TOBIN Consulting Engineers were appointed in 2004 as Client’s Representative for the Stage 5 expansion of the Leixlip Water Treatment Plant. The current expansion, with a capital cost of approximately €30 million, includes for the construction of a state of the art “stand-alone” facility, on a site adjacent to the existing treatment infrastructure with a capacity of 80Ml/d plant which, when combined with the existing facilities (175Mld), will bring the total potential peak through the capacity of the entire plant to 225Ml/d. This total capacity will serve up to one-third plant of the third demand in the Greater Dublin Region, and it effectively provides the planning headroom for the Shannon Project.
The new Stand-Alone Water Treatment Plant was constructed within the curtilage of a new building with overall dimensions of 90m x 43m and an overall height of 10m with a separate an annex (12m x 12m) used to house a number of nonprocess elements. The building houses the following elements of the water treatment plant expansion.
- Inlet Pumping Station and Flash Mixer
- 4 No. Sedimentation Tanks;
- 6 No. Filters;
- Plant Room (Blowers and Air compressors);
- Workshop and Store;
- Control Room;
- Fluoridation Room and Bulk Storage Room;
- Disinfection Process Room;
- Alum Tanks, Alum / Acid Dosing Room & Alum Delivery Room;
- Polyelectrolyte Dosing Room;
- Activated Carbon Dosing Room (relocated from behind existing administration block);
- ESB Substation and Meter Room;
- SCADA & Mimic Control Room;
The fabric of the buildings was designed to present a high-quality appearance and a high degree of integration where the selection of the materials was of paramount importance in ensuring a long design life with the mal necessity for significant maintenance to the fabric or structure of the building all with a view of having a design life of not less than 50 years. The proposed Main Treatment Building was constructed using a steel frame with a wall and roof cladding system with the following finishes: –
- Metal cladding with grey tone finishes and colours backed with insulation and metal linear sheets on blockwork and steel structure;
- Selected curtain wall glazing system (with backlighting to northern elevation);
- Metal capping with grey-toned finishes and colours and
- Metal louvres with grey-toned finishes and colours.
The contract for the construction stage was signed in December 2011. Works are now substantially complete.