Extraction of heavy metals from galvanic sludges

Buzaeva, M. V.; Zaval’tseva, O. A.; Davydova, O. A.; Dubrovina, V. V.; Klimov, E. S.

doi:10.1134/s1070427211040306

Cited by 7 publications

(8 citation statements)

References 1 publication

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“…46 In the present study, the order of effectiveness of extraction by EDTA was Zn > Cu > Ni > Cr ≥ Fe, with the high removal efficiency of Zn and Cu possibly due to their strong complexing tendency with EDTA. As stated by Buzaeva et al 41 , for the majority of ligands, the stability of metal complexes decreases in the sequence Cu > Ni > Zn > Cr, which tends to agree with our results. Also, Gong etal.…”

Section: Extraction With Organic Acids Molasses Hydrolysatesupporting

confidence: 94%

“…Thus zinc had the highest removal, while iron and chromium were the most difficult metals to extract with EDTA. These results compare with previous studies of Buzaeva et al 41 who also reported the lowest EDTA removal for chromium.…”

Section: Metal Content Of the Sludgesupporting

confidence: 89%

“…Molecules of EDTA contain both acidic and basic centers. The EDTA acts as a polydentate ligand which can act as a strong chelator . Complexing agents (complexons) such as EDTA form stable chelated metal complexes with covalent and coordination bonds between a ligand (L) and a central metal cation in a wide pH range (Equation ):

L + {normalM}^{n+} \leftrightarrow L n M

…”

Section: Resultsmentioning

confidence: 99%

“…When a complexing agent is added into the medium the acidity increases, favoring the presence of free ions in solution …”

Section: Resultsmentioning

confidence: 99%

“…When a complexing agent is added into the medium the acidity increases, favoring the presence of free ions in solution. 41 The amino-group and acetoxyl in EDTA's molecular structure have the ability to complex the metal cation to form stable and soluble metal-chelated sprecies. 46 The removal of heavy metals from galvanic sludge by EDTA extraction can be described by the wileyonlinelibrary.com/jctb equation: 4,40,46 Galvanic sludge − Me n+ + EDTA → Galvanic sludge + EDTA − Me n+ (5) Theoretically, as EDTA is a potentially hexadentate ligand one mole can form a complex with one mole of heavy metal.…”

Section: Extraction With Organic Acids Molasses Hydrolysatementioning

confidence: 99%

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Comparative metal (Cu, Ni, Zn, total Cr, and Fe) removal from galvanic sludge by molasses hydrolysate

Özbaş

Gökçe

Güneysu

et al. 2013

J of Chemical Tech & Biotech

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BACKGROUND The objective of this study was to evaluate the chemical extraction efficiency of five metals (Cu, Ni, Zn, total Cr, and Fe) from galvanic sludge using molasses hydrolysate produced from molasses, a by‐product of the sugar industry. The study was also aimed to compare the extraction efficiency of the molasses hydrolysate with those of nitric acid and EDTA. RESULTS The experimental results showed that the metal removal (%) increased with extracting solution concentration, but decreased with increasing solid:liquid (S:L) ratio. The highest removal efficiencies using molasses hydrolysate were: Cu 90%; Ni 100%; Zn 90%; total Cr 100%, and Fe 81% at 10 min extracting time and S:L = 1:10 g mL−1. CONCLUSION Molasses hydrolysate was found to be more effective than nitric acid and EDTA in the extraction of metals from the sludge. It was concluded that although using HNO3 was more economical than Na2EDTA and molasses hydrolysate, using molasses hydrolysate which is a novel, environmentally friendly, biodegradable extracting agent would be appropriate to prevent secondary pollution. © 2013 Society of Chemical Industry

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Section: Extraction With Organic Acids Molasses Hydrolysatesupporting

confidence: 94%

Section: Metal Content Of the Sludgesupporting

confidence: 89%

L + {normalM}^{n+} \leftrightarrow L n M

…”

Section: Resultsmentioning

confidence: 99%

“…When a complexing agent is added into the medium the acidity increases, favoring the presence of free ions in solution …”

Section: Resultsmentioning

confidence: 99%

Section: Extraction With Organic Acids Molasses Hydrolysatementioning

confidence: 99%

See 3 more Smart Citations

Comparative metal (Cu, Ni, Zn, total Cr, and Fe) removal from galvanic sludge by molasses hydrolysate

Özbaş

Gökçe

Güneysu

et al. 2013

J of Chemical Tech & Biotech

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Valorization and inertization of galvanic sludge waste in clay bricks

Pérez‐Villarejo

Martínez‐Martínez

Carrasco-Hurtado

et al. 2015

Applied Clay Science

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Galvanic sludge wastes (GSW) are produced by the physico-chemical treatments of wastewater generated by electroplating plants. These materials have a significant potential for the production of clay ceramic bricks. This paper focuses on the viability of the inertization of heavy metals from GSW mixed with clays. The original materials *Revised manuscript with no changes marked Click here to view linked References were obtained by mixing three types of raw clay (red, yellow and black) in equal parts with GSW. These mixtures were characterized by XRD, XRF, and chemical elemental analysis CHNS. The dosage of GSW in the Clay-GSW bricks was up to 5 wt%. The bricks were then manufactured using conventional processes. The influence of the amount of GSW was evaluated after firing the clay-GSW composites at 950ºC for 1 hour. The engineering properties of the fired samples, such as density, water absorption, open porosity, water suction and compressive strength, with and without the GSW, were determined. The incorporation of GSW into the clay mix clearly decreased the linear shrinkage and bulk density of the bricks in comparison with the fired clay used as a control. These GSW-clay composites also showed lower open porosity. According to the results obtained for the bulk density of the bricks, samples with GSW addition showed slightly lower values of open porosity than clay bodies, indicating that the GSW-clay samples had slightly higher closed porosity values. This was also shown by SEM. The open porosity, SEM and pore size distribution tests indicated that the porosity generated by the addition of GSW was mainly closed and, therefore, GSW bricks had excellent mechanical properties. The environmental risks of the incorporation of GSW, rich in heavy metals (Cr, Zn, Ni and others), to a clay matrix was evaluated by leaching tests of the fired products. The results indicated a successful inertization of the pollutants.

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