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[...]Classifying and washing in one system Reduced disposal costs Low investment costs Over 90% separation efficiency of grain size > 0.2 mm Reduction of organic content to < 5% Also suitable for classified grit trap material from biogas plants The Grit Washer RoSF G4E combines continuous separation and washout of contaminated grit trap material in one plant. Design and function Grit classifying Sediments from the grit trap are introduced in the upper part of the plant as a mixture of grit, organics and water. Due to the low surface overflow rate virtually all particles are separated and accumulate in the bottom part of the tank. Grit washing Due to the introduction of service water in combination with a slowly rotating circulation system the lighter organic particles can easily be separated from the dense mineral particles in the bottom part of the tank. After removal of the organic material the clean grit is auto-matically removed by a screw conveyor, at the same time statically dewatered, and discharged into a container. The removed organics are continuously discharged with the introduced wash water. The benefits of the HUBER Grit Washer RoSF G4E Reduced disposal costs Reduced water consumption below 2 m3/h Surface overflow rate < 25 m/h 90% separation efficiency of grain size > 0.2 mm Reduction of organic content to ≤ 5 % Dry residue in washed grit > 90% Screened wastewater can be used as wash water Two plant sizes available (8 l/s and 16 l/s throughput) Optionally available as a classifier with wash function Also suitable for classified grit trap material from biogas plants[...]

[...]Reduced disposal costs Less than 3 % organic content Very high solids content of > 90 % Easy to retrofit after existing grit classifiers Conventional grit separation Conventional grit classifiers separate virtually all solids contained in the grit trap effluent. This classified and partly dewatered grit is usually more or less contaminated with organic particles. Subsequent grit washing The classified grit is therefore further treated in the subsequent grit washer where the organics are separated from the mineral particles. Design and Function Due to a defined introduction of upwardly directed service water the grit situated in the lower part of the HUBER Grit Washer RoSF4 T will be fluidised in flow, i.e. a grit fluidised bed is generated. Within this fluidized bed the lighter organic particles are separated from the dense grit particles, independent of the particle size. 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 removed organics are automatically discharged with the introduced wash water. The Benefits of the HUBER Grit Washer RoSF4 T Reduced disposal costs Dewatering of washed grit to approx. 90 % dry residue Organic content reduction to < 3% loss on ignition Throughput capacity up to 3.0 m³ solids per hour Low investment costs For easy installation subsequent to grit classifiers, complete plants, circular grit traps Grit removal screw supported on both ends for long life High corrosion protection[...]

[...]Energy recovery from wastewater Modular design Developed for use with all types of wastewater Not easily affected by coarse and floating material Odour-tight Low maintenance requirements Self-cleaning Right below the ground, in sewers, is a hidden and seldom used source of energy: our wastewater. Generally the temperature of sewage is in the range of 12 to 20 °C. Even during winter the wastewater temperature never drops below 10 °C, or only for a few days. This makes wastewater an excellent heat source for the operation of heat pumps. As a link between the wastewater and heat pump, a heat exchanger is required to extract the heat energy contained within the wastewater: The HUBER Heat Exchanger RoWin transfers the thermal energy from the wastewater to the heat pump. Up to 80% of the useful heat can be recovered from the wastewater and utilized economically. Utilisation of wastewater as a heat source is especially suitable to be applied in large buildings, such as nursing homes, hospitals, schools or swimming baths. It is also possible to recover heat from the effluent of sewage treatment plants and use it e.g. for sludge drying. Design and Function The HUBER Heat Exchanger RoWin consists of a welded stainless steel construction in which horizontal pipe modules are arranged in parallel. The pipe modules are made of stainless steel to achieve maximum heat transfer efficiency. The pre-screened wastewater flows through the heat exchanger and, via the compactly arranged pipes, gives off its thermal energy to the cooling water. The energy for the heat pump is supplied through the heated cooling medium. Due to the specific chemical-biological properties of wastewater a biofilm is developed over time on the heat transfer surfaces that significantly impairs heat transfer. Preventive cleaning of the heat transfer surfaces with an innovative, fully automatic cleaning mechanism therefore is applied to ensure the maximum heat transfer capacity is permanently maintained. Sediments and solids settling on the tank floor are removed by a screw conveyor and returned to the sewer along with the cooled wastewater. Due to the enclosed tank design and return of solids thermal energy is the only emission from wastewater. The HUBER Heat Exchanger RoWin is available, as required, with an outer insulation for particularly exposed sites. Installed above ground, the system offers the benefits of easy maintenance and operation. Due to its modular design the HUBER Heat Exchanger RoWin can be tailored to suit specific site requirements. In combination with a heat pump up to several hundred kilowatts of thermal output can be generated, depending on the unit size. With the optimal combination of both systems municipalities or industrial enterprises can cover up to 80 % of the heat required from wastewater as energy source. Version for Concrete Tank and Channel Installation: HUBER Heat Exchanger RoWin C The HUBER Heat Exchanger RoWin C can be used for installation in the outlet of the wastewater treatment plant or in buffer tanks. Installed directly in the wastewater flow, the heat exchanger modules are optimally surrounded by the flow. Due to the biological processes taking place, the temperature of effluents from sewage treatment plants is on average by 1 K higher than the inlet temperature. Furthermore, higher amounts of thermal energy can be extracted from WWTP effluents than with heat recovery plants installed in sewer systems. The biological processes in the sewage treatment plant are not impaired and the introduction of the cool WWTP effluent outlet is beneficial for the flowing water biology. In addition, temperature and oxygen conditions in the waters are significantly improved. If installed in the channel, no additional pumps are required as the wastewater flow normally runs off by gravity. This avoids costs and significantly improves the economic efficiency of such plants. Especially with regard to the energetic rehabilitation of wastewater treatment plants, the HUBER Heat Exchanger RoWin can make a decisive contribution. Due to its compact design and installation in a channel or tank, no additional installation space is required and the available space utilised at an optimum. But biofilm growing on the heat exchanger surfaces cannot completely be ruled out with the use of the WWTP effluent. Integrated cleaning of the heat transfer surfaces therefore is of great importance to continuously maintain the maximum heat transfer capacity. Several HUBER Heat Exchanger RoWin C units can be installed in parallel or in series for perfect adjustment to specific site conditions and customer requirements. Combined with load-bearing covers the units can also be installed under parking areas for example. The Benefits of the HUBER Heat Exchanger RoWin and RoWin C Compact, enclosed tank design Continuous maximum heat transfer capacity Stable hydraulic conditions Fully automatic operation, minimum maintenance requirements Unsusceptible to grease, floating and coarse material Automatic removal of sediments Modular design for tailored solutions that meet the customer’s specific requirements Various possible applications in both the municipal and industrial field[...]

[...]HUBER Screw Conveyor in a lidded trough Transport of coarse, fine and compacted screenings, sludge, grit, and solids from industrial processes HUBER Screw Conveyors Ro8 T are installed for horizontal or inclined transport of screenings, dewatered sludge, grit etc. from wastewater treatment plants, or other solids from industrial processes. The entire process of material transport takes place within a lidded trough. Gentle movement in an enclosed pipe prevents odor nuisance and dust development. Design and Function The HUBER Screw Conveyors are custom made for the individual product to be conveyed and designed and manufactured with state-of-the-art techniques. Due to their special design principle the conveyors can be equipped with either a push or pull drive and feed hoppers or discharges can be added if required. Direct screenings transfer from one to the other screw conveyor is no problem. The trough version Screw Conveyor Ro8 T with its sturdy design and corrosion-free stainless steel components has plastic bearing shells that are fixed inside the trough. The equal distribution of the screw force over a defined cross-section minimizes bearing shell wear and reduces maintenance costs. The modular design permits easy disassembly. Screw lengths up to 30 m for throughputs from 1 m³h to 12 m³/h are available with a screw installation angle of 45°. Model variations HUBER Double Screw Conveyor Ro8 T2 The HUBER Double Screw Conveyor Ro8 T2 is designed horizontally or at an angle and in different screw diameters depending on the desired delivery rate. The double screw conveyor is used for transport of screenings and dewatered sludge from wastewater treatment plants, or other waste from industrial processes. The entire transport process takes place in two troughs, which are filled with conveyed material by a double trough guide. Gentle movement in an enclosed pipe prevents odour nuisance and dust development. The HUBER Double Screw Conveyor Ro8 T2 is custom made for the individual product to be conveyed and designed and manufactured with state-of-the-art techniques. HUBER Screw Conveyor Ro8 TC as Distribution Screw The HUBER Screw Conveyor Ro8 TC is used Screw Conveyor Ro8 TC for the transport and distribution of dewatered sludge, e.g. after the HUBER Screw Press Q-PRESS®. The screw conveyor is designed with a swivelling system to enable the sludge to be distributed into several containers. A swivelling chute is fitted at the end of the screw conveyor to ensure that the cone is evenly distributed. The entire process of material transport takes place within a lidded trough. The HUBER Screw Conveyor Ro8 TC is custom made for the individual discharge situation and designed and manufactured with state-of-the-art techniques. The Benefits of the HUBER Lidded Trough Screw Conveyor Ro8 T Installation angle Depending on application and layout, a screw installation angle up to 45° can be realised. Completely made of stainless steel The machine is completely made of stainless steel and pickled in an acid bath which eliminates corrosion and thus reduces maintenance. Enclosed system Gentle movement in an enclosed pipe prevents odor nuisance and dust development. Outdoor installation For outdoor installations, the Screw Conveyor can be supplied with a frost protection, combined with an additional insulation if required. Low maintenance No lubrication. Regular checking and visual inspection are sufficient.[...]

[...]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)[...]

[...]In September 2015, new standards went into force which for the first time refer explicitly to manhole covers made of stainless steel: DIN EN 124-3:2015-09, manhole tops and gully tops for use in vehicular and pedestrian areas Compared to the previous DIN EN 124, several additional tests have been added, such as: Securing of the cover / grating within the frame Skid resistance test Tipping behaviour test, etc. From 2017 on at the latest, relevant products must comply with the new DIN EN 124 standards. Since the transitional period has begun already, it is recommendable to prepare tender specifications in compliance with the new standards already now. We as a manufacturer and exporter of manhole covers have made ourselves familiar with the new situation at an early stage already and have meanwhile transferred all new regulations to all our products. In August 2016, our manhole cover type SD7 was therefore tested to the requirements of DIN EN 124-3:2015-09 by MPA Bremen (German institute for materials testing). HUBER manhole covers SD7 now comply with the latest standards and regulations and thus provide maximum security. Due to our many years of experience in processing stainless steel combined with the final surface treatment in a pickling bath for passivation, HUBER products also guarantee maximum ageing resistance. Do not hesitate to contact us![...]

[...]With integrated screenings washing and compaction For channel installation or supplied in a tank With optional frost protection for outdoor installation Both municipal wastewater treatment plants and industrial applications require mechanical treatment as a first treatment step to remove as much as possible of the floating, settling and suspended material. The aim is to achieve the maximum separation efficiency under the prevailing hydraulic conditions. Operating reliability, efficiency and hygienic operation are important factors for a mechanical separation plant. The HUBER Micro Strainer ROTAMAT® Ro9 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 or perforation and screen size (up to 700 mm screen basket diameter), the throughput can be individually adjusted to specific site requirements. The HUBER Micro Strainer ROTAMAT® Ro9 is completely made of stainless steel and acid treated in a pickling bath. The screen can be installed either directly in the channel or in a separate tank. Design and Function Whilst the wastewater flows in through the open front end of the screen basket and through the screen bars or perforations, solids are retained by the screen basket, whereby the separation of floating, settling and suspended solids is dependent upon the screen bar spacing or perforation size. 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 machine starts to operate when a certain upstream water level is exceeded due to screen surface blinding. A robust stainless steel screw removes the screenings from the screen basket surface. Additional cleaning is achieved by wear-resistant brushes fitted to the screw flights. The screw conveyor transports the screenings through a closed and inclined pipe. Whilst the screenings are transported, the screw conveyor dewaters and compacts them without any odour annoyance prior to discharging them into the customer‘s container or a subsequent conveying unit. The HUBER Micro Strainer ROTAMAT® Ro9 is completely made of stainless steel and acid treated in a pickling bath. The screen can be installed either directly in the channel or in a separate tank and also available with optional frost protection for outdoor installation. Product variants HUBER Micro Strainer ROTAMAT® Ro9 XL with an extended screen basket The HUBER Micro Strainer ROTAMAT® Ro9 XL version with an extended screen basket for a higher throughput is especially suited for narrow and deep channels. The long screen basket (400/500 mm diameter) is able to handle greatly varying dry weather and stormwater flows. Extended screen basket available in two lengths Size 400 and 500 For greatly varying inflows Maintenance-free lower ceramic bearing HUBER Micro Strainer ROTAMAT® Ro9 EC The HUBER Micro Strainer ROTAMAT® Ro9 EC is a low-cost version of the HUBER Micro Strainer ROTAMAT® Ro9 with the following special features: Best cost/performance ratio No additional wash water required due to the reduced screenings compaction For installation directly in the channel or in a tank Size 300 and 500 Wedge wire screen basket or perforated plate basket available The Benefits of the HUBER Micro Strainer ROTAMAT® Ro9 Low investment costs Quick and easy installation, even as a retrofit Reliable self-cleaning of the screening area by means of the stainless steel screw flights and wear-resistant brushes All stainless steel construction, therefore virtually unlimited life and no maintenance Encapsulated, odour-free plant Low disposal costs due to integrated screenings washing and compaction Optional frost-protected unit for outdoor installation – No building required[...]

[...]Pöndorf, Austria Pöndorf, located in western Upper Austria, is home to a historical landmark: the former border wall that marked the boundary between Bavaria and Upper Austria for 342 years, from 1437 to 1779. The Maier butcher's shop is also a Pöndorf landmark, renowned for its excellent products throughout the country for generations. It already had two mechanical wastewater pre-treatment systems, one of which was for livestock truck wash water. Unexpected sediment accumulation During the last aeration tank inspection, the municipal sewage treatment plant in Pöndorf, with a capacity of 7,850 PE, discovered that there was an unexpectedly large amount of organic sediment in the flow-calmed zones. The origin was quickly clarified due to its consistency. HUBER, also the supplier for the municipal wastewater treatment plant, was invited to assess the situation and make a proposal. Problems with pre-separation due to inadequate technology One problem was the pit from which the chip-water mixture was sucked by a self-priming wastewater pump and pumped into a drum screen with 3 mm perforations. This screen did not have a system for continuous screen surface cleaning. This often led to overloading of the screen surface, which resulted in water in the screenings on the one hand and the conveyor belt being washed off by the overflow on the other. It flowed into the drain, causing chips to enter the sewage treatment plant with the domestic wastewater. The suction area of the pipe or pump was often clogged with ropes or large solids. The solution: collaboration with HUBER The retired house and farm manager Friedl Lixl came up with the concept together with the HUBER sales team, and the boss agreed to his recommendation. They decided to bypass the pit and use the natural slope — the butcher's shop is located on a hillside — and lay a direct feed line from the slaughterhouse, which is situated one floor above, to the HUBER Micro Strainer ROTAMAT® Ro9. Technical implementation The Ro9-400 Micro Strainer with 1 mm bar spacing, installed in the inlet tank and supplemented by a cross conveyor screw for the screened material, is located in the frost-proof area of the lorry garages without affecting the lorry parking space. Trouble-free operation, sustainable success HUBER was able to provide references from livestock truck washes (medium-sized companies know each other) and also present credible technical arguments. The malfunctions are now a thing of the past and the Micro Strainer ensures excellent operation. Is this topic also of interest to one of your customers? Give us a call.[...]

[...]Very high screenings discharge capacity Low headloss Low installation height above ground level even in deep channels Control-independent safety system The HUBER Multi-Rake Bar Screen RakeMax® is perfectly suited to serve both municipal or industrial wastewater, and process water screening. The cleaning elements, attached to the chain system, can easily be adjusted to different requirements. As the cleaning elements can be variably adapted, the screenings removal capacity is then adjustable. This is especially favourable for high solids loads. The cleaning elements, consisting of the rake and comb plate, are screwed and thus independently replaceable. Due to its different design options the RakeMax® covers a very wide range of applications, allowing us to respond to the individual needs of our customers and to specific constructional and hydraulic site conditions. Function of the HUBER Multi-Rake Bar Screen RakeMax® Due to the specific design of the RakeMax® screen its height above floor is very low and, even in case of deep channels, only dependent on the installation height of the downstream screenings transport or washing system. Both ends of the cleaning elements are connected to drive chains. Each chain is driven by a sprocket on a common shaft and a flange mounted gear motor. Furthermore, defined meshing of the cleaning rakes with the bar rack ensures high operating reliability. An electro-mechanical overload protection system (spring assembly with deflection monitoring) reliably ensures that the process is interrupted when the preset overload is reached, or in case of a blockage. Model Variants and Options RakeMax® J The RakeMax® J screen is a modified version of the proven HUBER RakeMax® screen. In contrast to the standard RakeMax® design version, the RakeMax® J screen does not have straight bars, the screen bars are bent in the bottom section, i.e. curved towards the sewer base. It is also this special form of the screen bars which gives the screen its name as the letter ‚J‘ has approximately the same shape as the curved screen bars. The screen rake moves along the curvature of the screen bars and describes a segment of a circle in this section. The flat inclination angle of the screen bars in the sewer base section increases the cross-sectional flow area of the screen with the result of reduced hydraulic losses and a reduced flow velocity in the gaps between the screen bars. RakeMax® HF The RakeMax® HF excellently combines the advantages of the well-proven RakeMax® with the positive properties of a screen with a bar rack that is installed with only a small inclination. The RakeMax® HF has a L-shaped design with two different screen sections: The flat bottom section provides a large screening surface and favourable hydraulic conditions, the steep conveying section ensures screening on a small footprint. Due to the extremely flat installation of the bar rack of 30° the screen section through which the flow passes is always double the depth of the approaching flow. Material removal from the screen starts virtually right at the bar rack mounted flat to the channel bottom so that any accumulation of disturbing material is eliminated. The optimal approaching flow conditions and large effective bar rack surface ensure a high hydraulic throughput capacity. RakeMax® Hybrid The special feature of this type of screen is a bar rack that is manufactured from highly wear-resistant fibreplastic composite. By adding materials like glass fibre or resins for example the profile bars are made suitable for applications with high mechanical loads and excel for their very high stability, deformation resistance and resistance to wear. Due to their high breaking elongation and elastic energy absorption the profiles retain their shape even under mechanical load, are highly flexible and return to their original shape. They also excel with a very high production precision, size accuracy and form stability so that even smaller bar spacings can reliably be maintained. Another advantage of the RakeMax® Hybrid screen are the individually replaceable screen bars for quick and safe handling without the need for welding work. Safety Vision The innovative HUBER Detection System Safety Vision enables the screen to "see" the screenings and reliably identify potentially critical contaminants. This effective protection mechanism reliably prevents damage to the screen or the downstream equipment, which not only increases the availability of the machines involved, but also improves the operational safety of the entire plant technology. In addition, the adaptive operation based on event detection means that the machine can always be optimally utilised and the running time of downstream machines can be optimised according to the actually necessary demand. The benefits of the HUBER Multi-Rake Bar Screen RakeMax® Very low headloss – high separation efficiency Defined meshing of the cleaning rakes with the bar rack ensures a high operating reliability. Screen installation possible without a bottom step Compact design with a low installation height above ground level Completely odour-encased screen with easy to remove covers Easy-to-retro fit into existing channels, installation without channel recesses possible The screen consists of a self-supporting folded stainless steel profile so that it can easily be lifted out of the channel. Not hindered by gravel or grit Simple and easy-to-access chain tensioning unit All parts in contact with medium (except the chain, pinion, drive and bearing) are made of immersion pickled stainless steel, optional stainless steel chains and chain wheels. High screenings discharge capacity through adjustable cleaning elements Independently replaceable rake and comb plates Automatic scraper mechanism, no service water required[...]

[...]Increased separation efficiency through flow deflection in the bar rack Optimal hydraulic utilisation of existing channels Unsusceptible to grit, gravel and stones The HUBER Multi-Rake Bar Screen RakeMax® CF is perfectly suited to serve both municipal or industrial wastewater, and process water screening. Due to its different design options the RakeMax® CF covers a very wide range of applications, allowing us to respond to the individual needs of our customers and to specific constructional and hydraulic site conditions. Design and Function The HUBER RakeMax® CF consists of a U-shaped stationary bar rack installed between the two screen frames, parallel to the flow direction of the wastewater. Whilst the wastewater flows into the open front side of the screen and out through both the left and right bar rack, solids are retained on the inner surface of the U- shaped bar rack. The solids retained on the bar rack lead to gradual blinding of the bar rack surface which has an impact on the level difference in the channel. Cleaning of the screen bars starts at a defined water level in the channel upstream of the screen. The RakeMax® CF achieves this with its cleaning elements attached to the chain system. The discharge capacity can be adjusted to individual requirements as the number of screening elements attached to the chain system is variable. Due to the specific design of the RakeMax® CF screen its height above floor is very low and, even in case of deep channels, only dependent on the installation height of the downstream screenings transport or washing system. If the screen operation is blocked, an electric control reliably protects the screen against damage caused by overload. At the end of the bar rack cleaning cycle the rake is positively cleaned by a pivoted comb which reliably discharges the removed screenings into a downstream transport or disposal unit. The easy to access and maintain drive unit is installed above the channel. The benefits of the HUBER Multi-Rake Bar Screen RakeMax® CF Increased separation efficiency through flow deflection in the bar rack Integrated emergency overflow Optimal hydraulic utilisation of existing channels Very low headloss – high separation efficiency Defined meshing of the cleaning rakes with the bar rack ensures a high operating reliability. Screen installation possible without a bottom step Compact design with a low installation height above ground level Completely odour-encased screen with easy to remove covers Not hindered by gravel or grit Easy-to-retrofit into existing channels, installation without channel recesses possible The screen is a sturdy self-supporting stainless steel construction and therefore can easily be lifted out of the channel. Simple and easy-to-access chain tensioning unit All machine components in contact with the medium are made of stainless steel and acid treated in a pickling bath (except chains, pinions, drives and bearings). The chains and chain wheels are optionally available in stainless steel. High screenings discharge capacity through a variable number of screen rakes Automatic scraper mechanism, no service water required[...]