Articles & Case Studies

Evoqua’s CoMag System Selected by Welsh Water for Phosphorus Removal at Lletty Brongu and Ruthin

Posted: Wednesday 24th April 2019

Evoqua Water Technologies has been selected by Welsh Water and its design and construction partner, Mott Macdonald Bentley, to supply its CoMag® ballasted clarification system to reduce phosphorus in Welsh Water’s effluent at both the Lletty Brongu WWTW in South Wales and Ruthin WWTW in North Wales. These will be Welsh Water’s first wastewater treatment plants with a permanent installation of Evoqua’s ballasted settling technology in the ‘low P’ schemes.

Algal blooms and poor river ecosystems are triggered by high levels of phosphorus in the river. To combat the blooms and restore water bodies to “good” status, the UK Environment Agency’s National Environment Programme is imposing low phosphorus limits on many wastewater treatment plants, including Lletty Brongu WWTW and Ruthin WWTW. The CoMag system will significantly decrease the amount of phosphorus that the works discharge and will ensure compliance with the new phosphorus limits of 0.5 mg/l and 0.25 mg/l, respectively.

“After evaluating several technologies, we selected the CoMag system because it allows us to cost-effectively meet new phosphorus discharge limits,” said Andrew Bowen, Head of Alliance for Welsh Water.

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 increasing populations, the CoMag system is the ideal solution. The tertiary CoMag system will help Welsh Water reduce both total suspended solids and phosphorus before the treated water discharges into the local river.

‘’For both Lletty Brongu and Ruthin, the CoMag system was compared in meticulous detail with a number of competing technologies,” said Simon Radford, UK Sales Manager of Evoqua’s Municipal Wastewater Treatment business. ‘’The combination of performance reliability to consistently produce reliable high-quality effluent with low Total Phosphate (T-P) and the excellent value that the CoMag system provides were crucial in making their system choice.”

“For Ruthin, the CoMag system has been designed to achieve phosphorus limits of less than 0.18 mg/l T-P,” said Radford. “This capability gives Welsh Water the confidence that the CoMag system can meet the 0.25 mg/l limit in the future, even if there are increased demands on the facility due to population growth.” Normal 0 false false false EN-US X-NONE X-NONE




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November 2019

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