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Investigation of Transport of Nanoparticles through Ion Exchange Resin Beds by Magnetic Resonance Imaging and Acoustic Particle Counter

Investigation of Transport of Nanoparticles through Ion Exchange Resin Beds by Magnetic Resonance Imaging and Acoustic Particle Counter
Typ:Master thesis
Datum:immediately, by appointment
Betreuer:

Prof. Gisela Guthausen
Prof. Harald Horn
Dr. Maria Pia Herrling, Ovivo Switzerland AG

Project description (pdf)

 

Motivation:

Nanoparticles are ubiquitous in waterbodies, such as surface waters, drinking water, and can cause
negative health and eco-toxicological effects. A nanoparticle typically has a size of 1 – 100 nm. Due
to their small size, they are difficult to remove from water by conventional water treatment technologies.
In order to deionize water in water treatment, ion exchange resins in e.g. mixed bed filters, are widely
used and their ability to reject nanoparticles is poorly studied, mainly due to analytical limitation for
nanoparticle monitoring.
Ion exchange is also of high relevance for industrial water purification, as for example in ultrapure water
production for electronics industry. Ultrapure water (UPW) is purified water with most of the quality
parameters below the detection limit of the most advanced analytic technologies. Nanoparticles should
be removed from the UPW down to < 1000 particles/L at 10 nm size at the point of entry for wafer
fabrication. In the UPW sector, but also in other water fields, there is an urgent need for strategies to
detect and control nanoparticle release.


Tasks:

  • Conducts a state-of-the-art literature research on nanoparticle occurrence and rejection by ion
    exchange resins and analysis with MRI
  • Trace different magnetic nanoparticles in ion exchange resins columns using MRI in order to
    identify mechanisms for transport and rejection
    - Image ion exchange resins bed for contrast optimization
    - Calibrate paramagnetic relaxation enhancement in MRI (relativities etc.)
    - Detect nanoparticle rejection patterns within the resin beds (cationic and anionic)
    - Improve data analysis tools (numerical image analysis)
  • Conduct breakthrough experiments to elucidate the rejection and washout of different
    nanoparticles by online particle concentration monitoring using APC
    - study the impact of particle size;
    - study the impact of cationic and anionic ion exchange resins;
    - study the impact of flow on particle behaviour in resin bed.
  • Assessment of the results and evaluation of technical improvements for nanoparticle rejection in
    water treatment