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ISSN:2394-3661 | Crossref DOI | SJIF: 5.138 | PIF: 3.854

International Journal of Engineering and Applied Sciences

(An ISO 9001:2008 Certified Online and Print Journal)

Recycling of Spent Unhairing-Limming Liquor

( Volume 5 Issue 8,August 2018 ) OPEN ACCESS
Author(s):

F. E. Faki, A. E. Musa, G. A. Gasmelseed, I. H. Elamin

Abstract:

Unhairing – limming process is the most polluting operation in leather industry. In hair burn unhairing -limming method, lime and sodium sulphide and a huge amount of water are used to destroy and remove hair from hides and skins generating a large amount of effluent. Sodium sulphide is harmful to human and environment. As an effective substitution to sulphide has not yet been developed, recycling of lime – sulphide liquor has become one of the better options for pollution control. In the present study, direct recycling of unhairing – limming liquors was carried out. The liquors were reused 7 times after had been replenished with reduced quantities of chemicals and water. An average savings of about 28% in sodium sulphide, 32% in lime and 75% in water were obtained. The quality of crust leathers produced by recycling of limming liquor has not been changed comparing to control leathers.

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