Leather making bio-pretreatment method

Abstract

The invention discloses a leather making bio-pretreatment method. By using a biotechnology to replace or partly replace a chemical method and utilizing compound enzyme preparations including lipase and protease, the method strengthens processes of soaking and degreasing, accelerates dispersion of collagen fibers, optimizes the enzyme bating process, shortens the treatment time and reduces the consumption of water and the use of a chemical additive. Compared with the traditional leather-making technology, the leather making bio-pretreatment method can accelerate the soaking process and the fiber dispersion process, shorten the process time by 6-12h, realize water saving by about 30 percent and COD (Chemical Oxygen Demand) emission reduction by 20-40 percent, lower the dosage of protosulphide by 40-50 percent and the like. In the invention, on the basis of lowering the consumption of the protosulphide by using a hair-saving method, an environmental friendly auxiliary liming agent which is prepared by utilizing the biotechnology and a physicochemistry principle can completely consume residual sulfide in waste liquid to enable unhairing waste liquid and limed pelts not to contain the sulfide and completely eliminate pollution of the sulfide; therefore, the invention has the advantages of simple operation and low cost without influencing the product quality. In addition, in the whole pretreatment process, the biological enzyme preparation is considered to be utilized to efficiently and harmlessly remove components on animal skin unrelated to leather making.

Description

technical field [0001] The invention relates to a tanning treatment technology. Specifically, it relates to a biological pretreatment technology for tanning. Background technique [0002] Leather industry is a heavy polluting industry. In the process of tanning chemical industry, on the one hand, the useless protein components (hair, fat, fibrous interstitial, etc.) on the animal skin are removed, and a large amount of COD and BOD are produced. 5 On the other hand, poisonous and harmful chemical substances are used, and a large amount of chemical materials are not fully absorbed and utilized in the manufacturing process, and enter the waste water, bringing new pollution. If these two problems cannot be effectively solved, especially the environmental pollution problem, it will become an important factor seriously restricting the sustainable development of my country's leather industry, and even face closure and shrinkage in the near future. Therefore, while striving to im...

AI Technical Summary

Problems solved by technology

[0003] In the pre-tanning treatment section, not only consumes a lot of water, but also discharges a large amount of organic pollutants and some toxic and harmful substances, causing serious harm to the ecological environment

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