Value added eco-friendly products from tannery solid wastes.

T P Sastry; R K Sehgal; T Ramasami

Home/Archive/PubMed

PubMed · 17051910

Value added eco-friendly products from tannery solid wastes.

T P Sastry·R K Sehgal·T Ramasami

View original source ↗Export metadata ↓

Abstract

Chrome shavings are the prominent solid wastes in tanning industry. Since chromium is known for its toxicity, the disposal of chrome shavings has been identified as a serious problem from the environmental point of view. At present, the popular utilization mode for chrome shavings is the manufacture of leather boards and related products. But this does not offer complete utilization of chrome shavings. Moreover, return per ton of chrome shavings is low if used for leather board production. In view of this, two processes have been developed to offer an alternative and better solution for the disposal of chrome shavings. The first process is preparation of parchment like membrane and the second process is related to development of leather like material. These products are analyzed for their mechanical behavior and other physicochemical properties. Parchment membrane can be used in the preparation of lampshades, chandeliers, wall hangers, table tops etc. and leather like material can be used in the preparation of chappal uppers, hand bags, purses, valets etc. The utilization of the chrome shavings in preparation of those two products not only reduces the environmental pollution but at the same time value added products can also be obtained.

Explore related subjects

Chromium Compounds Conservation of Natural Resources Environmental Pollution Industrial Waste Manufactured Materials Refuse Disposal Tanning Journal Article

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

T P Sastry, R K Sehgal, T Ramasami. 2005. Value added eco-friendly products from tannery solid wastes.. https://pubmed.ncbi.nlm.nih.gov/17051910/

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2006

Ettringite-induced heave in chromite ore processing residue (COPR) upon ferrous sulfate treatment.

A pilot-scale treatment study was implemented at a deposition site of chromite ore processing residue (COPR) in New Jersey. Ferrous sulfate heptahydrate (FeSO4 x 7H2O) was employed to reduce hexavalent chromium in two dosages with three types of soil mixing equipment. XANES analyses of treated samples cured for 240 days indicated that all treatment combinations failed to meet the Cr(VI) regulatory limit of 240 mg/kg. More importantly, the discrepancy between XANES and alkaline digestion results renders the latter unreliable for regulatory purposes when applied to ferrous-treated COPR. Regardless of Cr-(VI), the introduction of reductant containing sulfate, mechanical mixing, water, acidity, and the resulting temperature increase in treated COPR promoted dissolution of brownmillerite (Ca2FeAlO5), releasing alumina and alkalinity. The pH increase caused initially precipitated gypsum (CaSO4 x 2H2O) to progressively convert to ettringite (Ca6Al2(SO4)3 x 32H2O) and its associated volume expansion under both in situ and ex situ conditions, with a maximum of 0.8 m vertical swell within 40 days of curing. While Cr-(VI) treatment remains a challenge, the intentional exhaustion of the heave potential of COPR by transforming all Al sources to ettringite emerges as a possible solution to delayed ettringite formation, which would hamper site redevelopment.

Chromium Compounds↗

PubMed2006

C4' sugar oxidation of deoxyribonucleotide triphosphates by chromium(V) complexes.

The Cr(V) complexes, bis(2-ethyl-2-hydroxybutyrato)oxochromate(V) ([OCr(V)(ehba)(2)](-)) and (2,2-bis(hydroxymethyl)-2-(bis(2-hydroxyethyl)amino)ethanolato)oxochromate(V) ([OCr(V)(BT)](2-)), were reacted with a series of deoxyribonucleotide triphosphates. Oxidation of deoxyribose at C4' was observed by measuring the amount of thiobarbituric acid reactive species (TBARS) produced in these reactions. For both compounds, the TBARS obtained with purine nucleotides was between 2.25 and 3.5 times greater than what was observed with pyrimidine nucleotide. This result suggests that the identity of the nucleic acid base can influence the hydrogen atom abstraction at C4'. Overall, the amount of product obtained with [OCr(V)(BT)](2-) was significantly less than what was observed with [OCr(V)(ehba)(2)](-), indicating that these two Cr(V) model complexes may oxidize DNA differently.

Chromium Compounds↗

PubMed2006

New route to the synthesis of bis[N-(2-aminoethyl) salicylaldiminato] chromium(III) chloride monohydrate Spectroscopic characterization, crystal structure and interaction with DNA.

The reaction of [Cr(urea)(6)]Cl(3).3H(2)O with H(2)salen (H(2)salen=N,N(')-ethylenebis(salicylaldimine) in water-methanol mixture (40:60v/v) under reflux yielded the complex bis[N-(2-aminoethyl)salicylaldiminato]chromium(III) chloride monohydrate, [Cr(aesaldmn)(2)]Cl.H(2)O. The complex was characterized by elemental analysis, molar conductance, magnetic susceptibility, spectroscopic (UV-vis and IR) data and X-ray diffraction studies. The new ligand, N-(2-aminoethyl)salicylaldimine, Haesaldmn, possibly resulted from the hydrolytic cleavage of one end of the H(2)salen ligand during reflux. Binding of this chromium(III) complex to CT DNA has been studied using UV-vis spectroscopy with an apparent binding constant of 2.68 x 10(3)M(-1). It shows that the binding mode is electrostatic while the emission of ethidium bromide to CT DNA in the absence and in the presence of the complex show that it binds DNA with partial intercalation.

Chromium Compounds↗