SKIPTON, England - ACWA Services has been contracted to design and build a nitrate removal plant for Anglian Water’s Retford Water Treatment Works (WTW) in the East Midlands.
Drinking water quality in Nitrate Vulnerable Zones (NVZ) has traditionally been achieved by blending water from different sources to achieve Drinking Water Inspectorate (DWI) quality targets.
But as nitrate levels in rivers and underground aquifers continue to rise, this has become increasingly problematic for a number of water companies to maintain.
ACWA’s solution included design, installation and commissioning for all process, mechanical, electrical and instrumentation works and is based on the company’s Nitreat Ion Exchange process.
Once operational this will treat a total works flow of 12,900, m3/day, drawn from Retford’s existing boreholes.
Treated water from the process will be blended to meet DWI target nitrate concentrations of less than 50 mg per litre. The ten month project is expected to be completed by the end of 2016.
The Nitreat system is a counter current continuous Ion Exchange process for nitrate removal utilising a patented multi-port distribution valve. This distributes the feed and regeneration flows to multiple resin pressure vessels, with process flows including absorption, displacement, brine regeneration and regeneration rinse, all cycled by the distribution valve.
This is our 17th Nitreat project for Anglian Water. Other UK utilities using the technology include Cambridge Water, Severn Trent, Thames Water and Yorkshire Water.
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