Process Equipment Update
Fig. 3. The WEDECO K-series UV disinfection system from Xylem, which will be used in the largest UV disinfection project ever undertaken in Sweden.
less frequently, it uses less preservative in the finished product, and the final water has no unwanted residuals, so the taste and colour is not altered in any way. This all adds up to a cleaner, greener process and product,” she added.
According to Hanovia, meeting the increasingly
rigorous hygiene standards required in the brewing and beverage industries is a real challenge. If improvements need to be made to plant and equipment, they need to bring quick returns on the investment and measurable improvements in product quality. For manufacturers seeking to improve the quality
of the end product, UV is an economic, realistic option, says the company. It is an established method
of disinfecting drinking water throughout the world, and is also widely used for high purity applications such as pharmaceutical processing and microchip manufacturing, where water of the highest quality is essential (Fig. 1). There are no microorganisms known to be resistant
to UV - this includes pathogenic bacteria such as Listeria, Legionella and Cryptosporidium (and its spores, which are resistant to chlorination). Overall, says Hanovia, UV disinfection systems
are also easy to install, with minimum disruption to the plant. They need very little maintenance, the only requirement being replacement of the UV lamps every 9-12 months, depending on use. This is a simple
Lenntech’s complete UV solutions A
ccording to Lenntech, increasingly stringent industry regulations coupled with the emergence of resistant strains of bacteria are two of the major driving forces behind the growth of interest in UV systems. Consequently the company offers complete UV systems for high technology industries such as pharmaceutical, chemical, semiconductor, soft drinks, water treatment, potable water and offshore platforms. At the other end of the spectrum, its low-cost domestic systems have been successfully solving individual water quality problems for many years. Today the company supplies medium
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pressure, low pressure and low pressure amalgam disinfection systems – along with special ultraviolet systems that offer clients an individually tailored service to solve the most complex of disinfection problems.
For example, for a water treatment company, Lenntech has completed a project that treats effluent flow based on a flow through open channel arrangement. This is incorporated in stainless steel channels and concrete channels. The effluent system uses medium pressure UV mercury discharge lamps, which enables variable lamp power output to be included, extending lamp life and increasing energy efficiency by
means of UV dose control. Each system features banks of medium pressure UV lamps, divided into independently removable lamp support racks that can be removed without necessitating system shut down. Lenntech has also designed and delivered
an ozone/UV installation for an unnamed pharmaceutical company. In this system softened water is disinfected and biofilm formation is prevented by the use of a duplex ozone system. The water is de-ozonised before use in the process by a quadruple UV system. The system is PLC controlled and the quality of environment and water is controlled via a variety of control systems. ■
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