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Potential danger of chromium tanned wastes

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dc.title Potential danger of chromium tanned wastes en
dc.contributor.author Kolomazník, Karel
dc.contributor.author Adámek, Milan
dc.contributor.author Uhlířová, Michaela
dc.relation.ispartof HTE'07: Proceedings of the 5th IASME / WSEAS International Conference on Heat Transfer, Thermal Engineering and Environment
dc.identifier.isbn 978-960-6766-00-8
dc.date.issued 2007
dc.citation.spage 136
dc.citation.epage 140
dc.event.title 5th IASME/WSEAS International Conference on Heat Transfer, Thermal Engineering and Environment
dc.event.location Vouliagmeni
utb.event.state-en Greece
utb.event.state-cs Řecko
dc.event.sdate 2008-08-25
dc.event.edate 2008-08-27
dc.type conferenceObject
dc.language.iso en
dc.publisher World Scientific and Engineering Academy and Society (WSEAS) en
dc.relation.uri http://www.wseas.us/e-library/conferences/2007athensmech/papers/565-187.pdf
dc.subject chrome-tanned waste en
dc.subject hexavalent chromium en
dc.subject chromium recycling en
dc.subject enzymatic hydrolysis en
dc.subject hybrid hydrolysis en
dc.description.abstract This contribution deals with the waste from the processes in which raw hide is transformed into leather, as well as with the waste generated during further leather processing and the final waste of leather industry, the worn-out shoes. All this waste, if deposited in the open-air dumps, represents a potential threat to human health, because it contains trivalent chromium (Cr III), which can oxidise to its hexavalent form (Cr VI) under various conditions. The authors discuss the possibilities of spontaneous transformation of Cr III into Cr VI and propose several technologies of the waste treatment to eliminate the health and environmental risks. Chrome-tanned waste, especially the chrome shavings, is processed with the use of modified enzymatic hydrolysis. The chromium cake obtained after filtration has proved to serve as a suitable precipitator of chromium ions from chromium containing spent liquor. Simultaneously, the chromium cake is enriched by those chromium ions and can be re-used in the tanning process. The method has been successfully tested in pilot and industrial scale. It enables us to possess the total control of solid and liquid chrome-tanned waste, which has shown a new approach towards the issue of chromium recycling in the tanning industry. A two-step technology has been proposed for processing leather scraps, for which it is not possible to apply the same method as in the case of chrome shavings. One of the products of this technology is a protein hydrolysate containing a high portion of nitrogen, phosphorus and potassium. This hydrolysate has been already successfully used as a good-quality NPK fertilizer in agriculture. The authors also warn against the classic ways of worn-out shoes treatment, i.e. disposal in the open-air dumps or combustion, which leads to potentially dangerous products. The separate collection of worn-out shoes is recommended and it is assumed that the hybrid hydrolysis technology used for leather scraps could be also successful at solving the problem of old shoes. en
utb.faculty Faculty of Applied Informatics
dc.identifier.uri http://hdl.handle.net/10563/1001925
utb.identifier.obdid 43865793
utb.identifier.wok 000258476700022
utb.source d-wok
dc.date.accessioned 2011-08-09T07:34:14Z
dc.date.available 2011-08-09T07:34:14Z
utb.contributor.internalauthor Kolomazník, Karel
utb.contributor.internalauthor Adámek, Milan
utb.contributor.internalauthor Uhlířová, Michaela
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