Severn Trent Services - Apliclor Wins Contract to Provide Chlorine Dioxide Disinfection Systems for Drinking Water Treatment Plant in Arrigorriaga, Spain

BARCELONA, Spain – Severn Trent Services - Apliclor has been awarded a contract by the Water Consortium Bilbao – Bizkaia (CABB) to supply three Aquadiox® chlorine dioxide generators for the Venta Alta drinking water treatment plant in Arrigorriaga, Spain.

The Arrigorriaga plant is one of the largest water treatment plants in Spain with a capacity of 7m3/s. Each Aquadiox chlorine dioxide generator has a treatment capacity of 15 kg/h (750 ppd) to supplement two existing systems, each with a treatment capacity of 7.2 kg/h (360 ppd). The systems produce chlorine dioxide on site to oxidize reduced iron, manganese, sulphur compounds and certain odour-causing organic substances in raw water. Chlorine dioxide also provides residual disinfection preventing bacteria from forming in the plant's distribution network. As a disinfection alternative to the traditional use of chlorine, chlorine dioxide disinfection reacts less with organic matter present in the distribution network, minimising the formation of Trihalomethanes, a disinfection by-product that is considered harmful to human health and the environment.

According to Enric Cardoner, operations director of Severn Trent Services' European Water Purification business, "Water and wastewater treatment plants across Europe have increasingly turned to on-site chlorine dioxide generation for their disinfection needs. In fact, we have won multiple contracts for these systems from the CABB, including for the provision of disinfection systems to treat water from the River Nervion in 2007; the original disinfection system updates to the Venta Alta plant in 2008; and the disinfection system for a water treatment plant in Durango in 2010."

About Severn Trent Services

Severn Trent Services ( with global headquarters in Fort Washington, Pa., USA, is a leading supplier of water and wastewater solutions. The company's broad range of products and services is concentrated around disinfection, instrumentation and filtration technologies and contract operating services. Our analytical services group is the United Kingdom's leading environmental testing organization. Our operating services business provides contract management, operations support and systems improvements for utility, industrial and commercial water and wastewater customers in the United States, United Kingdom, Ireland and Italy. Severn Trent Services is a member of the Severn Trent Plc (London: SVT.L) group of companies. Severn Trent is a FTSE 100 company.

About Severn Trent Services-Apliclor

In Spain, Severn Trent Services-Apliclor has nearly 100 years experience in the treatment of water and has been a part of Severn Trent Services since 2009. The company's headquarters is in Sant Marti Sesgueioles (Barcelona) in a 19,000 m² facility. The technical division designs installations for the treatment of water and carries out the maintenance of these plants, while the chemical division sells products for the purification and maintenance of swimming pools.


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Eric Risch

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