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[...]Luzern, Switzerland Due to the increasing building density, cities are generally faced with the problem of lesser and lesser infiltration of rainwater water during storm events and the associated increasing risk of overflowing local sewers. Moreover, road runoff water contains not only grit and gravel but also considerable amounts of eco-toxicologically relevant substances from tyre wear and tar residues, for example heavy metals, such as cadmium, zinc and lead, as well as polycyclic aromatic hydrocarbons [PAH] and petroleum-derived hydrocarbons [PDH]. During rainfalls, the abrasion particles from road surfaces are washed directly into surface waters or the combined sewer system. Compared to the continuously generated residential wastewater, road runoff is on average generated only during 5% of the time and in varying intensity. Suddenly occurring storm events generate massive concentrations in the road runoff. The environmentally sound treatment of road-run offs is still an unsolved problem. A water safety regulation for the treatment of wastewater from highly frequented roads has been developed in Switzerland especially for this application. It is generally differentiated between two types of road runoff treatment systems. Due to the extensive sealing of surfaces, the runoff of precipitation water cannot be ensured anymore with retention soil filters on a natural runoff treatment plant but is treated in a so-called technical road runoff treatment systems. To meet the requirements of a technical road runoff treatment systems, HUBER SE has modified its HUBER Disc Filter RoDisc ® especially for this application. Since the end of 2015, two of these treatment plants have been operated in the Lucerne area. The plants "Seetalplatz" and "Frohburg" are designed for a road catchment area of 3.2 hectares and 2.1 hectares. The roads in the catchment area of Seetalplatz are frequented by about 50,000 vehicles per day. An important point during the project engineering phase was the careful consideration of the course of the roads. On winding roads, the concentration of wear particles from road covers and tarred surfaces is significantly increased. The road runoff treatment plant consists of several treatment stages. The road runoff flows through a line network to the treatment plant, preferably by gravity if possible. Settleable solids, such as grit and gravel, settle in the preceding coarse material separator due to difference in density. The wastewater flows then into a settling tank where the finer suspended particles settle and are removed at intervals via the sludge. In the last treatment stage, the pre-treated wastewater with a volume flow of 30 l/s is directed to the HUBER Disc Filter RoDisc ® prior to being discharged for infiltration or to a water course. The efficiency of road runoff treatment plants is categorized according to the solids and heavy metal reduction they achieve. As to solids, a separation efficiency in excess of 85% is reliably achieved, and more than 60% of the heavy metals (measured with zinc and copper) are reliable removed. The decisive advantages of HUBER disc filter plants lie in the absolute surface filtration and intensity of filter cloth cleaning. These are two indispensable factors as both tar and tyre abrasion particles have a high tendency to irreversible adhesion. Furthermore, the filter discs are designed to reduce the space requirements of the plants to a minimum.[...]

[...]Waßmannsdorf-Berlin, Germany About 3.4 million people live in Germany's capital Berlin presently. Together with the local industries they produce a daily amount of about 600,000 m3 of wastewater under dry weather conditions. The generated wastewater is clarified on six sewage treatment plants, one in the city centre and five large works distributed around the city. These sewage treatment plants discharge their wastewater into a receiving water course each. STP Waßmannsdorf lies in the southern part of the city within intermediate proximity to the new Berlin-Brandenburg airport. With a clarification capacity of 230,000 m³ wastewater per day (under dry weather conditions) it is designed for 1,300,000 PE. The entire amount of the city's wastewater is collected in main pumping stations via collecting lines and from there pumped to the sewage treatment works. On STP Waßmannsdorf the wastewater is fed into the screen building via two huge vertical pressure pipelines and distributed to four treatment lines. As the existing old screening system on site had shown its age and screens had to meet ever increasing requirements due to changing screenings composition, the plant operators decided to replace all machines in the screen building with new ones. In addition, the separation efficiency of the existing 8 mm perforated plate screen seemed to have become insufficient. That is why they decided during the planning phase to install a two-stage screening plant consisting of a multi-rake bar screen with 20 mm bar spacing as course screen and a 6 mm perforated fine screen. Due to the given conditions and scarce space in the building it was no easy task for the planning office PWU in Magdeburg to plan this project in detail in cooperation with Berliner Wasserbetriebe and put it out to tender. Highest attention was paid to two requirements: robust screens and flexibility of the manufacturer. Some of the requirements in the tender specification were very high and bidders had to submit a calculation together with their bid to prove they can meet these requirements. It had to be verified whether the supplier is able to manufacture products that can be tailored to suit specific project requirements. Not least due to the fact that we had already supplied four RoSF 4 Grit Washer units (size 16 l/s) in 2011/2012 via ATM Hartmann (Berlin), we finally received the order in autumn 2013 to supply one coarse, one fine screen and one screenings wash press for treatment line 1. In view of the site conditions the order was initially limited to one line. Placement of the order for the other lines was subject to trouble-free operation of the first-line screens during an eight-week test period under predefined load conditions. After mechanical installation of the complete plant at the end of 2013 and completed electrical installation the plant was put into operation in spring 2014. Despite a number of interfaces plant start-up went off without any problems so that the new screening system could be put into test operation after a very short time already. During this test period all mechanical equipment operated without troubles even during several heavy rainfalls with extremely high pollution loads. Throughout the whole period only one problem report was received from the coarse screen, this was caused by a big squared timber due to which the screen was reliably stopped by the integrated mechanical safety shutdown function (torque control) to protect it against damage. At the end of the test period it had to be proven that the screens can cope with the defined load conditions. The screens had to reliably manage water level differentials of up to 2 m with enormous amounts of screenings (90 kg per minute) upstream of the screens. It turned out during the test period already that such conditions were not at all exaggerated requirements on the part of the customer but real scenarios as they occur regularly on STP Waßmannsdorf. Since both screens and the wash press performed to the full satisfaction of the customer, we received in summer 2014 also the order for the equipment for the rest of the four lines. Presently, the screens of line 4 are installed, i.e. when the structural measures are finished. According to the time schedule the overall project is planned to be finished by the end of 2015. After project completion the following HUBER machines will be operating on site: 4 HUBER RakeMax® Multi-Rake Bar Screens, size 5300 / 2552 as coarse screens; Bar spacing: 20 mm with tear drop shaped bars (size 8 mm), throughput: 2700 l/s per screen 4 HUBER Belt Screen EscaMax® units, size 6000 / 2552 as fine screens, aperture: 6 mm, throughput: 2700 l/s per screen 4 HUBER Wash Press WAP units, approx. 2500 mm feed trough length, throughput: 8.5 m³/h per Wash Press 4 COANDA Grit Washer RoSF 4 units, size 2, throughput: 16 l/s per Grit Washer In operation since 2011 – HUBER COANDA Grit Washer units, type RoSF 4, size 16 l/s HUBER Belt Screen EscaMax®: Blinding of the screen during load operation and insertion of the bottom part of a two-part HUBER EscaMax® screen into the screen building[...]

[...]The HUBER Belt Screen EscaMax® is a system that especially offers our customers excellent separation results. Its high separation efficiency has officially been proven in tests carried out under real conditions with a 6 mm perforation screen. The excellent separation result of 84% has been confirmed by an independent institute. These above average results are on the one hand due to the two-dimensional design of our well-proven EscaMax® screen. On the other hand, such results can only be achieved on the basis of consequent further development and high manufacturing quality. Another positive aspect as to functionality and reliability is the sturdy design of the EscaMax®, particularly when huge amounts of grit and gravel need to be processed. Each end of the filter belt of the HUBER EscaMax® screen is connected with a drive chain that is driven by chain wheels. Each chain wheel is driven by a sprocket on a common shaft and a flange mounted gear motor. When they have passed the upper turning point the screening elements are cleaned by an internal spray nozzle bar which operates against screening direction. A separately and continuously driven roller brush enhances the cleaning process additionally. The roller brush operates against the travel direction of the filter belt, this improves cleaning efficiency significantly. Another advantage of this cleaning method is that a majority of the screenings, including abrasive material, are removed from the screening elements already in the first step of the cleaning process by the spray bar. It is obvious that the wear of both the screening elements and the roller brush is considerably reduced in this way. Furthermore, we have risen to another technical challenge and developed a new concept for the critical area where the screening elements are cleaned subsequently. The results have exceeded all expectations: The constant spacing between the roller brush and the semicircular screening elements guarantees gentle yet highly effective cleaning, especially with extremely high screenings loads. The innovation and reliability of the HUBER EscaMax® Belt Screen ensure increased separation efficiency, effectively eliminate pump blockage and wear, and minimise the formation of scum layers in digesters. The HUBER EscaMax® screen thus contributes to increasing the operating reliability of sewage treatment plants. Customers who want to reduce disposal costs even with increased amounts of screenings should additionally use the HUBER WAP/SL screenings treatment system. The special feature of this system is that spray water can also be used as wash water for the WAP/SL. High-turbulence washing of screenings removes the contained organic matter most effectively. An integrated impeller creates high turbulences so that a dry substance content in excess of 45% can be achieved. Residual material becomes valuable material in this way. Furthermore, the carbon-rich WAP/SL wash water improves denitrification, and up to 40% of the wash water are washed out organics which settle as primary sludge and lead to an increase in gas yield. With this innovative and intelligent technology HUBER proves how competence and expertise which have been gathered over many years can successfully be applied in practice. Our concept excels particularly due to its excellent separation efficiency and extraordinary stability and reliability. HUBER has sold hundreds of EscaMax® Belt Screen units and WAP/SL Wash Press units and is a market leader in this field.[...]

[...]Good ideas always find imitators 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 multi-rake bar screen RakeMax® for preliminary mechanical wastewater treatment was developed by HUBER in 2003 and presented to the public for the first time at IFAT 2005. Due to its versatility the RakeMax® has since very well proven its efficiency and become firmly established in the global wastewater technology market. More than 1,300 reference installations give proof of this success. On the basis of the successful RakeMax®, another new screen type for headworks has been developed in the course of continuous further development and for the first time presented at IFAT 2010, the L-shaped RakeMax HF® (high flow). Like the RakeMax® screen this L-shaped multi-rake bar screen belongs to the MAX family of HUBER screens. It were our competitors themselves who indirectly confirmed that we are on the right track with this innovation at IFAT 2014 where similar models could be "admired" on many booths. The RakeMax HF® screen consists of a flat and therefore hydraulically advantageous bottom section and a steep conveying section. This combines the benefits of the well proven RakeMax®, reliable solids separation and high screenings discharge capacity, with a low headloss due to a large effective screen rack surface. We have already sold more than fifty RakeMax® HF units. Due to the extremely small inclination of the bar rack, the screen section through which the flow passes is always double the flow profile in front of the rack. Another advantage of the large effective screen rack surface is that the flow velocity is very slow in the screen gaps with the result of a significant increase in separation efficiency. Furthermore, the flat installation angle of the bar rack and lifting of the material virtually at bottom level prevents problems with sediments in front of the screen, i.e. prevents right from the beginning that such material can settle at all. Main characteristics of the RakeMax® HF: High hydraulic throughput with a small bar spacing, even with deep channels Sturdy design, well-proven technology High removal efficiency Prevents disturbing sediments in front of the screen Especially with existing screening plants the minimum requirements on solids retention in the inlet are often not reliably met. One reason for this is certainly that people can select from a great variety of sanitary products today and have changed their consumer behaviour during the past years. To meet these changed requirements the passage opening at the bar rack needs to be reduced, but this frequently leads to growing hydraulic loads. These conditions make it inevitably necessary to provide for a bigger hydraulic passage area, and this normally means that the size of the existing channel has to be widened or even a new building erected for the screen, with the result of high construction costs. For such applications HUBER offers another screen type for headworks, the well-proven L-shaped multi-rake bar screen RakeMax® HF. RakeMax® HF screens can be adjusted to suit specific site requirements, both structural and hydraulic, and reduce investment and operating costs.[...]

[...]Bitterfeld Wolfen, Sachsen-Anhalt, Germany The sewage treatment plant Bitterfeld-Wolfen clarifies the municipal wastewater of the sewage treatment association "Westliche Mulde", the industrial wastewaters of the companies P-D-ChemiePark Bitterfeld-Wolfen and Industriepark BAYER Bitterfeld, and the groundwater of MDSE GmbH (large-scale ecological project of the regional authority for the release of soil remediation responsibility of the German Federal Land Saxony-Anhalt). The total capacity of the sewage treatment plant is 586.000 PE (population equivalent). The main wastewater clarification takes place in several separate pretreatment stages (mechanical, chemical-physical) and in one common aerobic biological treatment stage. To produce biogas, a separate wastewater flow from methyl cellulose production is treated in anaerobic reactors together with a partial flow of the municipal wastewater which is heated by heat exchangers. The municipal wastewater is prescreened in our ROTAMAT® Membrane Screen RoMem Pro 1600 to protect the heat exchangers. The RoMem screen is equipped with a 1.0 mm square mesh. The two-dimensional structure of this mesh ensures that a very high degree of fibre and hair retention is achieved. The RoMem Pro version is a further development of the standard system. The well-proven concept of HUBER ROTAMAT® machines excels especially for its drum-shaped screen basket and installation angle. The latter allows to combine several functions in one unit (screening, washing, removal, compaction, dewatering). For applications with increased throughput requirements HUBER has developed the RoMem Pro version which makes it possible to continuously wet a larger area of the screen surface and thus significantly increase throughput capacity compared to the standard design. A smaller design is therefore sufficient to achieve the same results but with reduced space requirements, construction costs, investment costs and spray water demand. The simple design of the Pro version also permits easy retrofitting of existing screens so that an increase in throughput capacity can be achieved without the need for any structural alterations of the channel. Even if the backup at the outlet end is high the Pro design guarantees the safe transport of screenings and thus ensures a reliable and safe plant operation even under difficult conditions. Like the folded perforated plate of the RPPS Star screen, also this Pro version represents a further development of the well-known and well-proven system of HUBER ROTAMAT® screens (Ro 2, RPPS, RoMem): The new innovative design makes it possible to even better adjust the machines to individual requirements and conditions. It is even more easier now to find the most optimally suitable solution for different wastewater qualities and installation conditions.[...]

[...]Rittersdorf, Germany The clever alternative - example Francois Screw presses have established themselves in the dewatering of municipal and industrial surplus sludge in recent years and have become a cost-effective, low-maintenance and operator-friendly alternative to centrifuges, belt presses or chamber filter presses. HUBER has meanwhile equipped several thousand plants and the machines are not only used for sewage sludge dewatering on municipal wastewater treatment plants, but also for industrial residual sludges (e.g. flotate sludge, sludge containing fibres, etc.) and even mineral sludge such as from mining, or for dewatering sludge from tunnel construction. Many, especially smaller, municipal or industrial plants do not set up own dewatering systems, but rely entirely on cooperation with local disposal contractors. In this case, the sludge produced is temporarily stacked at the wastewater treatment plants and then regularly (once or twice a year) dewatered with the help of container or trailer-based systems and usually collected and recycled by the disposal company. The Francois Company from Rittersdorf in the Eifel is a medium-sized disposal company that provides this service for many municipalities and industries in the region. More and more screw compactors are now being installed in trailers and semi-trailers. The decisive factor here is that the systems are operated fully automatically and are also equipped with remote monitoring or access so that they can be operated as unmanned as possible after start-up. Francois currently has two HUBER Screw Press Q-PRESS ® 440.2 machines installed in two-axle trailers and one HUBER Screw Press Q-PRESS ® 620.2 in a semi-trailer according to the requirements. The plants are designed and manufactured by HUBER according to the needs of Francois. Especially the smaller plants Q-PRESS ® size 440.2 are ideal solutions in terms of logistics and throughput capacity and thus serve the smaller and medium-sized sewage treatment plants in sewage sludge dewatering. In addition to these contract dewatering tasks with mobile plants, Francois also operates partnerships with industrial companies. For example, the sludge disposal of a large milk processor in the region has been organised for many years. For this purpose, Francois has replaced the corresponding dewatering system on the dairy's premises with a HUBER Screw Press Q-PRESS ® 440.2 and operates it there as part of the disposal agreement.[...]

[...]Changing from aerobic to anaerobic sludge stabilisation More and more municipalities in Germany are striving to optimise the energy efficiency of wastewater treatment on their sewage plants. Generally, there are two options: energetic rehabilitation or expansion of the treatment plant capacity. An expansion of the treatment plant capacity is possible through the construction of a new biological stage, but is counterproductive in terms of energy optimisation, since an additional biological treatment stage requires a considerable amount of additional aeration energy. This solution also increases disposal costs. The energetically more sensible option for the rehabilitation of small plants of 10,000-20,000 p.e. is very often to change from aerobic to anaerobic sludge stabilisation. This conversion makes it necessary to integrate both a mechanical pre-treatment unit and a digester for anaerobic sludge stabilisation into the system. Up to now, the literature has pointed out that the implementation of a digester would only be economically viable and make sense for expansion sizes larger than 20,000 PE. In view of rising energy costs and increasing disposal costs, this assessment has now changed fundamentally. An economic conversion from aerobic to anaerobic sludge stabilisation does not only require the economically best design of the digester, but also the optimal method of organic carbon removal from the biological treatment stage. Regarding the removal of organic carbon from the biological treatment stage, the HUBER Drum Screen LIQUID is the most economic option compared to a traditional primary clarifier (sedimentation tank), as numerous feasibility studies and implemented concepts have shown. The economic efficiency of a sludge digestion system depends mainly on the type of digester construction. In general, a distinction is made between concrete digesters, screwed steel silos with a bottom chamber, screwed steel silos with a concrete hopper and welded steel silos. However, it is not only the type of construction that influences economic efficiency, but also the type of sludge digestion process used. Compared to the usual fully mixed digester, in the "2-phase digestion" process the digester is operated with hydraulic displacement or stacking from the bottom to the top. This mode of operation means that there is no fresh substrate slip, and an increase in gas yield of up to 20% is achieved compared to conventional permanently mixed digesters. Another advantage of hydraulic displacement compared to a digester with mixing (agitator) is that a saving of 3-10 W/m³ can be achieved. Due to this process management without mixing, an enrichment and concentration of the necessary microorganisms is possible, which contributes to an increase in gas production. Economic process integration: Decisive for the economic efficiency of a possible process change from aerobic to anaerobic sludge stabilisation are both the electricity costs and the level of disposal costs. For wastewater treatment plants with an expansion stage of 15,000 to 25,000 p.e., there should be at least 200,000 euros per year in electricity and disposal costs. Furthermore, gas yield curves are used to draw conclusions about biogas production and sludge dewaterability. If a comparison of the original configuration of the wastewater treatment system with the system changed to anaerobic sludge stabilisation shows as a result a saving of at least 50,000 euros, a recommendation is made to continue the planning process. References of 2-phase digestion (change from aerobic to anaerobic process control) Project Hildburghausen: 20,000 p.e. (50 kW micro gas turbine) Project Kahla: 15,000 p.e. (30 kW micro gas turbine / 50% energy compensation) Project Staßfurt: 70,000 p.e. (two gas turbines 65 kW / energy compensation 70 %) Project Pocking: (17,000 p.e.; one gas turbine 65 kW / 50% compensation) Advantages of 2-phase digestion: Retention time 10-14 days No circulation energy (savings potential: 3-10 W/m³) Increased gas production (up to 20% compared to mixed systems) Small installation space Low investment costs Fully welded stainless steel construction (preferred variant: welded steel silo) Figure 2 shows the individual variants of 2-phase digestion. The volume in each variant corresponds to 200 m³ with construction heights of 8 to 22 m. Due to the shorter service life of the screwed tanks, the "welded steel silo" design with bottom chamber is the most economical variant. The other variants shown are 5-10% higher in price. Subsidies for process conversion The selection of the digester system and the associated investment costs are an important criterion when applying for subsidies. With regard to compliance with effluent values, coordination with the lower water authority is necessary. No BiMSch procedure (procedure according to the Federal Immission Control Act) is required for the planning and implementation of the sludge digestion system. The funding according to the Local Authorities Guideline 2020 shows that 40% of the eligible costs are subsidised. CHP and machine installation rooms are not eligible. The prerequisite for applying for funding is the submission of a meaningful potential study. As this is ERDF funding, it can be combined with the Local Authorities Guideline.[...]

[...]Groß-Gerau, Germany The Gerauer Land waterworks supplies around 65,000 inhabitants in the Hessian district of Groß-Gerau with drinking water. The water supply amounts to around 3.3 million m³ per year. The water supply is ensured by extracting groundwater from their own ten deep wells, then treating it to produce drinking water by means of iron removal and demanganisation, and feeding it into the network via a central pressure booster station. After more than half a century of operation, the valves, pipelines, pumps and technical doors had reached the end of their service life. When renewing the system, the planners' declared aim was to significantly increase energy efficiency in particular, but also to improve building protection. In the course of the refurbishment, burglar-resistant stainless steel doors made by HUBER SE from Berching were therefore installed, which increase the protection of the rooms through increased burglar resistance. For here too, the company wanted to have state-of-the-art technology. Drinking water is our most important resource and should therefore be adequately protected against any impairment. For this reason, it must be ensured that it is impossible for unwanted intruders to have a chance to enter a water supply system. The burglar-resistant HUBER Security Door TT2 of resistance classes RC3 and RC4 (formerly WK3/WK4) with test certificate is ideally suited for this application. These stainless steel doors are specially designed as access doors for drinking water supply structures and meet the requirements of DIN EN 1627. Every HUBER stainless steel door type TT2 can be opened from the inside, even if the door is locked from the outside. For doors used in the water supply sector, this is an important aspect with regard to occupational safety and accident prevention. The door leaves, which are longitudinally ground, offer an attractive design and are foamed with a CFC-free insulating core. To ensure a long service life, the frame and door leaf are welded under inert gas, pickled in an immersion bath and passivated. Various options, such as sheet metal or wood panelling, allow the HUBER TT2 security door to be optimally adapted to customers’ requirements. We are happy to consider and implement special requests of our customers, e.g. regarding lacquering, logos or door shapes, such as round or pointed arches. Often, the protection of historical monuments also plays an important role and must be taken into account when designing the exterior of the doors. All doors for the Gerauer Land pressure boosting station are equipped with magnetic and lock-bolt contacts so that the building shell can be monitored completely. Security doors for outdoor installation are additionally fitted with a sheet metal doubling to ensure that the door can be opened even in direct sunlight. This is often a problem in spring or autumn when the sun heats up the doors. However, it is not only drinking water supply structures that require special protection against unauthorised access. Remotely located shafts, such as deep wells or spring shafts, are also at high risk to be manipulated by unauthorised persons. It is not necessarily an " attack " that is to be assumed here; often it is vandalism, whereby increased mechanical security can prevent access to the shaft. For this reason, the HUBER product range includes various burglar-resistant manhole covers. These manhole covers are also certified to DIN EN 1627 in resistance class RC3 and are available in different sizes. With the renewal of the aged central pressure boosting station, the Gerauer Land Waterworks is making an important contribution to energy saving and to an optimal protection of the building envelope. We at HUBER are proud to make our small contribution to securing the supply in the Gerauer Land region![...]

[...]Star, Idaho, USA The Star Water and Sewer District knew change was going to come. The plant’s existing in-channel grinder technology wasn’t just aging, it was obsolete. The unit was also in need of repairs that could force two weeks of downtime. Regardless of what they did to “fix” the existing unit, its performance would lag behind newer screening technology. Consultants and engineers pointed the district to HUBER and its ROTAMAT® STAR fine screen as a replacement that would take the plant into the future. The single-most important result that Star Sewer and Water District Waste Water Treatment Plant Operator Ken Vose was hoping for from the HUBER unit was preventing harmful screenings from reaching the plant’s membrane bioreactor. “We need to make the flow entering the membrane bioreactor as clean as possible. Keeping the Muffin Monster didn’t make sense – even if it was repaired to its performance potential.” Ken Vose, Plant Operator Protect downstream components The Plant’s membrane bioreactor is an important unit. It is a premier solution for cleaning wastewater but its excellence comes at a cost. The membranes in the bioreactor can be easily damaged by solids in the flow. Damaged membranes are expensive to replace and cause costly downtime. Replacement technology for the in-channel grinder technology must protect the membrane bioreactor. Implement more impressive technology HUBER’s ROTAMAT® STAR Technology fits the District’s needs perfectly. Ken Vose was excited at the opportunity to implement another Huber unit. With the solid performance of the screw press already in place, Ken Vose was confident in the potential success of the Huber fine screen selected for the plant. Screening twice the trash The success of the HUBER Perforated Plate Screen ROTAMAT® STAR shows up in the dumpster. With the previous unit in place, the dumpster had to be emptied every two weeks. The Huber unit screens so much from the flow that the dumpster requires emptying weekly. “We enjoy our working relationship with Huber. Their units are highly-efficient in producing exactly what we need: cleaner channel flow. And their project and support experts work hard to make sure Huber units are meeting expectations.” Ken Vose, Plant Operator Expertise in tweaking performance HUBER understands that every plant is unique. Each project expert is schooled in the nuances that can impact unit performance. Everything from the plant’s geography to the content entering the headworks has an effect on performance and often requires delicate tweaks to the unit. The build-up causing the frequent pressure washing for the District’s unit could easily be eliminated by adding a second spray bar. The tweak was exactly what the flow required. Ken Vose notes that, it’s been more than four months since the second spray bar was installed and they have not needed to pressure wash the unit at all. “We had concerns about the performance of the STAR screen at first. Yes - it was producing lots of screenings but we had to shut down and pressure wash the unit every 14-21 days. Our project rep saved the day.” Ken Vose, Plant Operator Working like a champ The ROTAMAT® STAR technology fulfills an important role in protecting the membrane bioreactor by eliminating as much solid screening as possible. The unit is dependable beyond expectation and performs extremely well. It is much more efficient in removal than its predecessor was or ever could be. Beyond technology HUBER’s experience with municipalities and with wastewater processes is extensive as is its knowledge of the technologies it provides. This industry-technology insight allows HUBER to work with organizations to go beyond the technology to ensure that systems are geared to perfectly match up to immediate tactical challenges and long-term strategic goals. “Huber’s technology is superior in the marketplace but our experience has been that its service is unmatched as well. We’ve benefitted from the expertise of project managers and support and service experts. They understand that you can’t lose focus after implementation because it is when the unit is in operation that important tweaks can be identified and implemented. This attention goes a long way in taking an implementation from great to game-changing.” Ken Vose, Plant Operator[...]

[...]HUBER presents the HUBER Multi-Rake Bar Screen RakeMax® CF, an innovative variant of the well-proven RakeMax® system with a Centre Flow screen. The model impresses with its hydraulic throughput capacity by means of a U-shaped bar rack, even with small bar spacings and in narrow channels. It offers an optimal hydraulic utilisation of existing channels and the screen is unsusceptible to grit, gravel and stones. 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. Highly valued in the market and proven in thousands of installations all around the world, the HUBER Multi-Rake Bar Screen RakeMax® is well established in the market due to its versatility. As a result of continuous development, another innovative screen type has now been designed based on the successful RakeMax® principle. The HUBER RakeMax® CF is a modified variant with a U-shaped stationary screen rack installed between the two screen frames. The bar rack is arranged in 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. At the end of the bar rack cleaning cycle the cleaning elements are 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. Due to the screen’s compact design its height above floor is very low. By developing the HUBER Multi-Rake Bar Screen RakeMax ® CF, we have successfully united two proven screen designs into an innovative screening system that is unique in terms of both reliability and functionality. 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. The main benefits of the HUBER Multi-Rake Bar Screen RakeMax ® CF at a glance: Proven technology of two screen designs combined into one High hydraulic throughput capacity due to U-shaped bar rack No submerged moving parts Very little space required due to vertical installation - ideal for narrow spaces and deep channels Rake tines fully engaging with the bar rack Screen rake engaging above the bar rack / water surface Increased separation efficiency through flow deflection in the bar rack An optionally integrable emergency overflow eliminates the need for an emergency bypass construction This new development maintains the positive characteristics of the proven HUBER Multi-Rake Bar Screen RakeMax ® , such as high screenings discharge capacity due to a variable number of rake tines, automatic scraper device without use of process water, etc. The HUBER Multi-Rake Bar Screen RakeMax ® CF has successfully proven its functionality in daily operation over a long time in a size 5 wastewater treatment plant. Due to positive experiences in practical operation it was possible to create and implement another innovation in the field of mechanical wastewater treatment. Especially with existing screening plants the minimum requirements on solids retention in the inlet are often not reliably met. One reason for this is certainly that people can select from a great variety of sanitary products today and have changed their consumer behaviour during the past years. To meet these changed requirements the passage opening at the bar rack needs to be reduced. This is usually accompanied by a growing hydraulic load. These conditions inevitably mean that a larger hydraulic passage area must be made available. This in turn usually means that the existing screen channel needs to be widened or even a new screen house must be built, with the consequence of high construction costs. For such cases, HUBER offers with the HUBER Multi-Rake Bar Screen RakeMax ® CF another screen option for headworks. RakeMax ® CF screens can be adjusted to suit specific site requirements, both structural and hydraulic, and reduce investment and operating costs.[...]