NIBuilder 35-1 Feb-Mar

PROJECT PROFILE

DERG WATER TREATMENT WORKS

BIM 3D modelling was implemented during the ECI and main contract phases.

additional functionality, including the provision of larger pH-correction, lime- dosing pumps to establish a robust dosed raw water treatment facility. Determining the most desirable pH range for coagulation for the varying raw water was key, and ensuring the dosing system was adaptable and quick to react to fluctuations was a challenge for the team. The Murphy project team successfully designed and commissioned a raw water data-informed auto coagulation control algorithm to achieve beneficial use dates, in the absence of a bespoke auto coag system on back order. With generation of higher quantities of sludge than envisaged, additional control measures became necessary. Operational attention had to be more frequent during the commissioning phase, to ensure the desired quantity and quality of sludge was returned to the existing plant and downstream pressing facility. A key process unit for the project commissioned by Murphy, in conjunction

with the innovation team at NI Water, was a Purafloc liquid carbon storage and dosing facility to enhance removal of MCPA from the raw water to acceptable levels. Optimising the new chemical dosing facility for an unfamiliar product, namely Purafloc, was challenging during the early part of the project and during commissioning. Reactive design improvements became necessary based on feedback from other NI Water sites undergoing trials with the product. This included enhanced control-functionality and the inclusion of top-mounted mixers in each of the silos to ensure a homogenous mix was maintained. The new installation has been in operation since March 2023 and has delivered excellent results, proving itself in challenging conditions. Since the optimisation of the coagulant and pH correction systems, there have been no MCPA or THM failures at Derg WTW.

Designing and commissioning a process solution sufficiently robust to sustain high-quality clarified water treatment of varying raw water colour and turbidity was a notable achievement for the Murphy Water Team. As was achieving the project programme beneficial-use milestone of March 2023, dictated by stringent Drinking Water Inspectorate enforcement dates. Shane said, “Close collaboration was required during the ECI design and construction periods, and good relations were maintained throughout with the client and other contractors from management team through to the site delivery team.” Over the past 55 years, Murphy has built a reputation for quality and excellence in Ireland, offering industry-leading and fully integrated turnkey solutions to both the municipal and industrial water and wastewater sectors encompassing all aspects of design, construction and operation and maintenance.

1 Shepherds Drive, Carnbane Industrial Estate, Newry, Co Down BT35 6JQ T: +44 (0)28 3026 2021 - E: mail@murphygroup.co.uk www.murphygroup.com/ie

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