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231224s2017 xx |||||o 00| ||eng c |
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|a 10.1177/0734242X16680728
|2 doi
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|a eng
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1 |
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|a Kocurek, P
|e verfasserin
|4 aut
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|a Total control of chromium in tanneries - thermal decomposition of filtration cake from enzymatic hydrolysis of chrome shavings
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|c 2017
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|a Text
|b txt
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|a ƒaComputermedien
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|a Date Completed 14.07.2017
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|a Date Revised 14.07.2017
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a This paper deals with the problem of chromium recovery from chrome-tanned waste and thus with reducing the environmental impact of the leather industry. Chrome-tanned waste was transformed by alkaline enzymatic hydrolysis promoted by magnesium oxide into practically chromium-free, commercially applicable collagen hydrolysate and filtration cake containing a high portion of chromium. The crude and magnesium-deprived chromium cakes were subjected to a process of thermal decomposition at 650°C under oxygen-free conditions to reduce the amount of this waste and to study the effect of magnesium removal on the resulting products. Oxygen-free conditions were applied in order to prevent the oxidation of trivalent chromium into the hazardous hexavalent form. Thermal decomposition products from both crude and magnesium-deprived chrome cakes were characterized by high chromium content over 50%, which occurred as eskolaite (Cr2O3) and magnesiochromite (MgCr2O4) crystal phases, respectively. Thermal decomposition decreased the amount of chrome cake dry feed by 90%. Based on the performed experiments, a scheme for the total control of chromium in the leather industry was designed
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|a Journal Article
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|a Leather waste
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|a alkaline enzymatic hydrolysis
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|a chrome shavings
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|a chromium filtration cake
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|a chromium recycling
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|a thermal decomposition
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|a Industrial Waste
|2 NLM
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|a Chromium
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|a Kolomazník, K
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|a Bařinová, M
|e verfasserin
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|a Hendrych, J
|e verfasserin
|4 aut
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|i Enthalten in
|t Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA
|d 1991
|g 35(2017), 4 vom: 08. Apr., Seite 444-449
|w (DE-627)NLM098164791
|x 1096-3669
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|g volume:35
|g year:2017
|g number:4
|g day:08
|g month:04
|g pages:444-449
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