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
A wide variety of products and materials are used in water supply, drinking water installation, fire fighting and in the water and waste water industry. For many of these products there are national and international standards, that specify requirements for the functionality and safety of the products. The quality of materials for drinking water are also subject to strict requirements to ensure that human health is not affected or that the odour or taste of the water are not changed.
We offer our customers tests persuant to more than 200 different product standards, for which we are accredited according to DIN EN ISO 17025. Each product test, the detailed testing procedure and set up will be discussed and specified individually with our customers. In addition we develop customized test programmes for products that are not yet standardised or develop pre-standardisation projects with our customers. In these activities, TZW works closely with DVGW CERT GmbH as well as with other international certification companies. Furthermore, TZW is active in national and international standardisation work.
Hygienic and microbiological testing
We offer hygienic suitability 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). In addition, hygiene tests are carried out persuant to other European and international standards. This includes testing the metal release of metallic materials as well as 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, devices for protecting drinking water, and emergency safety showers are also tested according to international standards. Our test range also covers corrugated pipes, pressure-resistant hose lines as well as pipes and pipe connectors. Resistance coefficients (zeta values), which we determine for every component, play a key role in proper planning of a drinking water installation.
Systems and equipment for drinking water treatment
Due to the clear comfort trend of individual post-treatment of drinking water there is an increasing demand for the testing of softener, dosing devices and limescale protection systems. These are tested at TZW according to current European standards. This also includes treatment systems for canteen kitchens. In addition we also offer solutions for individual test programmes for products, processes and methods that have not yet been standardised in order to test them 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 setups that allow us to validate UV devices 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 adjacent to drinking water. This includes, for example, the entire extinguishing water sector. Thus the essential products from the fire brigade are tested. These are e. g. 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