Cooling water.

Separating "oil" from cooling water.

Many processes require some form of cooling, and water is the most commonly used medium for this. Although contact between the cooling water and possible pollutants can often be avoided, there are numerous processes where this is not possible. A typical process that necessitates contact between cooling water and the product is quenching, whereby the hot product (or raw material) is immersed in water to achieve instant cooling down. Quenching is a common process in steel manufacturing, glass production and with certain chemical processes.