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UV disinfection specialist Berson has helped the town of Carnation in Washington, US, create an environmentally friendly way of dealing with wastewater, using Berson’s Inline 7500+ UV systems.

Carnation, which has around 1,900 residents, has never used a central sewage system, relying instead upon individual septic tanks and drainage fields to handle its wastewater disposal needs.

However, soil surveys conducted in 1987 revealed that the city’s current wastewater disposal method had become insufficient for the growing population’s needs and continued usage of the current system posed a contamination threat to the local unprotected aquifer.

Carnation anticipated its future growth and recognised the associated health and environment problems that could come without a more developed wastewater system.

To deal with this issue, Carnation worked with officials from King County to develop plans for a new sewage system and wastewater treatment facility.

Officials chose to integrate a membrane bioreactor (MBR) system with UV disinfection technology to ensure that the treated water would be clean and environmentally safe.

Reclaimed water would then be discharged to the nearby 24-hectare Chinook Bend Natural Area to foster growth of wildlife and restore the wetlands.

To find UV disinfection equipment suitable for this application, King County turned to Berson (via its US sister company).

Berson provided two parallel Inline 7500+ UV units installed in series after the MBR system.

The units are closed vessel, which allows them to flange directly to the piping from the MBR.

Each UV unit is capable of treating large volumes of water, with one unit treating up to 5.3 million litres per day and the second unit providing back-up treatment.

The system utilises Berson’s medium-pressure, high-intensity lamps to provide a compact footprint for disinfection.

The Inline systems are low maintenance, with automatic mechanical cleaning to keep quartz sleeves surrounding each UV lamp deposit free.

According to Carnation wastewater plant supervisor, Dan Zimmer, the UV equipment’s performance has met expectations producing reclaimed water for the facility without any permit violations.

In May 2010, after two years of operation, the automatic cleaning system had worked trouble free and the UV lamps only required a single change.

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