chromium waste (Chromium Contamination

Removal of chromium(III) from aqueous waste solution by liquid–liquid extraction in a circular microchannel

A new circular microchannel device has been proposed for the removal of chromium(III) from aqueous waste solution by using kerosene as a diluent and (2-ethylhexyl) 2-ethylhexyl phosphonate as an extractant. The proposed device has several advantages such as a flexible and easily adaptable design, easy maintenance, and cheap setup without the requirement of microfabrication. To study the ...

Jun. 24, 2017

By IWA Publishing

Chromium toxicity

Chromium, in the form of unidentified chromium compounds, occurs naturally in the earth’s crust and is widely distributed in air, water, soil, and food. Chromium (3+) is an essential trace element in humans. The general population is exposed to some chromium (6+) compounds, but the levels of exposure vary. Environmental exposure specifically to chromium(6+) compounds is difficult to quantify, ...

Aug. 17, 2007

By Valahia University

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

Refined style of leather case study

Leather shoes, jackets and accessories form the core of many outfits. Before turning into wearable products, leather undergoes a manyphased process including pickling, deliming and tanning. Kemira’s formic acid has been used for many years in the production of soft, top quality leather. The totally biodegradable acid promotes the even absorption and fixation of dye, and helps to keep the ...

Jun. 12, 2009

By Kemira Water Solutions, Inc.

Removal of hexavalent chromium from aqueous solution by lignocellulosic solid wastes

The batch removal of Cr(VI) from aqueous solution using lignocellulosic solid wastes such as sawdust and pine leaves under different experimental conditions was investigated in this study. The influence of pH, temperature, contact time, initial concentration of Cr(VI) and particle size on the chromium removal was investigated. Adsorption of Cr(VI) is highly pH-dependent and the results indicate ...

Jun. 25, 2006

By Center for Environment and Energy Research & Studies (CEERS)

Phytoremediation of chromium(VI)-laden waste by Eichhornia crassipes

The aim of the present investigation is to develop a suitable phytoremediation technology for the procumbent removal of chromium(VI) in tannery wastewater. Water hyacinth species, Eichhornia crassipes, was chosen to remediate chromium from synthetic wastewater. Present study revealed 88% Cr(VI) removal in synthetic wastewater sample within 48 hours of the study at all concentrations ranging from ...

Mar. 30, 2011

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

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

Heavy metal contamination in water and sediments of an estuary in southeastern Turkey

The geochemical characteristics of some heavy metals (Cr, Cd, Pb, Zn and Ni) in the river and sea sediments, in the soil and in the river and groundwater of an estuary on the southeast coast of Turkey have been studied. In the sea sediments, the wastes from a chromium factory control these metal concentrations. The heavy metal contamination in the river sediments results from an existing chromite ...

Sep. 7, 2004

By Inderscience Publishers

Use of earthworms (Eisenia fetida) and vermicompost in the processing and safe management of hazardous solid and liquid wastes with high metal contents

Two feasibility studies using the earthworm (Eisenia fetida) and vermicompost in the processing and remediation of solid and liquid wastes with high metal content are presented: vermicompost as adsorbent substrate for remediation of wastewaters contaminated with metals; earthworms for remediation of arsenic (As) and mercury (Hg) in landfill soils. The feasibility of vermicompost for the ...

Dec. 2, 2010

By Inderscience Publishers

Electrochemical treatment of spent tan bath solution for reuse

A spent tanning bath contains high concentration of salts, chromium and protein. The treatment system for removal of chlorides or chromium from this effluent is expensive. In this context this waste has to be reused. Our study focuses on the application of advanced oxidation processes for protein removal present in a tanning bath. To improve the quality of the chromium tanning bath, two ...

Dec. 9, 2016

By IWA Publishing

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

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

Chrome plating process achieves cost reduction through zero liquid discharge - Case Study

A global manufacturer of automotive components was faced with rising costs related to waste disposal from a Chrome plating process used in a plant in Poland. The plant manufactures shock absorbers for passenger vehicles. The plating of the shocks adds corrosion resistance, increased surface hardness, and improves cleaning ability and overall appearance. Project Goals: Reduce waste disposal ...

Apr. 23, 2015

By PRAB, Inc

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

Removal of chromium(III) from water samples by a low-cost sorbent: application to a mixture of chromium(III) and chromium(VI)

Adsorption of Cr(III) and Cr(VI) ions from aqueous solutions and water samples has been investigated using Powdered Marble Waste (PMW). The effect of solution pH, initial metal concentration, sorbent dose, shaking time, temperature, and foreign ions on the adsorption of Cr(III) was studied. It was found that the sorption capacity increased with the increase of Cr(III) concentration and ...

Feb. 11, 2010

By Inderscience Publishers

Adsorption of chromium from wastewater by platanus orientalis leaves

The presence of heavy metals in drinking water can be toxic to consumers; these metals can damage nerves, liver and bones and 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 concerted efforts towards pollution abatement .Among the different heavy metals from toxic pollutant ...

Jun. 28, 2007

By University of Tehran

Biological Reduction of Hexavalent Chromium: A Potential Strategy for the Bioremediation of Cr(VI)-Pollutied Wastewater

ABSTRACTThe potential for biological treatment of Cr (VI)- polluted wastewaters has attracted increased interest, because this alternative is more efficient and less expensive than conventional physicochemical treatments. In this work, a microbial enrichment capable of tolerating and reducing high Cr(VI) was isolated. The kinetic parameters of the Cr(VI) reduction process indicate that the ...

Oct. 22, 2006

By Water Environment Federation (WEF)

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

Manufactures brake and suspension systems

The Customer is a premier chassis supplier, with branches in many different countries worldwide, that designs and manufactures brake and suspension systems for the global transportation market. The Customer needs to reduce the high costs related to: • the disposal of the highly polluting and corrosive waste water coming from hard chromium plating line; • the operation of the galvanic ...

Nov. 16, 2017

By EVALED-Evaporator

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