The screen surfaces are cleaned by a spray nozzle bar. The water required for this is extracted directly from the filtrate. From time to time, chemical cleaning is necessary, which can remove biofouling or inorganic residues that occur over time.
HUBER Disc Filter RoDisc® Micro screen with rotary mesh for reliable removal of fine suspended solids
- Retention of filterable solids from the secondary clarifier effluent
- Reduction of phosphorus by upstream precipitation
- Preliminary filtration in drinking water recovery from surface waters and in UV disinfection applications
High hydraulic loads, insufficient tank depth and poor settling behaviour of the activated sludge are the most common causes for the poor performance of secondary clarifiers. Frequently, secondary clarifiers are even unable to reliably ensure the solids retention required. Overflow of flocks increases COD, BOD and phosphorus loads in the effluent and receiving watercourse with the result of higher wastewater fees.
A subsequently installed filtration system is a quick, efficient solution in order to achieve separation of suspended material, such as sludge flocks. Combined with preceding precipitation and flocculation a micro screen provides an easy-to-implement means for the reduction of phosphorus in effluents to very low concentrations. This prevents eutrophication of waters and excessive growth of algae and water plants.
HUBER Disc Filter RoDisc®
28 HUBER Disc Filter RoDisc® units with 24 discs each treating about 8.5 m³ wastewater per second
4 HUBER Disc Filter RoDisc® units with 18 discs installed in a concrete tank
HUBER Disc Filter RoDisc® before installation in the concrete tank
HUBER Disc Filter RoDisc® with open cover
HUBER Disc Filter RoDisc® completely closed
Backwashing of filter discs with filtrate – no external wash water required
Excellent separation of fine solids from the wastewater flowing through the filter mesh with its small apertures.
Design and Function
Our HUBER Disc Filter RoDisc® is a filtration plant and consists of up to 35 vertical discs installed on a horizontal shaft. Up to 65% of the disc surface is submerged in the filtrate during operation.
Each filter disc consists of 12 individual plastic segments equipped with two filter plates each. The filter plates are covered with filter mesh on both sides. A thermal process is applied to fix the mesh. Each segment can be exchanged individually in case the mesh should be damaged. The finest available mesh size is as small as 10 μm.
Due to its small space requirement and modular design the HUBER Disc Filter RoDisc® can be tailored to suit any specific site requirements.
The HUBER Disc Filter RoDisc® is a gravity-flow filtration system. The wastewater to be treated flows into the horizontal shaft and from there through openings into the filter discs which the water passes from inside to outside. The filter discs remain in rest position at first during the filtration process. The solids are retained on the inner disc surfaces, which leads to gradual blinding of the mesh, resulting in an increasing pressure differential. An overflow weir ensures that the water level in the tank remains virtually constant. The upstream water level rises as the blinding process progresses.
When the predefined maximum pressure differential has been reached, the solids are removed automatically from the filter surfaces. The filter material is cleaned by spray nozzle bars. The solids are removed by the slow rotation of the filter discs combined with the high-pressure water jets which wash the filtrate through the mesh from inside to outside without the need to use fresh water as filtrate is used for backwashing. The spray water and the solids contained are collected in a trough and discharged axially from the machine. The filtration process runs on continuously whilst the filter discs are being cleaned.
The Applications of the HUBER Disc Filter RoDisc®
Filtration of biologically treated wastewater
The HUBER Disc Filter RoDisc® is frequently utilised for the separation of fine suspended material from biologically treated wastewater within municipal and industrial applications, especially if secondary clarifiers work insufficiently because they are too small or the settling behaviour of the activated sludge is poor for example. Our HUBER Disc Filter RoDisc® reliably achieves effluent values which are significantly better than the required limit values for filterable solids. Furthermore, it achieves a further significant reduction of phosphorus concentrations.
Filtration to protect or increase the efficiency of downstream treatment systems
A virtually solids-free flow is a prerequisite for effective and efficient as well as trouble and maintenance free operation of some subsequent treatment steps, such as UV disinfection or membrane filtration. Our micro screens significantly reduce the concentration of suspended material. Investment and operation costs are more than compensated because micro screening saves money for downstream systems.
Treatment of water and wastewater in industries
Due to new legislation concerning direct or indirect wastewater discharge, advanced wastewater treatment at source is required. Removal of solids is also required for wastewater recycling because service and process water must be virtually solids-free.
Special applications:
- Wastewater within paper and pulp industry
- Wastewater within plastic processing industries
- Treatment of service and process water, closing water loops (e.g. in food and chemical industry)
- Removal of microplastics
The Benefits of the HUBER Disc Filter RoDisc®
- High hydraulic throughput capacity on a small footprint
- Gravity system with low headloss, no lifting of wastewater required.
- Significant reduction of filterable solids, COD, BOD, phosphorus.
- Effluent standards are reliably met. Reduced wastewater discharge charges.
- Form-locked and chemical-resistant thermal fixation of the mesh.
- No external water supply required as filtrate is used for cleaning.
- For installation within a stainless steel tank or in customer‘s concrete tank.
- Continuous operation even during backwashing.
- Simple individual filter element replacement without the need for lifting equipment.
Media
Videos and Animations
Downloads
Customer Information and Documents
FAQ
