Danish packaging manufacturer Styropack (DK-6752 Glejbjerg; www.styropack.com) says it has achieved significant time and cost savings since installing an ultraviolet disinfection system from Berson (NL-5674 TL Nuenen; www.bersonuv.com) to treat water in its open cooling tower. The cooling water is used for compressors, production equipment and a steam boiler.

Part of the Dutch Synbra Group (www.synbra.com), one of Europe´s largest packaging and insulation companies, Styropack had been experiencing problems with the water cooling system because of fouling by organic material and bacteria. This necessitated thorough cleaning every six months – a time consuming and costly process.

The reduced efficiency of the cooling tower meant its ventilators were often operating at maximum power, resulting in increased power costs. In addition, there was increased consumption of make-up water in the plant.

Following an unsuccessful trial with biocides, Styropack decided to assess a UV disinfection system. A Berson in-line system with medium pressure UV lamp was installed. The UV light destroys micro-organisms´ DNA, RNA and enzymes, ensuring permanent, irreversible inactivation.

The only regular maintenance now necessary for the cooling tower is an annual service and UV lamp change carried out by on-site staff. The tower´s ventilators now also run at the minimum level, saving energy, the company says.