|
A key component in the construction of wastewater treatment plant (WWTP) facilities is drainage under the water process vessels. The subsurface drainage system under the process vessel serves three functions: relieves hydrostatic pressures below the process vessel structure, provides leak detection and removal, and provides a capillary break.
The vessel can be lined with concrete, a geomembrane or earthen material. Concrete lined vessels typically utilize a sacrificial nonwoven geotextile or sacrificial layer of gravel with a binding agent between the concrete and drainage layer to prevent blinding of the drainage layer. In geomembrane-lined vessles a nonwoven geotextile may also be used, but here it is used as a cushion to provide interface friction on slopes.
The benefits of using a tri-axial geocomposite meet all three requirements of the subsurface drainage system under the process vessel: high flow capacity, compressive resistance over long periods of time, constant void space for capillary break, and rapid fluid movement from point of entry to collection.
|
