air sparge vs biosparge

[Fackler]

Does anyone know some good reference sources for comparing Air Sparging and Biosparging? I have been asked to look for documentation or recommendations comparing the different ranges for airflow rates for each method. (i.e. air sparge is typically 4-12 scfm and biosparge is typically 0-4 scfm) I am comfortable with my understanding of the technologies, but I would like to find some better materials to quickly and easily be able to reference if someone else has questions.

Thanks.