Currently the removal of CO2 is too low and it has been proposed to change the deep well aeration with a co-current tower aerator.

Question

select the advantages of using deep well aeration from the below:
Very high O₂ transfer within an exceptionally small space Very good removal of gases Low energy consumption Not very sensitive to variations in hydraulic load

select the advantages of using the tower aeration from the below:
Very high O₂ transfer within an exceptionally small space Very good removal of gases Low energy consumption Not very sensitive to variations in hydraulic load