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[...]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 treatmen t 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 bar spacing, and remove the material prior to discharging it. 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 modernisation of existing plants. The systems are customised to the individual needs and the required water quality of each project. Customers benefit from our decades of expertise for particularly stable and reliable fully automated machines with the best hydraulic properties for maximum separation rates. Depending on the application and installation situation, 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 to medium-sized pollutants of more than 10 millimetres, 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 1-10 millimetres, self-cleaning 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 for all flow rates. Depending on the flow direction, a distinction is made between HUBER Band Screen CenterMax® : Screen of the "centre-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 micromillimetres, 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 aim 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).[...]

[...]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.[...]

[...]HUBER Technology Customer Service and Maintenance in Great Britain and Ireland HUBER Technology Aftersales operate out of four strategically located operational depots in Chippenham, Rotherham, Dundee and Portadown. Our Aftersales Division delivers a comprehensive portfolio of aftersales services to clients across Great Britain and Ireland. If you’re looking to work with a trusted partner who will provide you with an outstanding level of service, some of the best equipment and solutions on the market fully supported by peace-of-mind warranties - you should be talking to us. With mechanical and commissioning engineering capability headed up by Regional Field Managers at each office, our highly skilled Mechanical Service Technician teams have extensive experience and in-depth understanding of both HUBER Technology products and the industries that use them. Rapid response – planned or reactive works Whether it’s planned or reactive works, we’re focussed on providing a flexible, highly responsive and rapid service with national coverage to all our clients whenever and wherever they need us. Coupled with the support of an extensive stock holding of OEM spare parts, HUBER Technology can deliver robust, cost effective solutions and equipment to meet a wide range of budgets and operational requirements. We also have the ability to complete the majority of repairs on site, meaning reduced operational downtime reducing the need to bring in hire equipment while your own is offsite. The added advantage of onsite repair is the ability of our team to identify related problems which may have caused or contributed to the failure in the first place. And we won’t just repair a machine that fails repeatedly – our right first time fix once approach via our expert fault analysis will pinpoint the problem and really save you money. Brochure: HUBER Technology UK Customer Service, Maintenance and Hire Asset availability - delivering the OEM difference Our reputation is built on a strong and proven track record – and it depends on our ability to deliver asset availability working at optimum efficiency for our customers. As an Original Equipment Manufacturer (OEM) we have the benefit of exclusive access to the original technical specifications, drawings and service manuals for all HUBER equipment. Coupled with our unrivalled knowledge of HUBER’s technologies, this provides us with a key advantage, enabling us to deliver comprehensive aftersales support and cost-effective solutions that really work for our clients. Choosing to work with us as an OEM will help you maximise your existing asset base – the longevity of HUBER equipment which means robustness is built in right at the very start will help you to do precisely that. And we’ll never offer you a quick fix solution which simply says lets strip a piece of equipment out, throw it away and just replace it with a new one. We’re dedicated to developing an in-depth understanding of the needs, requirements and asset base of each individual customer. For us, building an ongoing relationship is key to helping them maximise their operational performance. HUBER is already helping customers in the water sector with: enhancing operational efficiency upgrading and enhancing their existing asset base strengthening their operational and asset resilience stretching their assets by extending and optimising the operational lifespan of their equipment developing smarter supply chain equipment solutions reducing their TOTEX costs providing 24/7 peace of mind that their HUBER equipment base is being maintained at the optimum level minimising emergency breakdowns and reducing operational downtime ensuring they avoid repeated equipment failures which are costing significant amounts of money in repairs and temporary replacement hire costs Repair - Spares - Refurbishment - Contracts - Hire - Regional Depots Repair: Reactive Repair/Breakdown On site repair via mobile fully equipped workshop vehicles OEM trained front-line Mechanical and Electrical Technicians Regionally based dedicated point of contact Fixed price quotations Detailed inspection and completion reports Click here to enquire OEM Spares Extensive stock of strategic OEM spares 3 rd party component stocks of critical and non-critical spares Tailored stock holding options in line with installed asset base Nationwide next day delivery Click here to enquire Refurbishment / Exchange Extensive offsite refurbishment and testing at Regional Service depots OEM specification and trained technicians High quality supported by OEM warranty Fully refurbished exchange equipment options to maintain operation Removal, installation and re commission services Click here to enquire Service Contracts/PPM Tailored solutions integrated into customer’s organisation Costs inclusive of all routine parts and labour Guaranteed asset availability Asset optimisation Click here to enquire Hire Equipment Range of hire units to meet customer requirements Tailored solutions installed and commissioned by OEM trained technicians Supported by HUBER service Extensive stock of parts to back up the hire fleet > More details on HUBER UK's hire equipment Regional Service Depots and Field Managers Our Regional Field Managers can draw on a wide range of resources and in-house expertise, engineering specialists and technical knowledge built up over decades and a 40-strong team of experienced industry professionals including: Electrical Design Engineers Mechanical Design Engineers Product Development Engineers (UK & Germany) ICA Engineer Process Development Engineer You will find the detailed regional HUBER Service staff at “ Contacts ”[...]

[...]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 on-site 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 and contaminants such as sanitary products and plastic particles etc. 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 then possible for the septic tankers to empty quickly and for the removal of all coarse material and contaminants to take place 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[...]

[...]Products and solutions for the safe operation of sewer systems and the protection of our environment Only with a functioning sewer network can secure wastewater disposal be ensured that meets both water protection and flood protection requirements. Combined sewers carry the wastewater together with the rainwater that accumulates on paved surfaces (roofs, roads, etc.). In a separate sewer system, wastewater and stormwater are collected separately. The disadvantage of separate sewer systems is higher investment costs, the advantage is that less wastewater has to be treated in the sewage treatment plant, as the rainwater can be infiltrated or discharged into a body of water. HUBER has various products and solutions to meet the challenges associated with the operation and maintenance of a sewer system. HUBER offers a range of products and solutions for the sewer system Screens for pumping stations : Trouble-free operation of pumping stations in the sewerage system can be achieved if pumping stations are equipped with appropriate screening systems to ensure that coarse material is safely removed. Combined wastewater screening : Before stormwater and combined sewage are discharged into a watercourse, screening plants are used to separate larger solids from the wastewater. Road run-off treatment plant (SABA) : Special plants for the treatment of precipitation water that is to be drained and treated from roads and other traffic-related surfaces. Protection against flooding and backwater : Heavy rainfall events are increasingly causing flooding. Structures should therefore be equipped with suitable products that provide protection against flooding and backwater. Access solutions for manholes and tanks : Stainless steel components such as manhole covers, ladders, step irons, railings, access aids and prefabricated manholes. Heating and cooling with sewer water : Wastewater in sewers usually has a temperature between 12° and 20° C, and even in winter the temperature hardly ever drops below 10° C. The HUBER ThermWin process ensures that wastewater from sewers can be used as a renewable energy source for heating and cooling buildings. Treatment of mineral waste : In the sewer system, deposits accumulate time and again, which have to be removed regularly during sewer cleaning. These deposits are an inhomogeneous mixture of mineral solids contaminated with organic material. HUBER offers solutions for the treatment of mineral waste and thus enables more cost-effective disposal.[...]

[...]Combined Sewerage and Stormwater Treatment Protection of water bodies from polluted rainwater The advanced treatment of combined and stormwater in wastewater transportation systems is a main issue with regard to sustainable environmental and water protection. The building of new wastewater treatment plants and the upgrading or refurbishing continuous wastewater discharges has significantly increased the quality of many watercourses. Nevertheless, despite all efforts, ecological deficits still exist. Some of the problems are caused in the discharges of combined and separated sewers during storm events when floating and coarse material from the sewers passes into the water bodies. The advanced treatment of combined and stormwater in wastewater transportation systems is a main issue with regard to sustainable environmental and water protection. The building of new wastewater treatment plants and the upgrading or refurbishing continuous wastewater discharges has significantly increased the quality of many watercourses. Nevertheless, despite all efforts, ecological deficits still exist. Some of the problems are caused in the discharges of combined and separated sewers during storm events when floating and coarse material from the sewers passes into the water bodies. Screening in Pumping Stations HUBER screens and screening systems protect pumps in pumping stations from clogging and blockage and increase their operational safety Combined Wastewater Screening HUBER offers proven screening systems for the safe retention of solids in stormwater overflows, stormwater overflow basins and sewers that discharge wastewater into a body of water. Technical Road Runoff Treatment In the HUBER road wastewater treatment plant, a space-saving HUBER Disc Filter RoDisc® is used instead of a soil filter. Flood and Backwater Protection We offer flood-proof HUBER Manhole Covers as well as flood-proof technical doors for protection against flooding and backwater. Diverse solutions for the sewer system and stormwater management HUBER offers various machines and products for sewer systems and stormwater drainage as well as for the different structures for the treatment of combined sewage and stormwater. Screens for pumping stations : Trouble-free operation of pumping stations in the sewerage system can be achieved if pumping stations are equipped with appropriate screening systems to ensure that coarse material is safely removed. Combined wastewater screening : Before stormwater and combined sewage are discharged into a watercourse, screening plants are used to separate larger solids from the wastewater. Road run-off treatment : Special plants for the treatment of precipitation water that is to be drained and treated from roads and other traffic-related surfaces. Protection against flooding and backwater : Heavy rainfall events are increasingly causing flooding. Structures should therefore be equipped with suitable products that provide protection against flooding and backwater. Equipment for manholes : Stainless steel components such as manhole covers, ladders, step irons, railings, access aids and prefabricated manholes. FAQs Frequently Asked Questions What is DWA-A 102? The DWA-A 102-1/BWK-A 3-1 Standard is entitled "Principles for the management and treatment of stormwater runoff for discharge into surface waters" and was published in December 2020 by the German Association for Water, Wastewater and Waste (DWA). DWA-A 102 replaces A 128. The content of A 102 is water protection with regard to precipitation-related urban runoff. Planning principles and recommendations for action are given for both separate sewer systems and combined systems with the aim of minimising undesirable substance input into water bodies and the soil. What is a separate sewer system? In a separate sewerage system, stormwater is collected separately from domestic and/or industrial wastewater and discharged into a nearby receiving water body or infiltrated. Whereas in the combined sewer system the stormwater is routed to the sewage treatment plant together with the wastewater, the separate sewer system has the advantage that the sewage treatment plant does not have to deal with the hydraulic load of the stormwater and the wastewater sewer can be dimensioned smaller. However, with a separate system, all pipes are needed in duplicate. Yet, rainwater can also be heavily polluted in some cases. Depending on the degree of pollution, this may also lead to pollution of water bodies, so that so that the rainwater should also be treated appropriately. In Germany, the trend is increasingly towards separate systems.[...]