The aquarake is a self cleaning filter system which can be installed directly into an open channel. This means that the water can be screened without any pumping. The filter surface consists of an “endless belt” of high quality plastic fingers which is moved by chains and a motor drive. The fingers are protruding outward by the rotating motion around the sprocket, ejecting the solids. Automatic cleaning is achieved by a reverse curve in the path, which causes the fingers to retract and to be wiped clean against the neighbouring fingers. The size of the separated solids is determined by the slot width between the plastic fingers. Standard slot widths are 1, 3, 6, 10 and 15 mm. The final design is also determined by existing channel dimensions. If required, Nijhuis Water Technology can supply a stainless steel channel with inlet and outlet flanges. Optionally the screen can be equipped with a cleaning device using water or air.

The prominent feature of the curved screen is that it “slices” the water with wedge wire bars in such a way that solids of a size of only half the slot width are retained on the screen while the water is falling through. The filtered water is discharged at the back. The size of the separated solids is determined by the distance between the wedge wire bars. Standard slot widths are 0.25, 0.50, 0.75, 1, 1.5 and 2 mm.  To avoid clogging of the screen the standard curved screen can be equipped with a cleaning device using water or brushes. The vibrating curved screen uses a motor which vibrates the screen. This vibrator ensures a clog free screen and quicker removal of solids from the screen. The vibrating curved screen can also be equipped with a spray cleaning device.

 

In the rotary screen the water flows from the top through a rotating drum and leaves the drum from the inside to the outside of the bottom. This way any remaining solids are removed which makes the rotary screen self cleaning. The rotating drum transfers the solids to a scraper blade which removes the solids. The size of the separated solids is determined by the distance between the wedge wire bars which form the drum. Standard slot widths are 0.5, 0.75, 1, 1.5, and 2 mm.  The rotary screen can be equipped with a second scraper blade which intermittently cleans the first one and a spray cleaning device if deemed necessary.