Lower wastewater loading during unhairing

摘要

COD in the hair-save process is reduced by 62% compared with the hair-burn process. When soaking and liming water accounts for 25% of total water consumption used up to the finished leather, the COD share is more than 75%. The cost reduction is estimated to be around 30% by reducing the required separation of the sludge and the nitrogen content in the hair-save process is lowered by 42% compared with a conventional hair-burn process. Cost reductions can be up to 40% lower on the wastewater treatment using the methods outlined in this paper for the required biological treatment.