An approach to cleaner production: from hair burning to hair saving using a lime-free unhairing system |
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| Authors: | Virgilijus Valeika K?stutis Bele?ka Violeta Valeikien? Vytautas Kolodzeiskis |
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| Institution: | 1. School of Biosciences and Technology, VIT, Vellore 632014, Tamilnadu, India;2. Tannery division, Council of Scientific and Industrial Research - Central Leather Research Institute, Chennai 600020, Tamilnadu, India;3. Formerly, Tannery division, Council of Scientific and Industrial Research - Central Leather Research Institute, Chennai 600020, Tamilnadu, India |
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| Abstract: | One of the methods to decrease the pollution of tanneries' wastewater is hair saving unhairing of hides. An investigation of proteolytic activity of enzymatic preparation (EP) has shown that some EPs have high stability in strong alkaline solutions and can be used for the hair saving process.Based on this investigation, a new hair saving unhairing method using a system containing EP, sodium hydroxide, sodium sulphide, and disodium hydrophosphate was developed. The method results in a high quality pelt suitable for leather manufacturing, decreases the pollution caused by sodium sulphide and the other products of hair degradation and avoids the pollution caused by calcium compounds. |
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