Combined UV-chlorine dioxide disinfection system benefits Spanish reuse facility

BARCELONA, Spain, March 22, 2010 -- Spain's first-ever combined ultraviolet (UV) and chlorine dioxide disinfection treatment system has been installed by Severn Trent Services-Apliclor at a wastewater treatment plant in Reus...

BARCELONA, Spain, March 22, 2010 -- Spain's first-ever combined ultraviolet (UV) and chlorine dioxide disinfection treatment system has been installed by Severn Trent Services-Apliclor at a wastewater treatment plant in Reus – a site operated by the municipal water company Aigues de Reus Empresa Municipal.

The disinfection system uses microwave ultraviolet technology combined with Aquadiox chlorine dioxide generators to treat wastewater for a variety of reuse applications, reducing the plant’s effluent discharge volume.

The plant, which serves the wastewater treatment needs of communities in the province of Tarragona, has a treatment capacity of 25,000 m3/day.

The MicroDynamics system uses microwave energy to energise UV lamps, which the company said helps to generate "consistent-strength disinfection".

The Aquadiox chlorine dioxide generator will produce chlorine dioxide on site to provide residual disinfection, preventing bacteria from forming in the plant’s distribution network.

Sodium chlorite and hydrochloric acid will be used to generate the chlorine dioxide solution. Severn Trent Services-Apliclor said the benefit of using chlorine dioxide disinfection is that it reacts less with organic matter present in the distribution network, thus eliminating odours and minimising the formation of Trihalomethanes.

Rick Bacon, general manager of Severn Trent Services-Apliclor, said: “The MicroDynamics system combined with the chlorine dioxide generators will provide assurance for users that all water in the Reus network – including the water in the pipes and at the point of use – is treated safely.”

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