Water dynamics on Bisphenol-covered silica and clay as models for water purification filters

Important results from the project

The project idea was developed in close collaboration between SWR and ESS to create a connection between industrially applied water research and neutron scattering at ESS. Experience at other neutron sources has shown that collaborations between industrial partners and large-scale neutron facilities take lead-time before the experiments are becoming familiar enough that the industrial partner treats them as a standard tool. The most valuable knowledge transfer between SWR and ESS is the applied approach to research on one side and the knowledge of when to use neutrons on the other.

Expected long term effects

The project shows through neutron scattering at the ORNL Spallation Neutron Source that the clay in sand filters, used in water treatment plants, behaves differently if exposed to the micropollutant Bisphenol A (BPA). These results could not be achieved in a conventional laboratory. Further investigations are needed to understand how the change affects the filter. The new findings are expected to rise the awareness at water utilities that cutting edge neutron scattering facilities like ESS are relevant also to traditional public service providers.

Approach and implementation

As the ESS neutron scattering facility is not yet operational, the project applied for beam time at the ORNL in the United States. The highly contested beam time was not only approved twice but also given for unusual long periods (4 days). The reason was the applied approach of the tests, using the facility for unusually down to earth challenges, which was also highlighted locally in the research community around the facility.