Mathematical modeling of bovine hides swelling behavior by response surface methodology for minimization of sulfide pollution in leather manufacture. (10th November 2019)

• Record Type: Journal Article
• Authors: Liu, Hui; Yin, Zhenhua; Zhang, Qian; Li, Xiumin; Tang, Keyong; Liu, Jie; Pei, Ying; Zheng, Xuejing; Ferah, Cem Emre
• Is Part Of: Journal of cleaner production. Volume 237(2019)
• Publication Date: 2019-11-10
• Subjects: Swelling -- Collagen fibers -- Bovine hide -- Liming -- Sodium sulfide -- Response surface methodology (RSM); Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2019.117800
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Excessive utilization of such sulfides as sodium sulfide always results in serious wastewater pollution in the liming processing of leather manufacture, and thus the critical or optimal consumption of sodium sulfide is necessary. In this work, it was found that the swelling behavior of bovine hides is highly dependent on the liming time as well as temperature and the sodium sulfide concentration. In order to understand the swelling mechanism and optimize the swelling condition, a mathematical model was built based on the response surface methodology (RSM). As a result, the predicted values (Pva) were in good agreement with the experimental values (Eva) by analyzing the absolute as well as relative errors, and the optimized operation conditions were found to be performed in 0.85 wt% Na2 S solution at 25 °C for 895 min, by which the polysaccharides in hair follicle are dissolve completely and meanwhile the collagen fiber bundles are swollen and disperse very well. Highlights: A mathematical model for bovine-hide swelling by sodium sulfide is established using RSM. A way to reasonably use sodium sulfide in liming is proposed. A theoretical basis for cleaner leather making technique is provided. EVG staining combined with slice digital scanning is applied.