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Berson UV has installed 10 UV disinfection systems on the Caribbean island of Aruba – eight systems disinfect drinking water and two treat greywater prior to discharge.

The island opted for UV instead of chlorine as part of its ‘non-chemical’ approach to water treatment.

Five Berson UV units are installed at the Balashi water-treatment plant, the site of gold-mill ruins near Aruba’s capital, Oranjestad.

Operated by WEB Aruba NV, which supplies drinking water and electricity to the island’s residents and businesses, Balashi also houses the world’s second largest desalination plant.

Aruba has a semi-arid climate so desalination is necessary to supply its growing population with water.

Following the desalination process, the water passes through the UV systems before being transported to seven storage tanks situated at elevated locations around the island.

The UV units, which are installed outdoors and controlled by DGtronic microprocessors, each disinfect 400m3 of water per hour, rising to 600m3/h during peak-flow conditions.

No chlorine is used at any stage of the water-treatment process.

Chlorine was originally considered as an alternative to UV but was rejected because of concerns over costs and safety and also because WEB Aruba has an anti-chemical policy.

Two of the seven storage tanks situated around the island are also fitted with Berson’s Inline UV systems, providing an additional disinfection step prior to distribution.

It is expected that all the tanks will eventually be fitted with UV.

One of the storage tanks is situated in the harbour and supplies cruise ships with UV-treated drinking water.

In addition to disinfecting drinking water, two Berson UV systems are also used to treat greywater.

One unit is installed at each of the island’s two wastewater-treatment plants and the treated greywater is used to irrigate the island’s two golf courses.

The Dr Horacio Hospital on the island also uses UV technology.

Berson’s compact Inline medium-pressure UV systems use Multiwave lamps, which emit a wide spectrum of UV wavelengths with a very high energy output, causing the total and permanent deactivation of micro-organisms.

The small size of the lamps means they are positioned perpendicularly to the flow of liquid, increasing disinfection efficiency and reducing the overall size of the disinfection unit.

Berson UV can provide UV systems with capacities between 10 – 10,000m3/hour, certified to the latest German DVGW norm, W294, Part 1, 2 and 3 – the highest standard currently possible in the world.

The systems are also fully validated in accordance with the USEPA UV Disinfection Guidance Manual (UVDGM).

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