Acetaldehyde Aroma in Lt Lagers

I just kegged a Dortmunder this morning and noticed a slight apply aroma in the beer.  None in the taste, however.  This beer was kept at 55F for 18 days and was oxygenated with filter air.  Any chance that lagering will remove the aroma?

Based on my experience, yes, it should.

Yea man, just let it sit on the yeast and let them do their job…Acetaldehyde is easy to clean up…just a sign of young beer.