Sensor measures heavy metals in water quickly and precisely

2011-08-11 10:28 by Holland Environment Group

International collaboration thanks to European Subsidy


Supported by a European Subsidy HWT initiated, in collaboration with Eijkelkamp Agrisearch Equipment, Selor and Geoconnect the Silco project in 2009. Next to these Dutch companies universities in Cologne (Germany) and Florence (Italy) and small businesses in Greece and Slowakia were development partners.

The sensor was developed to accurately measure the minute quantities of copper and silver ions that are added to water by the BIFIPRO® (the equipment of HWT which combats legionella in drinking water and cooling towers). Using the sensor the quantities dosed are immediately known. Prior to the development of the sensor watersamples needed to be taken and analysed, which takes a number of days and is considerably more expensive.

After exhaustive testing in the laboratory of Holland Watertechnology the first BIFIPRO®-system equipped with Silco-sensors was installed in a natural source Spa in Slowakia in july . Because the addition of copper and silver-ions keeps the baths free of bacteria the use of chlorine is avoided, giving the bathers a much more original experience.

The quantities of copper and silver are measured by the sensor, and followed remotely in the Netherlands. Based on these values the dosage can be adjusted remotely, or eventually by the BIFIPRO® system itself.

The Silco sensor is also intended for use with the BIFIPRO®COOL which eliminates legionella in cooling towers. With accurate quantities of copper and silver the addition of expensive chemicals which are harmful to the environment is no longer necessary. Because cooling towers are frequently difficult to access the on-line measurements provided by the sensor are a sensible solution.

More applications

Director Leo de Zeeuw of HWT sees more applications for the sensor technology. “By adding the sensor into a  ‘hand held’-device customers could eventually measure copper and silver quantities in their water system at different points”, he explains. “Using this they can detect dead-ends or sections with insufficient water flow in their plumbing system. This knowledge greatly helps in combatting legionella in complex water systems.” 

De Zeeuw calls the development of the Silco-systeem ‘a great example of European collaboration’. “Without the subsidy from Brussels the project would not have been started”, he says. “The universities in Germany and Italy and the companies in the Netherlands, Greece and Slowakia worked in harmony with a great product as a result.” According to De Zeeuw this project will lead to further sensors which are capable of measuring different substances. The companies are already collaborating on sensors to measure nitrates and nitrogen in a similar fashion.

For more information: Holland Watertechnology, Leo de Zeeuw, telephone +31-343 475 090 or +31-6-2000 7190

Leo de Zeeuw in het FD

2010-03-25 13:53 by Holland Environment Group

Leo de Zeeuw in de entrepreneur sectie van het FD

Het Financieele Dagblad van 25 maart 2010 schrijft over Holland Environment Group en Ctgb goedkeuring voor het legionellabestrijdingsmiddel BIFIPRO®.

Harde aanpak legionella

2009-10-11 14:27 by Holland Environment Group

De minister informeerde de Tweede Kamer onlangs over de naleving van de legionellavoorschriften. Hieruit bleek onder andere dat eigenaren van prioritaire instellingen zoals ziekenhuizen, sauna’s en zwembaden de voorschriften slecht naleven.

Minister Cramer is bezorgd over deze situatie en heeft een lik-op-stuk-beleid aangekondigd ingaand per 1 januari 2010. Bij de nieuwe aanpak stelt de VROM-Inspectie een proces-verbaal op zodra blijkt dat een instelling geen risicoanalyse of beheersplan heeft of geen beheersmaatregelen uitvoert zoals het nemen van monsters.

Medio 2010 treedt de nieuwe Drinkwaterwet in werking. De Drinkwaterwet wordt dan ook opgenomen in de Wet Economische Delicten. Dit effent de weg voor nog hogere boetes bij niet-naleving van de legionellavoorschriften.

Zie VROM voor meer informatie.

Chinese Addition to HEG team

2009-07-14 13:33 by Holland Environment Group

HEG has strengthened its team with Xia Xia Zhang from China. She studied at Wageningen University for the last 5 years and joins us as project manager.

Xia Xia Zhang shall perform reseach in the areas of Copper/Silver ionisation and sludge sedimentation. Additionally, Zhang shall maintain and intensify our contacts in the Chinese market. There is a lot of interest from Chinese companies and organisations for the soil remediation technologies and water treatment systems developed by the Holland Environment Group.

Licence agreement Japan

2009-05-20 13:22 by Holland Environment Group


Holland Environment Group has signed a 10 year licence agreement with Japanese corporation Shimadzu, after a successful collaboration which started 5 years ago.

Shimadzu is a prestigious Japanese company, originally involved in the production of advanced measurement and control instruments (as well as x-ray devices) which it sells worldwide.

In 2003 Shimadzu started activities in soil remediation, licensing Holland Environment's technologies for the Japanese market. The patented techniques were developed in the Netherlands and have a history of many years of successful application around the world (including Japan) in cleaning up polluted soil.

Italian licence awarded

2009-03-30 13:30 by Holland Environment Group

Saipem logo

After successful deals in Japan, Holland Environment Group signed a licence agreement with the Italian Saipem group, part of the ENI-concern. In a pilot project only the Electroremediation techniques proved to be capable of removing mercury pollution from the soil in-situ (without digging up the polluted ground).

A number of Saipem's clients have metal-based mercury pollution in their soil. The groundwater, and as a result the drinking water supply is threatened by this pollution. Next to Holland Environment, a German and an American company were invited to demonstrate their abilities of mercury removal, but only Holland Environment proved successful.

The technique employed is developed in the Netherlands and has been applied successfully here and in Japan on a large scale. With this licence agreement with Saipem these techniques are now available in Italy also.