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[...]The first step of operationally reliable and efficient wastewater treatment The separation of solids in wastewater with screens and fine screening systems is the first step in municipal and industrial wastewater treatment. The main task here is to remove all coarse and foreign materials that could inhibit or hinder the function of subsequent wastewater treatment stages. The following factors, among others, must be taken into account when planning an operationally reliable solids separation solution: Maximum required hydraulic throughput Expected screenings quantities Required bar spacing or [...]

[...]Reducing screenings volume and disposal costs The screenings from municipal wastewater treatment mainly consist of household waste-like materials, feces, 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 [...]

[...]Minimize 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 [...]

[...]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 micron. The average particle diameter of typical powdered activated carbons is approximately in the range of 10 micron to 50 micron. For the elimination of micropollutants, the powdered activated carbon is added directly[...]

[...]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 behavior of the activated sludge are the reason why wastewater treatment plants often do not reliably meet today's minimum requirements for solids retention[...]

[...]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 [...]

[...]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 [...]

[...]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[...]

[...]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 behavior. 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[...]

[...]Optimization of existing treatment concepts through adapted machine technology Industries that produce wastewater with above-average pollution levels must either pre-treat it before discharge into the sewer or treat it completely biologically before it can be returned to water bodies. The relevant regulations result from the Water Resources Act, or from local statutes and environmental legislation. Since these industries can usually provide wastewater treatment with comparatively few resources, necessary optimizations are often not undertaken, and this is reflected in particular in increased [...]