HUBER Complete Plant ROTAMAT® Ro5 The original with well-proven mechanical wastewater pre-treatment components in one machine

Fine screening

Depending on the specific conditions and data, such as peak flow, screenings load and grit load, one of the following HUBER screens is selected:

• HUBER Fine Screen ROTAMAT® Ro1 ‒ Bar spacing 6 or 10 mm
• HUBER Rotary Drum Fine Screen ROTAMAT® Ro2 ‒ Bar spacing 1 - 6 mm
• HUBER Micro Strainer ROTAMAT® Ro9 ‒ Bar spacing 1 - 6 mm
• HUBER Multi-Rake Bar Screen RakeMax® ‒ Bar spacing 2 - 10 mm
• HUBER Belt Screen Esca Max® ‒ Perforation 3.5 - 10 mm
• HUBER Fine Screen STEP SCREEN® SSF ‒ Slot width 3 or 6 mm

Other separation sizes can be supplied on demand. Separate details are available for all of these machines.

Screenings treatment

The HUBER screens Fine Screen ROTAMAT® Ro1, Rotary Drum Fine Screen ROTAMAT® Ro2 and Micro Strainer ROTAMAT® Ro9 include an integrated screenings press for dewatering and compaction and therefore do not require an additional wash press. Screenings washing with an optional IRGA unit is possible. Solids concentration of screenings: up to 45% DS.

For HUBER Fine Screen STEP SCREEN® SSF, HUBER Belt Screen EscaMax® a separate HUBER Wash Press WAP® is usually installed behind these HUBER screens. Solids concentration of screenings, depending on the WAP® type used: up to 50% DS.

Grit separation

The grit channels of the HUBER Complete Plant ROTAMAT® Ro5 units are designed in accordance with international standards or the customer’s specific requirements. The grit channels are availabe as aerated or optionally unaerated units. The selection of the grit channel type (aerated or unaerated) depends on various criteria, such as the storm/dry weather flow ratio or whether further grit treatment systems are planned.

Grit removal and discharge

The settled grit is collected from the bottom of the grit channel with a horizontal grit screw. An inclined grit screw conveys, agitates and dewaters the collected grit. The classified grit slides from the upper end of the inclined screw into a HUBER Coanda Grit Washer RoSF4 T. Optionally, the material can be pumped to the grit washer.

Grease separation and removal (optional)

Separation of fats and grease is only available when used with aerated grit channels. The grease is collected in a separate chamber with the partition between the grit trap chamber and grease chamber consisting of a slotted scum board. The flow generated within the grit trap chamber by the aeration system transports the grease through the slotted scum board into the grease chamber. In contrast to many competitors, the floating fats and oils are skimmed off the water surface with a paddle scraper that is slowly pulled with a stainless steel rope. The paddle is shaped so that it removes virtually all floating matter from the grease trap. Anaerobic degradation of fat and grease, and there-with odor nuisance, is thus prevented.

Optional integrated grit washing

In this case the horizontal grit conveyor transports the separated grit fractions directly into a grit washer which is integrated at the Complete Plant outlet. Due to a defined introduction of upwardly directed service water the grit situated within the lower part of the grit washer is fluidised within the flow enabling the lighter organic particles to be separated from the dense grit particles. The separation of the lighter organic particles from the dense grit particles is supported by a rabble rake. After removal of the organic material the clean grit is automatically removed by a classifying screw, statically dewatered and discharged into a container.