HUBER Rotary Drum Fine Screen ROTAMAT® Ro2 / RPPS / STAR Reliable and well-proven inlet screen for wastewater and process water screening

The HUBER Rotary Drum Fine Screen ROTAMAT® operation is based upon a unique system that allows combination of screening, washing, transport, compaction and dewatering in a single unit.

Depending on the screen bar spacing (0.5 - 6 mm) or perforation (1 - 6 mm) and screen size (screen basket diameter of up to 3000 mm), the throughput can be individually adjusted to specific site requirements. The HUBER Rotary Drum Fine Screen ROTAMAT®  is completely made of stainless steel and acid treated in a pickling bath.

HUBER Rotary Drum Fine Screen ROTAMAT® units are either installed directly into the channels, or are supplied as tank-mounted units, with an inclination of 35°. The wastewater flows into the open end of the inclined screen basket and then through the screen. Floating and suspended materials are retained by the screen basket. Blinding of the screen surface generates an additional filtering effect so that solids can be retained that are smaller than the bar spacing or perforation.

The basket starts to rotate when a certain upstream water level is exceeded due to screen surface blinding. The rotating screen drum lifts the screenings and drops them into the centrally arranged trough. Screenings removal from the drum is supported by a scraper brush and a spray nozzle bar. A screw conveyor in the trough rotates with the drum and transports the screenings through a closed and inclined pipe. The conveying screw transports, dewaters and compacts the screenings, without any odour nuisance, and discharges them into the customer‘s container or a subsequent conveying unit.

HUBER Rotary Drum Fine Screen ROTAMAT® PRO

The special design of the HUBER Rotary Drum Fine Screen ROTAMAT® PRO series isolates the water level in the trough from the water levels upstream and downstream of the screen. This is achieved with a closed system below the perforated plate of the trough. The liquid phase is removed from the closed system by a suction pump which pumps the flow back to upstream of the machine. The solids are washed, compacted and discharged by a conveying screw. This operation method permits continuous screen operation with a constant water level upstream of the machine. Continuous system operation significantly increases throughput capacity.

The PRO system can even be reliably applied with high downstream water levels and is especially suitable for pump applications. As backup of water into the trough is impossible, screenings discharge via the removal screw can reliably be ensured. It is easy to retrofit into any type of HUBER Rotary Drum Fine Screen ROTAMAT®.

HUBER Perforated Plate Screen ROTAMAT® STAR

The HUBER Perforated Plate Screen ROTAMAT® STAR is especially designed for fine apertures and for large wastewater volumes in a gravity line with low headloss. Its design is based on the well-proven ROTAMAT® principle: screenings separation, washing, transport, and compaction in one unit. To improve screen throughput capacity, the RPPS Star screen has a star-shaped screen basket with a zigzag folded surface. The star-shaped folded plate of the HUBER Perforated Plate Screen ROTAMAT® STAR provides an increased free screen surface and an approximately 30 % increase in throughput capacity with the same nominal diameter. The STAR design combines the benefits of maximum free screen surface and very high separation efficiency. This efficiency-improving innovative development permits for optimal and economical system dimensioning, it is space-saving and reduces civil costs. Installation is suitable into existing channels or for tank installation.

HUBER Perforated Plate Screen ROTAMAT® STAR units are preferably used with perforations of 1 / 1.5 / 2 mm for installation on municipal and industrial wastewater treatment plants. The screens are also applied to protect downstream membrane systems by removal of hair and fibres. They can be installed in the mechanical treatment stage or downstream of grit traps. Special PRO design screens are available for applications where an additional increase in throughput capacity is required.

Integrated Screenings Washing System IRGA

To optimise the treatment process an integrated screenings washing system IRGA can be provided and also easy retrofitted. It improves the carbon/nitrogen ratio of the pretreated wastewater. In addition, the IRGA reduces the costs of screenings disposal to an optimal cost/performance ratio.

The HUBER ROTAMAT® principle allows for integration of the screenings washing system directly in the trough and/or the lower end of the rising pipe. As the soluble matter is separated from the inert material, faeces are virtually completely washed out which leads to a significant weight reduction by approx. 50 % and improved operating and hygienic conditions.

The dewatering performance of up to 40 % DS can be increased to more than 45 % DS by adding a high pressure unit (HP) to the integrated screenings washing system IRGA. This combination guarantees the maximum dewatering performance and reduces disposal and operating costs.