Dublin City Council buys OSEC systems from Siemens

Siemens Water will provide two onsite hypochlorite electrolytic chlorination systems to Dublin City Council for the Ballymore Eustace Water Treatment Plant in County Kildare.

The OSEC systems from Siemens, which will replace Ballymore's chlorine gas systems, are part of a series of enhancements that will be made to the 72-year-old plant over the next five years.

Once operational in 2009, this will be the largest electrochlorination plant in the UK and Ireland.

Ballymore is Ireland's largest WTP, serving approximately 70 per cent of Dublin.

The expansion will allow the plant to increase its capacity from 250 Ml/d to 318 Ml/d, with a planned peak capacity of 400 Ml/d.

Through the electrolysis of a brine solution, the OSEC system produces a 0.8 per cent sodium hypochlorite solution, consuming only salt, water and electricity.

This solution is stored in a day tank and injected into the distribution system by a metering pump.

Fifty-seven litres of 0.8 per cent sodium hypochlorite is equivalent to 0.45kgs of chlorine gas or 3.79 litres of commercial sodium hypochlorite (12 per cent).

Each of Siemens' OSEC systems will produce 1,000 kg/d of chlorine.

The units will operate in tandem, producing 24 hours' worth of chemical during the eight hour low-tariff energy period, reducing costs.

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