Filter Beds, Ballyboden WTP, Dublin

Project Overview

AQL have completed works to 5 filter bed tanks in Ballyboden Water Treatment Plant, Dublin. This plant plays a crucial role in supplying water to homes and business in Dublin city. Overtime, the structure had begun to exhibit signs of structural wear and leakages due to the nature of its use. As well as this, the water treatment process was to be changed, so some adjustments had to be made to the filter beds. Adrian Queally Ltd (AQL) was engaged to carry out a comprehensive refurbishment of the filter beds, addressing both external and internal deterioration while applying protective coatings to prolong the structure’s lifespan.

client objectives

Ensure the longevity and structural integrity of the filter beds Conduct essential concrete repairs to prevent further deterioration. Apply protective coatings for erosion resistance and long-term performance. Stop any leaks within the tanks Ensure compliance with potable water safety standards for internal surfaces. Ensure any changes are made to accommodate the new water treatment methods.

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Scope of works

Surface Preparation Works – Due to an existing coating, all concrete surfaces had to be shot blasted to remove the coating and allow for a compatible bonding surface. All surfaces were then high pressure cleaned to remove dust and residue created by abrasive blasting. Concrete Build Up- All concrete surfaces received a build-up layer of cementitious mortar due to the concrete aggregates being exposed. This allowed for sufficient cover to be returned to the rebar, and an aesthetically pleasing, easy to clean surface. Crack Injection- All pipe penetrations within the tanks received resin crack injection to stop any water egress. Surface Protective Coatings- All concrete elements that have been eroded or damaged due to erosion were rectified and DWI approved coatings were applied to protect the concrete in the future.

Challenges

Open Shot Blasting- Due to the dust and debris from open shot blasting, the tanks were fully encapsulated to protect the environment, contain the debris and cause no effect to neighbours.Surface Contaminants & Deterioration: The presence of accumulated grime, biofilm, and pollutants on concrete surfaces necessitated a thorough high-pressure clean-down before coatings and repairs could be applied.Potable Water Safety Compliance: The interior of the filter beds required the application of a fully compliant, potable water-approved surface waterproofing system to meet regulatory standards.

Results

Structural Longevity: The repairs and protective coatings significantly enhanced the lifespan of the filter beds, ensuring long-term durability. Regulatory Compliance: The potable water-approved waterproofing system ensured the interior met the highest safety and hygiene standards for water storage. Improved Aesthetic & Functional Integrity: The filter beds now appear revitalised, with a clean, reinforced exterior that enhances its structural performance. Watertight- The resin crack injection has made the tanks watertight, allowing no water to leave or enter the tank through leaks. This makes the system more efficient, as no water is being lost or contaminated.

Conclusion

The successful completion of Ballyboden WTP Filter Bed refurbishment project highlights AQL’s expertise in structural water infrastructure repairs. Through meticulous planning, industry-leading materials, and specialist application techniques, AQL delivered a high-quality, long-lasting solution that ensures the water reservoir remains operational and compliant for years to come.