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[...]Grit classifying and grit washing in a single and compact unit Reduced disposal costs Utilisation of the Coanda effect ensures high grit removal efficiency. Less than 3 % organic content High solids throughput More than 2,000 installations worldwide The HUBER Coanda Grit Washer RoSF4 combines grit classifying and grit washing in a single and compact unit. By using the Coanda effect the process of classifying can be combined with the process of sorting to ensure a continuously high separation efficiency and outstanding washing performance. Design and Function Classifying with the Coanda Effect A mixture of grit, organics and water is fed through a vortex chamber where a fast spinning rotational movement is generated. The mixture then flows down through a trumpet-shaped Coanda Tulip. The flow is diverted along the curved inner surface of the Coanda Tulip by the Coanda effect that a liquid flow is adhering to the contour of a curved surface. The flow is thus smoothly, without generation of eddies, diverted from a fast rotating vertical direction to a gradually slower rotating horizontal direction. There is a high flow velocity along the inner surface of the Coanda Tulip, a moderate radial velocity underneath the water surface and the again high velocity at the weir. The solids contained in the flow (grit particles, organic material) are then separated due to the flow diversion combined with flow velocity reduction, dependent upon the particle settling velocity, and sink down to the bottom portion of the tank. The excellent flow pattern in the HUBER Coanda Grit Washer RoSF4 leads to a > 95 % separation of 0.20 – 0.25 mm diameter grit particles. The separation degree depends on the settling velocity of the solids to be separated (due to the influence of particle density and size) so that also organic material will be separated. Fluidised bed for outstanding grit washing The separated grit is then washed, i.e. attached organic matter is separated from the mineral grit particles. This takes place in the bottom portion of the HUBER Coanda Grit Washer RoSF4 where a fluidised grit bed is generated. Wash water is fed into a bottom chamber that is separated from the grit washer tank by a perforated plate and a perforated rubber diaphragm. The wash water flows upwards through the diaphragm and is evenly distributed over the bottom of the tank thus generating a fluidised grit bed. Within the fluidised bed the grit particles rub against each other thus removing organics from their surfaces. This process is supported by the central stirrer keeping the particles in motion. After removal of the organic material the clean grit is removed through a classifying screw, statically dewatered and discharged into a container. The organic material left in the HUBER Coanda Grit Washer RoSF4 is removed from the plant also automatically but discontinuously, depending on the entire process, so that a defined separation capacity is constantly available. The benefits of the HUBER Coanda Grit Washing Plant RoSF4 No additional preceding screening required (e.g. < 4 mm) High grit and gravel yield Suitable for treatment of grit from sewers, gully waste, road sweepings No crushing of stones and gravel inside the plant The screw is supported on both ends for minimized wear. Optional grit removal even during grit feeding due to on-line grit level measurement Encapsulated, odour-free plant Separate organics discharge allows for separate further treatment of organics Large diameter screws for a high solids throughput Stainless steel stirrer and screw More than 2,000 installations worldwide give proof of customer satisfaction Easy to integrate into complete treatment processes Up to 3 m³ solids throughput per hour[...]

[...]Utilisation of the Coanda effect ensures high grit removal efficiency Partly reduced organic content of the grit Maximum corrosion resistance and wear protection Grit classifiers are widely used on sewage works for the removal of grit. Flow conditions ideal for maximum grit removal based on scientific definition have until now been unobtainable. Previously designed plants based on past experience have often suffered from grit carry over due to insufficient retention time caused by undersizing of plant (consequence: deposits in digester, high wear rate of pumps) or conversely classified grit with a high organic content due to oversizing of plant. Consequence: high disposal costs, and wet grit due to insufficient dewatering. The HUBER Coanda Grit Classifier RoSF3 was developed by HUBER in cooperation with the University of Munich, hydraulics department. Based on the Coanda-Effect, the flow into the tank can be defined exactly and simulated mathematically. When operating at optimum flow, the grit separation is up to 95 % (grain size 0.2 mm). Design and Function The difference in density between grit and other organic components can partly be taken into consideration to ensure reduced organic contamination and thus static dewatering of the classified grit. High efficiency has enabled the HUBER Coanda Grit Classifier RoSF3 to be significantly smaller than conventional classifiers. The grit / water mixture flows either by means of a pump or by gravity into the vortex chamber where a rotary motion is induced. An automatic air intake takes place through the centrically located drilling hole on the vortex chamber. The heart of the HUBER Coanda Grit Classifier RoSF3 is the inserted Coanda Tulip. The organically laden water flowing in from the top adheres to the tulip wall and is diverted to the horizontal below water surface by the Coanda-Effect. Reduced radial and tangential flows assist the separation process and the difference in density between organic and mineral material is partly taken into consideration. The classifier screw transports the clean grit up an inclined plane where it is dewatered under gravity before discharge into a skip. The mineral residue from a plant operating under optimum conditions is in excess of 90% (e.g. a plant with appropriate pre-screening and grit collection facilities). The benefits of HUBER Coanda Grit Classifier RoSF3 High levels of grit separation of 95 % of grain size 0.20 - 0.25 mm Screw supported on both ends for minimised wear High corrosion resistance Encapsulated, odour-free plant Option of frost-proof design[...]

[...]High grit separation through tangential feed introduction at bottom level High throughput capacity of up to 3,000 l/s (10,800 m³/h) Worldwide well-proven, reliable technology Grit separation from wastewater helps prevent operational problems such as grit sedimentation, increased wear and blockages. Design and Function Grit separation with the HUBER Vortex Grit Chamber VORMAX starts already in the inlet channel to the grit trap. Like in an unaerated longitudinal grit trap the grit sinks downs to the channel bottom from where it is transported into the circular grit trap along with the wastewater flow. A tangential rotational movement is generated due to the curved design of the (mostly concreted customer’s) concrete tank. A constantly rotating stirrer helps support the wastewater circulation within the grit chamber ensuring a constant velocity of rotation within the complete grit trap system even with greatly varying hydraulic conditions. Due to the constant radial rotation, caused by a secondary flow near to the bottom, the solids are very quickly collected within the centre of the grit chamber from where thy then pass into the bottom of the grit collection tank. The grit-free waste- water then exits and flows onto the next treatment step. Centrifugal or airlift pumps can then deliver the collected solids from the grit collection tank into a grit classifier or grit washer where the solids can then be subsequently separated and dewatered and organic particles removed. Benefits of the HUBER Vortex Grit Chamber VORMAX Compact, space-saving design High grit separation efficiency Low energy demand Throughput capacity up to 3,000 l/s (10,800 m³/h) Low pressure loss Variable inlet and outlet arrangement Minimum wear, reduced maintenance Optional subsequent grit washing[...]

[...]High grit separation efficiency through tangential wastewater inflow Optional with integrated grit classifying screw Compact, space-saving unit Stainless steel tank design Applications Wastewater treatment plants Process water treatment Solids / liquid separation in general Design and Function Separation of the grit particles in the HUBER Circular Grit Trap HRSF is supported by the rotational motion of the wastewater. The separation effect is generated by overlapping of the vertical downward motion and a developing centrifugal force acting on the individual grit particles. The inner tank surface serves as the separation area. To increase the separation area, the HUBER Circular Grit Trap HRSF has an additional separation cone for a reliable maximum separation performance. For improved separation of organics from grit, the option for air intake via an aeration system is provided. Organic components are kept floating and are discharged with the water flow above the separator cone. The separated solids are removed from the plant either directly by means of an integrated classifying screw, or pumped into a grit classifier. The layout of the HUBER Circular Grit Trap HRSF was made on the basis of numeric design engineering and tested and verified under practical conditions in collaboration with the German test institute LGA. Benefits of the HUBER Circular Grit Trap HRSF Maximum separation efficiency due to additional separation area (separator cone) Throughput capacity up to 150 l/s (540 m³/h) Compact, space-saving unit Encapsulated, odour-free plant Completely made of stainless steel for high corrosion resistance Optional with integrated grit classifying screw Optional with scum separator and aeration[...]

[...]High separation efficiency of up to 75 μm Small footprint Integrated floating material separation Ideal for high grit loads The new HUBER Grit Trap GritWolf® is different from space-consuming aerated grit channels as it consists of an aerated and an unaerated grit trap chamber. Applications: New wastewater treatment plants Grit trap refurbishment Pre-treatment for membrane bioreactors (MBRs) Design and Function In the first smaller chamber of the HUBER Grit Trap GritWolf® the wastewater is exposed to medium-bubble aeration. Floatable particles rise to the water surface where they accumulate and are removed by a paddle system just before the outlet. The second chamber is unaerated and equipped with lamella units. Due to the deep flow approach and the advantages of a lamella separator, the GritWolf® reliably removes even very fine grit. The grit trap tank is usually made of concrete, stainless steel tanks are however available as an option for smaller plant sizes. The GritWolf® can also be integrated into existing grit trap chambers. The horizontal grit conveyor, the lamella packages and the paddle system for grease removal are manufactured from corrosion-resistant material. The grit is removed axially from the HUBER Grit Trap GritWolf® by a time-controlled horizontal screw conveyor. Even large ‘sand dunes’ occurring under stormwater conditions (stormwater flushes) are therefore evenly dosed into the suction area of a grit pump. The grit pump delivers the grit-water mix into a HUBER Coanda Grit Washer RoSF4 that produces clean grit in a proven way, thus perfecting the entire grit treatment system. Benefits of the HUBER Grit Trap GritWolf® 95% separation of particles size ≥ 75 μm Small footprint and space-saving compact design Low pressure loss Regulated supply of grit to the grit pump by horizontal screw conveyor Floating material separation with automatic forced removal (option) < 3% loss on ignition with downstream grit washing[...]

[...]Designed in accordance with DWA standards or customised design Available with or without aeration Optional separate grease chamber with automatic grease removal Manufactured entirely in stainless steel Grit separation from wastewater will prevent operational problems, such as grit sedimentation, increased wear, and blockages. Design and Function Grit separation The grit trap design and dimensioning are fully compliant with DWA recommendations or according to customer requirements. The grit trap is available as an aerated or unaerated unit. The decision on when to use the aerated or unaerated option is for example the specific ratio between the storm and dry weather flow and if any further grit treatment facilities are installed or planned. Grit removal The horizontal grit conveyor transports the separated grit particles to the inclined grit removal screw installed within the grit trap. The inclined screw dewaters and discharges the compacted material into a container or a subsequent HUBER Coanda Grit Washer RoSF4 T . Optionally, the material can be pumped to the grit washer. Grease separation and removal 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. Contrary to many competitors’ systems, the HUBER Longitudinal Grit Trap ROTAMAT® Ro6 provides forced transport of the grease separated on the water surface within the grease chamber into the grease collection tank. Forced grease transport is ensured by an integral grease removal paddle that consists of a guided scraper which reliably removes the grease layer from the grease chamber. The grease removal paddle further ensures complete grease removal over the full grit trap length preventing a digestion process that would normally be associated with improper grease removal. 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. The benefits of HUBER Longitudinal Grit Trap ROTAMAT® Ro6 Separation efficiency at Qmax: 90 % capture rate of max. grit particle size 0.20 – 0.25 mm (confirmed by the University of Erlangen) Throughput capacity up to 300 l/s (1,080 m3/h) Optional separate grease chamber with automatic grease removal Completely encased unit Installation above ground or below ground Optional integrated grit washing Completely made of stainless steel (including the screws)[...]

[...]Thickening of municipal and industrial sludges Compact, enclosed design Efficient, reliable and easy to operate Low operation and maintenance costs More than 700 installations worldwide prove the reliability of theHUBER Rotary Screw Thickener S-DRUM. Thickening results > 7 % DR are achieved in typical municipal applications with a polymer consumption of 3 - 5 g/kg. Power consumption is only 35 W/m³, spray water demand only approx. 25 l/m³. Different system sizes are available for throughputs from 20 to 100 m³/h per unit. Design and Function A preceding flocculation reactor with stirrer ensures efficient sludge treatment in the HUBER Screw Thickener S-DRUM. The screw thickener consists of a cylindrical wedge section basket which retains the solids contained within the fed sludge. A screw, slowly rotating with variable speed, conveys the solids gently upward through the inclined basket. Water drains through the basket. The degree of thickening is adjustable by means of a height adjustable weir plate in the sludge discharge and the variable screw speed. A rotating spray bar cleans the wedge wire periodically from the outside during screw operation. The benefits of the HUBER Rotary Screw Thickener S-DRUM Sludge volume reduction by up to 80 % Sturdy design for high solids loads and coarse material containing sludge Maximum system availability due to the virtually wear-resistant and clog-free stainless steel wedge section basket High operational reliability due to the slow screw speed Low power and spray water consumption No need for lubrication Completely encapsulated, odour-free plant No vibration Low noise < 68 dB(A)[...]

[...]Very low polymer consumption High throughput capacity Reliable operation The purpose of sewage sludge thickening Sewage sludge, particularly secondary sludge, is charac­terised by low solids concentrations and therefore big vo­lumes. Good sludge thickening is required as a prerequi­site for the efficient further treatment of sewage sludge, for example in digesters, and is also necessary where liquid sewage sludge is transported to further treatment steps or utilisation. The following criteria are decisive for the selection of the thickening process: Efficiency Performance Reliability Design and Function Polymer is added to the thin sludge and the sludge condi­tioned in a flocculation reactor prior to being distributed evenly over the full width of the continuously travelling filter belt. The water filtered through the belt filter cloth drains off into collection troughs whilst the solids are retained on the filter belt. Chicanes furrow the sludge to facilitate drainage and support the production of a concentrated sludge cake. The initial thin sludge volume is reduced by approx. 85 %. The sludge cake is dischar­ged into a collection trough from where it is removed by an eccentric screw pump for example. A spray bar cleans the filter belt while it travels back. The benefits of the HUBER Belt Thickener DrainBelt Efficiency Sludge volume reduction up to > 85% Typical thickening results > 6% DR Minimised polymer consumption, normally only 2 – 3 g effective substance/kg DM Low energy consumption Belt filter cleaning with filtrate water as spray water Reliable technology Long filter cloth life due to the slow filter belt velocity of < 20 m/min Minimised wear of the plastic chicanes Encased thickener suitable for the treatment of strong-smelling sludge, protecting operators against harmful spray water aerosols Big inspection openings to facilitate maintenance Easy to operate and maintain High performance Large active filter surface Very long thickening zone Increased filtration results through repeated sludge restacking Increased thickening results due to a ramp installed to decelerate the sludge prior to being discharged Selectable filter cloth options to meetspecific requirements High specific throughput capacity up to 45m3/h per metre of filter belt width[...]

[...]Automatically cleaned screen for solids retention in stormwater tanks and overflows Efficient solids separation Continuous automatic screen cleaning Defined solids removal For discharges with limited upstream head possibilities Sturdy, low-maintenance stainless steel design During and after storm events large amounts of debris are discharged to streams, rivers and lakes through storm water overflows of combined and sanitary sewer systems. Frequently, even the installation of scum boards is insufficient to prevent such pollution. The polluting items, such as sanitary products, toilet paper, faeces, plastic foils, etc. are not only unsightly but also responsible for considerable cleaning and/or disposal costs. On the basis of the DWA sheet A 102 (an instruction issued by an association dealing with wastewater treatment) efforts to fundamentally improve the protection of waters in this sector have been increased. Particularly endangered receiving water courses and nature preser­vation areas require more extensive measures concern­ing the treatment of stormwater. Design and Function The ROTAMAT® RoK1 screen is the ideal solution for solids retention at stormwater discharges, whether for new structures or refurbishment. The screen belongs to a group of fine screens designed for high flow rates at an extremely low hydraulic resistance. Two-dimensional screening guarantees a very high solids retention combined with automatic, gentle cleaning of the perforated plate. RoK1 screens are horizontally installed at the down-stream side of overflow weirs. A screw flight is mounted on a half cylinder of perforated plate. As the stormwater flows through the horizontal perforated half-pipe of the screen trough the solids are retained. A screw, with a brush attached on its flights, rotates within the semi-circular screen trough. It cleans the screen and pushes the screenings gently towards the end of the trough. At the end of the trough, the screenings are returned into the sewer and carried to the wastewater treatment plant. Alternatively, the screenings are removed from the plant with a cross conveyor for further disposal. During storm conditions the screen is automatically started and then works fully automatically. The installation conditions On the left or right side of the weir overflow – standard inclination angles 0° and 60°. To allow far different structural conditions and local hydraulic conditions it is necessary that the screen can be flexibly installed into existing buildings. The full screen surface is available already at the beginning of a storm event so that the hydraulic resistance is minimized with the result of a very high solids retention. The Applications HUBER ROTAMAT® Screens RoK1 can be used for a variety of applications in the combined sewage sector. To avoid another point of maintenance it is generally not intended to remove screenings from the structure. Instead, the screenings remain within the sewer or tank and are introduced into the wastewater treatment plant after the storm event. As a reliable solution for high solids loads and/or unfavourable flow conditions, the HUBER Storm Screen ROTAMAT® RoK1 can be equipped with a cross conveyor to function as a HUBER Storm Screen ROTAMAT® RoK1 TS . The screw conveyor feeds the screenings separated in the storm screen back into the wastewater flow at a specific point. Alternatively, the screenings can be discharged into a container with the cross conveyor if requested by the customer. The Benefits of the HUBER Storm Screen ROTAMAT® RoK1 The screen is installed behind the weir overflow. This design results in the following favourable benefits: Optimal solids retention by means of two-dimensional screening (perforated plate) Low hydraulic resistance due to installation at weir height The perfect solution for discharges with limited up­stream head possibilities Defined screenings discharge For problem-free retrofitting into existing structures Possibility of completely submerging the screen Available with cross conveyor as RoK1 TS if required[...]

[...]Rotating high-performance screening drum for extreme applications Efficient and reliable coarse material separation High solids throughput even with problematic material Forced guided material transport For any type of septic sludge Reliable separation of all disturbing material Dependable and reliable in operation Design and Function HUBER Sludge Acceptance Plant RotaShield® Rotating high-performance screening drum for extreme applications. Reliable, clog-free solids transport through forced guided material transport within the drum. This ensures high solids throughput even with problematic material (wet wipes, grease, stones). Solids washing and dewatering by means of a subsequent screenings wash press, type HUBER Wash Press WAP® . While wash water is added to pre-wash and homogenise the raw material within the HUBER Sludge Acceptance Plant, the perforated plate of the wash drum retains all particles bigger than the perforation, which are dewatered and then discharged into a skip. Since only coarse material according to the perforation is separated, the volume of the resultant residues is vastly reduced with virtually the complete mineral material being further treated in the down-stream HUBER Coanda Grit Washer RoSF4 . The resultant coarse material can then be further separated into a mineral and organic fraction by means of a coarse material washer. The Benefits of HUBER Sludge Acceptance Plant RotaShield® High solids throughput even with problematic material (wet wipes, grease, stones) High hydraulic capacity even with high solids contents Defined separation size due to two-dimensional screening Feeding from a conveyor, through a launder channel or pressure line Solids throughput up to 6 m³/h Completely encased unit Insensitive to coarse material 3 to 100 mm separation size Screened wastewater can be used as wash water Short tanker vehicle emtpying times Optional simultaneous emptying of several vehicles Minimum wear, reduced maintenance Compact, space-saving design Low energy demand High corrosion resistance[...]