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[...]The HUBER Disc Dryer RotaDry® is designed for homogeneous partial drying of dewatered sewage sludge. Due to its compact design and high specific water evaporation, it is ideally suited not only for use in new sewage sludge mono-incineration plants, but also for capacity expansions of existing plants. The dryer can dry exactly to the required DR content, thus enabling self-sustaining combustion in the fluidised bed incinerator. The HUBER Disc Dryer RotaDry® is available in different sizes, so that a water evaporation of two to six tons per hour and dryer can be achieved. The perfect sewage sludge dryer in combination with a mono-incineration plant By using different disc diameters and numbers of discs, the dryer surface can be optimally adapted to the amount of generated sludge and the dryer can be operated in the ideal capacity range. Thermal drying of sewage sludge is an indispensable process component to ensure the sewage sludge has the right dry residue. The subsequent mono-incineration of the sewage sludge achieves an enormous reduction in volume and mass and provides for the recovery of phosphorus. At the same time, the heat required for drying is provided and, depending on the size of the plant, electricity is also generated by means of a steam turbine. A reliable condensate removal system, an innovative concept for moisture control, optimized feeding and a steam control line with minimized pressure loss characterize the HUBER Disc Dryer RotaDry® as the perfect sewage sludge dryer in combination with a mono-incineration plant. New RotaDry® trial disc dryer enables drying of sewage sludge on a pilot scale The project-specific assessment of sewage sludge drying is extremely important to assess risks and optimise process designs. For this reason, HUBER SE decided in 2021 to develop a compact trial disc dryer. Together with its cooperation partner Oestergaard, HUBER downscaled the dryer and adapted the throughput to the size of a test plant. The aim was to design a transportable dryer that can be used for testing purposes at the headquarters in Berching, Germany, as well as for more extensive tests at interested customers' sites. The limiting factor here is the sludge throughput of the dryer, as not unlimited amounts of dewatered sewage sludge can be shipped to Berching for tests. HUBER Disc Dryer RotaDry® in a 20-foot high-cube container The 20-foot high-cube container houses the disc dryer, the feed and discharge screw, a small shell-and-tube condenser and the vapour extraction fan. The HUBER Screw Conveyor Ro8 T units of size 219 are of course "Made in Berching" and have been manufactured directly in HUBER's adjacent production hall. Unlike its large, steam-heated "dryer brothers", the disc dryer is heated with thermal oil. HUBER was able to use an electrically heated thermal oil unit from its stock, which offers advantages over a steam generator, especially due to its easier handling. In addition, a control cabinet is installed in the container, which houses the electrical instrumentation and control (I&C) technology. To operate the dryer, only a 63 A power supply and cooling water are required externally. If you are interested in a customised test with the trial disc dryer, please contact HUBER Sales, Sludge Drying at sludge@huber.de .[...]

[...]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. 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.[...]

[...]Compact, enclosed unit Reliable operation, minimised operator attention Low operation costs High throughput capacity up to 40 m³/h The purpose of sewage sludge thickening Sewage sludge, particularly secondary sludge, is characterised by low solids concentrations and high volumes. Effective sludge thickening is essential as a preliminary step for the efficient treatment of sewage sludge, such as in digesters, and is also crucial when liquid sludge needs to be transported for further processing or utilisation. The following criteria are decisive for the selection of the thickening process: Performance and efficiency Reliable operation Easy maintenance and operation Design and Function A slightly inclined, slowly rotating filter disc covered with a filter cloth separates flocculated sludge from filtrate. A baffle plate distributes the inflow evenly across the entire filter radius. Sludge liquor collects on the bottom section of the filter disc so that a low hydrostatic pressure devel­ops enhancing sludge liquor drain-off. Flexibly supported plows divide and move the sludge layer on the disc and open up furrows so that water can easily drain through the filter cloth, thus enhancing the filtration effect. At the sludge discharge outlet, a scraper pushes the thickened sludge from the disc. The filter cloth is cleaned by a spray bar so that the solids are washed back into the sludge to ensure the filtrate water is clear. Efficiency Efficient use of water The HUBER Disc Thickener S-DISC needs little wash water at a very low pressure anyway but the need for adding external wash water can completely be eliminated by using filtrate for filter cleaning. Saving water resources Reducing the load on local water treatment facilities Reducing operation costs Hydraulic load reduction Virtually no additional demand for electrical energy for pressure increase Specific installation conditions As 80 % of the filter surface of the HUBER Disc Thickener S-DISC are permanently used, a very compact and small machine design is possible. Minimal space requirements for installation Ideal as mobile installation Easy container installation Easy retrofitting No need for foundations or service platforms Variable inlet and outlet arrangement The benefits of HUBER Disc Thickener S-DISC Performance and efficiency Sludge volume reduction > 85 %, Typical thickening results > 6 % DR Low polymer consumption, Specific power consumption < 0.03 kWh/m³ Minimum operator attendance requirements of less than 10 minutes a day Wash water demand < 5 % of sludge throughput Wash water pressure < 3 bar Filtrate water can be used as wash water for the spray bar. Typical separation efficiency > 97 % Reliable operation Robust design Stainless steel filter cloth for long life Slow filter rotation < 5 rpm Low maintenance Easy and safe to operate No need for lubrication Easy access for inspection, maintenance and operation Proven in hundreds of installations Throughput, polymer dose and filter rotation speed can be adjusted to optimise the degree of thickening. Big inspection openings to facilitate maintenance and inspection Encased thickener suitable for the treatment of strong-smelling sludge, protecting operators against harmful spray water aerosols Automatic control technology Suitable for unattended operation over 24 hours per day[...]

[...]Versatile wastewater treatment for numerous industrial applications Compact and modular design for throughputs up to 300 m³/h Simple, reliable saturation system using a multiphase pump Low space requirement due to an integrated lamella separator Suitable for the pre-treatment of industrial wastewater or secondary treatment of municipal wastewater Very high reduction rates for COD, solids and phosphate Combined with a DIGIT-DOSE Chemicals Dosing system up to 30% less operating costs Principle of Flotation: During dissolved air flotation, very fine gas bubbles of 20 ‒ 40 μm are released, which together with the particles present in the wastewater, form an agglomerate. This agglomerate has a lower density than water and rises to the water surface. Nonfloatable particles are separated via conical selection chambers. The particle-free clear water passes through an immersion wall and is then available for further use. If a tube flocculator is installed upstream of the flotation plant, so-called precipitants and flocculants can be added, which improve the clarification performance accordingly. Functional description of the HUBER Dissolved Air Flotation Plant HDF The (waste) water to be treated enters the flotation plant via the tube feeder (1) and is directly mixed with the released pressure water (white water). The micro bubbles (20 ‒ 40 μm dia.) generated when the pressure is suddenly released are brought into close contact with the suspended material in a tube feeder (special pipe-in-pipe system) (14). The gas bubbles attach to the surface of solids. Due to their increased buoyancy, the light aggregates of solids and air bubbles float to the water surface. The blended influent flows upward into the tank of the dissolved air flotation unit where it is evenly distributed over the total tank width. The laminar flow conditions ensure optimum phase separation. The solids/gas flocs rise to the water surface where they form a scum (or flotate) layer that is skimmed off into the flotate hopper (3) by a scraper (2). The scraper joists with their special design dewater the flotate additionally. The flotate is either collected in a container or by an eccentric screw pump delivered to further treatment stages (e.g. sludge dewatering with HUBER Screw Press Q-PRESS) (15). The non-clogging lamella separator (5) increases the effective clarifier area, for maximum hydraulic loads on a small footprint. While the water flows down through the gaps between the inclined lamella plates, buoying flocs rise a short distance and attach at the lower surface of the upper lamella and dense particles sink a short distance to the upper surface of the lower lamella. The lamellae retain thin layers until they are grown into thick and compact layers that finally detach from the surface and slide quickly up or down along the lamella surface. Detached light aggregates slide up and rise to the water surface where they form a floating scum layer. Heavy sludge aggregates slide and sink down to the bottom of the tank into the sediment hopper (6) from where they are either removed by an eccentric screw pump or gravity discharged by means of a pneumatically controlled valve. The clarified wastewater flows behind the baffle plate (7) to an effluent box (8) from where the water falls over a height-adjustable weir into the clarified water outlet (9). Up to 30 % of the effluent is recirculated for the generation of pressure water. A multi-stage centrifugal pump (10) generates a pressure of about 6 bar. In this process, air is introduced into the pump impeller housing and intensively mixed with the water. This pressurized water flows through the pressurized water line (12) to the pressure relief valve of the tank. There, the micro bubbles with a diameter of 20 to 40 microns are generated through pressure relief (13) to ambient pressure. In the tube feeder (14), the micro bubbles thoroughly blend with the influent to be treated so that all solids get in close contact with a sufficient number of micro bubbles. Increased separation efficiency through pre-treatment in a chemical treatment stage Individual project-specific tube flocculator for optimal chemicals dosing Ideal admixture of chemicals due to a flow-optimised design Compact unit directly beside the HUBER Dissolved Air Flotation Plant HDF Accommodating individual preferences for sampling / dosing points / measurement instrumentation Optional integration of the innovative HUBER Chemicals Dosing DIGIT-DOSE for an automatically optimal chemicals dose in real time. Applications of Dissolved Air Flotation HUBER Dissolved Air Flotation Plant HDF units are used for a wide variety of industrial and municipal applications, such as: Slaughter houses Meat processing and packing Fish processing Dairies Convenience food production Gastronomy Disposal companies Soap works Land remediation Chemical industry Petro chemical industry Iron and steel industry Leather & textile industry Cosmetics industry Galvanizing, electroplating Municipal wastewater treatment Activated sludge separation Phosphate after treatment plants Rendering plants Applications HUBER Dissolved Air Flotation Plant HDF units are used for a wide variety of industrial and municipal applications, such as: Slaughter houses Meat processing and packing Fish processing Dairies Convenience food production Gastronomy Disposal companies Soap works Land remediation Chemical industry Petro chemical industry Iron and steel industry Leather & textile industry Cosmetics industry Galvanizing, electroplating Municipal wastewater treatment Activated sludge separation Phosphate after treatment plants Rendering plants[...]

[...]Flotation plant HDF S for high solids loads Flat construction with a large water surface of up to 160 m³/h Simple, reliable saturation system using a multiphase pump Machines can be mounted in standard containers as mobile units Suitable for high solids loads and for activated sludge separation as an alternative to conventional secondary clarification Up to 30% operating costs saving when combined with a DIGIT-DOSE Chemicals Dosing system Principle of Flotation: During dissolved air flotation, very fine gas bubbles of 20 ‒ 40 μm are released, which together with the particles present in the wastewater, form an agglomerate. This agglomerate has a lower density than water and rises to the water surface. Nonfloatable particles are separated via conical selection chambers. The particle-free clear water passes through an immersion wall and is then available for further use. If a tube flocculator is installed upstream of the flotation plant, so-called precipitants and flocculants can be added, which improve the clarification performance accordingly. Design and Function HUBER Dissolved Air Flotation Plant HDF S for the treatment of heavily polluted wastewater In addition to the compact HUBER Dissolved Air Flotation Plant HDF with a separation zone of more than one metre, there is a flat flotation system with a reduced separation zone but larger water surface, the HUBER Dissolved Air Flotation Plant HDF S. The letter ‘S’ stands for sludge, as the plant is able to separate very voluminous and highly contaminated wastewater and sludge in a defined way. Maximum performance is ensured by a very large water surface for reliable flotation and a flow-optimised design of the tank. The contact zone between wastewater and saturated water is followed by a defined flow over the entire width of the tank. The sludge particles can thus rise to the water surface as required. There, they are additionally thickened with special scraper joists and then removed with a chain scraper in the direction opposite to the direction of the flow. Remaining sediment and heavy materials are automatically discharged via several funnelshaped sediment outlets. The efficiency of the saturation system is greatly increased in these plants in order to meet the requirements caused by higher wastewater loads. The main field of application of the HUBER Dissolved Air Flotation Plant HDF S is heavily polluted industrial wastewater and the separation of activated sludge as relief or alternatively as replacement for a secondary clarifier.[...]

[...]Maximum retention of fibres and hair Operating reliability for membrane bioreactors Maximum COD / BOD 5 reduction rates Mechanical pretreatment is required for both municipal and industrial wastewater in order to remove coarse materials and separate floating, settling and suspended solids. Depending on the method of wastewater treatment that is applied the mechanical pretreatment system must fulfil different requirements in terms of separation efficiency. Special plants which operate according to the MBR princi­ple put the highest demands on the mechanical pretreat­ment system as all coarse material needs to be removed. A cost-efficient solution must not only achieve the requested separation results, it must also provide high throughput capacities combined with maximum operat­ing reliability. Design and Function The characteristic feature of the HUBER Drum Screen LIQUID is its screen basket which is horizontally installed in the channel or in a tank. The wastewater to be treated flows through the basket from inside to outside. Whilst the wastewater flows through the open front into the screen basket, solids are retained within the drum. A special sealing between the channel and the front-end screen basket opening prevents unscreened wastewa­ter from passing through the screen basket. The solids settling on the drum surface lead to gradual blinding of the surface. As a result, the water level upstream of the screen rises. When the predefined maximum water level has been reached, the screen basket starts to rotate around its axis to clean its surface. At its crown a spray nozzle bar sprays water onto the drum surface from outside to remove the solids and flush them into a trough inside the drum basket from where the screenings are discharged by gravity. The screenings can optionally be pumped to a higher level. High pressure cleaning For preventive basket cleaning an innovative automatic high pressure system can be integrated as an option. The spray nozzle head rotates automatically due to the water pressure and moves linearly along the full length of the screen basket to clean the complete basket thoroughly and efficiently. Water demand and operator attendance are reduced to a minimum. Reliable sealing Every system is only as good as its sealing system in the inlet of the machine. A special PU sealing is therefore integrated in the HUBER Drum Screen LIQUID to ensure that no unscreened wastewater can pass through the screen and best separation results are met constantly and reliably. Low-maintenance direct drive The HUBER Drum Screen LIQUID is equipped with a unique, self-adjusting bearing unit. The drum can therefore be mounted stress-free with automatic angle compensation. The bearings are automatically lubricated for maximum availability. Model Variants The HUBER Drum Screen LIQUID is available in different designs and suitable for numerous applications of sol­ids-liquid separation. Depending on the specific application requirements the horizontal drum is covered with a mesh, wedge wire or perforated plate. Drum Screen LIQUID ww HUBER Drum Screen LIQUID with wedge wire drum, wedge wire sizes 0.5 / 1 / 2 / 3 mm. Solids retention with high throughput capacities of up to 10,000 m³/h per machine. Typical applications: Mechanical pretreatment on sewage treatment plants, industrial solids-liquid separation Drum Screen LIQUID pp HUBER Drum Screen LIQUID with perforated plate, perfo­rations 1.5 / 1 / 2 / 3 mm. High separation efficiency and retention of fibres and hair. Typical applications for 1 and 2 mm perforation: Protection of hollow-fibre membrane filtration plants Typical applications 3 mm perforation: Protection of plate membrane filtration plants Drum Screen LIQUID mesh HUBER Drum Screen LIQUID with mesh, mesh sizes from 0.2 up to 0.75 mm. Maximum separation efficiency and reduction of COD and BOD by up to 40%. Typical applications: Load reduction in the preliminary treatment stage, Replacement for primary settlement tank, Sea and river outfall applications. A tailored solution to suit any application: Industrial and municipal applications Primary and secondary treatment stage Protection of membrane plants Replacement for primary settlement tank Load reduction in the biological treatment system through reduction of COD / BOD / AFS Screening in the inlet to power plants Treatment of cooling water circuits Brewery wastewater River and sea outfall Surface and river water screening Replacement for Primary Settlement Tanks A special application is the use of the HUBER Drum Screen LIQUID as part of the HUBER CarbonWin® System (see separate product brochure ). The HUBER CarbonWin® System is the economically better alternative to a conventional primary settlement tank. The benefits of the HUBER Drum Screen LIQUID High throughput capacity – maximum separation efficiency Easy maintenance Low operation costs Low life-cycle costs Optional high pressure cleaning reduces maintenance requirements For channel or tank installation Various possible applications Maximum corrosion protection through stainless steel design and acid treatment in a pickling bath[...]

[...]Øygarden, Norway In Øygarden, one of the most modern wastewater treatment plants in the country was built - with innovative and optimally matched HUBER technology. Watch the video below to get an impression of the entire purification process at this remarkable wastewater treatment plant. After IFAT 2018, HUBER reported about the order for the Fjellvar project, which is the largest HUBER order in Norway so far. In cooperation with the Swedish plant manufacturer Purac and the HUBER service team from Norway and Germany, the supplied HUBER complete solution was installed and successfully commissioned at the end of 2019. The overall project was coordinated by HUBER Sweden in cooperation with HUBER Germany. The first commissioning went off quite smoothly in less than a week. At the beginning of 2020, the Fjellvar wastewater treatment plant was then able to start up on schedule. The smooth and on-schedule implementation of this complex process and mechanical engineering project shows exemplarily how advantageous it is when "everything comes from one source". The municipality of Fjell on Norway's west coast, just outside the town of Bergen, comprises more than 300 large and small islands. Since the late seventies a bridge has connected Fjell with Bergen, Norway's second largest and fast growing city. Fjell, where property prices are still cheaper than in the big city of Bergen, is also growing steadily and has now become a residential and sleeping settlement, where 23,000 people live today. By 2050, the population is expected to reach 40,000. The construction of another bridge is planned, which will shorten the distances for commuters to and from Bergen. Due to this development, it was also decided to build a new, central sewage treatment plant. The company FjellVAR was awarded the contract to design the plant, whereby the various districts and settlements will be connected via tunnel systems. One of the main reasons for awarding the project to Purac was the very limited space available for the construction of the Fjellvar treatment plant. For this reason, the sewage treatment plant was completely planned into a mountain called Storanipa. The concept provides for a multi-stage expansion, which includes compliance with the following minimum standards: Limit value stage 1 (without biological stage): 20% reduction of BOD 5 or < 40 mg/l BOD 5 in the outlet and > 50 % reduction of filterable solids (FS) or < 60 mg FS/l in the outlet of the sewage treatment plant Limit value stage 2 (with biological stage): 70% reduction of BOD 5 or < 25 mg BOD 5 in the outlet and 75% reduction of COD or < 125 mg COD/l in the outlet of the sewage treatment plant In addition to a service contract for 15 years including the necessary wear and spare parts, HUBER's offer included a mass balance as well as calculations of the energy, polymer and water consumption of the entire system and a variety of machines. For the specified operating conditions with 300 l/s (500 l/s design capacity) and 100% redundancy, HUBER put together a solution consisting of the following machine technology: Preliminary screening and grit trap: 3 x HUBER Complete Plant ROTAMAT ® Ro5 with 6 mm screen Grit treatment: 1 x HUBER Coanda Grit Washer RoSF4 Fine screening: 6 x HUBER Drum Screen LIQUID Sludge thickening: 2 x HUBER Disc Thickener S-DISC Sludge dewatering: 2 x HUBER Screw Press S-PRESS With a conventional primary clarifier, the separation efficiency can only be improved, depending on particle size, by providing more surface area and thus space. For this reason, the system of mechanical separation of primary sludge with a HUBER Drum Screen LIQUID is up to ten times more economical in terms of space requirement than a traditional primary clarifier. High throughput capacity with low pressure loss Small space requirement Specially developed PU sealing system in the inlet section for best possible separation efficiency Stable stainless steel mesh for maximum operational reliability Automatic high-pressure cleaning with process water Low wear, low maintenance costs Low energy consumption Also in this project, HUBER could impressively demonstrate how an economic and powerful solution can be designed with innovative products and extensive experience and finally be successfully implemented in a cross-company cooperation. At this point, we would like to thank everyone involved in Norway, Sweden and Germany. Complete wastewater treatment at the Øygarden WWTP in Norway Pointing-the-way, highly efficient wastewater treatment with HUBER Technology[...]

[...]Saalbach-Hinterglemm, Austria Fine screening systems are an interesting alternative to primary settling tanks when it comes to changing the sludge stabilisation process from aerobic to anaerobic. Compared with a traditional primary clarifier with a retention time of 0.5 to 2 hours, a fine screen achieves the same or better reduction rates, which take effect within a few minutes whilst requiring only a fraction of the space and volume. Energy savings and biogas yield through carbon removal Switching from aerobic to anaerobic sludge stabilisation can reduce aeration costs by around 20–25%. This reduction is achieved through carbon removal, usually through a primary clarifier or, as in the case of Saalbach, using HUBER fine-screen technology prior to biological treatment. This has also resulted in a further positive effect in terms of energy generation through the utilisation of primary sludge, which is used directly for the production of biogas or to increase on-site electricity generation. Seasonal utilisation of the Saalbach sewage treatment plant The municipality of Saalbach, known as a winter sports destination but also enjoying high visitor numbers during the summer, operates a sewage treatment plant at Glemmtaler Landesstraße 554 with a design capacity of 49,000 population equivalents (PE). Due to seasonal fluctuations, its actual utilisation varies between 10 per cent during the off-peak periods and 100 per cent during the peak season. Capacity limits and lack of primary treatment The Saalbach wastewater treatment plant already had two digestion tanks and a combined heat and power (CHP) unit, but no primary treatment. The digestion process had been fed exclusively with mechanically thickened excess sludge. With increasing tourism, particularly during the winter season, the plant approached its authorised capacity of 49,000 PE60 on some days. It was therefore necessary to find a solution to relieve the load on the biological treatment process. Plant expansion to relieve the load on the biological treatment process The first studies for the expansion were carried out in mid-2019. The aim was to relieve the biological treatment process through primary treatment, whilst simultaneously improving the energy balance through biogas production and electricity generation and reducing the energy required for aeration. Lack of space and integration of the mechanical primary treatment The aerial view shows that, nestled between the northern slope, the Glemmtal main road, the Saalach river and the southern slope, there was no space for a primary treatment tank. The plot on the western side was not available. The sketch outlined in red shows where the lifting station, the mechanical primary treatment (drum screen) and a primary sludge thickener (disc thickener) could be integrated into a confined space after the grit chamber and before the aeration stage, and in the immediate vicinity of the digestion tanks. Initial trial operation under winter conditions From mid-February 2020 to mid-March 2020, during the winter season and in freezing temperatures, the first operational trial was carried out using a demonstration unit of the HUBER Drum Screen LIQUID housed in a container with a 0.2 mm mesh. Optimisation of screen surface cleaning for grease-laden sludge Although the first trial run had to be cut short after a short time due to the coronavirus pandemic, it was already apparent that screen surface cleaning was, and remains, the key criterion; this is why the LIQUID screen was fitted with additional air-jet cleaning and a modified high-pressure cleaning system, enabling it to function reliably even with very grease-laden primary sludge. Thanks to the air-jet cleaning system, the drum screen produced a thicker primary sludge than was the case with spray-water screen surface cleaning, which is fed from the finely screened inlet. Second trial run confirms high COD reduction The second trial run took place between December 2021 and March 2022. This demonstrated that COD removal rates of 25–40 per cent (with and without the use of polymers) could be achieved, thereby reducing the load on the subsequent biological treatment stage through the removal of pollutants from the wastewater. Implementation and commissioning ahead of the 2025 World Ski Championships Following the local council’s decision and the granting of a water law permit by the Salzburg Provincial Government, construction of the primary treatment plant, including its integration into the existing system, began in late summer 2024, half a year before the 2025 World Ski Championships. Commissioning took place on 27 January 2025. At the end of the 2025 winter season, the primary treatment system was taken out of service until it was put back into operation during the 2025 summer season, from early June to late September. Operational results during seasonal operation Depending on the proportion of wastewater routed through the primary treatment system, the operational results showed a COD reduction of 26 to 33 per cent (daily composite sample) prior to entry into the biological treatment stage, in both winter and summer operation. It should be noted that this was achieved without the use of polymers. Flexible feeding and control of the C/N ratio Plant manager Josef Ebner and his colleagues are particularly impressed by the flexibility and ease of maintenance of the process: The mechanical primary treatment system is fed on a case-by-case basis and with variable flow rates from a load of around 15,000 p.e. It can be brought into operation within a few minutes. The C/N ratio for denitrification is adjusted to the required value by controlling the volume of influent withdrawn after the grit chamber and passed through the fine screen. Positive effects on energy consumption and electricity generation During peak load periods, the measure implemented leads to a significant reduction in the aeration energy required in the aeration tanks and, at the same time, to an increase in biogas yield, which in turn results in higher in-house electricity generation. Image Gallery Sludge Thickening: Primary sludge from the HUBER Drum Screen LIQUID in the HUBER Disc Thickener S-DISC HUBER Drum Screen LIQUID manufactured in the HUBER production in Berching HUBER Drum Screen LIQUID at the Saalbach WWTP HUBER Disc Thickener S-DISC[...]

[...]Removal of fibres and hair Service water and wash water treatment Defined separation size COD and BOD removal in river or sea outfall applications Protection of membrane filtration plants Separation of hair, fibres and fine suspended material from municipal and industrial wastewaters is in many applications essential for trouble-free and low-maintenance operation of subsequent treatment stages. Fine mesh screens are required to remove such materials. Wastewater treatment at source is necessary for many industrial installations to meet the requirements for wastewater discharge into sewer systems. Since waste-water fees depend on the freight discharged it is eco-nomically beneficial to minimise the freight by using a fine mesh screen for wastewater treatment at source. Design and Function The HUBER Drum Screen RoMesh® consists of a horizontal screen basket equipped with a fine square mesh (0.2 to 1 mm mesh size) or a perforated plate (2 to 3 mm perforation). Due to the two-dimensional effect of the mesh or perforated plate the screen removes very fine particulate material. The wastewater flows from inside to outside the basket through the screen surface. Filtrate is discharged vertically from the bottom of the drum and the screenings are transported horizontally by the rotation of the screen Filtrate is discharged vertically from the bottom of the drum and the screenings are transported horizontally by the rotation of the screen towards the discharge point. The discharged screenings are usually dewatered in a down-stream screenings press. A spray bar with alternately operating spray nozzles cleans the screen surface while the drum rotates. The screened wastewater can be reused as wash water if a sufficiently fine mesh is used. Applications of the HUBER Drum Screen RoMesh® The HUBER Drum Screen RoMesh® Screen is used to remove ultra-fine solids from municipal and industrial wastewater. The machine is completely made of stainless steel and pickled in an acid bath for optimal corrosion protection and minimised maintenance requirements. The compact units are supplied in a container. Separation of hair and fibers Separation of hair and fibers is crucial to protect downstream treatment stages. In technologies like Membrane Bioreactors (MBRs), preliminary separation of fine material is essential to ensure smooth and low-maintenance operation. Specifically, the removal of fibers and hair is critical before hollow fiber membrane plants as fibers may lead to tressing or blocking of the membrane. 1.0 mm square mesh to protect hollow fiber membranes 2.0 or 3.0 mm perforated plate to protect plate membranes feed pump from sump or channel COD and BOD reduction prior to river or sea outfalls Raw wastewater is often only treated with a mechanical coarse screen before being discharged directly into rivers or the sea. Ultra-fine screens are highly effective for outfall applications in rivers or seas, as they significantly reduce the COD and BOD loads in the discharge. This process is both fast and cost-effective. Due to their fine mesh, these screens not only capture waste but also effectively separate fine particulate material of organic origin, which has a high COD and BOD content. The screen is capable of reducing BOD by 20% and filterable solids (AFS) by 50%, ensuring compliance with the stringent discharge standards Even better performance can be achieved with prior precipitation and flocculation. Recovery of wash water and service water free of hair and fibers Separation of hair and fibers is crucial for reusing wastewater as wash water. The HUBER Drum Screen RoMesh®, with its two-dimensional square mesh, effectively retains nearly all hair and fibers, ensuring the treated water is suitable for reuse. Treatment of industrial process water Mechanical wastewater pre-treatment is essential to meet discharge requirements for sewer systems. Since wastewater fees are often based on the load (freight) discharged, it is economically advantageous to minimize this load at the source. The HUBER Drum Screen RoMesh®, featuring a square mesh for high capture rates, is specifically designed for this purpose, efficiently removing solids and reducing the load on downstream systems. A selection of the variety of applications in industries: Paper and pulp industry: separation of fine fibers Meat processing industry: separation of scraps Agricultural industry: separation of fruit and peel residues Breweries: mechanical preliminary treatment of all process waters Laundries: separation of fibers from wash waters The benefits of the HUBER Drum Screen RoMesh® Excellent separation efficiency due to the defined separation size provided by the square mesh Significant reduction of COD and BOD in river or sea outfall applications Protection of downstream treatment stages, e.g. MBR plants, through removal of hair and fibers High-pressure washing at 120 bar eliminates blocking of the square mesh Small footprint requirements due to the enclosed, compact design Reduced wastewater discharge fees through freight reduction[...]

[...]With integrated screenings press With integrated screenings washing Compact design Operating reliability, efficiency and hygienic operation are important factors for a mechanical separation plant. The aim is to achieve the maximum separation efficiency under the prevailing hydraulic conditions. The HUBER Fine Screen ROTAMAT® Ro1 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 (6 or 10 mm) and screen size (screen basket diameter of up to 3000 mm), the throughput can be individually adjusted to specific site requirements. The HUBER Fine Screen ROTAMAT® Ro1 is completely made of stainless steel and acid treated in a pickling bath. Design and Function HUBER Fine Screen ROTAMAT® Ro1 units are either installed directly into the channels, or are supplied as tank-mounted units, with an inclination of 35°. The wastewater flows into the open end of the inclined screen basket and passes through the screen, where floating and suspended materials are retained by the screen bars of the screen basket. Blinding of the screen surface generates an additional filtering effect so that solids can be retained that are smaller than the bar spacing. At a certain difference of the water levels up- and downstream of the screen, which is caused by screen surface blinding, the rake arm situated on the axle centre starts to rotate. Its tines, extending completely through the screen bars, clean the basket, remove all the screenings, and lift them to a 12 o‘clock position. The screenings drop into the centrally positioned trough with integrated screw conveyor. The rake is then returned back through its 12 o‘clock position. During this return movement a hinged comb pushes the screenings off the rake so that the tines are additionally cleaned. With the rotational movement of the conveying screw the screenings are transported out of the trough and conveyed through the rising pipe. As the screenings are conveyed and compressed within the inclined pipe, they are dewatered and compacted without any odour annoyance prior to being discharged into the customer‘s container or a subsequent conveying unit. The benefits of the HUBER Fine Screen ROTAMAT® Ro1 Low headloss – High separation efficiency Due to the screen basket shape and 35° installation the screen area is much larger than that of a vertical or steeply inclined screen, which results in a low headloss, high separation efficiency and maximum throughput. 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. Reliable, self-cleansing operation Positive cleaning of the complete screen area is guaranteed due to full engagement of the rake‘s tines. The screen is unimpaired even by high pollution loads. Additionally, a single flow path guarantees that the screenings remain constantly inside the basket (in front of the screen area), i.e. screenings are not taken out of the wastewater and transported into the already cleaned downstream flow during the cleaning process. Several functions combined in one system The ROTAMAT® Screen performs the functions of screenings removal, transport, washing, dewatering and compaction in a single space-saving unit. An additional bagging unit guarantees operation of the entire system without odour nuisance. Outdoor installation For outdoor installations, the HUBER Fine Screen ROTAMAT® Ro1 can be supplied with a frost protection, combined with an additional insulation, if required. Retrofitting The design of the ROTAMAT® Screens allows for later modification so that the systems can be adapted to changing requirements. Both the heating and integrated screenings washing system for example can be retrofitted. Low maintenance No lubrication is required. Routine checks and visual inspections are sufficient to keep the system running smoothly.[...]