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[...]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 [...]

[...]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[...]

[...]Reliable conveying technology for grit and mineral solids Grit is separated by sedimentation in grit chambers during wastewater treatment. The grit settling at the bottom of the grit chamber is then removed – usually discontinuously – from the grit chamber. Grit Feeding and Conveying HUBER offers different designs of grit traps for grit separation. All HUBER grit traps are equipped with an appropriate conveyor so that the separated grit can be discharged into a container or passed to further treatment in a grit washing plant . Depending on the grit chamber design, either grit discharge pumps or [...]

[...]Various solutions for conveying dewatered and dried sewage sludge Sludge transport plays an important role in the planning and construction of sludge drying plants. On the one hand, the dewatered sewage sludge has to be brought into the dryer and on the other hand, the fully or partially dried sewage sludge has to be transported away from the dryer. When designing a particular transport solution, important criteria include not only the required transport capacity but also the sludge properties (moist, dry, sticky, dusty,...) and the desired degree of automation. Feeding and Removing Supply and[...]

[...]From the screen to the screenings wash press – reliable and operationally safe solutions for conveying screenings HUBER offers two different solutions for providing tailor-made and project-specific conveying systems for wet and untreated screenings: Screenings transport by launder channel The screenings to be treated are discharged from one or more screens into the launder channel. Sufficient wastewater or process water is used to flush the screenings into the screenings wash press. The flushing water also serves as wash water for screenings washing. HUBER Launder Channels HLC can be [...]

[...]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,[...]

[...]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[...]

[...]Complete process technology for the treatment of surface water Surface water can be treated into drinking water using the following physical, mechanical and chemical process steps: Coagulation: Dosing a coagulant to the raw wastewater Flocculation: Dosing a flocculant, and possibly a flocculation aid, to the raw wastewater results in the formation of flocs. Clarification: The flocs are separated from the water e.g. with a lamella separator. Filtration: The clarified water is then filtered to separate even the smallest solids and flocs. Depending on the requirements, single-layer or multi-layer[...]

[...]Denitrification in the sand filter for nitrogen reduction Nitrogen is a basic building block of life and nature and, like phosphorus, is indispensable as a nutrient for all humans, animals and plants. Municipal wastewater contains various nitrogen compounds (including organically bound ammonium and nitrate). The removal of nitrogen is one of the main tasks of municipal biological wastewater treatment, because without sufficient nitrogen removal, the discharge of wastewater into receiving waters has significant negative effects on water quality and thus on flora and fauna. Denitrification Downstream[...]

[...]Clean and safe solutions for drinking water applications Drinking water must go from the drinking water reservoir into the mains in a hygienically perfect condition. There are therefore high demands on the structural design and hydraulic equipment of water reservoirs. Typically, the water surface in a reservoir is constantly in motion. While air streams out during filling, the water reservoir draws in ambient air during emptying. In this respiration process, particles contained in the air enter the drinking water along with oxygen and nitrogen. Since organisms such as germs, viruses, spores or [...]