Instead of pumping unwanted gases and liquids away into space, you could also delete them using mechanized airlocks. This method works without power, but requires a little automation and access to advanced automation technologies.
At the end, I show a method to get rid off all carbon dioxide generated by Petroleum Generators.

Check filtering of unwanted gases here:
   • Oxygen Not Included: How to automate ...  

More on Automation in this playlist:
   • Oxygen Not Included: How to automate ...  

Unfortunately, another duplicant had to die for this experiment. R.I.P. Jean