基于隶属度综合分析法从制革固废中回收羊毛纤维

Recovery of Wool Fiber from Tannery Solid Waste based on the Comprehensive Analysis of Membership Degree

为提高制革固废中毛纤维的利用价值,本实验将隶属度综合分析法与响应面优化法相结合,建立了酶法回收毛纤维的工艺。运用隶属度综合分析法对不同酶法回收的羊毛纤维白度、断裂强度、断裂伸长率和酶解液总蛋白、总糖含量进行赋权计算,以获得的综合评分S为响应值,运用响应面优化法对酶制剂配比进行优化,最终获得羊毛纤维的回收工艺。具体为:含毛制革固废80℃高温水浴1 h,冷却后浸入含有胶原酶2.5 g/L、胰蛋白酶2.5 g/L、菠萝蛋白酶5 g/L的溶液当中,以NaOH溶液调节pH至7.0,40℃酶解5 h,过滤洗涤,提取毛纤维。经测定提取的毛纤维白度61%,纤维断裂伸长率33%,较原毛均有所提升,纤维断裂强度1.08 cN/dteX,为原毛的96%。该研究为制革含毛固废的高值化利用提供了理论参考。

In order to improve the utilization value of wool fiber in tannery solid waste,this work combined the membership degree comprehensive analysis method with the response surface optimization method to establish the enzymatic recovery process of wool fiber.The membership degree comprehensive analysis method was used to calculate the whiteness,breaking strength,elongation at break,total protein and total sugar content of wool fiber recovered by different enzymatic methods.The comprehensive score S was used as the response value,and the response surface optimization method was used to optimize the ratio of enzyme preparation.Finally,the recovery process of wool fiber was obtained.Specifically,the wool-containing leather solid waste was immersed in a high-temperature water bath at 80℃for 1 h.After cooling,it was immersed in a solution containing 2.5 g/L collagenase,2.5 g/L trypsin,and 5 g/L bromelain.The pH was adjusted to 7.0 by using NaOH solution,and the enzymatic hydrolysis was performed at 40℃for 5 h.The whiteness of the extracted wool fiber was 61%,and the elongation at break of the fiber was 33%,which was higher than that of the raw wool.The breaking strength of the fiber was 1.08 cN/dteX,which was 96%of the raw wool.This study provides a theoretical reference for the high value research of leather wool solid waste.