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® RoK1 Durable screen for effective solids retention at stormwater discharge points
Self-cleaning screen for efficient solids retention in stormwater tanks and overflows
- Efficient solids separation
- Continuous automatic screen cleaning
- Defined solids removal
- For discharges with limited upstream head possibilities
- Robust, low-maintenance stainless steel design
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 installed, these measures often prove insufficient to prevent pollution. Unsightly items such as sanitary products, toilet paper, feces, and plastic materials not only harm the environment but also lead to substantial cleaning and disposal costs.
Efforts to improve our collection and drainage systems have been intensified. Particularly vulnerable receiving water bodies and nature conservation areas necessitate more comprehensive and targeted measures for effective stormwater treatment, ensuring their ecological preservation and sustainability.
HUBER Storm Screen ROTAMAT® RoK1 as screen installed at the down-stream side of the overflow weir.
ROTAMAT® Storm Screen RoK1 installed at an overflow weir
HUBER Storm Screen ROTAMAT® RoK1 TS with a cross conveyor for high solids loads
HUBER ROTAMAT® Screen RoK1 installed in a stormwater discharge channel
ROTAMAT® RoK1 screens installed at an angle of 60° on both sides of an overflow
Return of screenings into the sewer
Unsightly matter discharged during storm events, typical for stormwater discharges without coarse material retention
HUBER Storm Screen ROTAMAT® RoK1 at a strom water discharge.
Two HUBER Storm Screens ROTAMAT® RoK1 arranged in series to increase throughput capacity.
HUBER Storm Screen ROTAMAT® RoK1 TS for defined discharge of screenings
Combination of HUBER Storm Screen ROTAMAT® RoK1 and HUBER Pumping Stations Screen ROTAMAT® RoK4 for direct discharge of screenings.
HUBER Storm Screen ROTAMAT® RoK1 with 2 mm perforated plate downstream of the grit chamber to protect the biological treatment stage within a sewage treatment plant.
Design and Function
The ROTAMAT® RoK1 screen is an ideal solution for solids retention at stormwater discharges, suitable for both new installations and refurbishments. This screen is part of a group of fine screens engineered to handle high flow rates with exceptionally low hydraulic resistance. Its two-dimensional screening design ensures excellent solids retention, while the automatic and gentle cleaning of the perforated plate maintains optimal performance and efficiency.
The RoK1 screens are installed horizontally on the downstream side of overflow weirs. A screw flight is mounted within a half-cylinder made of perforated plate. As stormwater flows through the horizontal perforated half-pipe, solids are effectively retained. A rotating screw, equipped with a brush on its flights, moves within the semi-circular screen trough. This action not only cleans the screen but also gently pushes the retained screenings toward the end of the trough for efficient disposal.
At the end of the trough, the screenings are either returned to the sewer and transported to the wastewater treatment plant or removed via a cross conveyor for further disposal. During storm conditions, the screen automatically activates and operates fully autonomously, ensuring continuous and efficient performance without the need for manual intervention.
Installation conditions
The RoK1 screen can be installed on either the left or right side of the weir overflow, with standard inclination angles of 0° and 60°. To accommodate varying structural and local hydraulic conditions, the screen is designed for flexible installation into existing buildings. The full screen surface is available from the start of a storm event, minimizing hydraulic resistance and ensuring very high solids retention throughout the process.
Applications
The HUBER ROTAMAT® Screens RoK1 are versatile and can be used in a variety of applications within the combined sewage sector.
To minimize maintenance, it is generally not necessary to remove screenings from the structure. Instead, the screenings remain in the sewer or tank and are introduced into the wastewater treatment plant after the storm event.
For high solids loads and/or challenging flow conditions, the HUBER Storm Screen ROTAMAT® RoK1 can be equipped with a cross conveyor, transforming it into the HUBER Storm Screen ROTAMAT® RoK1 TS. The screw conveyor returns the separated screenings to the wastewater flow at a designated point. Alternatively, if preferred by the customer, the screenings can be discharged into a container using the cross conveyor.
The Benefits of the HUBER Storm Screen ROTAMAT® RoK1
The screen is installed behind the weir overflow. This design results in the following favorable benefits:
- Optimal solids retention by means of two-dimensional screening (perforated plate)
- Low hydraulic resistance due to installation at weir height
- The perfect solution for discharges with limited upstream head possibilities
- Defined screenings discharge
- Designed for seamless retrofitting into existing structures
- Option for full submersion of the screen
- Available with cross conveyor as RoK1 TS if required
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