Hexavalent chromium reduction using a fixed bed of scrap bearing iron spheres

El-Shazly, A.H.; Mubarak, A.A.; Konsowa, A.H.

doi:10.1016/j.desal.2005.03.083

Cited by 37 publications

(19 citation statements)

References 9 publications

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“…Nevertheless, most studies indicated a favourable effect of temperature on Cr (VI) reduction rate. Column experiments carried out by El-Shazly et al (2005) showed that the mass transfer coefficient and rate of Cr(VI) reduction with scrap iron spheres increased by increasing solution temperature from 25°C to 60°C (El-Shazly et al 2005). Examining the effect of temperature on the reduction of Cr(VI) with scrap iron for temperature values ranging from 10°C to 40°C, Gheju and Iovi (2006) reported the increase of reduction rate with increasing temperature.…”

Section: Effect Of Temperaturementioning

confidence: 94%

“…The second pathway, homogenous (indirect) Cr(VI) reduction, involves Cr(VI) reduction by dissolved Fe 2+ ions formed in Eq. 26 (Bowers et al 1986;El-Shazly et al 2005;Lee et al 2010;Noubactep 2010d):…”

Section: Mechanism Of Cr(vi) Reduction By Zvimentioning

confidence: 98%

“…Column studies carried out at an initial Cr(VI) concentration ranging from 250 to 750 mg/L showed that the amount of treated solution decreased with the increase of Cr(VI) concentration (Ozer et al 1997). Experiments conducted by El-Shazly et al (2005) using scrap iron spheres revealed that the rate of reduction reaction decreased by increasing the initial K 2 Cr 2 O 7 concentration from 5 to 100 mM. Evaluating the removal of Cr(VI) from water using waste and commercial ZVI particles, Lee et al (2003) noted that the reaction rates were inversely proportional to the initial Cr(VI) concentrations.…”

Section: Effect Of Initial Cr(vi) Concentrationmentioning

confidence: 98%

“…Several pathways were hypothesized for the reduction of hexavalent chromium with ZVI. The first pathway, heterogeneous (direct) Cr(VI) reduction, involves direct electron transfer from the ZVI surface to Cr (VI) (Bowers et al 1986;El-Shazly et al 2005;:…”

Section: Mechanism Of Cr(vi) Reduction By Zvimentioning

confidence: 99%

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Hexavalent Chromium Reduction with Zero-Valent Iron (ZVI) in Aquatic Systems

Gheju

2011

Water Air Soil Pollut

326

186

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Hexavalent chromium is a heavy metal used in a variety of industrial applications which is highly toxic to humans, animals, plants and microorganisms. Moreover, it is a well-established human carcinogen by the inhalation route of exposure and a possible human carcinogen by the oral route of exposure. Therefore, it should be removed from contaminated waters. Its reduction to trivalent chromium can be beneficial because a more mobile and more toxic chromium species is converted to a less mobile and less toxic form. During the last two decades, there has been important interest in using zero-valent iron (ZVI) as a Cr(VI)-reducing agent. A considerable volume of research has been carried out in order to investigate the mechanism and kinetics of Cr(VI) reduction with ZVI, as well as the influence of various parameters controlling the reduction efficiency. Therefore, the purpose of this review was to provide updated information regarding the developments and innovative approaches in the use of ZVI for the treatment of Cr(VI)-polluted waters.

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Section: Effect Of Temperaturementioning

confidence: 94%

Section: Mechanism Of Cr(vi) Reduction By Zvimentioning

confidence: 98%

Section: Effect Of Initial Cr(vi) Concentrationmentioning

confidence: 98%

Section: Mechanism Of Cr(vi) Reduction By Zvimentioning

confidence: 99%

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Hexavalent Chromium Reduction with Zero-Valent Iron (ZVI) in Aquatic Systems

Gheju

2011

Water Air Soil Pollut

326

186

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“…The results of these studies indicate that the rate of Cr(VI) removal is sufficiently rapid for groundwater remediation using permeable-reactive barriers. Ö zer et al (1997) used steel wool for reduction of hexavalent chromium in a continuous column; El-Shazly et al (2005) used scrap iron for the same purpose.…”

Section: Introductionmentioning

confidence: 99%

Commercial steel wool for reduction of hexavalent chromium in wastewater: batch kinetic studies and rate model

Mitra¹,

Banerjee²,

Sarkar³

et al. 2013

Int. J. Environ. Sci. Technol.

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The present study aims at searching the potential of commercial grade steel wool in reducing hexavalent chromium in aqueous phase under batch mode. About 30 % of the initial hexavalent chromium was found to reduce within 2 h at a pH of 3. However, on testing the combined effects of different process parameters, namely the solution pH, wool loading, etc., the optimum batch parametric condition has been fixed. A moving boundary type kinetic model, which takes into account the effect of passivation along with the direct reduction mechanism to simulate the gross uptake profile of Cr(VI) from the bulk solution is proposed. The effective pore diffusivity of Cr(VI) in commercial steel wool was determined by a suitable global optimization technique. Additionally, the model is also capable to simulate the decline of active external surface area of the wool caused by passivation with time. A good match of the experimental data and model-simulated transient bulk concentration of Cr(VI) (under optimum parametric condition only) establishes the general validity of the proposed model.

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Decontamination of Hexavalent Chromium-Polluted Waters: Significance of Metallic Iron Technology

Gheju

2017

Enhancing Cleanup of Environmental Pollutants

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Hexavalent chromium reduction using a fixed bed of scrap bearing iron spheres

Cited by 37 publications

References 9 publications

Hexavalent Chromium Reduction with Zero-Valent Iron (ZVI) in Aquatic Systems

Hexavalent Chromium Reduction with Zero-Valent Iron (ZVI) in Aquatic Systems

Commercial steel wool for reduction of hexavalent chromium in wastewater: batch kinetic studies and rate model

Decontamination of Hexavalent Chromium-Polluted Waters: Significance of Metallic Iron Technology

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