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首页> 外文期刊>Environmental Science & Technology >Silicate enhanced enzymatic dehairing: A new lime-sulfide-free process for cowhides
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Silicate enhanced enzymatic dehairing: A new lime-sulfide-free process for cowhides

机译：硅酸盐增强的酶促脱毛：一种新的无石灰硫化牛皮工艺

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摘要

A conventional dehairing process with sodium sulfide and lime is a major source of the pollution from the tanning industry. In other words, conventional dehairing processes degrade the hair to the extent that it cannot be recovered; thus, these processes become a major contributor to wastewater pollution. In this study, an attempt has been made to develop a lime and sulfide-free dehairing process using a commercial enzyme formulation with the activation of a silicate salt. A dip and pile method of application has been standardized. The amount of enzyme and sodium metasilicate has also been optimized based on complete removal of hair. Enhancement of enzyme activity by the addition of silicate has been demonstrated through activity measurements. Hair removal is found to be complete using scanning electron microscope analysis. Strength and bulk properties of the experimental leathers are comparable to that of control leathers. The process enjoys a significant reduction in chemical oxygen demand (COD) and total solids (TS) by 53 and 26%, respectively. More importantly, the application of enzyme for dehairing results in an 8% area increase in the final leather. Also, the process is proven to be tech no-economic ally feasible.
机译：制革工业污染的主要来源是使用硫化钠和石灰的常规脱毛工艺。换句话说，常规的脱毛过程会使头发退化到无法恢复的程度。因此，这些过程成为造成废水污染的主要因素。在这项研究中，已经尝试开发一种使用工业化酶制剂并活化硅酸盐的无石灰和硫化物的脱毛方法。浸入和堆放方法已经标准化。基于完全脱毛，还优化了酶和偏硅酸钠的用量。通过活性测量已证明通过添加硅酸盐来增强酶活性。使用扫描电子显微镜分析发现脱毛已完成。实验皮革的强度和膨松性能与对照皮革相当。该工艺的化学需氧量（COD）和总固体（TS）分别降低了53％和26％。更重要的是，将酶用于脱毛的应用使最终皮革的面积增加了8％。而且，该过程被证明是技术上不经济可行的。

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