Construction Begins at One of U.K.â€™s Largest Tertiary Treatment Plants
Construction has recently begun on one of the largest tertiary wastewater treatment plants in the U.K. The plant, to be built at Severn Trent Waterâ€™s Strongford Sewage Treatment Works, will use Severn Trent Servicesâ€™ TETRA NSAF (Nitrifying Submerged Aerated Filter) technology to reduce the ammonia in the plantâ€™s effluent from 15 mg/l to 3 mg/l. The facility is scheduled for completion in the fall of 2008.
The TETRA NSAF, an up-flow, fixed film biological reactor, is a proven, robust system that generates minimal additional solids requiring post-treatment handling and disposal. Its effectiveness in ammonia removal has been demonstrated at several plant installations throughout the U.K. over the past 10 years. A new process â€“ NSAF+ â€“ has been developed to control the very large Strongford plant and will provide significant savings in electricity costs over a conventional NSAF plant.
The total plant area for the Strongford NSAF will be 1,400m2, which will accommodate a flow to the plant of 10,000m3/hr. The technology is extremely 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.
The Strongford facility will be constructed using 10 rectangular concrete cells, each measuring six meters wide and 22.75 meters in length. There will be 10,700 T-Blocks in the facility, which will measure 5Â˝km when placed end to end.
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