FIGUEIRÔA, J. A.; http://lattes.cnpq.br/6622788761431056; FIGUEIRÔA, Juliana Andreza.
Resumen:
The tannery industry is responsible for transforming the “green” skin into leather
through a tanning agent, usually the basic chromium sulfate. The disposal of
Cr3+ depending on abrasive conditions may oxidize it to Cr6+ being in this oxidizing
state, a carcinogenic and mutagenic metal for living organisms. In this study it had
been used concepts of CP regarding the development of ideas to treat solid waste of
“wet-blue” and the total effluent of tannery. In order to promote the extraction of
Cr3+ from “wet-blue” leather residues
produced, an unprecedented route of decolorization was elaborated using low cost
inputs with three distinct time reactions, 8, 12 and 18 hours. The efficiency of the
process was evaluated by determining the Cr2O3 content from the “wet-blue” leather
and from the produced residue after dechromating, collagen. The latter was further
characterized according to spectroscopic and thermogravimetric methods. For the
total effluent treatment it was used forage cactus (Opuntia ssp) as a biosorbent to
reduce the Cr3+ from the total effluent. Therefore, two systems of adsorption were
studied, with different masses of cactus powder in a set period of time under
disturbance and volume of effluents. The results indicated a reduction in the
Cr2O3 content from 81,03%, 94,82% and 95,99% within 8, 12 and 18 hours,
respectively. The most satisfactory results for reducing the Cr3+ content of the total
effluent happened within 5 minutes of contact. Obtaining for the tests with 2,0g and
4,0g of biomass a reduction of 74,80% and 84,88%. The tests showed that the
cactus can be used to reduce the content of Cr3+ from the total effluent.
