Chromium Contamination (Health and Safety) Articles

Development of a groundwater fungal strain as a tool for toxicity assessment

Despite the significant ecological role in groundwater the value of fungi as indicators of groundwater pollution is not known, as fungi are notoriously challenging to assess for toxicity because of their varied morphological components, in particular their filamentous structures. Hence they remain rarely used in environmental risk assessments and monitoring programs for aquatic systems. We ...

Sep. 15, 2014

By John Wiley & Sons, Ltd.

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

Screening of few aquatic floating plants for chromium phytoremediation

Phytoremediation process using hydrophytes emerges as an attractive scientific and engineering tool for the attenuation of metal pollution in the aquatic environment particularly in secondary and tertiary levels of wastewater treatment. The selection of appropriate plants on the basis of maximum uptake potential for engineering application of the process is the key factor. The present study deals ...

May 29, 2014

By Inderscience Publishers

Case study: How to purify Hexavalent Chrome Wastewater

We all talk about priority pollutants, about hazardous substances and discharge to the atmosphere etc. which are dangerous for our environmental. Day by day we adopt new laws and regulations to protect our green future. So, what is that “priority pollutants”? Priority pollutants are highly toxic chemicals. The list of these chemicals is quite large and includes thousands of items but ...

May 5, 2014

By GlobeCore GmbH

Waste water treatment, intensification of process

Among the various methods such as homogenizing, mixing, neutralization, sedimentation, filtering, ion exchange etc. ABC-100 PC GlobeCore production is machines with vortex layer and it is widely used for: · wastewater treatment from hexavalent chromium and other heavy metals (under the influence of electromagnetic field we can extremely reduce reagent consumption at the ...

Feb. 14, 2014

By GlobeCore GmbH

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

Wastewater sterilization (purification): completely new method “vortex layer machine”

The purification and safe disposal (neutralization) of industrial waste water effluents represent a very important ecological problem. The principal problem or requirement involves reducing the concentration of harmful impurities to concentration levels below their maximum allowable concentration limits. In fulfilling this requirement the amount of fresh water consumption needed to maintain the ...

Jan. 22, 2014

By GlobeCore GmbH

Characteristic of wastewater and their analysis

Wastewater containing chromium and other heavy metals, is highly toxic effluents which require high-quality and efficient purification. Such effluents formed during electroplating, other types of chemical, electrochemical surface treatment of metal products such as chromium-plating, nickel-plating, copper-plating, zinc-plating, cadmium-plating and also during some technological processes. These ...

Jan. 13, 2014

By GlobeCore GmbH

Treatment of hexavalent chromium by using a combined Fenton and chemical precipitation process

This work aimed to remove hexavalent chromium and three treatment schemes were examined based on a laboratory scale design: (a) Fenton process, (b) precipitation process, and (c) Fenton process followed by precipitation process. Variations of this study including pH, Fenton and precipitation reagents (molar ratio of Fe2+/H2O2 and FeCl3), contact time, and initial concentration of ...

Nov. 20, 2013

By IWA Publishing

Removal of COD, colour and heavy metal from wastewater using electro–chemical technique

The effects of applied electric charge (0–200 Amp–min) and pH on the removal of colour and COD from textile wastewater have been analysed. Mild steel plates have been used as electrodes in both parallel and series connections. For colour and COD removal, four electrodes each with a surface area of 177.3 cm² and with inter–electrode distance of 2.3 cm in parallel connection ...

Oct. 28, 2013

By Inderscience Publishers

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

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

Groundwater treatment with the use of zero-valent iron in the PRB Technology

The industrial dumping sites located in the southern provinces of Poland pollute the groundwater with metals. In the article, the possibility of groundwater (polluted by metals) treatment with the use of PRB Technology has been presented. In this technology, the contaminants are removed from the aquifer by the flow of the groundwater through a PRB filled with a special reactive material. The ...

May 17, 2013

By IWA Publishing

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

Chemical changes in an Oxisol cultivated with maize (Zea mays, L.) after six years disposal of sewage sludge

Sewage sludge is composed of predominantly organic matter and can be used to improve soil characteristics, such as fertility. Therefore, its application in agriculture is an adequate alternative for its final disposal. However, there is a lack of information on its long–term effects on soil changes in tropical areas. Thus, the objectives of this study were to determine: (a) the effect of sewage ...

Dec. 4, 2012

By Inderscience Publishers

Mechanistic sediment quality guidelines based on contaminant bioavailability: Equilibrium partitioning sediment benchmarks

Globally, estimated costs to manage (i.e., remediate and monitor) contaminated sediments are in the billions of U.S. dollars. Biologically based approaches for assessing the contaminated sediments which pose the greatest ecological risk range from toxicity testing to benthic community analysis. In addition, chemically based sediment quality guidelines (SQGs) provide a relatively inexpensive ...

Oct. 11, 2012

By John Wiley & Sons, Ltd.

Evaluation of geomembrane, amended soil and composite liner system as lining materials for chromium decontamination in landfill site

A comprehensive laboratory and field–scale study was performed to explore the efficacies of geomembrane, amended soil liner material and composite liner packs for using as containment liner systems for attenuating chromium transport emanating from a chrome laden solid waste disposal site. Soil samples were collected from the site and were admixed with different amended materials, such as rice ...

Sep. 26, 2012

By Inderscience Publishers

Release behaviour of chromium from ferrochrome slag

Huge amount of ferrochrome slag, a solid waste is being generated from submerged electric arc furnace during manufacturing of ferrochrome alloy. The waste slag contains about 6–12% chromium as chromium oxide and it has the potentiality of releasing hazardous chromium compounds. Although chromium exists in the slag as highly immobile Cr (III) state, there is possibility of chromium release under ...

Sep. 26, 2012

By Inderscience Publishers

Use of chemically treated sawdust for chromium removal from aqueous solutions: effect of process parameters

This paper reports the effect of various process parameters on the removal of chromium from aqueous solution using formaldehyde–treated timber industry waste (sawdust). The adsorbent was characterised by Scanning Electron Microscopy (SEM) and Energy Dispersive X–Ray Analysis (EDAX). Influence of chromium concentration, pH, adsorbent dose and contact time on chromium removal from aqueous solution ...

Aug. 2, 2012

By Inderscience Publishers

Removal of ionic metals from wastewaters of COD determinations

Chemical Oxygen Demand (COD) determinations generate highly disruptive waste streams with chromium, mercury and silver. These should follow specific waste management approaches in search of environmental and economical benefits, for which this work reports simple chemical procedures allowing toxic metal removal. Chromium(VI) is reduced to chromium(III) and total chromium is precipitated with ...

Aug. 2, 2012

By Inderscience Publishers

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