Technical Director - Water
Irish Water was required to propose and advance remedial actions to resolve these water quality issues in the Skibbereen region. In conjunction with Irish Water, RPS planned and designed a rationalised regional water supply scheme centred on the treatment of drinking water at two water treatment plant sites.
The existing public water supply in the Skibbereen region derives from five separate water sources and treatment plants. There is an insufficient level of treatment at three of these plants and consequently these supplies are listed in the EPA’s Remedial Action List.
Skibbereen Regional Water Supply Scheme
County Cork, Ireland
The initial challenge was to develop a project that balanced the requirements to provide improved levels of treatment while considering the longer term demand for water in the region and the yield of the existing sources. Two broad options were developed, the first proposing the redevelopment of the five existing treatment plants, while the second considered the creation of a rationalised regional water supply scheme centred on the two largest existing treatment plants.
Once the project scope was defined, the most significant challenge was to advance a large and regional scheme with multiple sites through the statutory water abstraction, planning, and land acquisition processes.
In addition, optimisation of the water treatment processes to maximise the removal of natural organic matter and minimise the production of disinfection by-products such as Trihalomethanes (THM) as a key challenge.
Through the development of concept designs and cost benefit analysis, the development of a rationalised regional water supply scheme centred on the treatment of drinking water at two existing plants, allowing the decommissioning of the remaining three existing plants, was identified as the optimum solution.
Upgrades to two retained water treatment plants were designed, as were distribution network extensions and enhancements to facilitate the bulk transfer of water to the supply areas where plants were being decommissioned.
Robust site and route selection processes, allied with extensive environmental studies and appraisals, were critical in successfully completing all statutory processes.
Comprehensive water sampling, jar testing and THM formation potential analysis was undertaken to ensure the enhanced coagulation, flocculation and chlorination processes designed can sufficiently remove the pre-cursors to disinfection by-products. Ultrasonic algae control was specified in one of the retained sources to reduce the effect of algae on the treatment process.
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