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bgu - Fine Slotted Screen
The Fine Slotted Screen is constructed entirely of stainless steel 316 ensuring reliable trouble free operation. Self adjusting brush provides automatic cleaning of screening surface in both directions. The Fine Slotted Screen cleaning system may be driven by a water wheel (requiring no external energy) or by an electro-hydraulic drive, depending on site constraints. Slotted screening surface ensures the retention of all solids greater than 3/16". Design of cleaning system mechanism ensures that moving parts are never submerged. Modular design allows for installation over virtually any overflow weir type and size. Easy to retrofit into existing structures. May be installed in the vertical or diagonal position when the preferred horizontal arrangement is not possible due to site constraints.
Stormwater discharge systems and combined sewer overflows (CSO) are the weak points in sewer systems, usually at the expense of water pollution prevention. They are entry points through which urban pollutants reach the receiving stream. In the past, there were frequently no adequate preventive measures available or in place. Today however, there are legal requirements in many areas for the retention of floating and suspended matter in stormwater and combined sewer overflow systems. The Fine Slotted Screen economically provides effective receiving stream protection. It is designed to be installed over stormwater discharge sills, settling tank overflow weirs, CSO weirs, flood discharge systems, etc... Its modular design makes it suitable for any type of overflow system and is easily retrofitted to existing structures.
The Fine Slotted Screen design is based on a special stainless steel screening surface, with slotted screen openings of 3/16" x 1" and a total free area of 50 %, achieving the highest possible degree of solids retention while minimizing the head loss
The Fine Slotted Screen screening surface is made up of a series of 3/16"x1" slots and has a clear opening of 50%. During an overflow event, the solids retained by the screen are continuously cleaned by the back and forth movement of the cleaning brush. The preferred installation is horizontal, however it may also be installed vertically or diagonally to satisfy any existing structural constraints.
The Fine Slotted Screen can be driven without the need for external energy as the cleaning mechanism may be powered by the proven principle of the water wheel. The water wheel powers a gear drive which converts this energy into an oscillatory motion. A weighted, self-adjusting brush, attached to the guide carriage, is driven back and forth across the screening surface, pushing all retained solids into storage areas, found at either end of the screen modules. Because the screen is continuously brushed clean, clogging of the screening surface cannot occur. The retained solids are discharged into the sewage stream at the end of an overflow event and carried to the sewage treatment plant for removal.
The Fine Slotted Screen may also be equipped with an electro-hydraulic drive (where site constraints warrant), whose electronic components are located well outside the overflow structure. Only biodegradable hydraulic oils are used.
The Fine Slotted Screen may be installed in combination with an Overflow Bending Weir Type U bending weir to maximize the use of all available upstream in-situ storage and to minimize the frequency of an overflow event.