Degassing of water to remove CO2

The water at lower temperature dissolves gases and liberates at warmer temperature. The more surface are is provided more gases are dissolved. By degassing tower, blowing air from bottom and dropping water from top, are we not increasing possibility of dissolving more gases?

Yes it will dissolve more gases in water.

But there are systems with degassers by Paul Mueller

Also I obssrved in the chapter of activated carbon, topic says activated carbon is made “burning coconut shell in presence of oxygen” actually it should be in absence, otherwise you will get only ash.

Yes, that was a typographical mistake and has been corrected.
Thanks for your cooperation.