Onsite Hypochlorite Generation for Irish Wastewater Plant

Ballymore is Ireland's largest WTP, serving approximately 70% 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% 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 liters of 0.8% sodium hypochlorite is equivalent to 0.45 kgs of chlorine gas or 3.79 liters of commercial sodium hypochlorite (12%).

The plant and its engineering contractor, Earth Tech of Dublin, considered onsite hypochlorite generation systems from other manufacturers, but Siemens provided one of the smallest footprints. A comparable competitive system would have required multiple units to produce 1,000 kg/d of chlorine, compared to Siemens' OSEC systems that will each be capable of producing 1,000 kg/d of chlorine. Both units will operate in tandem producing 24 hours' worth of chemical during the 8 hour low-tariff energy period, thus saving costs.

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