Benefits Of Medium Pressure UV Convince German Water Board

Berson UV-techniek has won the contract to supply a Berson InLine100+® medium pressure UV disinfection system to the Lahn-Dill-Kreis region of Hesse in Germany. The UV system will treat drinking water for a number of towns in the southern part of the region. The Berson system is certified by DVGW according to the new norm W294, parts 1, 2 and 3 (2006).

According to Mr Schnackenwinkel of the Lahn-Dill-Kreis Water Board, “We chose the Berson InLine100+® unit because of its automatic, mechanical wiping system. This keeps the quartz sleeves surrounding the UV lamps clean at all times – ensuring maximum UV efficiency – without the use of chemicals. Chemical cleaning, a necessity with DVGW-approved low pressure UV systems currently on the market, is costly and environmentally unfriendly so we are pleased to have found a cleaner, lower cost alternative.”

Adwin de Vocht, Berson’s International Sales Manager, added, “Chemical cleaning is also inefficient because a thin film of fouling is usually left behind. This means that low pressure systems currently available have to be completely dismantled every few months for additional mechanical cleaning, a complex procedure requiring each quartz sleeve to be removed and manually cleaned. This time-consuming and costly process requires the UV system to be out of action for at least a day. It also produces unwanted waste products which have to be dealt with effectively.”

Another advantage of medium pressure UV is more effective inactivation of microorganisms. Recent research has shown that Escherichia coli is able to recover more easily following exposure to low pressure UV lamps. This is less likely with medium pressure UV (see references 1, 2 and 3).

Based in the Netherlands, Berson UV is a world leader in UV technology for a wide range of applications, including drinking-, process- and waste-water treatment, dechlorination, ozone removal and TOC reduction. It is one of the few suppliers in Germany capable of providing a complete range of UV systems certified to the newest DVGW, W294 norm. For more information please visit the company’s website at


1. Oguma, K., Katayama, H. & Ohgaki, S. (2002). Photoreactivation of Escherichia coli after low- or medium-pressure UV disinfection determined by an endonuclease sensitive site assay. Applied & Environmental Microbiology, Vol. 68, No. 12, 6029-6035.
2. Zimmer, J. L. & Slawson, R. M. (2002). Potential repair of Escherichia coli DNA following exposure to UV radiation from both medium- and low-pressure UV sources used in drinking water treatment. Applied & Environmental Microbiology, Vol. 68, No. 7, 3293-3299.
3. Hu J. Y.,  Chu, S. N.,  Quek, P. H., Feng, Y. Y.,  and Tan, X. L. (2005). Repair and regrowth of Escherichia coli after low- and medium-pressure ultraviolet disinfection. Water Science and Technology: Water Supply, Vol. 5, No. 5, 101-108.

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