Local water conditions
The main part of Gränges’ water use is for cooling purposes, where much of the production equipment requires cooling water for efficient operations and to prevent overheating and production disruptions. The plants in Americas and Asia have closedloop cooling systems with a high degree of water recirculation, which reduce water consumption and the risk of water contamination. In addition, water is used to make up emulsions in different process steps and for domestic purposes.
In the production site in Huntingdon ground water from the company’s own wells is used, whereas municipal water is used in the Salisbury and Newport production sites. Cooling takes place in closed-loop systems using non-contact cooling towers. As the systems are closedloop, and therefore contain no contaminants, the used water can be discharged to nearby water bodies or to local waste water treatment plants without further treatment. Contaminated water is sent for external treatment.
In Gränges’ operations in Asia, municipal tap water is used. Water from the cooling system is re-used in other parts of the production process, for example in the cold rolling mill. Water of insufficient quality is discharged to the local waste water treatment plant, in accordance with the local drainage permit which limits water volumes and types.
In Gränges’ operations in Europe, surface water is withdrawn from two nearby lakes. The water is primarily used to cool components and is then released into local waterways. Daily measurements are made to ensure that the released water does not contain hazardous substances. Water that may contain contaminants is treated by an external partner before being returned to water bodies.