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首页> 外文期刊>Journal of Solid Waste Technology and Management >SUSTAINABLE MANAGEMENT OF WASTE—REDUCTION OF THE CHROMIUM CONTENT OF TANNERY SOLID WASTE AS A STEP IN THE CLEANER PRODUCTION OF GELATIN
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SUSTAINABLE MANAGEMENT OF WASTE—REDUCTION OF THE CHROMIUM CONTENT OF TANNERY SOLID WASTE AS A STEP IN THE CLEANER PRODUCTION OF GELATIN

机译：废物的可持续管理—降低明胶清洁剂生产过程中制革固体废物中铬的含量

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摘要

Treatment of chrome shavings, a solid waste from the leather industry, by reducing its chromium content was investigated to determine whether it could be used in the production of high value-added products like gelatin. An oxidative dechroming process was used to remove the chromium from the shavings achieving a dechroming ratio of 96%. Thermal behaviour of chrome shavings with different chromium content was studied using DSC analysis, revealing that chromium is responsible for imparting stability to the collagen fibres. Gelatin, with different chemical and mechanical properties, was obtained by thermal and chemical hydrolysis of the collagen fibres using different alkaline hydrolytic agents, such as sodium hydroxide (NaOH) and ammonia (NH_3). The denaturation temperature (TD) of the gelatins was found to be 30℃ and 62℃ for NaOH and NH_3-derived gelatins, respectively. The effect of the chromium content on the physical and thermal properties of gelatin was also investigated, confirming the stabilising role of chromium in the fibres. Gelatin can be used in applications such as encapsulation, bind ing, adhesive production, film forming or finishing agent in the paper, wood, ink, textile and leather industries. Therefore, this treatment can add value by using a cleaner production pathway to a valuable product extracted from what was previously hazardous waste.
机译：研究了通过减少铬含量来处理皮革工业固体废料铬屑的方法，以确定其是否可用于生产明胶等高附加值产品。使用氧化脱铬工艺从刨花中去除铬，实现96％的脱铬率。使用DSC分析研究了不同铬含量的铬屑的热行为，结果表明铬负责赋予胶原纤维以稳定性。通过使用不同的碱性水解剂（例如氢氧化钠（NaOH）和氨水（NH_3））对胶原纤维进行热和化学水解，可以获得具有不同化学和机械性能的明胶。发现由NaOH和NH_3衍生的明胶的明胶的变性温度（TD）分别为30℃和62℃。还研究了铬含量对明胶的物理和热学性质的影响，证实了铬在纤维中的稳定作用。明胶可用于造纸，木材，油墨，纺织和皮革工业中的应用，例如封装，粘合，粘合剂生产，成膜剂或涂饰剂。因此，这种处理可以通过使用更清洁的生产途径来增加从以前有害废物中提取的有价值产品的价值。

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