. These were the two main reasons to ...
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Arsenic removal by ferric-chloride coagulation – effect of phosphate, bicarbonate and silicate
Jar tests with synthetic water were carried out in order to investigate the effect of phosphate, bicarbonate and silicate on arsenic removal efficiency by in-situ formed ferric hydroxide. Above 12 mg C/L inorganic carbon concentration, the adverse effect of bicarbonate was definite, and resulted in higher remaining arsenic concentration. At all pH values (7.5–7.8) and coagulant dosages (0.84–3.00 ...
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Equilibrium and kinetic studies for the adsorption of arsenic from aqueous medium using Cyanex 301–impregnated natural and synthetic fibrous supports
The direct decontamination of As(III), the more toxic species of arsenic has been developed in the present research work using the fibrous supports impregnated with the extractant Cyanex 301. Bis (2,4,4–trimethylpentyl) dithiophosphinic acid (Cyanex 301) was used as an extractant for impregnating the fibrous supports namely the natural oil catcher (OC) and the synthetic kapok fibre (KFO). Batch ...
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Brown City Michigan SORB 33 Arsenic Removal
Site Background The City of Brown City, Michigan located about 60 miles north of Detroit, was awarded the first of the US Environmental Protection Agency’s (EPA) treatment systems as part of the EPA Arsenic Removal Demonstration Program in June 2003. The EPA and its team of consultants on the Demonstration Program panel selected Severn Trent Services’ SORB 33® arsenic adsorption system for use ...
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Arsenic removal using novel combined Fe/Mn adsorbent modified with silica
Arsenic pollution has become a dominant environmental concern in recent years. Various techniques for arsenic removal from water have been developed. However, these techniques efficiently remove arsenic from drinking water but require toxic and expensive chemicals and generate a large amount of exhaust sludge, which is not always regenerable. In this study a novel Fe-Mn-Si oxide material was ...
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