Irton Water Treatment Works Water Quality Upgrade
Project Value €/£
£ 2 million
MS2JV (Yorkshire Water)
£ 2 million
Yorkshire Water’s Irton Water Treatment Works (WTW) is located 5.5km southwest of Scarborough in North Yorkshire. The WTW abstracts water from an aquifer via numerous boreholes and supplies two local service reservoirs.
The site has an abstraction licence for 23.5 MLD. On average, the works supplies around 16 MLD. Due to a deterioration in raw water quality and increased risk of pesticides within the raw water, Yorkshire Water appointed Morgan Sindall Sweco Joint Venture (MS2JV) to investigate the installation of pesticide removal and pH correction equipment to achieve effective clarification and reduce cryptosporidium risk.
The outline design/notional solution was to install a pesticide removal plant, based upon a granular activated carbon (GAC) adsorption and ozonation process in line with Yorkshire Water’s Asset Standards. The notional design comprised of new large concrete GAC filter tanks to be housed in a new building.
The costed proposal for this notional solution was outside of Yorkshire Water’s budgetary constraints and MS2JV engaged with Glanua to find an innovative alternative solution for the GAC plant that could deliver the desired outcomes within budget without compromising quality.
Glanua’s review of the outline design/notional solution and asset standards determined that significant savings could be achieved if a modular approach was taken based on the principles of Design for Manufacture Assembly (DfMA).
Our approach was to design and manufacture a modular packaged plant, which comprised of 10 (No.), 3.0m diameter, 7m tall steel pressure vessels (for GAC) with interconnecting process pipework, a new clean backwash tank and pump set, dirty backwash water waste tank, as well as a new MCC is included in the scheme.
Our operations and maintenance team worked closely with the Yorkshire Water Operations team to ensure they were comfortable with the operability of the solution given our solution was significantly different to the outline design which was based on their asset standards.
As the original outline design was gravity-fed open GAC concrete tanks it would have required an interstage pumping station to be constructed. Our GAC packaged plant solution was designed to sustain pressure and therefore meant that this interstage pumping station was no longer required. This had both significant CAPEX and OPEX savings for our client.
Further, given that the original outline design comprised of open GAC concrete tanks, it required a significant building to be constructed. Our GAC packaged plant was a closed system and completely negated the need to construct a building.
Glanua used 3D modelling to be able to maximise the use of offsite fabrication for the works. This ensured that the filters, walkways, pipework sections, pipe supports, kiosk and other components were partially or fully completed in controlled manufacturing environments and were assembled on site as a turnkey solution.
Advantages of our approach:
- Removed need for a new filtration building;
- Removed need for interstage pumping station (including opex costs);
- Improved flow control through filter cells;
- Reduced on site construction works incl. temporary works and maximised offsite delivery;
- Mitigated risk of delay due to other works;
- Reduced CAPEX by estimated £2-3 million.