Articles & Case Studies


Posted: Wednesday 3rd July 2013

ACWA’s innovative and popular Nitreat®, nitrate removal technology is being installed as part of a prestigious contract at Severn Trent Water’s Lilleshall borehole site in the West Midlands.

The Company has been awarded a design and build subcontract, including process, mechanical, electrical and instrumentation works for a nitrate removal plant to serve the site, from main contractor Mott MacDonald Bentley.

The Lilleshall borehole is one of three that currently supply Severn Trent’s Redhill distribution service reservoir. Two of the boreholes, including Lilleshall, produce water that contains a high concentration of nitrate. The third borehole, which is a low nitrate source, has historically been blended with the other sources so that a good final water quality can be achieved.

However, as nitrate levels at all three boreholes are now rising, Severn Trent Water has concluded that the blending solution will not deliver the required treated water nitrate levels in future, and has commissioned the current project.

The Nitreat® process is a true counter-current continuous ion exchange process for removing nitrate that uses a unique multiport valve to distribute feed and regeneration flows to multiple resin vessels. The process has been widely adopted as a solution for high nitrate sources across the UK by water companies – so far, in AMP5, around 90% of the installed nitrate removal plants have utilised this system.

Years of careful optimisation, undertaken in partnership with water industry clients, have enabled ACWA to maximise capex savings by leveraging the solution’s remarkable reliability, and also to drive significant opex savings by minimising salt consumption and waste.

The aim of the Lilleshall project is to treat the 13.8MLD maximum combined flow from the boreholes, which has a maximum nitrate concentration of 56.8mg/litre, to produce a final blended nitrate concentration of 44mg/litre - safely within the drinking water standard.

ACWA’s Executive Proposals Director Gary Harris said “We are delighted that our Nitreat technology is being adopted to help sustain the high quality of water that Severn Trent requires from these West Midlands boreholes. The Lilleshall project is an excellent example of this unique system’s adoption as an optimum solution for nitrate-rich water sources.”

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