Water analysis Conducting and evaluating physical-chemical and microbiological water testing in accordance with the German Drinking Water Ordinance and other relevant legal regulations.
Testing of products and devices Initial testing of products and materials in contact with drinking water. Our Test Centre is accredited for more than 200 different product standards according to DIN EN ISO 17025. Test and develop UV technology.
Treatment technologies Develop sustainable water supply concepts. Implement, monitor and optimise new technologies. Test and further develop existing treatment methods.
Micropollutants and microorganisms Develop and improve the method of determination using cutting-edge equipment. Investigate the presence, behaviour and retention of inorganic and organic micropollutants in the water cycle and drinking water treatment.
Networks and drinking water distribution Microbiological quality change, deposit formation and cleaning and optimisation of the distribution network operation. Evaluate and analyse corrosion damage.
Risk management Support for water supply companies to establish a Water Safety Plan. Benefit from our extensive expertise.
Contaminated sites Evaluation of the decomposition potential at contaminated locations. Development of sustainable ways to eliminate pollutants from the environment. Employ a combination of microbiological and technical methods.
- About TZW
The most diverse products and materials are used in water supply, drinking water installations, fire fighting systems and in the industrial water and waste water sector. Many of these products are the subject of national and international standards, which define functionality and safety requirements. There are also strict regulations on the quality of materials for drinking water so to ensure that human health is not affected or that the odour or taste of the water are not changed.
We offer our customers testing in accordance with more than 200 different product standards, for which we are accredited according to DIN EN ISO 17025. For each product we test, the detailed testing procedure and set up will be individually discussed and specified with our customers. For products that are not yet standardised, we develop tailored testing programmes or collaborate with our customers to develop pre-standardisation projects. In these activities, TZW works closely with DVGW CERT GmbH as well as other international certification companies, and is active in national and international standardisation work.
Hygienic and microbiological testing
We offer hygienic compliance tests of products and materials in contact with drinking water in accordance with the assessment principles and guidelines of the German Federal Environment Agency (KTW, W 270). Hygiene testing is also conducted according to other European and international standards. This includes testing the metal discharge of metallic materials and testing cement-bound materials, lubricants, thread-cutting compounds, solders, fluxes and cleaning agents.
Pipes and fittings in water distribution and drinking water installations
In addition to a wide variety of product groups such as shut-off valves, tapping bridges, hydrants, check valves, membrane expansion vessels, water meters and sanitary fittings, drinking water heaters, drinking water protection devices, and emergency safety showers are also tested according to international standards. Our range of tests also covers corrugated pipelines, pressure-resistant hoses, and pipes and pipe connectors. Resistance coefficients (zeta values), which we determined for every component, play a key role when properly planning a drinking water installation.
Systems and equipment for drinking water treatment
The noticeable trend towards and convenience of individual post-treatment of drinking water means that there is greater demand for the testing of softening systems, chemical dosing systems and limescale protection systems. These are tested at TZW according to current European standards. The same applies to treatment systems for industrial kitchens. We also offer solutions for individual testing programmes for products and methods that are not yet standardised in order to test these for technical and hygienic safety.
Heiko Delong Tel. +49 721 93163-20, Send e-mail
UV disinfection devices, UV sensors and UV lamps
In current practice, only mercury-vapour lamps are used to disinfect water. A distinction is made between UV low-pressure lamps and UV medium-pressure vapour lamps. We have test set-ups that allow us to test UV instruments with a throughput of up to 3,500 m3/h using various test organisms. In addition, our optoelectronic equipment enables us to conduct ageing tests on UV lamps, their characterisation and the qualification of UV sensors. In future, UV LED technology will also be further developed for use in water disinfection, which is why we are already offering specific testing programmes and approaches.
Fire-fighting equipment and fire-fighting facilities
Our testing services also encompass products from fields of work related to drinking water, such as the full range of products that use water for fire-fighting. Consequently we also test critical fire-fighting products. These include steel pipes, couplings, suction connections, adapters and manifolds. Extinguishing water connection systems as well as filling and drainage stations or direct connection points are also tested.
Bruno Vogel Tel. +49 721 93163-12, Send e-mail
Equipment and methods
- Federal Environment Agency assessment guidelines (KTW and metals)
- Biofilm according to W 270 or DIN EN 16421
- Protection from contamination and back-suction
- Pressure loss test bench
- Pressure change test bench
- Temperature change test bench
- Endurance test benches for sanitary tapware and other valves
- Test benches for the effectiveness of softeners and limescale protection equipment
- UV collimated beam devices
- Test benches for UV lamps and sensors (optical bench, test reactors)
- Test facility for biodosimetric testing of UV devices
Ultrafiltration as an element of energy efficiency in drinking water hygiene (Ultra-F)
The aim of the project is to holistically and systematically investigate drinking water installations in the lab, in technical centres and in field…Read more
Black biofilms on drinking water taps – presence, relevance and need for research
The objective of the DVGW-funded study on the occurrence of black biofilms on drinking water taps was to assess the presence and relevance of black…Read more
Disinfection of drinking water installations with a special focus on warm water applications
The aim of the DVGW-funded research project was to demonstrate the possibilities and limits of disinfecting drinking water in drinking water…Read more