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[...]Various solutions for conveying sewage sludge The heart of an economical sludge dewatering system is the HUBER Screw Press Q-PRESS® , which is in use in thousands of installations worldwide. However, the right solution for the subsequent transport of the dewatered sludge into the provided containers is also of great importance for the implementation of an optimal and practicable dewatering process. HUBER offers various solutions for container filling, which can be differentiated in terms of sludge volume or sewage treatment plant size, number of containers and degree of automation. Solutions for Conveying Sewage Sludge into Containers Plant capacity < 20,000 P.E. – loading of 1 - 2 containers With this size, a distribution system and automation is usually not required for feeding the sludge into the containers. For easy loading into two containers, HUBER SE offers a simple adjustable chute for switching between the containers. Depending on the customer's requirements and after clarification of the technical prerequisites, container feeding can also be partially automated with the adjustable chute. Plant capacity 20,000 - 50,000 P.E. – loading of 2 - 4 containers Here, simple swivelling screw conveyors have established themselves on the market, which are usually moved to the respective container position by hand using a swivel motor. The containers are placed in a circle around the pivoting screw conveyor as appropriate for the space available. This system is used here because the dewatered sludge produced corresponds to about one container per day and so the plant operator only has to move the screw conveyor by hand 1-2 times a day. The working radius of the swivelling screw is usually in the range of 5 - 6 m. Since the screw is positioned by hand, there is no need for accurate container placement. Plant design capacity approx. 50.000 PE – loading of 3 - 6 containers For plant sizes around 50,000 PE, containers are usually lined up on a container transport unit and fed via a distribution screw with an intermediate discharge solution. In order to make the best possible use of the container volume, the containers have to be moved or the cone of material in the container has to be distributed manually. To keep the workload as low as possible, additional cross conveyors with the corresponding necessary discharge gates are sometimes used. In order to enable automatic feeding, precise positioning of the container is necessary with a corresponding solution.[...]

[...]Safe working in manholes – safe opening and access Manholes fulfil an important task in water supply and wastewater disposal. They are used for example where shut-off fittings in pipelines must be accessible, or to control sections of very long pipelines, and for aeration/deaeration or access to complex installations (e.g. well shafts, pressure reduction shafts). Easy and safe access must be ensured in each individual application. Most of the manholes are entered from the top. This means that the operating personnel must open the manhole cover in order to then be able to use an entrance aid for safe access. They must move over the manhole opening already when opening the cover. HUBER offers various solutions for safe working in manholes HUBER Manhole Covers : HUBER offers a wide range of stainless steel manhole covers to meet various requirements. They include raised, flush-fitting, burglar-resistant, flood-proof, pedestrian and load-bearing manhole covers. HUBER Guard Grate : After opening the manhole cover, there is a high risk of falling down into the manhole. Therefore, it is recommended to install a guard grate. With the HUBER Guard Grate you are well protected. HUBER Safety Access Ladders : To ensure easy and safe descent into the shaft, a safety ladder is usually installed. According to the Accident Prevention Regulations (UVV), fall protection is mandatory from a fall height of 3 m or 5 m. HUBER offers safety ladders, safety access ladders with guard rail as well as safety climbing devices with guard rail for the specific application. HUBER Entrance Aids : The purpose of access aids is to enable safe climbing on a safety ladder. For this purpose, HUBER offers various models of entrance aids to ensure the best access for different applications.[...]

[...]All-round building protection with tested security We must eliminate the risk of any manipulation of our drinking water and its quality. Access to the free water surface must be prevented and the plants protected against vandalism and theft. The exterior shell of objects should therefore be designed as a mechanical barrier with a long resistance time. Criminal investigation departments recommend, among other measures, the use of security doors certified to resistance class RC3 or RC4 in compliance with DIN EN 1627. For vertical access, it is best to use tested security manholes covers . Certified according to DIN EN 1627 Only certified products are able to meet the high requirements. All openings and entrances should be of the same security class. HUBER security products meet the high requirements of DIN EN 1627, resistance class RC3 or RC4. Beside careful manufacture and matured product design the material stainless steel ensures high mechanical strength. Due to its robustness, stainless steel offers maximum mechanical security against boring, sawing and grinding tools. The extensive HUBER product range offers: Attack-proof manhole covers Security doors Security louvres[...]

[...]Grit washing for Reduction of the Organic Matter Contained in Grit Grit and mineral substances from the grit chambers of municipal wastewater treatment plants usually contain a large to very large proportion of organic substances, which have settled in the grit chamber together with the grit. Grit washing has become an established process for the treatment of grit from grit chambers over the last decades. HUBER Grit Washing Plants have been in operation worldwide for more than 25 years and have set the standard for modern and efficient processing of grit from wastewater treatment plants to produce a valuable product for reuse. Process The Target of Grit Treatment Due to the proportion of organic substances, the heterogeneous grit-organic mixture has a relatively low dry residue of 40 – 70 % DR and a relatively high loss on ignition of up to 80 %. The purpose of a well-performing grit treatment system is to first remove the grit down to a grain size of 0.20 mm and then to separate the valuable material sand and the mineral fraction from the organic contaminants mentioned. The treatment of grit produces a valuable resource with a low loss on ignition (< 3 %) and a high dry residue (> 90 %). This reduces disposal costs and provides a product that can be reused as a secondary raw material.[...]

[...]Highest purification quality and reuse of wastewater The membrane bioreactor process is a biological wastewater treatment process that works according to the principle of the activated sludge process (aerobic biological treatment of organically polluted wastewater with activated sludge), except that the secondary sedimentation tank, which ensures biomass retention, is replaced by membrane filtration. Membrane Technology Membrane Bioreactor Process The use of membrane technology greatly reduces the space required, as the structures necessary for the treatment process at municipal and industrial plants can be made up to 70 % smaller. In addition, the purification performance of the sewage treatment plant will be increased. By using ultrafine ultrafiltration membranes, even the smallest solid particles are reliably retained. Problems with the secondary clarifier such as scum or sludge drift are no longer a problem with this technology due to the move away from classical sedimentation to membrane filtration. HUBER offers the membrane activated sludge process as a standardised plug&play solution in containerised design as a MENA-Water MBR sewage plant .[...]

[...]Efficient wastewater pre-treatment to achieve indirect discharge quality Compared to municipal wastewater, the generated industrial wastewater is much more polluted, and the composition of the wastewater varies greatly. In particular, pollution by organic or inorganic substances depends on the sector of industry, the product range, the production methods and, last but not least, the individual usage behaviour. Many industries discharge their wastewater directly into the sewer and must therefore comply with certain limits for COD and solids, ensure pH neutrality and reduce grease content to a minimum. Industries that operate their own biological wastewater treatment plant must also carry out this pre-treatment in order to ensure the functionality and economic operation of the plant. . PROCESS TECHNOLOGY HUBER solutions to reduce COD, fat and solids in industrial waste water Part of this industrial pretreatment is usually: Screens for mechanical preliminary treatment Grit traps (where grit is present) Dissolved air flotation plants with chemical treatment stage Sludge treatment for resulting flotate sludge Depending on the industry sector, type of wastewater and degree of contamination, the right machines and components have to be selected, as for example high grease contents require screen cleaning with high pressure or hot water. HUBER has decades of experience in dimensioning and selecting the optimum machine technology for each industry wastewater pre-treatment application. As different requirements also demand different types of systems, HUBER has developed a wide range of various screens, fine screens, flotation plants and sludge treatment systems, which are in use in thousands of installations worldwide. Separated and compacted screenings and grit are disposed of, while separated flotate (= organics) is usually further utilised in anaerobic sludge treatment as co-substrate or in approved biogas plants.[...]

[...]Production increase or conversion of production make it necessary to upgrade the wastewater treatment systems For reasons of cost and efficiency, industrial wastewater treatment plants are often planned and constructed according to the current capacity utilisation of the facilities. Changes in production and product changes, capacity increases and other factors often lead to plants being too small at the time of commissioning or after a few years already, and the required effluent qualities can no longer be achieved. While machine technology that is too small can often be easily adapted to the changed values by adjusting the size, an overloaded biological purification system or a secondary clarifier is much more complicated to upgrade. A tightening of the discharge limits (e.g. with regard to phosphorus) also poses a challenge. Process Technology HUBER solutions for reliable compliance with discharge limits For the upgrading of industrial wastewater treatment systems, HUBER offers the right customised machine and technology for the specific task: Prevent sludge drift and increase COD reduction: HUBER Dissolved Air Flotation Plant HDF Increase the biological treatment capacity (full or partial flow): HUBER Dissolved Air Flotation Plant HDF HUBER Drum Screen LIQUID Phosphorus elimination: HUBER Dissolved Air Flotation Plant HDF HUBER Pile Cloth Media Filter RotaFilt® HUBER Sandfilter CONTIFLOW® Solids retention and solids polishing: HUBER Pile Cloth Media Filter RotaFilt® HUBER Sandfilter CONTIFLOW® HUBER Disc Filter RoDisc® Reduction and elimination of micropollutants: HUBER Pile Cloth Media Filter RotaFilt® HUBER Active Carbon Filter CONTIFLOW® GAK[...]

[...]Process engineering solutions for the treatment of drinking water For the production of drinking water (especially when surface water is used), physical process steps are often necessary to remove solids of different types and sizes. HUBER has customized mechanical and process engineering solutions for the various applications: Specially developed screens for water abstraction remove all inadmissible coarse and solid matter from the raw water from rivers and seas. If required, suitable devices for fish protection can also be provided. Particularly in the case of machine technology for seawater desalination plants, attention must also be paid to proper corrosion protection. Any necessary separation of fine particles and suspended solids can be accomplished with the HUBER Sandfilter CONTIFLOW® in a continuous process and without interrupting plant operation. An alternative to the sand filtration process is the HUBER Disc Filter RoDisc® . With a fine mesh, it retains even the finest particles and flocs. The sludge produced during drinking water treatment can be dewatered economically with the HUBER Screw Press Q-PRESS® machines.[...]

[...]Minimise wear and increase operating reliability For the operating safety and reliability of wastewater treatment plants, it is necessary to separate the grit transported with the wastewater and other mineral materials from the putrescible organic matter. For this purpose, grit chambers of various designs are used in practice. Depending on the type of grit trap, grease can also be separated in addition to grit. The removal of grit from the wastewater serves to prevent operational troubles, such as grit sedimentation (in aeration tanks and digesters), increased wear (of pumps, stirrers) and clogging (of removal hoppers or pipelines). In addition, it is also used to reduce material wear of mechanical sludge treatment equipment (e.g. centrifuges, etc.). The aim is to separate as much as possible of the grit and inorganic material up to 0.20 mm grain diameter. Different types of HUBER Grit Chambers Especially grit chambers such as the HUBER Grit Trap GritWolf® are capable of separating fine sand (“sugar sand”) of significantly smaller grain size with a high separation efficiency. Due to the considerable organics content in the classified grit, longitudinal grit traps are nowadays additionally equipped with an aeration system. This partly prevents the organic matter from settling in the grit chamber and, at the same time, floating matter (grease) can be partly blown up by the injected air and retained in a separate grease trap. Special grease removal systems remove the grease automatically and pass it on for further utilisation. Different types of HUBER Grit Chambers are available for the separation of grit and grease from wastewater. The grit separated in the grit chamber is usually freed from organic matter in a subsequent grit washing process .[...]

[...]Elimination and reduction of micropollutants with the PAC process Trace substances can be removed from wastewater with the help of powdered activated carbon (PAC), as the micropollutants adsorb to the activated carbon. Powdered activated carbon is ground activated carbon. According to DIN 12903, at least 95 percent of the mass fraction must have a grain size of less than 150 µm. The average particle diameter of typical powdered activated carbons is approximately in the range of 10 µm to 50 µm. For the elimination of micropollutants, the powdered activated carbon is added directly to the wastewater to be treated. The activated carbon can be added at different points in the wastewater treatment process (simultaneous process). In the "Ulm process", a separate adsorption tank is used after the biological stage. There, fresh activated carbon is added to the treated wastewater. PAC Powdered Activated Carbon In principle, it is important that the process ensures sufficient contact time so that the trace substances can adsorb to the powdered activated carbon. The powdered activated carbon must then be separated from the treated wastewater. This is usually done after precipitant addition in a sedimentation tank, where some of the separated carbon is discharged as excess carbon together with the excess sludge and some is returned to the contact tank as return carbon. Due to the recirculation, the activated carbon remains in the wastewater treatment process for several days. It is very important that the treated wastewater is free of activated carbon before it is discharged into the receiving water. The powdered activated carbon (PAC) should be separated as completely as possible from the treated wastewater. For this reason, a downstream filtration stage (polishing filter) is necessary that is able to retain any remaining fine carbon particles. The HUBER Pile Cloth Media Filter RotaFilt ® is an ideal product solution for this purpose. The polishing pile cloth filter reliably retains even the finest carbon slip that could not be separated in the sedimentation tank. As an alternative to the pile cloth media filter, the HUBER Sandfilter CONTIFLOW® can be used as a proven and reliable polishing stage to retain the ultrafine activated carbon particles.[...]