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Severn Trent Services provides underdrain system for water treatment plant in Kansas, US

14 January 2013

Severn Trent Services has provided its TETRA LP Block filter underdrain system to the Water Services Department of Kansas City, Missouri, US.

The water department will use the system at its 240 million gallons per day water plant, located along the Missouri River.

The underdrain system was ordered by Black & Veatch, the project engineer for the plant.

Under the contract, Severn Trent will install 24 filter cells of size 14ft X 50ft covering a surface area of 16,800ft².

The company also provided new stainless-steel backwash air headers for the filter to simultaneously backwash with air and water.

The 10in diameter air headers were designed to fit under the floor of the filters with J-Risers to bring air through holes in the concrete floors to the underdrain.

Severn Trent Services filtration director Joe Bonazza said the TETRA LP Block is a low-profile, low-headloss, lightweight design product that is easy to install.

"The TETRA LP Block is easy to assemble, has exceptional installation strength and a maintenance-free life," Bonazza added.
Made up of HDPE moulded plastic blocks, the TETRA LP Block is a dual parallel lateral underdrain system.

It can effectively distribute air and water for concurrent or sequential backwashing, while its design ensures no blockages to interrupt filtration.

The underdrain system also features patented grout grip design, which increases resistance to uplift from the filter floor and provides more pullout strength than a conventional underdrain system, said the company.