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[...]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 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 screenings treatment is the screenings wash press By adding wash water and mechanical energy, feces, 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.[...]

[...]Screens and Fine Screens Reliable screens for any application Innovative technology from one source Reliable screens for any application Innovative technology from one source All HUBER Screens and Fine Screens Categories ROTAMAT® Screens Bar Screens Belt Screens Rope and Chain Pull Rakes STEP SCREEN® Ultra Fine Screens Sludge Acceptance Plants Stormwater Screens The HUBER screening program comprises a wide variety of screen systems and enables us to offer the perfect solution for any installation conditions, flow rates, bar spacings and mesh sizes. Mechanical treatment is indispensable as the first process step of preliminary treatment of wastewater, both for STP inlets and other fields of application, such as process water treatment. Coarse material has to be removed in order to protect the subsequent treatment steps against damage/pollution. It is the goal to completely separate floating, settling and suspended material, depending on the screening elements size, and remove the material prior to discharging it. Hygienic conditions and the requirement for safe operation and low maintenance is becoming increasingly important. For municipal STPs additional screenings washing is utilised to enhance downstream biological treatment. FAQ Frequently Asked Questions What influences the separation efficiency of screens? The size of the opening width on the one hand and the shape of the screening element on the other. With one-dimensional screening elements such as bars, the separation efficiency is generally lower than with two-dimensional elements such as perforated plates, mesh, etc. This is mainly due to the fact that it is very difficult for long-fibre material such as hair to pass through a perforated plate. Which screen type can be used as both a coarse screen and a fine screen? This requirement can only be met by a screen that covers the full range of screen opening widths from fine to coarse screens. In addition, the screen bars must be designed with the respective geometry to meet the corresponding requirement. A typical screen that fulfills all these requirements is our HUBER Multi-Rake Bar Screen RakeMax® Which screens are particularly suitable for deep channels? Machines with a steep installation angle are best suited for such applications. This screen installation option allows the installation space to be very compact, especially in the direction of flow. Typical examples are our HUBER Multi-Rake Bar Screens RakeMax® and RakeMax® CF as well as the HUBER Belt Screen EscaMax® , HUBER Coarse Screen TrashMax® and HUBER Grab Screen TrashLift .[...]

[...]Reliable water intake systems for open waters HUBER offers its customers a comprehensive portfolio of innovative mechanical treatment systems for water intakes, for both new plants and the modernization of existing plants. The systems are customized to the individual needs and the required water quality of each project. Customers benefit from our decades of expertise for particularly stable, reliable, and fully automated machines with the best hydraulic properties for maximum separation rates. Depending on the application and installation challenge, our solutions include multi-stage screens and screening systems that are optimally matched to each other. Process Technology HUBER solution for water intake Preliminary screening Preliminary screening is the first step in any water extraction process to remove large or medium-sized pollutants of more than 0.4 in. / 10 mm, such as leaves, tree trunks, plastic containers, plastic film, debris, seaweed, and jellyfish. Mainly grab screens and multi-rake bar screens are used for this purpose. HUBER Grab Screen TrashLift HUBER Coarse Screen TrashMax® HUBER Multi-Rake Bar Screen RakeMax® V Fine screening For the removal of fine contaminants in the range of 0.04 in. up to 0.4 in. / 1 mm up to 10 mm, self-cleaning and fully automatic belt filter screens are mainly used. They are suitable for filtering large flow rates in a water intake with a relatively fine degree of filtration. Depending on the required clean water quality of the downstream processes, the screen elements are equipped with filter mesh or with perforated plate. This ensures optimum reliability with maximum efficiency. HUBER belt filter screens are available in all sizes, layouts, and flow rates. Depending on the flow direction, a distinction is made between HUBER Band Screen CenterMax® : Screen of the "center-flow" type. The filter elements are installed parallel to the flow direction of the water intake and move vertically. The water flows from the inside to the outside. HUBER Band Screen DualMax® : Screen of the "dual flow" type. The filter elements are installed parallel to the flow direction of the water intake and move vertically. The water flows from the outside to the inside. HUBER Band Screen DiscMax® : Screen of the "through-flow" type. The filter elements are installed in the direction of flow and move vertically. The water flows in a straight line through the filter belt screen. Micro screening For applications requiring high purity and removal of finest particles in the range of a few micron, such as mussel larvae, a micro screen is available as an option. HUBER Drum Screen LIQUID HUBER Disc Filter RoDisc® Shut-off devices In addition to screen technology, HUBER also supplies shutoff devices as penstocks, and stop logs for regulating water flows during water abstraction, and for maintenance of water intake infrastructures. The stop logs and penstocks withstand highest water pressures and have a high load capacity even with hard and bulky debris in the water.[...]

[...]Seefelden, Germany The Seefelden sewage treatment plant in the Überlinger See wastewater association on Lake Constance with 70,000 population equivalents is to receive advanced wastewater treatment to remove trace substances. The heart of the new treatment stage will be a process combination of ozonation and activated carbon filtration – on a technical scale that has never been realized in Germany before. For this showcase project, HUBER will supply 24 Active Carbon Filters CONTIFLOW® GAK for biological post-filtration and adsorption of trace substances after the ozonation stage. Investment volume 7.4 million euros: Construction started in spring 2021, planned commissioning in fall 2022 Construction of the new treatment stage, which will in future treat an average of 650 m³ of wastewater per hour, corresponding to an annual volume of around 5.6 million m³, began as early as spring 2021. Commissioning of the project, in which the wastewater association (“Abwasserzweckverband”) is investing 7.4 million euros, is scheduled for fall 2022. Chief Technology Officer Dr. Johann Grienberger: “This project is a role model – for Germany and worldwide” “Advanced wastewater treatment must and will become an even more important topic in the coming years,” says Dr. Johann Grienberger, Chief Technology Officer of HUBER SE. “HUBER is already supplying its technologies and products for the reliable elimination of micropollutants in wastewater in a number of projects – and the renovation of the Seefelden wastewater treatment plant is one of them. It is Germany’s largest combined process for the removal of trace substances and serves as a role model: not only for the whole of Germany, but worldwide.” HUBER Active Carbon Filter CONTIFLOW® GAK: Adsorptive elimination of micropollutants from the wastewater stream using granulated activated carbon The HUBER Active Carbon Filter CONTIFLOW® GAK is an upflow activated carbon adsorber filled with granulated activated carbon. It removes micropollutants from the wastewater stream adsorptively and operates in continuous mode. This means that no feeding pauses are necessary for the cleaning of the activated carbon. As the influent flows slowly through the activated carbon bed from bottom to top, dissolved organic substances such as trace contaminants are adsorbed onto the large inner surface of the activated carbon. The purified water flows out through a weir in the upper part of the filter. As the pressure drop increases, the activated carbon is gently conveyed from the bottom of the hopper into the scrubber at the top, where it is freed from residual particulate matter. The particles are separated with a small partial flow, the so-called wash water. The activated carbon, cleaned of solids but still partially loaded with micropollutants, then falls back down onto the filter bed, creating an internal activated carbon cycle. As operation progresses, the loading of the internal surface of the carbon slowly increases. 135 million cubic meters of drinking water annually for four million people: Advanced wastewater treatment separates out hazardous trace substances Thanks to the introduction of advanced wastewater treatment at the Seefelden wastewater treatment plant, hazardous persistent trace substances such as pharmaceutical residues, hormones and flame retardants will be reliably separated in the future, even before they enter Lake Überlingen. This part of Lake Constance supplies around four million people in large parts of Baden-Württemberg with around 135 million m³ of drinking water every year. Former Minister of the Environment of Baden-Württemberg: “Are a model nationwide” “This is good news for the Lake Constance district and for water protection in the state,” said former Environment Minister Franz Untersteller in the official press release from the Baden-Württemberg Ministry for the Environment, Climate and Energy Management. “We are a role model nationwide in this regard and are doing a great deal in this way to preserve and strengthen the ecological habitat of water bodies, which is of outstanding importance, especially at Lake Constance.” As a precautionary measure, he said, the ministry began equipping wastewater treatment plants on particularly sensitive bodies of water with the fourth treatment stage several years ago.[...]

[...]Advanced Wastewater Treatment HUBER solutions for removal of very fine solids and dissolved organic trace substances by means of micro screening, filtration and adsorption. Solids Retention HUBER offers proven and reliable solutions for solids retention in the outlet of wastewater treatment plants. In addition to sand and disc filters, a cloth filter is also available for polishing filtration. Phosphorus Elimination For flocculation filtration and the elimination of phosphorous, HUBER offers reliable and proven process technology, which ensures that the respective phosphorus limits to be complied with can be safely met. Biological Activated Filtration With downstream denitrification in a sand filter during municipal wastewater treatment, nitrate limit values can be reliably met. Elimination of Trace Substances HUBER offers solutions for the elimination of trace substances and micropollutants from wastewater with granulated activated carbon (GAC) and powdered activated carbon (PAC). Membrane Activated Process The membrane activated sludge process is a biological wastewater treatment process that works according to the principle of the activated sludge process, but the secondary sedimentation tank for biomass retention is replaced by membrane filtration unit. The wastewater treatment process of a conventional municipal sewage treatment plant consists of a mechanical and a subsequent biological treatment stage. Increasing demands on the quality of the treated wastewater, however, increasingly require additional treatment stages, which are often referred to as third and fourth treatment stages, or collectively as “advanced wastewater treatment”. The goal of advanced wastewater treatment is the reduction of one or more of the following pollutants: solids, COD, BOD, phosphorus, nitrate, micropollutants and germs. HUBER is a competent partner for the implementation of different processes for advanced wastewater treatment: Solids reduction : reduction of suspended solids, COD and BOD before discharge of the wastewater into the receiving water or as a preliminary stage for further treatment Phosphorus elimination : reduction of phosphorus before discharge of treated wastewater into water bodies Micropollutant elimination : adsorptive and oxidative removal of micropollutants Biologically activated filtration : denitrification in sand filters Membrane activated sludge process : solids-free treated wastewater FAQ Frequently Asked Questions What is meant by tertiary treatment? In wastewater treatment, tertiary treatment means the third treatment stage and refers to processes of advanced wastewater treatment in which a further reduction of nutrients (nitrogen and/or phosphorus) takes place. The first two stages of wastewater treatment are mechanical treatment (primary treatment) and biological treatment (secondary treatment). What is meant by quaternary treatment? In wastewater treatment, quaternary treatment means the fourth treatment stage and refers to processes of advanced wastewater treatment in which micropollutants are eliminated. The first three stages of wastewater treatment are mechanical treatment (primary treatment), biological treatment (secondary treatment) and phosphorus and/or nitrogen elimination (tertiary treatment).[...]

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[...]Sludge Acceptance Plants Sewage sludge screens and septage receiving stations for efficient acceptance and treatment of septic sludges HUBER Sludge Acceptance Plant ROTAMAT® Ro3.1 Sludge Acceptance Plants | Machines for Sludge Screening HUBER Sludge Acceptance Plant ROTAMAT® Ro3.3 Sludge Acceptance Plants HUBER Sludge Acceptance Plant RotaShield® Sludge Acceptance Plants | Machines for Sludge Screening Efficient system solutions and technologies for efficient septic sludge treatment For any type of septic sludge Reliable separation of all disturbing material Dependable and reliable in operation HUBER provides complete systems and processes for septic sludge treatment. Our equipment, as proven during many years of experience, is especially suited for septic sludge treatment. Hundreds of HUBER plants for septic sludge treatment have been installed worldwide. Septic sludge is typically delivered in tanker vehicles. Depending on the size of the WWTP, it may be pumped into a balancing tank from where it is continuously fed to the plant. Direct feeding without prior balancing is possible at larger plants. In any case, removal of coarse material, such as hygienic products, plastic material, etc., from the septic sludge is necessary. There are several requirements for good septic sludge treatment: High capacity to minimise waiting time of tanker vehicles High separation efficiency to achieve excellent separation of non-degradable material Automation to minimise operator attendance Complete encasement to eliminate odour annoyance Reliable operation without impairment by grit and gravel Integrated screenings washing and compaction to produce screenings suitable for landfill and to reduce their weight and disposal costs To meet these requirements HUBER developed special machines and plants that have proven their efficiency and reliability in hundreds of installations. There are three options of septic sludge disposal on sewage treatment plants: Introduction into the wastewater flow Introduction into the sludge flow Introduction partly into the wastewater, partly into the sludge flow FAQs Frequently Asked Questions What are faecal sludge acceptance stations used for? Wherever residential buildings are not connected to a sewer system but use a decentralised domestic sewage treatment plant, faecal sludge accumulates. This faecal sludge is disposed of via collection vehicles and transported to a central sewage treatment plant or a special faecal sludge processing facility for treatment. The collection vehicles usually empty the faecal sludge into special receptions stations, also referred to as sludge acceptance plants. What is the advantage of using a sludge acceptance plant for faecal sludge? Using a sludge acceptance unit before the faecal sludge is fed into the wastewater treatment plant will clean the raw material from undesired matter, such as sanitary products and plastic articles, etc. This cleaning is necessary to keep the load on the sewage treatment plant resulting from the introduced faecal sludge as low as possible. What are components of faecal sludge? Faecal sludge is the sewage sludge from domestic sewage treatment plants. Faecal sludge usually consists of wastewater with a concentrated content of faeces, food waste, toilet paper, sanitary products as well as mineral components. For the treatment of faecal sludge, a multi-stage system consisting of coarse screen and grit trap can be useful before the faecal sludge is discharged into the sewage treatment plant.[...]

[...]Reliable pre-treatment for septic sludge Wherever wastewater is not fed to a sewage treatment plant via the sewer system, but is treated decentrally, septic sludge is produced. This septic sludge collects either in simple septic tanks or in more modern small wastewater treatment plants and must be removed at regular intervals to be treated in a central plant. Where possible, this is done at a centralized wastewater treatment plant with sufficient surplus capacity; but where such a plant is not available nearby, a separate onsite plant for the complete treatment of septic sludge can also be built. Septic Sludge Treatment of septic sludge Septic sludge is usually delivered by tankers and must be screened of coarse material, contaminants such as sanitary products, and plastic particles, and other pollutions before further treatment. This cleaning is necessary for the reliable and economical operation of subsequent stages of septic sludge treatment or co-treatment of the sludge in sewage treatment plants. Depending on the size of the treatment plant, it is advisable to first store the septic sludge in buffer tanks after mechanical pre-treatment, from which it can then be continuously transferred to further treatment. For the acceptance of septic sludge, HUBER has developed special septage receiving stations , which have been successfully used worldwide for decades. With the use of this technology, it is possible for the septic tankers to empty quickly and to remove all coarse material and contaminants reliably and without disturbances. For septic sludge treatment plants our HUBER Screw Presses Q-PRESS® and S-PRESS are also used.[...]

[...]Ingolstadt, Germany Two HUBER belt dryers BT were put into operation on STP Ingolstadt in August 2005. The installed total dryer surface is 160 m² which is the same as that of our new dryer type BT 16. The scope of supply of HUBER SE included not only the drying plants but also the sludge bunkers and thick sludge pumps. The exhaust air treatment system has already been installed. Figure 2 shows the complete plant. The special feature of sewage sludge drying on STP Ingolstadt is that the drying process takes place on a very low temperature level. Warm water with a temperature of 53 °C is available as heat carrier medium. This warm water is heated in the adjacent waste incineration plant via a water-vapour heat exchanger. The exhaust steam from a condensation turbine is available all year round. As this hot water is free for the sewage treatment plant, their operating costs for sewage sludge drying are very low. The dry sewage sludge, which is dried to 90% DS, is thermally utilised in the waste incineration plant, this closes the loop. 294,000 driving kilometres saved per year 88,000 litres of diesel saved per year CO 2 emissions reduced by 225,000 kg per year No use of primary energy Utilisation of secondary energy in the form of cost-free exhaust heat from the waste incineration plant Use of current that has been generated from regenerative sources on the waste incineration plant Most maintenance work (e.g. cleaning the pelletising system) can normally be carried out without having to interrupt plant operation. There are hardly any standstill times, most of the time the dryers operate seven days a week. The sludge drying plants therefore achieve an average annual operation time of significantly more than 8,000 h. The technical plant manager is especially enthusiastic about the low maintenance requirements. The technical data of the sludge drying plant are specified below: Sludge input: 12,000 t/a Number of drying lines: 2 Input DS: 30 % Output DS: 90 % Operating time: > 8,000 h/a Throughput per line: approx. 900 kg/h Maximum water evaporation per line: approx. 600 kg/h Hot water flow temperature: approx. 53°C Heat demand: approx. 7,500 MWh/a from waste incineration plant Current demand: approx. 150 kW[...]