Total lime and sulfide free dehairing process of skin or hides using animal and/or plant enzymes

摘要

A method for unhairing animal skins or hides using a total lime and sulfide free enzymatic solution comprises preparing an enzymatic solution from animal or plant tissue, optionally pre soaking the skin or hide in water, removing the soaking liquor and applying the enzymatic solution by pasting or spraying on the flesh side of the skin or hide and leaving for 10 to 24 hours at a temperature between 10oC to 60oC wherein the skins or hides are arranged flesh side to flesh side or grain side to grain side, floating the skin or hides in liquid comprising the enzymatic solution, removing the skins or hides from the liquid to produce an effluent and then unhairing the skins or hides either by scraping the hair with curved knife on a wooden beam or by using unhairing machine. Preferably the effluent produce exhibits a reduced biological oxygen demand, reduced chemical oxygen demand and/or reduced total dissolved solids.