As soon as a certain pressure drop across the machine is reached (or optionally after a set time interval), the cleaning of the filter discs begins, whereby the solids that have deposited on and in the pile cloth media are removed again. Cleaning of the filter discs is effected by means of a suction pump.
HUBER Pile Cloth Media Filter RotaFilt® Pile fabric filtration for the tertiary and fourth treatment stage
- Reliable separation of fine suspended solids (sludge flocs, microplastics)
- Ideal for phosphorus removal (flocculation filtration)
- Reliable retention of powdered activated carbon (PAC) for removal of trace substances
- Efficient prefiltration to protect ozonation and GAC adsorption systems for trace substance removal
A pile cloth is a fabric in which pile yarns are firmly bound onto a supporting mesh, creating a three-dimensional structure. The solids are retained by this pile cloth, while the cleaned water enters the interior of the filtration system and is led via a weir to the next stage or into the receiving water.
Materials of HUBER Pile Cloth Media Filter RotaFilt®:
- All metallic parts made of stainless steel (stainless steel parts acid treated in a pickling bath)
- Disc support segments made of high-quality plastic with optimised free surface; uncomplicated replacement of segments and pile cloth media bags
- The right type of pile cloth for every application
HUBER Pile Cloth Media Filter RotaFilt®
HUBER Pile Cloth Media Filter RotaFilt® in operation
Filtration process on the pile fabric filter bags
Filtration chamber with HUBER Pile Cloth Media Filter RotaFilt®
Filter cleaning process in a HUBER Pile Cloth Media Filter Rotafilt®
PAC process ("Ulm process") with downstream HUBER Pile Cloth Media Filter RotaFilt® as polishing filter
Design and Function
The HUBER Pile Cloth Media Filter Rotafilt® consists of several rotatably arranged, disc-shaped filter elements. These are installed vertically and fitted with special filter bags made of innovative pile cloth. The pile cloth has a multi-dimensional structure and consists of a filter-active pile cloth layer and a supporting mesh.
The wastewater that enters the filter chamber flows continuously through the individual filter discs from the outside to the inside. Particulate matter is reliably retained in the pile cloth structure.
Due to the retention of solids, the filter resistance increases and the difference between the water levels on the wastewater and clear water side rises. At a certain pressure loss, the gradual cleaning of the filter discs begins. During this process, retained solids are reliably and effectively removed from the rotating filter elements via suction bars.
The round filter discs ensure that no dead zones are created during the cleaning process. In order to prevent the basin from silting up, the settled sludge at the bottom of the basin is sucked out at regular intervals.
Technical data:
- Available disc diameters: 2,200 mm and 2,700 mm, RotaFilt® 2,200 is available as a basin or tank version.
- All metallic parts made of stainless steel, acid treated in a pickling bath.
- Disc support segments made of high-quality plastic with optimised free surface; uncomplicated replacement of segments and pile cloth media bags.
- The right type of pile cloth media for every application.
- Feeding either by gravity or by pump.
The benefits of the HUBER Pile Cloth Media Filter RotaFilt®
- Optionally one or more suction pumps.
- Suction pumps installed wet or dry.
- Increased effective filter area due to circular arc geometry on inner and outer diameter.
- Complete cleaning of the filter discs, no dead zones.
- Maximised free filter area and minimal disc weight due to the innovative honeycomb structure of the filter elements.
- Cost advantages due to optimised disc diameter.
- Quick and user-friendly installation and removal of filter bags and filter elements.
- Easy installation and removal of the suction modules.
Many advantages through microfiltration with pile fabric
- High separation efficiency combined with high hydraulic capacity.
- Insensitive to sudden peak loads.
- High operational reliability, even under overload.
- No separate flushing water required, thus no flushing water tank required.
- Continuous operation (no interruptions for cleaning).
- Low pressure loss during operation (5-30 mbar, hydrostatic filtration possible without lifting).
- Minimal system footprint.
- Minimised operating and energy costs.
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