Selective recovery of metals in leachate from chromated copper arsenate treated wastes using electrochemical technology and chemical precipitation

Janin, Amélie; Zaviska, François; Drogui, Patrick; Blais, Jean‐François; Mercier, Guy

doi:10.1016/j.hydromet.2008.12.002

Cited by 86 publications

(34 citation statements)

References 27 publications

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“…Este método simples e normalmente barato é fácil de ser instalado em plantas de tratamento e sua operação é direta. A precipitação/coagulação permite a eliminação de sólidos em suspensão, matéria orgânica e muitos outros contaminantes (Janin et al, 2009). Como muitos metais formam sais insolúveis quando reagem com hidróxido, sulfeto ou carbonato, a técnica de precipitação é o método mais simples empregado para tratamento de efluentes, quando o objetivo é a remoção de metais (Kramer & Allen, 1988).…”

Section: El-shahabyunclassified

Toxicity Bioassay Validation as a Support for Monitoring Effluent Discharge

Sousa¹,

Padula

Silva

et al. 2013

Ecotoxicol. Environ. Contam.

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Toxicity Bioassay Validation as a Support for Monitoring Effluent Discharge -The present work aimed evaluating the impact of precipitation with sodium hydroxide and sodium sulfide, that clearly reduce the chemical contaminants of the effluent, leading to toxicity reduction. Metal analysis by ICP/AES (Inductively Coupled Plasma/Atomic Emission Spectroscopy), physicochemical analysis (pH) and toxicological analysis (by measuring the production of micronuclei in Allium cepa) were performed in the effluent studied before and after the precipitation. The analysis before treatment showed the extreme acidity of the effluent (pH<1,0), metals above the acceptable level for discharging according to the standards (especially zinc and iron) and significant mutagenicity. After precipitation with sodium sulfide, there was enough reduction in metals concentration to allow the effluent discharging within the limits specified by Conama Resolutions 357/2005 and 430/2011, and with both precipitants the discharging was possible according to the limits specified by 8468/76 Decree (São Paulo State/Brazil) (for the elements studied). There was also significant reduction in mutagenicity after treatment. The use of mutagenicity bioassay with A. cepa as a supplementary protocol to the ones already recommended for effluent analysis is emphasized in the present work.

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Section: El-shahabyunclassified

Toxicity Bioassay Validation as a Support for Monitoring Effluent Discharge

Sousa¹,

Padula

Silva

et al. 2013

Ecotoxicol. Environ. Contam.

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“…Among the 11 chemical decontamination processes developed, the solubilization 12 of As, Cr, Cu, PCP and DF using alkaline solutions and a bio- 13 surfactant seemed to be very promising in terms of contaminant 14 removal efficiencies and operational costs. Indeed, Reynier et al [6] 15 highlighted that more than 60% of As, 32% of Cr, 77% of Cu and 87% 16 of PCP can be removed from contaminated soils after 3 leaching 17 steps of 2 h each carried out at 80 C with a pulp density fixed at 18 10% in the presence of sodium hydroxide (0.5 M) and a surfactant 19 ([BW] = 2%).…”

Section: Introductionmentioning

confidence: 99%

“…Chemical coagulation allows the efficient 40 treatment of wastewater polluted by metals as well as organic 41 compounds, such as PCP. Several studies on the treatment of 42 effluents contaminated with Cu, Cr, and As have shown that this 43 technology has good potential for the recovery of these metals 44 [13,14]. In most cases, the precipitation of metals is performed in 45 the presence of alkaline agents (Ca(OH) 2 , Mg(OH) 2 and NaOH) to 46 form metal hydroxides.…”

Section: Introductionmentioning

confidence: 99%

Treatment of contaminated soil leachate by precipitation, adsorption and ion exchange

Reynier

Coudert

Blais

et al. 2015

Journal of Environmental Chemical Engineering

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“…There are several methods for their separation and recovery, some of them using a combination of various techniques, such as membrane processes, electrolysis or precipitation, to recover metal ions in the metallic state or as oxides or hydroxides, with the possibility of being reused later, thereby recovering their market value [3,4]. The application of electrochemical techniques in the environmental remediation is increasing because, besides being very versatile, they can be applied in the removal of polluting solids, liquids and gases.…”

Section: Introductionmentioning

confidence: 99%

Metal Recovery from Aqueous Solutions

Ascensão

Ciríaco

Lopes

2011

Port. Electrochim. Acta

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Metal recovery by reduction of metal ions present in model solutions, containing one or more heavy metals, was performed. To prepare the model solutions, sulfates and/or chlorides of Cu(II), Cd(II), Pb(II) and Zn(II) were used, at pH 3.5. Assays were run in a one or two compartments cell, at different applied potentials, using a steel plate as cathode, a platinum plate as anode and an Ag/AgCl, KClsat as reference electrode. The metal recovery yield was determined by atomic absorption spectroscopy. The phases corresponding to the metallic deposits were identified by X-ray diffraction. For the solutions containing just one metal ion, the best metal recoveries and the corresponding applied potentials, obtained in a one cell compartment, were the following: Cu 2+ 99% at E = -100 mV; Pb 2+ 99% at E = -800 mV; Cd 2+ 93% at E = -900 mV; and Zn 2+38% at E = -1300 mV. The metal removals from the mixed solution of four heavy metals, after 4 consecutive chronoamperometries, performed in a one compartment cell, at the best applied potentials determined with the solutions containing only one metal ion, were the following: Cu

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Selective recovery of metals in leachate from chromated copper arsenate treated wastes using electrochemical technology and chemical precipitation

Cited by 86 publications

References 27 publications

Toxicity Bioassay Validation as a Support for Monitoring Effluent Discharge

Toxicity Bioassay Validation as a Support for Monitoring Effluent Discharge

Treatment of contaminated soil leachate by precipitation, adsorption and ion exchange

Metal Recovery from Aqueous Solutions

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