【摘要】 为对牦牛皮酶碱结合脱毛法产生的废液进行循环利用,通过分析其中的硫化钠和石灰含量,补加相关化工材料即可进行循环利用;每次循环后测定废液的COD值和蛋白质,并对浸灰裸皮膨胀率以及纤维分散情况进行了表征,以评价废液循环对裸皮膨胀的影响;将所得裸皮制成革坯,并对其力学性能和感官性能进行了测定,以评价废液循环对成革性能的影响。实验结果表明,浸灰废液循环11次,可以节约硫化钠41.23%、石灰46.16%、水70.00%。当循环次数超过9次时,废液中蛋白质含量和COD值趋于稳定,但是浸灰裸皮的膨胀率和纤维分散程度有所降低,毛根难以完全除尽,革坯力学性能和粒面洁净度下降。综上所述,牦牛皮酶碱结合脱毛法的脱毛浸灰废液可以循环利用,且最佳循环次数为9次。更多还原

【Abstract】 For recycling the enzyme-alkali unhairing method in yak leather making process, sodium sulfide and lime were replenished during the effluent recycling based on analysis data. The COD value and protein content in every recycling effluent were tested, and the swelling rate together with fiber opening of limed pelts were also measured to evaluate the influence of recycling process on liming effect. At last, the mechanical and organoleptic properties were tested when the pelts were converted into crust to clarify whether effluent recycling affected leather properties. The results showed that41.23% sodium sulfide, 46.16% lime and 70.00% water were saved during 11 times recycling. The COD and protein content in effluent trended to stable after 9 times recycling, but the swelling rate and fiber opening decreased, and some hair roots remained after liming. In addition, the mechanical properties and grain cleanliness also become poor after 9 times recycling. In short, this effluent could be used, and the optimum recycling would be 9 times.更多还原