CFD analysis of a three-phase bubble column
 

I want to simulate a CO2-seawater bubble column. In my case there are also micro-organisms present in sea water. I am unable to find how to specify those microorganism in sea water. I am thinking to treat this problem as three phases in which microorganism being treated as solid particles and present in seawater. I am thinking to use Eulerian approach coupled with population balance model. So how can I specify microorganism in sea water.