Chromium recovery from solid leather waste by chemical treatment and optimisation by response surface methodology

Beltrán-Prieto, Juan Carlos; Veloz-Rodríguez, Rafael; Pérez-Pérez, M. C.; Navarrete-Bolaños, J.L.; Vázquez-Nava, E.; Jiménez‐Islas, H.; Botello-Álvarez, José Enrique

doi:10.1080/02757540.2011.628016

Cited by 18 publications

(12 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Overall, when using H 2 SO 4 as leaching agent/solvent for 100 min leaching time at 60°C and pH 1.0, the leaching percentage of Cr can be increased up to 97%. H 2 SO 4 is the most commonly used leaching solvent for Cr leaching, due to the high Cr recovery, as well as its relatively low cost (Beltrán-Prieto et al, 2012;El-Shafey et al, 2005;Habashi, 1993), while Cr(OH) 3 has low solubility in HCl (i.e. 0.2% in 5% HCl) according to the literature (Vogel et al, 2014).…”

Section: Cr Recovery From Cr-rich Tannery Wastementioning

confidence: 99%

Chromium recovery from tannery sludge and its ash, based on hydrometallurgical methods

Pantazopoulou

Zouboulis

2019

Waste Manag Res

View full text Add to dashboard Cite

The recovery of chromium from tannery sludge and from its respective ash constitutes an alternative process of tannery sludge treatment in order to ensure safe disposal. Chromium recovery was investigated based on simple hydrometallurgical processes, that is, leaching using aqueous solutions of acids. Leaching was applied either directly to air-dried sludge or to its respective ash, which results from thermal treatment of the air-dried sludge under anoxic conditions. The major parameters that influence the effectiveness of the leaching process were investigated to optimize chromium leaching. Specifically, contact time, pH value, temperature, liquid per solid ratio, and leaching agent (H2SO4 or HCl) were tested. Leached chromium, obtained directly from the initial tannery waste after 100 min leaching with H2SO4 at pH 1 and at 60°C, was used for the trivalent chromium precipitation by adding magnesia, calcium hydroxide, and sodium hydroxide as precipitation agents. The results revealed satisfactory leaching of trivalent chromium directly from the air-dried sludge. The chromium content in the solid precipitated using sodium hydroxide was about 59 wt %. In contrast, chromium was difficult to leach from the respective ash.

show abstract

Section: Cr Recovery From Cr-rich Tannery Wastementioning

confidence: 99%

Chromium recovery from tannery sludge and its ash, based on hydrometallurgical methods

Pantazopoulou

Zouboulis

2019

Waste Manag Res

View full text Add to dashboard Cite

show abstract

“…11 Whatman filter paper. According to Beltrán-Prieto et al (2012), the recovered chromium was acidified with sulfuric acid then treated with sodium sulphite or sugar in order to obtain BCS solution, which can be used for leather tanning. During the reaction, the color of the liquor changed gradually from orange to green and finally to bluish green indicating the completion of the reduction (Fig.…”

Section: Extraction Yieldmentioning

confidence: 99%

“…In literature, incineration and chemical treatments are the most common methods for CSW treatment. Incineration has been considered as a means for reducing waste volume and provide energy recovery from the combustion of the organic material, while chemical treatment includes extraction of chromium to be reused in the tanning process and isolation of protein fractions (Kantarli and Yanik, 2010;Beltrán-Prieto et al, 2012 andPutshaka et al, 2015). Alkaline such as caustic soda or sodium carbonate are usually more effective than acids in chemical hydrolysis for CSW (Mohamed et al, 2013 andSutyasmi andSupraptiningsih, 2014).…”

mentioning

confidence: 99%

Treating Leather Shaving Waste to Decrease Its Environmental Impact

Nasr

Gaber

Ali

et al. 2018

Egyptian Journal of Desert Research

View full text Add to dashboard Cite

hrome shaving waste (CSW) is one of the largest leather tanning wastes, caused an economical and environmental loss if it did not utilize properly. This study aims to extract chromium from chrome shaving waste, by alkaline hydrolysis or incineration in order to reuse it in leather tanning. Sodium hydroxide and carbonate were used in chemical hydrolysis and compared with incineration method in chrome yielding. Twenty five sheep pelts were tanned with recovered and commercial chromium 33% basicity to compare their effects in tanning. The results showed that among alkaline treatments, caustic soda was more effective than sodium carbonate in extraction, but incineration method was the best extraction method because of its high extraction yield (99.37%). Using sugar as a reducing agent was better than sodium sulphite to prepare tanning liquor. It increased chrome yield and produced chromium sulphate 33% basicity, which are more suitable for leather tanning. Most physical and chemical properties, except fat and ash contents, were similar in leathers tanned with recovered chrome and those tanned with commercial chrome. Thus, all studied tanned leathers were suitable for using in leather manufacturing.

show abstract

“…The production of one ton of rawhide yields an average 250 kg of tanned leather, 250 kg tanned leather waste, 250 kg of untanned waste, besides almost 60,000 kg of waste water. The skin trimmings, keratin, fleshing, chrome shaving and buffing wastes are the generated solid wastes in leather production process in where protein is the principal constituent of all wastes [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Biodegradable package films of poly(L-Lactic) acid/extracted gelatin blend from white leather fibers

El-Sayed¹,

Ibrahim

2020

Egypt. J. Chem.

View full text Add to dashboard Cite

I N food packaging area, the substantial utilization of synthetic plastics has a huge environmental impact and there is necessitate really for more biodegradable packaging materials. Blending of poly (lactic acid) (PLA) and extracted gelatin (EG) was investigated as prospective replacements for non-degradable petrochemical polymers. EG is a biopolymer extracted from white leather fibers wastes in the leather industry after alkaline hydrolysis. Both polymers need modification for food packaging requirements. PLA films are very brittle and gelatin is sensitive to water and the properties of its films are reliant on the moisture content with low mechanical strength. An investigation on the blending of PLA and EG films gives better properties more suitable for packaging depending on their paired characteristics. The resulting biodegradable films were characterized using by FTIR, SEM, TGA/DTA, and simulated soil burial respirometric testing. The properties of some characteristics of PLA and EG blends in terms of mechanical and thermal properties have been discussed as biodegradable packaging films. It was found that the addition of 30 wt % of EG offering blended films with good thermal processability, transparency and flexibility, as well as films with good mechanical.

show abstract

Chromium recovery from solid leather waste by chemical treatment and optimisation by response surface methodology

Cited by 18 publications

References 34 publications

Chromium recovery from tannery sludge and its ash, based on hydrometallurgical methods

Chromium recovery from tannery sludge and its ash, based on hydrometallurgical methods

Treating Leather Shaving Waste to Decrease Its Environmental Impact

Biodegradable package films of poly(L-Lactic) acid/extracted gelatin blend from white leather fibers

Contact Info

Product

Resources

About