Is it possible to use the vacuum of space to help with pollution Would it be possible to use a pipeline from the ground and uses the vacuum of space to dispose of things that are hazardous to the environment? (Liquid waste in particular comes to mind) Essentially acting as a syphon that shoots the waste off into the universe?
No.
It is hard to get stuff into space.  If you built a pipe that went to space, it wouldn't suck stuff up for the same reason that the atmosphere doesn't get sucked off the Earth: Gravity pulls things down.  Instead you would have to pump stuff up the pipe, you would need lots of power to do this.  And when it reaches the top it would just fall down, unless you make your pipe 36000km long, so that the rotation of the Earth becomes strong enough to push it away
What you have essentially built is a space elevator. There are huge engineering challenges in making a space elevator.  It is honestly the very hardest way to get rid of pollution.