Articles & Case Studies

Evoqua’s CoMag System Selected by Severn Trent for Phosphorus Removal at Cannock Facility

Posted: Friday 26th June 2020

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 Evoqua Water Technologies has been selected by Severn Trent and its design and construction partner, MWH Treatment, to supply Evoqua’s CoMag® ballasted clarification system for the Cannock Sewage Treatment Works located in the West Midlands region of the United Kingdom. This CoMag system will be the second tertiary treatment system supplied by Evoqua with Severn Trent, following the installation of the Finham Sewage Treatment Works located near the Town of Coventry in the United Kingdom.

Evoqua’s CoMag system will help the Cannock Sewage Treatment Works reduce both total suspended solids and phosphorus before the treated water discharges into a local river. Algal blooms and poor river ecosystems trigger high levels of phosphorus in rivers. To combat the blooms and restore water bodies to “good” status, the UK Environment Agency’s National Environment Programme (NEP) is imposing low phosphorus limits on many wastewater treatment plants, including Cannock. The CoMag system will significantly decrease the amount of phosphorus that the works discharges and ensure compliance with the new phosphorus limit of 0.30 mg/l of total phosphorus (T-P).

“For Cannock, the CoMag system has been designed to achieve phosphorus limits of less than 0.24 mg/l T-P,” said Simon Radford, UK Sales Manager of Evoqua’s Municipal Wastewater Treatment business. “This capability gives Severn Trent the confidence that the CoMag system can meet the 0.3 mg/l limit in the future, even if there are increased demands on the facility from population growth or greater amounts of industrial discharge.”

Cannock Sewage Treatment Works currently treats waste from a population of approximately 65,000. The design of the CoMag system will allow for future treatment expansion by a further 12% by 2033. The CoMag system uses magnetite – fully inert, iron ore particles – to enhance the clarification process. The system settles chemical floc up to 30 times faster than conventional clarification. For communities that face challenging wastewater characteristics due to industrial discharge or dense populations, the CoMag system is the ideal solution.

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August 2021

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