We are proposing an alternative approach to this project which involves the use of the Aerobic Granular Sludge (AGS) technology treatment process and the exclusion of the originally planned 9km undersea tunnel.

AGS technology is an advanced nutrient removal technology that is a further development of the activated sludge process. This treatment process will consistently produce high-quality treated wastewater which can be safely discharged into Dublin Bay. We have conducted detailed testing and trials of the technology since April 2015 to treat the wastewater being received at the Ringsend plant. These trials have proved successful; confirming that wastewater treated by AGS technology can be safely discharged to the Lower Liffey Estuary and Dublin Bay.

The revised project

The revised project includes:

  • Proposed exclusion of the 9km long undersea tunnel.
  • Proposed increase in the flow through the plant by approx. 20% thereby increasing the amount of wastewater that can be treated and reducing the level of storm overflows which occur during heavy rainfall events.
  • Proposed extension to treatment capacity and using the AGS technology in the existing treatment tanks, increasing the capacity to 2.4 million Population Equivalent (PE) as approved by An Bord Pleanála in 2012.
  • Proposed expansion of the plant’s sludge treatment facilities to match the overall increase in wastewater treatment capacity.
  • Proposed provision of a new phosphorous recovery process.
  • Proposed provision of additional odour control facilities.

In particular, it should be noted that:

  • No increase in capacity over that approved in 2012 is being proposed.
  • The revised project will meet the same stringent odour control standards as set out by An Bord Pleanála in 2012.
  • From an operational and visual perspective, the revised project is not expected to result in any significant change on the site of the plant from the project approved in 2012. The main change will occur outside the site due to the proposed exclusion of the 9km long undersea tunnel.
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