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Optimization of bubble column performance for nanoparticle collection.

M C Cadavid-Rodriguez¹, A Charvet², D Bemer³

¹Université de Lorraine, Laboratoire Réactions et Génie des Procédés, UMR 7274, Nancy F-54000, France; CNRS, Laboratoire Réactions et Génie des Procédés, UMR 7274, Nancy F-54000, France; Institut National de Recherche et Sécurité (INRS), Vandœuvre-lès-Nancy F-54519, France.

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|March 4, 2014

Summary

Bubble columns offer a constant pressure drop alternative to fibrous filters for ultrafine particle collection. Optimal performance requires large liquid height and small bubble orifices, with granular beds enhancing efficiency.

Keywords:

Bubble column Collection efficiency Nanoparticles Submerged granular bed

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Area of Science:

Environmental Engineering
Fluid Dynamics
Particle Technology

Background:

Fibrous filters are effective for ultrafine particle separation but suffer from clogging and pressure drop issues.
Clogging necessitates frequent maintenance, increasing operational costs and downtime.
Alternative filtration methods with constant pressure drop are needed.

Purpose of the Study:

To investigate bubble columns as an alternative to fibrous filters for ultrafine particle collection.
To evaluate the impact of operating conditions on bubble column collection efficiency.
To compare the performance of bubble columns with traditional fibrous filters.

Main Methods:

Experimental investigation of bubble columns under varying liquid heights, air flow rates, and bubble sizes.
Assessment of the effect of granular beds on particle collection.
Comparison of collection efficiencies with established fibrous filter data.

Main Results:

Bubble columns demonstrate high collection efficiency with large liquid height and small bubble orifices.
Collection efficiencies of bubble columns were found to be lower than those of fibrous filters.
Gas velocity had a minimal impact on collection efficiency.
Incorporating a granular bed increased bubble residence time and enhanced collection efficiency.

Conclusions:

Bubble columns are a viable alternative to fibrous filters, particularly when constant pressure drop is critical.
Optimizing liquid height and bubble size is key to maximizing bubble column efficiency.
Granular beds significantly improve bubble column performance for particle collection.