HUBER Storm Screen ROTAMAT® RoK2 for stormwater discharges

WASTE WATER Solutions

Automatically cleaned screen for solids retentionin stormwater tanks and overflows– Efficient solids separation– Continuous automatic screen cleaning– Maximum adaptability – Ideal for combination with water retention elements– Sturdy, low-maintenance stainless steel design

HUBER Storm Screen ROTAMAT® RoK2 for stormwater discharges

➤➤➤The situation During and after storm events large amounts of debris are discharged to streams, rivers and lakes through stormwater overflows of combined and sanitary sewer systems.Frequently, even the installation of scum boards is insuffi -cient to prevent such pollution. The polluting items, suchas sanitary products, toilet paper, faeces, plastic foils, etc.are not only unsightly but also responsible for consid -erable cleaning and/or disposal costs. On the basis of theDWA sheet A 128 (an instruction issued by an associationdealing with wastewater treatment) efforts to fundamen -tally improve the protection of waters in this sector havebeen increased. Particularly endangered receiving watercourses and nature preservation areas require more ex -tensive measures concerning the treatment of storm -water.

➤➤➤The solutionThe HUBER Storm Screen ROTAMAT® RoK2 is the idealsolution for this task, whether for new structures orrefurbish ment. The screen belongs to a group of finescreens designed for high flow rates at an extremely lowhydraulic resistance. Two-dimensional screeningguarantees a very high solids retention com bined withautomatic, gentle cleaning of the perforated plate.

➤➤➤The functionHUBER Storm Screen ROTAMAT® RoK2 screens arehorizontally installed at the upstream side of overflowweirs. A screw flight is mounted on a half cylinder ofperforated plate. As the stormwater flows through thehorizontal perforated half-pipe of the screen trough thesolids are retained. A screw, with a brush attached on itsflights, rotates within the semi-circular screen trough. Itcleans the screen and pushes the sepa rated solids gentlytowards the lateral discharge. The screenings remain onthe polluted water side of the screen from where they aretaken along with the waste water flow. During stormconditions the screen is auto matically started and thenworks fully automatically.

Unsightly matter discharged during storm events, typical for stormwater discharges without coarse material retention

HUBER Storm Screen ROTAMAT® RoK2 installed at astormwater discharge

WASTE WATER Solutions

➤➤➤The installation conditionsThe HUBER Storm Screen ROTAMAT® RoK2 can be flexiblyinstalled on the left or right side of the weir overflow tooptimally meet different local hydraulic conditions. Even if the flow rate is low, the oncoming flow approaches thefull screen basket length and the screenings are removedgently without blockage so that a high separation perform -ance is achieved and the headloss minimized mechani -cally.

➤➤➤The applicationsHUBER Storm Screen ROTAMAT® RoK2 units can be usedfor a variety of applications in the combined sewagesector.To avoid another point of maintenance it is generally notintended to remove screenings from the structure.Instead, the screenings remain within the sewer or tankand are introduced into the wastewater treatment plantafter the storm event.

HUBER Storm Screen ROTAMAT® RoK2 after completedinstallation

➤➤➤The user's benefitsThe screen is installed in front of the weir overflow. This design results in the following favourable 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 ➤ For problem-free retrofitting into existing structures➤ The perfect solution for discharges with limited

upstream head possibilities➤ Optional emergency overflow

Flow diagram of a HUBER Storm Screen ROTAMAT® RoK2 installed at a weir overflow

WASTE WATER Solutions

➤➤➤ Technical dataScreen selection and sizing depends on specific hydraulicrequirements and structural conditions.

Trough diameter:300, 500, 700, 1000 mmPerforation:6 mm standard, other perforations available on requestTrough length: up to 7500 mmThroughput:up to 5000 l/s per machine

➤➤➤Installation examplesA selection of installation exampleswill convince you of the HUBER Storm Screen ROTAMAT® RoK2

HUBER Storm Screen ROTAMAT® RoK2 before overflow HUBER Storm Screen ROTAMAT® RoK2 with an integratedgauging weir for overflow measurement

View of the downstream side of a HUBER Storm ScreenROTAMAT® RoK2

View of the upstream side and lateral screeningsdischarge opening

HUBER SEIndustriepark Erasbach A1 · D-92334 BerchingPhone: +49 -84 62 -201 -0 · Fax: +49 -84 62 -201 [email protected] · Internet: www.huber.de

Subject to technical modification0,15 / 6 – 4.2018 – 9.2004

HUBER Storm Screen ROTAMAT RoK2for stormwater discharges