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[...]Treatment of polluted stormwater to protect water and soil Road wastewater treatment plants are used for heavily frequented roads. The task of such a plant is to filter rainwater that runs off roads before it is discharged into a body of water or into the ground. Road run-off is stormwater containing coarser solids such as gravel, sand and litter, as well as significant amounts of finer solids such as abrasion from car tyres (microplastics). Road wastewater occurs whenever it rains, and its quantity depends on the amount of rainfall. Technology for Road Wastewater Treatment Plants Intermediate storage and filter system A road run-off treatment plant is characterised by two main features: a basin for intermediate storage and a filter system. Since such a plant cannot be designed to cope with very rarely occurring but extremely high rainfall volumes, an overflow is also provided for relief in the event of excessive amounts of water. The treatment plants for road run-off can be distinguished into natural plants and technical systems. The filter system of a natural treatment plant consists of a soil filter. The technical road run-off treatment plant as a space-saving solution The technical system uses space-saving machine technology for filtration instead of a soil filter. HUBER uses the H UBER Disc Filter RoDisc® for its technical system. The filter discs, which are covered with a filter fabric, retain the finest solid particles in a continuous filtration process and thus reduce the contaminants contained in the road wastewater, such as microplastics, heavy metals and organic pollutants. As both tar and tyre debris have a clear tendency to irreversibly adhere to the filter fabric, thorough cleaning of the filter discs is necessary, which is why the HUBER Disc Filter RoDisc ® is equipped with an automatic system for intensive cleaning.[...]

[...]Increasing operational safety for pumping stations Pumps and lifting units are used where wastewater needs to be lifted to a higher level so that it can be passed further on by gravity. However, the solids contained in the wastewater (coarse materials, foreign matter, fibres) often lead to a failure of the units used, as they cause operational downtimes due to clogging and blockages. Labour-intensive manual cleaning is required to restore the function of the units or, in the worst case, they even need to be replaced. To ensure trouble-free and reliable operation of a pumping or lift station, the installation of an upstream screening system is the best solution. HUBER has special screens and screening systems in its product range, which are especially suitable for pumping stations, shaft structures or lift stations and can be used both for sewage treatment plants and in the sewerage system. This increases the operational safety and availability of the pumping stations and significantly reduces material and personnel costs. For smaller applications, the HUBER Pumping Stations Screen ROTAMAT® RoK4 is particularly suitable, and for larger applications the HUBER Multi-Rake Bar Screen RakeMax ® , the HUBER Multi-Rake Bar Screen RakeMax® CF and the HUBER Grab Screen TrashLift .[...]

[...]Suitable materials and effective corrosion protection for economical solutions The right choice of material for screens and screening machines is a key factor for their reliable and low-maintenance operation. For applications with river water and fresh water, we use 304 and 316L stainless steel. For applications in particularly corrosive seawater with high temperature and salinity, we use stainless steel in combination with corrosion protection as well as corrosion-resistant duplex stainless steel and super duplex stainless steel. All steel parts are pickled and passivated in our own production. For corrosion protection we choose between two principles, cathodic corrosion protection with external current and corrosion protection with sacrificial anodes. Protection of equipment HUBER solutions für corrosion protection Cathodic corrosion protection with external current Impressed Current Cathodic Protection (ICCP) is a proven system for protecting stainless steel against electrochemical corrosion. The basic principle is that the metal to be protected – the protected object – is turned into a cathode, which does not corrode. For cathodic corrosion protection with external current, HUBER works together with a globally recognised specialist. We design and manufacture the system components taking into account the site and installation environment as well as the prevailing operating conditions for the specific project application. Corrosion protection with sacrificial anodes Corrosion protection can also be achieved by using galvanic anodes, the so-called sacrificial anodes. These consist of an electrochemically less noble metal, usually aluminium, zinc or magnesium, which is connected to the protected object through the seawater acting as an electrical conductor. The decisive factor for effective corrosion protection is that the sacrificial anodes are either mounted directly on the protected object or are directly connected to it via a metal cable.[...]

[...]Targeted dosing of chemicals for better clarification performance with less consumption The use of chemicals such as acids, alkalis, flocculants or flocculation aids is necessary in many areas of wastewater treatment and sludge treatment in order to achieve the required process performance. Ideally, the right chemicals should be added in exactly the right dosage to avoid either underdosing or overdosing. While underdosing leads to reduced performance, overdosing leads to increased operating costs and can also have a negative impact on the process. The fluctuations in concentration and volume that often occur in practice make it difficult to achieve exactly the right dosage, and attempts are made to get these fluctuations under control with large mixing and equalisation tanks. The disadvantage here, however, is the space and investment required for basins and aggregates for the necessary homogenisation (e.g. circulation pumps or aerators). Often, however, the fluctuations cannot be completely eliminated despite the equalisation basins, so that in practice manual intervention is always necessary to adjust dosing to the respective situation. In the best case, this manual intervention reduces chemical costs, but leads to increased personnel costs. Optimal Chemicals Dosing for Flotation Systems A typical wastewater treatment process in which chemicals are used is dissolved air flotation . The HUBER Chemicals Dosing DIGIT-DOSE system was developed especially for this process. It reliably ensures that the HUBER Dissolved Air Flotation Plant HDF is always fed with wastewater containing the optimum amount of chemicals. In this way, the best cleaning results are always achieved with minimum costs for chemicals and personnel.[...]

[...]Sustainable Use of our Waters Municipal wastewater contains between 5 and 15 mg/l phosphorus. If phosphorus is not adequately removed during wastewater treatment, it ends up in the receiving waters. In lakes and rivers, phosphorus acts as a nutrient that generally promotes and accelerates plant growth, especially algae growth, which has a negative impact on water quality and thus on the biotic communities in the water body. Reducing phosphorus inputs from municipal wastewater treatment plants is therefore a very important contribution to maintaining or achieving a good ecological status in flowing waters. Three different processes are available for the elimination or reduction of phosphorus at municipal wastewater treatment plants, which are used either individually or in combination: Biological phosphorus elimination Chemical-physical processes Flocculation filtration Flocculation Flocculation Filtration HUBER offers reliable and proven process technology for flocculation filtration, which ensures that the relevant phosphorus limits can be safely met. Flocculation filtration with sand filter The sand filter used is the HUBER Sandfilter CONTIFLOW® , which is a deep-bed type upflow filter that provides filter bed cleaning without interrupting the filtration process. The precipitant (e.g. FeCl 3 solution) is added into the feed line to the filter. Due to the fast reaction time of the precipitant with the ortho-phosphate, the filter bed of the sand filter can be used directly as reaction volume. The precipitated ortho-phosphate is then separated together with other solids in the sand filter and phosphorus concentrations of < 0.2 mg/l can be maintained in the outlet of the sand filter. Flocculation filtration with cloth filter The HUBER Pile Cloth Media Filter RotaFilt® , which consists of several rotatably arranged disc-shaped filter elements, is used as cloth filter. The wastewater with the added precipitant is passed through the filter system and the precipitated phosphate compounds, together with other solid particles still present, are reliably separated by the filter discs. Phosphorus concentrations of < 0.2 mg/l can be maintained in the outlet of the cloth filter. Three Ways to Filter Phosphor Biological phosphorus elimination The Bio-P process, i.e. the increased biological phosphorus elimination, is based on a special process management in biological wastewater treatment. Through the targeted alternation between anaerobic and aerobic conditions, an increased uptake of phosphorus by certain bacteria is achieved. Chemical-physical processes Here, a precipitant (iron or aluminium salts) is added to the wastewater, which precipitates the phosphorus so that it can be separated with the sewage sludge. Flocculation filtration In addition to the aforementioned phosphorus elimination processes, a filter unit is installed in the outlet of the secondary clarifier. With the addition of precipitation and flocculation aids, very extensive phosphorus elimination can be achieved.[...]

[...]Reduce Volume of Industrial Sludge Through Thickening, Dewatering or Drying In the wastewater treatment process, substances are removed from the wastewater and accumulate as screenings or sludge. In addition, biological processes, but also physical and chemical treatment processes such as the flotation process that is frequently used in industrial wastewater treatment, lead to the formation of sludge. Residues can also arise directly from industrial production in very liquid form. Process Technology HUBER solutions for reduction of disposal costs Depending on the upstream process step, the sludge has a water content of 95 to over 99%, that means it consists mainly of water. Since the disposal of such aqueous sludges is difficult and costly, and transport costs are high, these sludges have to be treated further. The following process steps are common: Sludge thickening : water content is reduced to 90 - 95%, the sludge still behaves as a liquid Sludge dewatering : water content is reduced to 60 - 80 %, the sludge is stab resistant Sludge drying : water content is reduced to less than 10%, the sludge is a dry material At least the thickening and dewatering of sludge is common practice directly at the point of origin, i.e. at the industrial plant, whereas sludge drying is only economical for very large quantities of sludge and therefore tends to be carried out in external facilities. Due to the high compaction of sewage sludge and process sludge, the dry residue (DR) is increased, transport quantities and thus transport costs are reduced to a minimum, and the sludge is optimally prepared for subsequent treatment steps. HUBER has decades of experience in dimensioning and selecting the optimum machine technology for each sludge treatment application. The HUBER Disc Thickener S-DISC , HUBER Screw Press Q-PRESS® and HUBER Screw Press S-PRESS are mainly used for industrial applications. For preliminary assessment, laboratory tests can be carried out and container-based pilot plants can be provided.[...]

[...]Reliable compliance with effluent values In conventional municipal wastewater treatment plants, the final settling tank is the last stage of the wastewater treatment process. The purpose of the secondary clarifier is to allow the activated sludge flocs and the finest suspended solids to settle and to discharge the clarified wastewater into the receiving water as free of solids as possible. Increasing hydraulic loads and changes in the settling behaviour of the activated sludge are the reason why wastewater treatment plants often do not reliably meet today's minimum requirements for solids retention in the effluent. An increased solids content in the effluent inevitably causes an increased COD, BOD and phosphorus load in the effluent. This in turn results in higher effluent charges and oxygen-consuming pollution of receiving waters. Reliable Solutions for Solids Retention HUBER offers proven and reliable solutions for solids retention in the outlet of wastewater treatment plants. Depending on the requirements and general conditions, one of the following solutions can be applied: Microscreening: The HUBER Disc Filter RoDisc® consists of several rotatably arranged, disc-shaped microscreen elements. A filter cloth made of stainless steel or polyester from 10 μm is used as screening medium. Sand Filtration: The HUBER Sandfilter CONTIFLOW® is a deep-bed type upflow filter where the filter bed is cleaned without interrupting the filtration process. The filter medium is sand. Cloth filtration / Pile cloth media filter: The HUBER Pile Cloth Media Filter RotaFilt® consists of several rotatably arranged, disc-shaped filter elements. Particulate matter is reliably retained in the three-dimensional pile fabric structure. In addition to the retention of solids, phosphorus elimination and micropollutant removal are playing an increasingly important role in the field of advanced wastewater treatment .[...]

[...]Screens for solids retention at sewer overflow structures for the protection of water bodies Structures with overflow are used to relieve the sewer system during rainfall. They either discharge the excess water/sewage/combined water directly into the receiving watercourse or initially store it temporarily. In practice, different types of structures can be found: Stormwater overflow: As soon as the water level in the sewer rises above a maximum permissible level, wastewater is discharged into the receiving water via an overflow channel. Stormwater overflow tank: When the rain weather begins, the wastewater is stored in a tank. When the tank storage capacity is reached, the wastewater is discharged via an overflow into the nearest watercourse. At the end of the storm event, the contents of the tank are discharged back into the sewer system and further to the wastewater treatment plant. Stormwater retention tank: These basins are only used for temporary storage of combined sewage or wastewater and do not have an overflow into a receiving water body. Sewer with storage capacity and overflow: Such reservoir sewers are very large sewers that can store wastewater. If the storage sewer is equipped with an overflow, it functions like a stormwater overflow basin. HUBER Screening Systems HUBER offers proven screening systems for overflow structures for all tanks, basins and sewers that discharge wastewater into a body of water. These systems reliably retain solids from combined sewage or wastewater, and only mechanically pretreated wastewater enters the watercourse. This minimises the discharge of contaminants into the environment. The retained screenings can either be fed to the sewage treatment plant via the sewer system or discharged on site.[...]

[...]HUBER solutions for permanent safe drinking water supply and distribution In water networks, many manholes are installed to accommodate branches, shut-off valves, backflow preventers and sampling points. The manholes must be securely covered and sealed, and well ventilated. In addition, they must be safely accessible via step irons or ladders. HUBER supplies permanently safe stainless steel components for manhole equipment: Manhole covers Venting chimneys Safety access ladders and safety climbing systems with guard rail Entrance aids Pre-fabricated stainless steel manholes HUBER stainless steel products for manhole equipment offer high quality, functionality, safety and durability. All products are made of high quality stainless steel and are passivated in our own acid bath so that all surfaces are optimally protected. An excellent service life as well as the efficient HUBER production in large series make HUBER products particularly competitive.[...]

[...]Reducing screenings volume and disposal costs The screenings from municipal wastewater treatment mainly consist of household waste-like materials, faeces, paper and mineral particles. The screenings volume depends on the aperture size of the screening system. The solids content of municipal, untreated screenings varies from 5 – 20 %, depending on the type of screen. The organics contained in the screenings amount on average to approx. 90 % of the dry residue [DR]. The objectives of screenings treatment are: Dewatering of the screenings and thus reduction of screenings weight and volume. This also reduces the disposal costs for the screenings. Return of easily degradable carbon to the wastewater treatment process. Improving hygiene conditions for sewage treatment plant personnel. Wash Presses The best type of screenings treatment is screenings wash presses By adding wash water and mechanical energy, faeces and suspended organic matter are washed out of the screenings in a wash press and returned to the wastewater, thus positively influencing the C / N ratio of the wastewater to be treated. After washing, the screenings are well compacted so that the water content in the washed screenings is significantly reduced. Depending on the selected washing process and press type, a weight and volume reduction of up to 80 % can be achieved. The weight and volume reduction also means a reduction in disposal volume and thus directly influences the costs that have to be paid for the disposal of screenings. HUBER has extensive experience in the design of screenings treatment plants and has different types of wash presses in its product program. HUBER also has the right solution for transporting screenings to the screenings treatment facility and feeding screenings from containers.[...]