Depending on the region and the type of structure, overflow discharge at a combined sewage screening system occurs several times a year. Usually, it is assumed that a storm screen is in operation for about 1000 hours in 10 years.
HUBER Storm Screen ROTAMAT® RoK2 Robust, upward-flow storm screen for effective solids retention at stormwater discharge points
Self-cleaning screen for effective solids retention in stormwater tanks and overflows
- Efficient solids separation
- Continuous automatic screen cleaning
- Highly adaptable to various systems
- Ideal for integration with water retention elements
- Durable, low-maintenance stainless steel construction
During and after storm events, significant amounts of debris are released into streams, rivers, and lakes through stormwater overflows from combined and sanitary sewer systems. Even with scum baffles in place, these measures often fail to prevent such pollution. Items like sanitary products, toilet paper, feces, and plastic materials not only create an eyesore but also result in substantial cleanup and disposal expenses.
Efforts to improve our collection and drainage systems have been intensified. Particularly vulnerable receiving water bodies and nature conservation areas demand more comprehensive measures for stormwater treatment to safeguard their ecological integrity.
HUBER Storm Screen ROTAMAT® RoK2 for stormwater discharges
HUBER Storm Screen ROTAMAT® RoK2 for stormwater discharges.
HUBER Storm Screen ROTAMAT® RoK2 before overflow
Several HUBER Storm Screen ROTAMAT® RoK2 arranged in a row with a total screen length of 30 m.
HUBER Storm Screen ROTAMAT® RoK2 after completed installation
Compact solution: HUBER Storm Screen ROTAMAT® RoK2 at a stormwater discharge.
View of the downstream side of a HUBER Storm Screen ROTAMAT® RoK2
HUBER Storm Screen ROTAMAT® RoK2 with an integrated gauging weir for overflow measurement
View of the upstream side and lateral screenings discharge opening
Design and Function
The HUBER Storm Screen ROTAMAT® RoK2 is an optimal solution for addressing this challenge, whether for new installations or refurbishment projects. This screen is part of a class of fine screens specifically engineered to handle high flow rates with minimal hydraulic resistance. Its two-dimensional screening technology ensures exceptional solids retention while providing automatic and gentle cleaning of the perforated plate, ensuring reliable and efficient operation.
The HUBER Storm Screen ROTAMAT® RoK2 is horizontally installed upstream of overflow weirs. It features a screw flight mounted within a half-cylinder made of perforated plate. As stormwater passes through the horizontal perforated half-pipe, solids are effectively retained. The integrated screw, equipped with a brush on its flights, rotates within the semicircular screen trough, ensuring continuous cleaning of the screen. This process gently conveys the separated solids toward a lateral discharge point, maintaining efficient operation and preventing blockages.
The screenings are retained on the polluted water side of the screen, where they are carried away with the wastewater flow. During storm events, the screen activates automatically and operates in a fully automated mode, ensuring efficient and reliable performance without manual intervention.
The HUBER Storm Screen ROTAMAT® RoK2 offers flexible installation options, allowing it to be positioned on either the left or right side of the weir overflow to accommodate varying local hydraulic conditions. Even at low flow rates, the incoming water evenly engages the full length of the screen basket. This ensures gentle removal of screenings without blockages, achieving high separation efficiency while minimizing head loss through its mechanical design.
Applications
The HUBER Storm Screen ROTAMAT® RoK2 is designed for versatile use in the combined sewage sector. To minimize maintenance requirements, screenings are not removed from the structure. Instead, they remain in the sewer or tank and are directed to the wastewater treatment plant after the storm event, simplifying operations and reducing maintenance demands.
Benefits of the HUBER Storm Screen ROTAMAT® RoK2
The screen is installed in front of the weir overflow, providing the following key benefits:
- Optimal solids retention by means of two-dimensional screening (perforated plate)
- Screenings remain on the polluted water side
- No downstream impact on the screen efficiency
- Designed for easy retrofitting into existing structures without complications
- The perfect solution for discharges with limited upstream head possibilities
- Optional emergency overflow
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