2H Water Technologies was contracted to design and install a TUBEdek™ lamella system into large settlement tanks for the stormwater solid liquid separation at a Belgian sewage treatment works.
In consultation with the client, the technical staff at the 2H Centre of Excellence (Water & Wastewater) in Germany were able to devise and innovative, modified support system to suspend the TUBEdek™ from the launders, eliminating the need for columns down to the base of the tank and allowing the rotating solids scrapter to operate beneath the lamella module uninhibited.
The launders had to be designed and built to take the load from the lamella susphension, as well as allowing for the buoyancy and gravity forces experienced wheather the tank is full or empty. The maximum alloable deflection for the launders is ±3mm.
Stainless steel main support beams provided the base for special GRP beams on which the TUBEdek™ modules were placed. These were designed to keep the TUBEdek™ channels free from obstruction and thus prevent interference with the settling process. Even flow distribution into any settlement treatment is important to allow best possible removal of the settleable solids and it was here that 2H’s significant knowledge and experience was key to re-designing the influent distribution system to include flow breakers in the influent channel which optimised the delivery of water into the lamella tank.
In total, 900m3 of FS41.50 TUBEdek™ was supplied to treat a flow of 14,600m3/h. The finished system achieves a process efficiency of 80% (settleable solids).
The facilities at the 2H Water Technologies factory allowed a full test assembly of the completed modules, prior to shipment to confirm the size and layout and enable a quick efficient installation phase at site.
The overall result was a significant reduction in the size and cost of the main support beams and an installation offering optimum performance and easy operation.
