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Severn Trent Services is to provide its Tetra NSAF (nitrifying submerged aerated filter) and Tetra Deepbed filtration technologies for upgrades to Northumbrian Water’s Consett sewage treatment works.

Severn Trent Services is to provide its Tetra NSAF (nitrifying submerged aerated filter) and Tetra Deepbed filtration technologies for upgrades to Northumbrian Water’s Consett sewage treatment works.

The filtration systems are being employed to accommodate a growing population served by the plant, which currently treats 10 million litres of wastewater daily for customers in several surrounding communities.

The contract includes system design, manufacture and installation and was awarded by the project’s general contractor Carillion.

Entec Holdings is the consultant for the project, on which work began in July 2010.

Completion is expected in summer 2011.

Tetra NSAF technology has been proven to effectively remove ammonia and BOD in installations throughout the world, including more than 50 wastewater plants across Europe.

The NSAF is an upflow, fixed-film biological reactor that generates minimal solids requiring handling and disposal following treatment.

The technology is flexible and is available in a range of sizes, from small modular units suitable for above or below ground construction to custom-made configurations for large plants.

Tetra Deepbed filters provide good total phosphorous removal to meet stringent limits below 0.2mg/l.

The system is a downflow sand filter with a high loading capacity, making it suitable for handling peak loads.

The Consett sewage treatment works has five NSAF cells and four Deepbed filter cells.

The new NSAF and Deepbed filters cover 300m2.

The average flow is 14,342m3/hr and the plant is designed to achieve a final effluent consent of 15mg/l BOD, 20mg/l TSS and 5mg/l ammonia.

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