The PIERdek system supports trickling filter BIOdek media.
The support structure is installed on a flat but sloped concrete floor and carries the load from the fill media and the biofilm towards the floor without impacting the ventilation.
The PIERdek installation is tailored by variations of the component spans to hold the required operational load, which depends on the media height, the thickness of the biofilm and the specific surface of the media.
PIERdek has an open structure to maximise air flow and drainage and is constructed in plastic with stainless steel fixings. This makes it ideal for long-term applications in more corrosive wastewaters such as in nitrifying filters where the alkalinity has been known to corrode dwarf wall support structures.
The support structure consists of vertical stanchions which are installed in a specific pattern calculated to match the operational load.
The stanchions rest on slope adjustable (0-5%) base plates and hold a pair of FRP beams on the top. Perpendicular to the top is the actual support, made of pultruded grating.
For media depths greater than 3m the support should be a minimum of 400mm high and provide a minimum supporting area beneath the media of 25%. This higher support allows room to incorporate air vents in the filter tank wall below the media.
All components are fixed with a set of anchors and brackets.