Gas Conditioning Project at Ringsend Wastewater Treatment Works
Uisce Éireann
Upgrade
Dublin, ROI
As Ringsend Wastewater Treatment Works (WwTW) undergoes major capacity upgrades, boosting treatment capability from 2.1 million PE to 2.4 million PE, the ability to recover and reuse valuable resources on-site has grown significantly.
The upgrades have boosted the site’s biogas-generating output by up to 40%, facilitating the installation of a fifth Combined Heat and Power (CHP) engine. This increase in Biogas output not only improves overall energy efficiency at the Ringsend WwTW but also significantly reduces the reliance on fossil fuels.
Biogas, produced through on-site anaerobic digestion, is central to the WwTW’s sustainability strategy. To optimise its use, CAW, as part of the FaCT3 Consortium, recently delivered a comprehensive new Biogas Conditioning Plant, incorporating biological desulphurisation (H2S removal), siloxane removal and moisture removal drying, followed by activated carbon filtration for final polishing.
The new Biogas Conditioning Plant will ensure that the Biogas quality is significantly improved ahead of fuelling the CHP Units, thus maximising the energy generating efficiency and reducing the maintenance requirements for these Units whilst simultaneously extending their operational life-time.
Project Highlights
Project Scope and Delivery
CAW was responsible for the design, procurement, build, supply, installation and commissioning of the new gas conditioning system.
We were appointed to manage this project based on our strong safety record and extensive experience delivering complex upgrades within operational environments. The scope of works included:
- Supply and installation of Biological desulphurisation (scrubber) with washing and chemical dosing installation;
- Supply and Installation of 2no. Gas Compressors;
- Supply and Installation of Conditioning unit (cooling & heating);
- Supply and Installation of Siloxane filter;
- Supply and Installation of H₂S filter;
- All required piping with supports, appurtenances, drains, vents, purge connections, etc;
- Electrical and control installation;
- Civil works, including a piled plinth for the desulphurisation plant;
- Remove the parts of the old installation that have become obsolete and clear the site;
- Testing and commissioning.
Project Delivery and Outcome
Design and procurement began in November 2024. Building Information Modelling (BIM) was used to create the initial design and to track variations, and then supply the final design for handover.
The civil works included piling activities to support the new reinforced concrete plinths for the upgraded gas conditioning equipment. Throughout the Gas Conditioning Upgrade, CAW maintained continuous operational integrity of existing CHP Units whilst ensuring the highest level of safety in live ATEX zones.
Following the delivery of the new Biogas Conditioning Plant, CAW managed the decommissioning and removal of the existing redundant Biogas Treatment Plant. Final testing and commissioning of the upgraded gas scrubber have been completed, with performance exceeding the specification in the trials for both H₂S and Siloxane removal, with H₂S reduced to 0ppm versus a <33ppm specification, and Siloxane reduced to <0.5mg/m³ Siloxane, vs a <2mg/m³ specification.
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