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FishFlow - Fish-safe Rotary Drum Screen for Water Intakes
Many industrial facilities extract water from lakes, rivers or coastal waters for cooling installations, hydropower or water supply. The entrainment of floating debris or fish can have adverse effects on industrial processes and cause fish mortality. The innovative rotary drum screen that has been developed by FishFlow Innovations effectively separates solid objects from the intake water. The unique characteristics of the drum screen make it possible to return fish unharmed to surface waters and reduce the costs for the processing of solid wastes.
During operation the main (cooling) water pumps of the industrial facility pump surface water into the drum. A motor drives the central axis of the screw and rotates the drum screen. The bulk volume of water passes through the mesh screen of the drum and enters the industrial facility, whereas the screw carries fish and other solid objects over the length of the drum towards an outlet.
The solid objects that are filtered from the water remain submerged throughout their passage through the rotary drum. As a result fish survive and remain undamaged. Both fish and other solid objects can be returned to the surface waters. The rotary drum screen of FishFlow Innovations makes additional filters and solid waste processing systems unnecessary.
The innovative rotary drum screen can be applied in a wide range of water intake facilities. The design of the installation, the area of filtration and the mesh size are chosen based on the local specifications, including flow rate and type of suspended solids.
The rotary drum consists of a mesh screen that is tightly fitted around an Archimedean screw. This screw is build in a composite material and has a specially designed entrance. As a result the rotary drum screen is 100 % fish-friendly and virtually maintenance free.
