A bench study on chromium recovery from tannery sludge

Macchi, G.; Pagano, Michele; Pettine, M.; Santori, M.; Tiravanti, G.

doi:10.1016/0043-1354(91)90152-g

Cited by 72 publications

(37 citation statements)

References 13 publications

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“…However, projects that use segregated systems have reduced costs and better recovery of the contaminant. Recovery of chromium (Cr +6 , Cr +3 ) in industrial effluents has presented the advantages based on the philosophies of LCA aimed at environmental protection and indirectly reducing mining activities using waste-containing chromium [16][17][18].…”

Section: Resultsmentioning

confidence: 99%

Chromate and the Environment: Removal and Utilization of Industrial Waste

Mainier¹,

Leite²,

Reis³

et al. 2016

JCCE

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Chromate and dichromate sodium as a function of oxidizer characteristics are used in several industrial areas; for example, in surface protection of coated parts of cadmium, zinc and aluminum (chromate coated treated), corrosion inhibitors, the treatment of leather, the manufacture of pigments, etc. However, the use of such products has been questioned due to the problems of toxicity and pollution that can be caused in the environmental. The Brazilian environmental agency has established that the concentrations of chromate in water courses are less than 0.5 ppm. In order to reuse chromate (CrO 4 2-) from industrial effluent, laboratory experiments have been proposed based on chemical reduction or electrolytic processes, in order to transform these chromate ions in a final mix of oxides (in solid form), which can then be packed and sent to the production process of sodium chromate. The results of these experiments have become useful industrially (without regard to costs) considering the environmental reuse and the life cycle of the chemical compound.

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Section: Resultsmentioning

confidence: 99%

Chromate and the Environment: Removal and Utilization of Industrial Waste

Mainier¹,

Leite²,

Reis³

et al. 2016

JCCE

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“…Various technologies for chromium removal and control in industry wastewaters are based on precipitation and co-precipitation method coupled with pre-or post-oxidation, reduction or concentration (Rhyner et al 1995;SenGupta 1995). As opposed to precipitation method, which is "destructive" toward pollutant, "conservative" technologies allow for removal, recovery and recycling of persistent pollutants by various prepared resins, thus taking advantage of the economic revenue associated with the commercial value of the recycled products (Petruzzelli et al 1994;Macchi et al 1991). Chromium, recovered as chromate from the resin spent regeneration eluates could be ready for reuse in the plating industry or in the same tannery industry after reduction to Cr(III) (Jardine et al 1999).…”

Section: Chromium Wastementioning

confidence: 98%

Mixed silica and alumina hosted carboxylate oxide for removal of chromium species from wastewater

2007

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Increasing in the use of various chromium species over the past few decades has inevitably resulted in an increased flux of their metallic substances in aquatic life. Therefore, experimental work was developed to improve the physical and chemical characteristics of the prepared mesoporous SiO 2 -Al 2 O 3 mixed oxides via a sol-gel process. The effective key parameter on the properties of the materials was achieved by the addition of carboxylate functional group such as Alph-hydroxyl isobuteric acid (AHIBA) during the gelation process and prior the calcinations step. Better performance of these carboxylate resins are attributed to the complexing ability of the carboxylate groups toward polyvalent chromium species which is added to the normal sorption properties of the oxides. Urea has been used as a means of producing an aluminum precipitate that is easier to filter than that produced by rapid addition of base. Introduction of Al and Si salts together to form mixed oxide modified the way of their substitution in the hosting resin than when they were separately added. The data revealed that mesoporous materials with very narrow pore diameter distribution (micron-sized) and high surface area were obtained. The surface areas and pore size distributions were mainly depend on SiO 2 content. Systematic investigations were carried out on the set of the prepared mixed oxides with different porosity, cross-linking degree and exchange loading to find out the best sorbent for chromium removal. The final objective in all cases was aimed at determining feasible and economically reliable solution to the environmental problems related to the tannery industry.

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“…Within these, Macchi et al obtained 90% chromium recovery using concentrated H 2 SO 4 and a contact time of 24 h [18]. Taking these results as starting point, in the first experiments the contact time was kept at 24 h and the concentration of commercial hydrochloric acid (used instead of the more expensive sulfuric acid) was set at three different levels: 60, 80 and 100% (v/v).…”

Section: Sequential Experimental Design For the Chromic Sludgementioning

confidence: 99%

“…A 20 mL aliquot of the extract containing 2424.5 mg/L chromium was transferred to a 50 mL beaker and its pH was adjusted to 10 with NaOH, as indicated by the results obtained by [18,19]. The experiments were performed as specified by the level combinations given in Table 2.…”

Section: Procedures For Oxidizing Cr(iii) To Cr(vi)mentioning

confidence: 99%