The other two companies forming the consortium are the Irish civil construction company Ascon and British Anglian Water. ABA is commissioned by the municipal service company Dublin Corporation to design, build and also operate the plant for 20 years after its completion.

The plant is situated on a peninsula at the mouth of Liffey, the river that divides Dublin's city center. "All the surrounding land is owned by the Electricity Supply Board and by Dublin Port, who both are extremely short of land," explains Battie White, project engineer at Dublin Corporation. The solution to having too little space was provided by technology from ITT Industries' Sanitaire unit (a subsidiary of ITT Flygt) a company focused on creating innovative wastewater treatment technologies for municipal and industrial wastewater treatment facilities.

Sanitaire provided 96 stainless steel decanters for 24 sequencing batch reactor tanks (SBR tanks) for the plant. To save space, the tanks, each measuring 52 by 39 meters were stacked on top of each other, instead of in a row. But because of the location, there are height restrictions of 28.8 meters.

Restrictions apply also for the storm overflow settlement tanks that will be built on the site of the original turn-of-the-century works. The storm tanks will have a capacity to hold 56,000 cubic metres.There will be four decanters in each SBR tank, all moving with one motor. The 40 ft (12.2 m) stainless steel decanters are coupled into pairs and connected by a line shaft to act as one.

The decanters work by decanting the treated water from the top down, withdrawing only the uppermost clear water from the basin and prevents disruption of the settling solids. The decanter equipment requires minimum maintenance, and enables plant personnel to observe effluent quality at all times, it also provides emergency overflow control and a uniform rate of discharge.

Contact & Information:

Sanitaire
9333 N. 49th Street
Brown Deer, WI 53223 USA
Phone: (414) 365-2200
Fax: (14) 365-2210