Cryoconcentration of olive mill wastewater for application in leather tanning process: an alternative end to protect the environment and save raw materials consumption.

The aim of this work is the cryoconcentration of olive mill wastewater (OMW) to produce highly concentrated polyphenols solutions that can be applied in the tanning industry. The treatment by cryoconcentration consists of four steps: cooling, freezing, sweating, and melting. The operation purifies the ice in depth by partially melting the impure zones trapped in the pockets of concentrated solutions formed in the ice.