Enzyme treatment and recycling method for cellulosic fibers in waste textiles

Abstract

The invention relates to an enzyme treatment and recycling method for cellulosic fibers in waste textiles. The provided method aims to effectively realize the recycling of the cellulosic fibers in the waste textiles. According to the technical scheme provided by the invention, the enzyme treatment and recycling method for the cellulosic fibers in the waste textiles sequentially comprises the following steps: (1) qualitatively determining the variety of fibers in the waste textiles and the variety of dyes; (2) adding oxidordeuctase into dyed textiles which are directly treated by a direct dye, an active dye, an insoluble azo pigment or a cationic dye, and carrying out pre-treatment; (3) adding cellulase into the waste textiles treated by the step (2) and carrying out selective degradation on the cellulosic fibers; and (4) carrying out solid-liquid separation on a substance treated by the step (3); carrying out ultra-filtration separation on the cellulase in a degraded solution and reutilizing, wherein a degraded product is used for sugar fermentation to produce relative products; and physically recycling the residual solid textiles.

Description

technical field [0001] The invention belongs to the field of recycling and utilization of waste textiles, and in particular relates to the efficient recycling and utilization of cellulose fibers in waste textiles by using a cellulase treatment method. Background technique: [0002] China is a big country in the production and use of textiles in the world. According to statistics, the total amount of waste textiles produced in my country reached 26 million tons in 2011. However, the comprehensive utilization of waste textiles in my country is in its infancy, and the comprehensive utilization rate is less than 10%, most of which have not been recycled reasonably. The recycling of waste textiles can effectively alleviate the shortage of textile raw materials, significantly reduce carbon dioxide emissions and environmental pollution, and support the recycling of waste textiles has been clearly written into the "Twelfth Five-Year Plan" of China's textile industry, becoming a guid...

AI Technical Summary

Problems solved by technology

However, the comprehensive utilization of waste textiles in my country is in its infancy, and the comprehensive utilization rate is less than 10%, most of which have not been recycled reasonably.

At present, its recycling technology can be mainly divided into physical method, chemical method, incineration method and landfill method, etc., but the above methods all have some shortcomings; such as landfill method wastes a lot of land and cannot be recycled, and textiles are degraded in nature. Some harmful substances may be decomposed in the process, polluting the soil and groundwater sources; although the incineration method is simple and can recover heat energy, the dye auxiliaries will produce many toxic gases during the incineration process to pollute the environment; physical methods cannot separate dyes, and classify blended fibers Difficult, poor applicability, high technical requirements for recycling, difficult classification, many pre-treatment machines and equipment, high cost, and complicated recycling process; chemical methods use chemical reagents to dissolve cellulose fibers or degrade other fiber components to retain cellulose fiber, but this method cannot distinguish fiber components with similar solubility; when there are some reactive dyes, the fiber may not be completely recovered and dissolved, and various organic chemical solvents, acids, alkalis and other harmful chemicals are used, which is costly and easy cause environmental pollution