Ireland - Services

Services

Wastewater Collection, Treatment & Disposal

RPS has extensive experience in the development of public wastewater infrastructure.

We provide strategic planning advice, design services, procurement expertise and project supervision to ensure the realisation of wastewater collection and treatment projects under various contract types.

We have in-house specialist engineers and scientists in treatment process, sludge treatment, SCADA / MEICA, pumping, network modelling, outfall design and HASCON / HAZOP assessment. Our multidisciplinary teams of planners, project managers, modellers, hydrologists, hydrogeologists, process designers, civil, hydraulic, mechanical and electrical engineers deliver complex projects from feasibility assessment and planning through to construction, commissioning and operation. Our asset management experts focus on optimising the whole-life performance of existing and new assets.

We have delivered wastewater collection systems and treatment plants for villages and towns across Ireland, with populations ranging from 500 to 300,000.

Case Studies

Cheekpoint Sewerage Scheme

 

 

RPS has completed the design and construction supervision of a new €3.2m wastewater treatment plant and collection system in County Waterford.

The project comprised construction of a new 750 PE treatment plant and 4km of gravity sewers, including a storm overflow pipe laid 190m out into the River Suir. The treatment processes and infrastructure will ensure the local environment is better protected from the adverse effects of urban wastewater with a significant improvement in the water quality of the River Suir.

The new plant will provide the village of Cheekpoint with a modern sewage collection and treatment system capable of meeting current and future development needs. The old septic tank systems which only provided primary treatment have been decommissioned and the new plant is fully operational. A higher standard of wastewater treatment, comprising primary and secondary treatment processes and UV disinfection, complies with the required Urban Wastewater Treatment Directive Standards and the European Council Shellfish Directive.

Corrib Onshore Gas Pipeline

Corrib Onshore Gas Pipeline

Shell E&P Ireland Ltd. (SEPIL)

RPS was responsible for developing an approach to surface water management during construction that would minimise potential impacts in an environmentally sensitive area.

RPS provided specialist technical input to the project in the following water related areas:

Flood risk assessment studies

Water catchment modelling

Drainage design for Landfall Valve Installation (LVI), pipeline construction works on land and tunnelling compound (> 3.7ha)

Wastewater design for tunnelling compound

Temporary surface water treatment systems for enabling works phases

Detailed design of surface water treatment system for tunnelling compound (300m3 per day) including high rate lamellae settlers, sand ballasted lamellae settlers, disc filters, pH dosing etc.

Technical support to SEPIL construction team for commissioning of surface water treatment system

Technical support for procurement, operations and maintenance of surface water treatment systems

 

Surface water management was particularly challenging on this project given that much of the construction was in peat and located in close proximity to Sruwaddacon Bay.

Dunlavin Wastewater Treatment Plant

 

Image: courtesy of Niall McGovern / GEDA

 

This project provides a modern wastewater network capable of meeting all current and future needs, while meeting all current environmental standards.

RPS prepared a preliminary report for Wicklow County Council in 2006 on the rationalisation and upgrading of wastewater treatment facilities in Dunlavin. This involved an appraisal of two existing treatment facilities, which were in poor condition, and recommendations for a single treatment plant with preliminary design and process options. It also included mapping and modelling of the sewer network to identify future upgrading and extension options, as well as any requirements for separation of foul and surface water systems.

RPS recommended a new wastewater treatment plant for 2,400 PE, expandable to 3,600 PE on a site adjacent to one of the two existing plants. One of the old plants was to be replaced with a pump station to transfer flows to the new plant. Due to the low assimilative capacity of the local stream, the outfall had to be relocated 5km downstream, with the effluent pumped along this length.

RPS prepared tender documents in 2013 and the €4.3m design & build contract was awarded to Geda-Ovivo Joint Venture. The new treatment works is now fully operational, protecting and maintaining the water quality in the River Greese.

Under a separate smaller contract, a new surface water collector pipe was also installed in the main street to reduce flows to the new treatment plant. The watermains in Dunlavin were also rehabilitated.

Skibbereen Sewerage Scheme

 

 

RPS was responsible for the planning, design and construction supervision of a major upgrade to the wastewater collection infrastructure in the town of Skibbereen, Co. Cork.

The River Ilen, an important fishery and tourism amenity which flows through the town centre, discharges into Roaringwater Bay, a Special Area of Conservation under the EU Habitats Directive.

RPS was responsible for all stages of the €20m project from preliminary engineering report to detailed design and the preparation of contract documents, statutory permissions (planning permission & foreshore licence), as well as wayleaves, procurement and administration of the construction contracts.

We also produced the Environmental Impact Statement for the proposed wastewater treatment plant. This new plant, constructed as part of a separate contract, has a current capacity of 4,700 persons with a planned ultimate capacity equivalent to 9,400 persons.

Civil, mechanical & electrical contracts included the construction of up to 20km of pipeline, varying from 225mm to 1200mm in diameter. The construction of four outlying pumping stations ensures that flows are delivered to the main pumping station, which is constructed adjacent to the town centre. A telemetry system based at the main pumping station allows the online monitoring of all pumping equipment. The combined storm and wastewater flows arriving at the main pumping station are balanced within a 900m3 stormwater storage tank. This controls flow passed forward for treatment to the new wastewater treatment plant.

During construction, the challenging ground conditions necessitated the use of both open-cut and trenchless (directional drilling, auger boring and microtunnelling) techniques for the construction of the pipelines. Deep chambers were constructed using caisson techniques, and where necessary, 20 - 30m long steel piles provide foundation to structures.