Osberstown Wastewater Treatment Plant

Project Overview

AQL have completed work to sedimentation tanks in Osberstown WWTP. These tanks are vital to the treatment process in the plant and suffer from harsh erosion due to chemicals and gases. Overtime, the structure had begun to exhibit severe signs of structural wear in the lines of, loss of concrete cover to rebar, breakdown of joint filler and blowholes in the concrete. Adrian Queally Ltd (AQL) was engaged to carry out a comprehensive refurbishment of the tanks, 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 tanks. Conduct essential concrete repairs to prevent further deterioration. Return concrete cover to the rebar for protection and prolong the life of the structure Apply protective coatings for resistance against the mechanical process, gas build up and provide long-term performance. Ensure there will be no leaks within the tanks

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Scope of works

Surface Preparation Works – All internal surfaces were subjected to a high-pressure clean-down to remove contaminants, debris, and surface deterioration.Concrete Repairs- Soft, damaged and heavily eroded concrete was removed and/or repaired to return optimal cover to the rebar and allow for structural integrity.Joint Sealing- All joint sealer within the tank were removed, joints were cleaned and new joint sealer was installed that is resistant to the chemicals and gases present.Surface Protective Coatings- All concrete elements received build up layers of cementitious coatings to return optimal cover to rebar. The top metre of the walls and the launder channel were then coated in a chemical resistant system as this is where the gases and erosion would take place.

Challenges

Wastewater- As this was a wastewater tank, all elements had to be disinfected and contaminants removed to ensure the safety of all involved. Special PPE was also worn as an extra measure to protect all operative and project visitors.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.Severe Erosion- Due to the treatment process and the gases present, these tanks were exposed to severe erosion and attack. In partnership with suppliers, AQL proposed a specification and carried out the works to accommodate the environment the structure was in.

Results

Structural Longevity: The repairs and protective coatings significantly enhanced the lifespan of the tanks, ensuring long-term durability. Erosion Resistance: The joint sealing, concrete repairs and coatings provided long-term resistance against harsh erosion, reducing maintenance requirements. Improved Aesthetic & Functional Integrity: The reservoir now appears 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 Osberstown WTP refurbishment project highlights AQL’s expertise in structural water infrastructure repairs and led to more works being awarded to AQL in another area of the plan. 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.

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