Facts & Figures

 ClientIrish Water
 LocationDublin - Ringsend, Ireland
 Operation Start2017
 Project TypeRetrofit
 Process ConfigurationPre-treatment + Primary settler + Nereda
 Nereda Design Capacity:
  • Dry Weather Flow21 MLD
  • Peak Flow1,698 m3/h
  • PE2,400,000 PE (PE = 60 gBOD/d)

About the Dublin, Ringsend WWTP Upgrade & Expansion Project

The existing Ringsend Wastewater Treatment Plant (WWTP) in Dublin was commissioned in 2003 and has a design capacity of 1.64 million population equivalent PE handling a flow of 11.3 m3/sec. but is now operating over that capacity at 1.9 million PE. The principal effluent requirements were based on only Carbon (BOD and SS) removal. The existing WWTP consists 24 SBR tanks, stacked in a two-layer deck of each 12 SBR tanks. Each SBR tank has a volume of 13,500 m3.

To address current overloading situations and related bottlenecks in the operation, and to introduce nutrient removal to meet the level of treatment required by the (European based) Urban Wastewater Treatment Directive, a major upgrade of the plant at the existing site is proposed. Following the upgrade project, the Ringsend Wastewater Treatment Plant will have the capacity to treat the wastewater of 2.4 million PE (144,000 kg BOD/d) and 600,000 m3/d, with a peak flowrate of 13.8 m3/sec.

The Major Works involved in the Project are:

  • Construction of a ‘green field’ plant Expansion at the existing, undeveloped, site (0.8 ha)
  • Retrofitting the existing SBR tanks to increase their treatment capacity
  • Conduct a review and assessment of the current Sludge handling and treatment facilities to accommodate the increased sludge production. This includes the evaluation of requirements for removal of Phosphorous from the Sludge Stream
  • Review and assessment of the current and required Power Requirements with regard to the current Maximum Import Capacity
  • Assessment of all other existing units and need for upgrade and / or replacement works

Overall completion of the Ringsend Project is estimated to be in 2027.

Currently, one of the SBR tanks was retrofit into a Nereda and is fully operational.


Image: Operacional Nereda Reactor

Consortium with global experience and local knowlegde

Royal HaskoningDHV is working on the Project in a consortium with its Irish partners, TJ O’Connor & Associates and J. B. Barry and Partners. The Operation & Maintenance of the Plant is carried out by the Operator ‘Celtic Anglian Water’ (CAW).

Some characteristics of the project are:

  • Scale, 40% of all Irish wastewater is treated in this facility
  • Requirement to remove nitrogen and phosphorus
  • Complexity, treatment plant will be in operation during retrofit
  • Small footprint available for extension
  • The existing installation is a Sequencing Batch Reactor (SBR)

View more information on the Dublin, Ringsend WWTP Process Proving Step 1 and 2 here.