chromium contamination (Chromium Contamination

Detoxification of chromium slag and contaminated soil

Chromium slag and contaminated soil are significant risks to human health. Their detoxification is a difficult problem. In this study, we tried to detoxify the chromium slag and contaminated soil by a solid reduction method. The final product is ceramist. The mechanism and process of detoxification of chromium slag and contaminated soil were studied. The residues of Cr (VI) are lower than 0.004 ...

Jan. 22, 2014

By Inderscience Publishers

Removal of chromium (vi) from aqueous solution by ulmus leaves

The presence of heavy metals in thinking water sources and in edible agricultural crops can be harmful to human. It is well known that heavy metals can be toxic, e.g. they damage nerves, liver and bones and they block functional groups of vital enzymes (Ewan and Pamphlet, 1996). In the recent years, increasing awareness of water pollution and its far reaching effects has prompted efforts towards ...

Mar. 28, 2006

By University of Tehran

Evaluation of sodium lignosulphonate for the remediation of chromium–contaminated soil and water

Commercial sodium lignosulphonate, a by–product of sulphite pulp leaching, was evaluated for the remediation of soil and water contaminated with hexavalent chromium. Two series of bench–scale tests were performed: (a) removal of chromium from water using reagent binding and membrane separation; and (b) stabilisation of chromium in the soil using chemical soil flushing. Water treatment tests were ...

Oct. 3, 2013

By Inderscience Publishers

Surface Decontamination of Chromium Compounds (Potassium Chromate (K2CrO4) by DeconGel 1101

ABSTRACT Surface decontamination efficacy determination of DeconGelTM 1101 on stainless steel, carbon steel, and concrete surfaces contaminated with Potassium Chromate (K2CrO4) was performed with ICP-OES (Inductively Coupled Plasma-Optical Emission Spectroscopy) according to Environmental Protection Agency (EPA) SW-846 Methods: 3005A (sampling) and 6010C (analysis). HAZARDOUS MATERIALS RELEVANCE ...

Jun. 29, 2015

By Industrial Chem Solutions, Inc. is a subsidiary of Worldwide Specialty Chemicals, Inc.

NUBIOLA: Investigation & Remediation of contaminated soil, groundwater & buildings (Phases I,II,III)

The industrial activity of the factory Nubiola, pigment manufacturers since 1914, caused contamination of the soil, the groundwater and the buildings on the site. The identified contamination showed Chromium VI, various other metals, sulphates and oils. The objective: remediate the site environmentally in order to be reutilised as a residential ...

Feb. 20, 2008

By MediTerra Environmental Consultants, S.L.

Heavy metal levels in tap water in Batina Region, Oman

Most household in Batina depend on private wells for their fresh water supplies. The quality of such water is not regulated or tested by authorities and, therefore, consumers' health might be at risk if water is contaminated. We assessed the contribution of some heavy metals to water pollution. Water samples from 364 houses were collected and analysed for levels of lead, chromium, nickel and ...

Nov. 8, 2007

By Inderscience Publishers

Modelling biological Cr(VI) reduction in aquifer microcosm column systems

Several chrome processing facilities in South Africa release hexavalent chromium (Cr(VI)) into groundwater resources. Pump-and-treat remediation processes have been implemented at some of the sites but have not been successful in reducing contamination levels. The current study is aimed at developing an environmentally friendly, cost-effective and self-sustained biological method to curb the ...

Jun. 21, 2013

By IWA Publishing

Utilisation of Andisols as possible low-cost adsorbent to remove Cr (VI) from aqueous solution

The potential of using Andisols to remove Cr (VI) from aqueous solution was evaluated by batch and column experiments. The results showed that the A-horizons (Isarog: 63%; Mandalagan: 42%) of the soils have lower adsorption capacity compared to B-horizons (Isarog: 93%; Mandalagan: 66%) using a dose of 20 g/L and Cr (VI) concentration of 10 mg/L. The adsorption capacity of B-horizons using column ...

Feb. 11, 2010

By Inderscience Publishers

In-Situ Remediation of Heavy Metals Using Sulfur-Based Treatment Technologies

THE METALS PROBLEM: Highly toxic and highly soluble metals are contained in numerous waste streams including those from power, chemical, electronics facilities, general manufacturing plants, and mining facilities. Lead, chromium, arsenic, zinc, cadmium, copper, and mercury are the most common metal contaminants found on remediation project sites (US EPA, October, 2000). Cyanide is a common ...

Feb. 15, 2019

By Graus Chemicals, LLC

Hexavalent chromium removal by using synthesis of polyaniline and polyvinyl alcohol

Over the past few years, heavy metals have been proved to be one of the most important contaminants in industrial wastewater. Chromium is one of these heavy metals, which is being utilized in several industries such as textile, finishing and leather industries. Since hexavalent chromium is highly toxic to human health, removal of it from the wastewater is essential for human safety. One of ...

Sep. 1, 2016

By IWA Publishing

Researchers: Carcinogen Can Occur Naturally in Water

Representatives of the U.S. Fish & Wildlife Service and Duke Energy take samples on the Dan River, which was polluted by a coal ash spill. Scientists have found that hexavalent chromium in well water, long attributed to coal ash contamination, may occur naturally. Hexavalent chromium is a carcinogen found in drinking water supplies. Many have thought its presence is due to human activity, ...

Dec. 21, 2016

By Fluence Corporation

The removal of Cr(VI) from aqueous solution by almond green hull waste material: kinetic and equilibrium studies

The discharge of industrial effluents containing hexavalent chromium into the environment can be very harmful to living things. Therefore, prior to effluent discharge into the environment, hexavalent chromium should be removed from contaminated water and especially from wastewaters. In the present work, almond green hull powder (AGHP) was investigated for the removal of hexavalent chromium ...

Oct. 4, 2016

By IWA Publishing

What is Hexavalent Chromium?

The dangerous compound made famous by the movie Erin Brockovich can occur naturally or through industrial pollution Hexavalent chromium, a toxic compound sometimes found in water, is a carcinogenic form of the metal chromium in an oxidation state. It’s also known as chromium-6 or Cr (VI). It’s both odorless and tasteless, and it can be found naturally in rocks, soil, and plants. It ...

Jul. 29, 2020

By Fluence Corporation

Prominant developer chooses cetco gas vapor barrier for chromium protection case study

Project: Droyers Point Location: Jersey City, NJ Products: Liquid Boot® Gas Vapor Mitigation System Background: During the summer of 2004, construction commenced on a multi-family housing plan, developed by K. Hovnanian Homes. This 23-acre Brownfield redevelopment project included 30 new three-story townhouse buildings situated along the Jersey City shoreline in New Jersey. Challenge: The ...

Feb. 15, 2013

By CETCO

Research on the process-based risk evaluation method of groundwater pollution for contaminated site

A universal method to evaluate groundwater pollution risk with the site scale has not been established. The groundwater pollution risk is commonly evaluated by overlaying the results of groundwater vulnerability and pollution sources, but this method is inapplicable for contaminated sites. Considering the current supervision demands of groundwater pollution in China, this paper suggests a ...

Aug. 13, 2015

By IWA Publishing

Removal of chromate ion from contaminated synthetic water using mcm-41/zsm-5 composite

The increasing contamination of urban and industrial wastewater by toxic metal ions is a worrying environmental problem. These inorganic micro-pollutants are of considerable concern because they are non-biodegradable, highly toxic and have a probable carcinogenic effect (Modani et al., 1996). In view of their high toxicity for human health, heavy metal concentrations in wastewater are restricted ...

Dec. 28, 2007

By University of Tehran

Assessing natural contents of hazardous metals in soils by different analytical methods and its impact on environmental legislative measures

A variety of analytical techniques are commonly used to assess natural metal concentrations in soils. Although the choice of the analytical procedure may appear to be an unimportant issue, through an example from the Po Plain we document that for specific hazardous metals the arbitrary choice between separate analytical techniques may have contrasting legislative implications. Comparative ...

Feb. 20, 2012

By Inderscience Publishers

Heavy metal speciation and mobility assessment of arid soils in the vicinity of Al Ain landfill, United Arab Emirates

Sixty-four surface soil samples taken in the vicinity of Al Ain landfill were analysed for cadmium, chromium, copper, nickel, lead and zinc by inductively coupled plasma spectroscopy. Extraction techniques were used to establish the association of the total concentrations of the six metals in the soil samples with their contents in the exchangeable, carbonate, iron/manganese oxides, and residual ...

Jan. 28, 2005

By Inderscience Publishers

Confidential Site (ISOTEC Case Study 60) Injection of calcium polysulfide for in-situ treatment of heavy metals (hexavalent chrome)

ISOTEC was retained to implement a calcium polysulfide (CAPS) treatment program at a confidential site in northern New Jersey to address heavy metal impacted soils. The target contaminant of concern (COC) was hexavalent chromium [Cr (VI)]. Concentrations of Cr (VI) in soils varied from less than 240 milligrams per kilogram (mg/kg) to as high as 1,770 mg/kg. Average Cr (VI) concentration of 100 ...

Mar. 15, 2011

By In-Situ Oxidative Technologies, Inc (ISOTEC) - Soil & Groundwater Remediation

Deadly Hexavalent Chromium in Soil

Merging technologies will change over Hexavalent Chromium in soil to Trivalent Chromium, effectively stopping Hexavalent Chromium from becoming dangerously airborne or becoming even more deadly by migrating into the water table. There are three valences of Chromium: 1) Chromium—safe to humans, 2) Trivalent Chromium—safe and an essential element in humans and 3) Hexavalent ...

Aug. 1, 2014

By Abcov Companies , LLC

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