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[...]Sheboygan, WI, USA A new HUBER Belt Dryer project is on the way in the USA. A BT 18 dryer for a throughput of 11,700 t/a will be installed at Sheboygan in the US state Wisconsin. HUBER SE could win the order already in July 2012. We were commissioned to supply not only the belt drying plant, our scope of delivery includes also a HUBER Screw Press Q-PRESS®, size 800 for sludge dewatering. The HUBER Belt Dryer we supply to Sheboygan will be the first installation of the new dryer generation in the USA. The plant conception excels for its excellent energy efficiency and a high level of safety. The low electrical energy demand is achieved primarily through the new control concept and the so-called "helix air flow" which ensures that the process air streams through the drying chambers as a spiral air flow. As the air is reheated in each chamber, its load capacity can be utilized to the maximum. This means that only that amount of air needs to be moved through the dryer which is actually used for drying. Much smaller drives are therefore sufficient for the ventilators and also the exhaust air treatment system can be dimensioned very small so that a lot of operating costs can be saved. Especially the feeding system of the dryer ensures a reliable plant operation. The sewage sludge extruder, also called pelletizer, presses the sludge and produces spaghetti-like sludge strands with a defined surface-volume ratio. As the sludge keeps its form during drying it is possible to avoid the highest safety risk involved with the operation of belt dryers, namely the production of dust. To facilitate the installation work to be carried out on site the dryer will be pre-assembled in the factory and delivered as only few individual parts. Furthermore, a HUBER engineer will be there to supervise installation on site and support the local installation team. Facts and figures on the project: Site: Sheboygan, Wisconsin, USA Size: BT 18 Dryer length: 24 m Water evaporation: 1.361 kg/h Throughputmax: 11.700t/a ; 1.800 kg/h Operating time: 6.500 h/a Drying: from 20% DR to 90% DR Heat source: Warm water 90° C[...]

[...]Salt Lake City, USA Solar drying of sewage sludge is a technique that is increasingly used to reduce sludge disposal costs and at the same time protect the environment. Today, operators of even medium-sized and large wastewater treatment plants from all over the world appreciate our innovative and reliable solar dryers. The HUBER Solution for sewage sludge drying with solar energy is working with a continuous drying process, that is odourless due to complete restacking of the sludge. Its unique combination of sludge turning and transport performs both spreading and turning of the sludge as well as baxmixing and its transport from one side to the other. Due to their high efficiency our solar dryers can be operated the whole year round even in temperate climate zones with solar power alone. This gives of course an outstanding eco-balance and cost-efficency. So, the first HUBER SRT installations with with HUBER Sludge Turner SOLSTICE® in the Rocky Mountains have been in operation for almost a year now, even during winter. The site is located near Salt Lake City, in one of the most attractive skiing regions in North America. When the sun shines on the greenhouse the temperature in the drying bed can easily rise higher than 15 °C despite sub-freezing temperatures outside. The plant is operated the whole year round even though drying results are naturally better in summer. Under this project HUBER SE supplied not only three of the biggest size solar dryers (type SRT 11) but also a new sludge dewatering system. HUBER thus ensures trouble-free operation on site from thin sludge treatment to the dry sludge granulate. Due to the automated feeding system no pasty sludge from the dewatering units needs to be handled. In North America golf sport is very popular, even on the dry and nutrient-poor soils in Utah. The Tooele sewage treatment works where the HUBER solar dryer is installed becomes the lifeline for the local recreational areas: The clarified wastewater can be used to irrigate greens while the dried sludge is a good fertiliser which is especially hygienic during summer. Valuable raw materials for the golf course are recovered from dirty wastewater – a good reason to nominate this golf resort for an award. Thanks to these positive experiences with HUBER equipment more solar drying projects are already in the planning stage in the USA. HUBER's solar drying systems have been recognized as well-proven technology in Europe for many years already. Now they become increasingly accepted even overseas as innovative yet solid solutions. Facts and figures: 3 units HUBER Solar Dryers SRT with HUBER Sludge Turner SOLSTICE®, size 11 2 units HUBER Screw Presses S-Press for upstream sludge dewatering Hall lenth: 3x 100 m 3.000 m² drying area 5.800 t dewatered sludge / year Sludge dried from 18 % DS to 70 % DS (average) Special feature: operation during the whole year only with solar power - no external thermal energy[...]

[...]Penzing, Germany Solar sewage sludge drying has become a generally accepted ecological and economical technology. To make the implementation and operation of a solar drying plant a sustainable success, all relevant aspects need to be fulfilled: economic and planning aspects but as well acceptance on the part of the operator and the public. One of the plants that offer both, a perfect design concept and acceptance, is installed on WWTP Penzing-Weil near the Upper Bavarian lake Ammersee located southwest of Munich. About 8,500 residents are connected to this aerobic stabilised sewage treatment plant. In 2008, when WWTP Penzing Weil was requested to measure PFT, high concentrations of perfluorinated tensides were found and disposal costs rose from 30,000 € to about 100,000 €. Investing into sludge treatment with the aim to reduce annual disposal costs therefore became financially rewarding. Consequently, a sludge treatment plant including sludge dewatering and drying was started to be built at the beginning of 2010. After its completion and a test phase the new plant was officially put into operating in July 2010. The process of sludge treatment starts with a HUBER Screw Press Q-PRESS® 440. A screw conveyor automatically transports the compacted sludge into the greenhouse and drops sludge onto the greenhouse floor. The sludge turning/transporting assembly SRT 9 both distributes and transports the sludge inside the greenhouse. At the end of the greenhouse the dried granular sludge is dropped into a storage bunker from where it is loaded on trucks by a wheel loader 5 to 6 times a year. Dryer efficiency variations between summer and winter are compensated by two buffer tanks for thin sludge with 700 m³ capacity each. Depending on the weather conditions, the sewage works operator feeds more or less sludge to the dryer. Either directly the thin sludge settled in the secondary clarifier or the prethickened sludge from the tanks can be dewatered in the HUBER Screw Press. The plant operation program provides for the possibility to select at the push of a button whether to feed to the screw press excess sludge with approximately 1% dry substance or statically thickened sludge with approximately 3.5% dry substance. Where no storage capacity is available or the available space is scarce, the solar dryer efficiency can be increased by adding exhaust heat or ‘ecological heat’. ‘Ecological heat’ in this case means the heat generated ecologically from clarified wastewater by means of a heat pump. The HUBER heat exchanger RoWin guarantees reliable operation with low maintenance requirements. This type of heat exchanger provides automatic removal of algae and other pollutants that may settle on the exchanger surfaces. The greenhouse length and thus drying surface required depends on the requested drying efficiency. The required power depends on the dewatering results the HUBER Screw Press Q-PRESS® is designed to achieve. Against this background, the greenhouse hall on WWTP Penzing was designed a couple of metres longer than actually necessary. The plant operators use the resulting increased dryer capacity to reduce the polymer consumption of the dewatering system and in this way save even more costs. Automatic sludge feeding into the greenhouse eliminates the need for material transfer points and wheel loaders, and saves operators work and time. They benefit from an excellent sludge handling concept that minimises odours. Direct feeding and immediate turning of the sludge in the dryer instantly brings the sludge into a safe, virtually aerobic condition that ensures minimum odour development. No odour at all is noticed on WWTP Penzing Weil. For efficient and odour-free drying, climate technology and mechanical equipment components must be selected and designed to perfectly suit each other. The HUBER climate control system incorporates experiences from operation, measurements in the greenhouse and theoretical thermodynamic principles. The greenhouse is equipped with climate sensors, ventilators and ventilation flaps. The electrical control system ensures an ideal drying climate is constantly maintained inside the greenhouse hall by monitoring the water absorption capacity of the air inside and outside the hall and by limiting condensate. The run time of the ventilators that directly aerate the sludge bed is controlled according to the work cycles of the sludge turning machine (and the freshly turned sludge bed zones) and the drying capacity of the air. The air is routed differently as required in the different sludge drying areas. Of course, the control system always gives priority to the safety of mechanical components and protection of the building against storm. The mechanical equipment components for sludge turning and transport are at the heart of the solar dryer. The sludge turning assembly consists of a rotating double shovel that draws itself through the greenhouse along chains. While the shovel rotates and at the same time travels forwards, the sludge is aerated, turned around, granulated and transported. When the sludge turning/transporting assembly arrives at the end of the hall, each individual sludge granulate grain has been aerated. This cycle normally is performed every hour. In the feeding phase, turning of sludge in the wet zones in the front section and its aeration over the full greenhouse width takes place even every 20 minutes. As the complete sludge bed is restacked, the quasi-aerobic condition of the sludge is reliably maintained and optimal preconditions for drying are achieved. Another exceptional feature of the HUBER SRT system is continuous backmixing of sludge. The double shovel is also used to move sludge from one place to another. Backmixing of dry granulate into the sludge feed increases the dry residue to 40% directly after feeding. At this dry residue level, any odour-intensive biological activities are stopped. In addition, sludge with 40 % DR is more open-pored, easier to dry, less pasty and therefore easier to process mechanically so that the long life of the applied technology is guaranteed. On the other side of the sludge bed, the dry side, continuous backmixing produces the opposite effect. The zone where the granulate becomes very dry is very short. This is the zone where dry material is exposed to mechanical stress with the result of dust being generated. The sludge bed that is generated throughout the greenhouse hall length by the backmixing effect excels with a very long basic drying area where the dry residue slowly increases from 40% to 60%. This is the area where the actual drying process takes place. The requested dry residue of usually 80 to 85% DR is achieved only in the last 10 to 15 m of the sludge bed. As the sludge turner transports and relocates the sludge in its shovels, it permits the removal of dried granulate optionally on the same gable side of the greenhouse hall where the wet sludge is fed. The plant can be designed for granulate discharge into an underground screw conveyor with grate cover. It is for example possible to build the greenhouse in the boundary area of the WWTP grounds without the need to build another road and a second traffic area at the other end of the greenhouse. On WWTP Penzing, however, the conventional solution was selected with sludge feeding and removal taking place on the opposite ends of the greenhouse. This design variant made more sense with regard to the structures already existent on this site. The operators on WWTP Penzing have the choice to feed their sludge automatically or optionally by means of a wheel loader but, according to plant manager Markus Keller, do not use the latter option. One push of a button would be sufficient to make the sludge turner work off a heap of sludge built by the wheel loader. Continuous automatic feeding ensures that the screw immediately feeds the amount of sludge that has accumulated after a quarter of an hour. As described above, this is the better design solution for minimum odour development. If, however, the sludge to be dried is stabilised and well dewatered, automatic feeding is not necessarily required. The sludge turner assembly moves on precast concrete parts as it travels through the greenhouse hall. The design of the actual drying area on WWTP Penzing resembles a normal road. The precast concrete parts take over the function of the kerb stone edge of a road, the space in between is covered with asphalt. The foundation is frost-proof and hardly statically loaded by the machine and sludge. Optimum operator support during the plant start-up phase and afterwards is provided with a remote control connection. The electrical control system records the relevant parameters and via secure internet connection makes them at any time available for the experts in the German HUBER headquarters. Also operating statuses, such as total sludge bed height or operation cycle presently going off, are transferred in real time. The electronic components to be installed directly on the turner assembly have been limited to the minimum. No control box is mounted on the travelling turner assembly but only a somewhat bigger closed terminal box. The majority of the control components required are integrated in the main control cabinet which is installed in the sheltered area of the drying hall. Their exposure to environmental conditions therefore is reduced significantly with the result of easy maintenance and a long product lifetime. The system installed in the 100 m long and 10 m wide greenhouse on WWTP Penzing is a HUBER Solar Active Dryer SRT 9. Systems for 7 m and 12 m greenhouse width are available as an option. Solar drying is the most eco-friendly solution to dry sewage sludge. In addition to the economic benefits obtained through reduction of the sewage sludge volumes to be disposed of, also the environmental impact is reduced: Fewer trucks are required for sludge removal with the result of reduced carbon dioxide emission. The high dry residue content in the dry granulate improves the thermal value of the material to be disposed of. It offers plant operators a variety of disposal options so that they get more independence in sludge disposal.[...]

[...]Varna, Bulgaria The Bulgarian Black Sea Coast along the city of Varna with 300,000 residents is an important economic factor, especially due to its touristic potential. The European Union decided in 2002 to give aid money for the protection of the Black Sea, in particular for upgrading and building new local sewage treatment plants. The capacity of the sewage treatment plant at Varna could therefore be expanded to 450,000 PE and equipped with state-of-the-art technology. The main intention was to minimise the direct discharge of untreated wastewater to the Black Sea. They wanted to achieve that the quality of the discharged wastewater in the future meets the European standards for nitrogen and phosphate. At Varna, for example, one of the biggest sewers has been connected to the sewage treatment plant, the biological treatment stage has been upgraded. The digesters have been modernised and equipped with an energy-from-biogas system. HUBER won the public tender for the mechanical sludge thickening system in 2011. We supplied three type HUBER Screw Thickeners S-PRESS 4L still in the same year. HUBER screw thickeners have been used by customers all around the world for more than 20 years already. The thickener installed at Varna is a size 4L unit which, in 2008, was especially further developed for high hydraulic throughputs and high solids loads. The well-proven operation principle of a slowly rotating screw inside a massive stainless steel filter basket allows for virtually unlimited filter lifetimes. As the sludge to be thickened is conveyed against gravity and due to the special geometry of the conveying screw high thickening degrees can be achieved and break-through of insufficiently thickened sludge due to e.g. varying inflow conditions is effectively prevented. Reliable measuring equipment is used to control machine load and thus allow for automatic operation of the screw thickeners without operator attention. The operating data of the Varna plant prove the capacity and reliability of the HUBER machines: They thicken biological surplus sludge from static thickeners and, with a throughput of 75 m³/h and varying solids content of 1.6 - 2.4 % in the inlet, process an average solids load of 1500 kg/h. Despite the inhomogeneous inflow the sludge is reliably thickened to an extraordinary solids content of 6 - 8% which is the optimal basis for the following digestion. Due to the low connected load of only 3 kW per machine the balance of the new digester gas block heat and power plant is hardly affected. For more than two years since start-up all three machines have operated reliably and to the full satisfaction of the Bulgarian operators.[...]

[...]Erlangen, Germany Convincing belt drying solution for sewage sludge At the beginning of 2021, HUBER was awarded the contract for the supply of a HUBER Belt Dryer BT 16 for WWTP Erlangen after an EU-wide public tender. In the run-up to the tender for this advanced sludge treatment project for a volume of 15,700 t/a, several processes were investigated. These were: Solar Sewage Sludge Drying Hydrothermal carbonisation Belt drying The decision was made in favour of the belt drying option, as this drying process allows the sewage sludge to be dried continuously to >= 90% DR. The thermal energy demand of the drying plant is ensured 100% by renewable energy from the existing combined heat and power system of the sewage treatment works as well as from a combination of PV systems and heat recovery using high-temperature heat pumps. The electrical energy needed for belt drying is also generated 100% by renewable energy from digester gas converted into electricity in the combined heat and power plant. The sewage sludge, dewatered to approx. 28% DR, can be temporarily stored in the existing sludge silo and discharged via screw conveyors into the feed hopper of the thick sludge pump. The eccentric screw pump conveys the sludge into the extruder of the dryer. An inline inlet DR measurement is installed in the sludge line to continuously measure and record the DR content of the dewatered sludge. Based on the measured values, the drying plant is automatically and optimally adjusted to the sludge currently being fed. In the extruder itself, the sludge is pressed through a die and the sludge “spaghetti” are then fed onto the upper belt of the dryer, which ensures high permeability for the dryer air flowing through. The upper dryer belt transports the fed sludge once in longitudinal direction through the dryer. In the process, the heated dryer air flows through the belt and through the sludge lying on the belt from bottom to top and dries both. At the end of the belt, the sludge falls into the transfer box, is then evenly distributed on the lower belt and transported through the dryer again in the opposite direction. In this process, the sludge is further dried to the required 90% DR. The DR and temperature measurement installed at the end of the lower belt continuously monitors the moisture and temperature of the dried sludge and adjusts the control of the dryer fully automatically. This ensures that the required degree of drying is reliably maintained. The dried sewage sludge is then transported via an angular bucket elevator into a dry material silo. From there, the dried sludge granulate is transported by silo vehicles to the thermal utilisation plant. The exhaust air is cleaned in an acidic and a basic scrubber and then fed into a biofilter.[...]

[...]Sargans, Switzerland High level of user-friendliness increased even further In Sargans, Switzerland's first HUBER Screw Press Q-PRESS ® Q 800.2 was installed in 2017 for dewatering digested sewage sludge. The latest generation of screw press could win the competition against other systems due to its very high operational reliability and user-friendliness, complete stainless steel construction and very low operating costs. The demands on the system are extremely high. An essential factor is the required DR concentration in the dewatered sludge of over 30% with simultaneously clear filtrate quality. Furthermore, fully automatic operation is of great importance for the efficient use of the plant. After the usual system optimisations had been implemented in the first year, the operator expressed the wish for further automation options, especially with regard to decalcification. The reason for this was that the machine had to be descaled every quarter due to the hard water (around 25 °fH or 14 °dH hardness). Along with the planned automatic decalcification, the concept of a torque control for the targeted increase of the DR concentration was also developed. Both questions clearly aimed for an even higher efficiency in operation with optimised personnel deployment. Fully automatic decalcification The deposition process of lime precipitates and other substances that are difficult to dissolve on the screen basket surface and in the filter gaps is gradual. As a result, the freely available surface of the filter basket is continuously reduced, which has a direct effect on the performance of the machine. Since manual descaling is a significant time and cost factor, this operation should be reduced to a minimum. The fully automatic descaling is implemented by using the new rotating spray bar system, which is applied for the standard cleaning of the outer surface of the filter baskets. At a freely selectable interval, a descaling agent is dosed into the water supply line to the spray bar and allowed to take effect for a certain time. In the case of Sargans, this is done at an interval of one week and with a reaction time of about one hour before the system is rinsed normally with service water and then filled with sludge. The fully automatic decalcification achieves the following objectives: Regular descaling of the filter baskets without manual operations Avoid thicker deposits, which would be even more difficult to remove Ensure stable and optimal operating conditions for dewatering Increase the service life of downstream units (impeller of filtrate pump) Reduce downtimes for costly cleaning work. Since the installation of the descaling station at the beginning of 2019, no manual descaling of the HUBER Screw Press Q-PRESS ® Q 800.2 has been carried out in Sargans and the condition of the filter basket as well as the performance of the plant are constantly at a very high level. Load-dependent machine control Due to the high requirements on the DR in the dewatered sludge, the screw press is operated at high load. To ensure the machine would not be overloaded during normal operation, the operating parameters were set conservatively and closely monitored by the staff. With this mode of operation, on the one hand, part of the capacity was not utilised at all and, on the other hand, the effects of the manual interventions were only effective for a short time as the dynamics of the process could not be sustainably influenced by them. With the load-dependent control system for the HUBER Screw Press Q-PRESS ® Q 800.2 implemented in Sargans for the first time worldwide, the operating parameters are adjusted continuously to ensure optimum operation without jeopardising operational safety. The optimised control system enables: Smooth and continuous control of the sludge and flocculant feed and the screw press Operation of the machine in the optimum load range to achieve the best possible DR content in the sludge A simple and extremely effective optimisation option for the operator A shorter automatic start-up of the plant up to the optimum operating point A big “thank you” goes to the constructors at the Saar Wastewater Association and especially to the managing director Peter Müller for supporting the implementation of the presented innovations.[...]

[...]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.[...]

[...]Coarse screens are the protective equipment of a screening system. Their task is not removing the incoming screenings from the water flow, but coarse screens are used to protect downstream finer screening systems (or machine technology in general) in the event that massive amounts of coarse material or extreme-size debris occur. Such unusual events in the operation of a screen include the occurrence of large-volume flotsam (e.g. tree trunks, tyres, etc.), man-sized screenings rolls, suddenly occurring huge quantities of screenings or large debris and sediment loads at the channel bottom. Such disturbing material can - provided that no coarse screen is available - severely impair or interrupt the operation of screening systems and also lead to damage to the respective machines. The art is to select the right coarse screen for the application in question so that the screen reliably detects and removes the impurities from the channel during operation. With the HUBER Multi-Rake Bar Screen RakeMax ® and the HUBER Coarse Screen TrashMax ® , HUBER has two screening systems on the market that cover most of the requirements of common coarse screen systems. But what to do if there are applications and/or channel and structure dimensions where these machines reach their limits? The answer to this question is the new HUBER Grab Screen TrashLift, whose functional principle is really simple: A solid stainless steel shell acts as an "excavator bucket" to clean the channel bottom as well as the bar rack section. This excavator bucket is operated cyclically by a winch system. With this functional principle it is possible to realize channel widths up to 6 m and channel depths up to 40 m with a 90° installation. In order to ensure maximum operational safety and service life of the machine, the HUBER Grab Screen TrashLift is characterised by the following features: Detection of blockages of the bucket carriage in the up and down movement (overload and slack rope detection of the load winches) Long rope service life due to directly acting load ropes / control rope on the bucket and winch drum, no unnecessary rope deflections Safe transport of the flotsam and screenings, even in 90° position, thanks to the active bucket closing mechanism Safe flotsam/screenings discharge through a scraper and swivel mechanism of the bucket at the discharge point[...]

[...]An innovative building block for your digitisation strategy The main duty of the screens installed in the inlet to sewage treatment plants is to protect downstream machines and systems and ensure perfect operation of the sewage treatment plant. When selecting the headworks screens it is usually assumed that coarse material up to a certain maximum size will occur. Increasingly, however, unforeseen material such as cans, wood pallets, large tree branches or even iron rods are also found in sewers. Although such coarse material should definitely not be present in a sewer, there is no possibility to reliably exclude they are there. If such material arrives at a screen and the screen takes it up, this may result in mechanical damage of the screen or downstream systems, such as conveyors, wash presses, etc., and this can lead to severe failures in the operation of a sewage treatment plant. The innovative system HUBER Safety Vision is able to identify critical coarse material and protect machines safely and reliably against damage. Optical sensors continuously monitor the shape and size of the coarse material taken up by the screen. The sensor data are evaluated in real time through digital image processing. Whenever the system detects any impermissible material, a warning message with image is immediately sent to the operating staff. They can decide if the screen is to continue running or stop until the material has been removed. This process reliably prevents blockage or damage of the screen or downstream systems and at the same time increases equipment availability. Another advantage of the HUBER Safety Vision is the preventive identification of explosion risks. Accidents or failures may lead to the ingress or unpermitted feeding of inflammable liquids and gases which can cause an explosive atmosphere in the inlet to a sewage plant even if only small amounts are present in the sewer network. Knowing the explosion risks is essential for the operating reliability of the plants but especially for the health and safety of the operating staff. To ensure reliable monitoring, a sturdy scalable gas alarm device is installed directly on the machine which can trigger an alarm in real time whenever pre-defined limit values are exceeded. HUBER Safety Vision provides the technological preconditions for a variety of applications: Intelligent detection of impurities Continuous monitoring and identification of abnormalities Intelligent preview and early detection of disturbances Continuous transmission of live images Exact determination of the volume and dimensions of screenings by a 3-D scanner and load-dependent control of downstream systems Reduced machine run times Load-dependent adjustment of maintenance intervals Predictive maintenance Reduced maintenance and repair costs Immediate signal from the image processing software to the machine control system if limits are exceeded Detection of explosion risks before they can become dangerous Integration of smart phones, tablet PCs and mobile or stationary displays of a PLC. Due to the variety of possibilities the system provides, HUBER Safety Vision represents an important element in the digitalisation strategy of any sewage treatment plant. Especially the pollution load-dependent control of systems installed downstream of the screen provides a considerable cost saving potential as it reduces unnecessary operation hours and consequential expenses for maintenance and repairs and increases the lifetime of the systems. The impurity detection system HUBER Safety Vision it is possible to identify critical coarse material and protect machines reliably against damage. If the screen is stopped by an obstacle, it is labour-intensive to remove it. At least two persons with suitable tools are necessary to put the screen into operation again. Frequently, they additionally have to repair damage. Warning messages and live pictures can be sent to the staff and varoius devices[...]