Peracetic acid continuously decay and hydrogen peroxide can be decomposed under illumination of uv light. You can wait and eliminate those two species then further purified your acetic acid by distill it into another container. 

Here are some simple ref : 

http://newfrontchem.iqstorm.ro/upload/10-NFC-23-2_Cataldo.pdf

http://envirotech.com/pdf/Perasan%20Decay.pdf

A slower but better way was performing fractional distillation, you can isolate your acetic acid from other mixtures as they have different boiling point unless you having azeotropic mixture.

Hope this help.  

Depending on the materials available and also tech available, you can go for reactive distillation. It will be more complex to design but if done successfully you might be able to separate components at a fraction of a cost then many other systems.

im still searchin for a simple method to get pure peracetic acid, but i use molecular seize 3A to reduce water and shift the reaction toward the formation of peracetic acid, also using highly purified hydrogen peroxide will help to get peracetic acid up to 40%, that's what i get, if this will help you.