Bacteria produce enzymes. So ...

Bacteria produce enzymes. So you can either add bacteria that will continue to produce the enzyme or you can just add the enzyme which will then have to be replenished as needed.

These links may help you:

https://www.khanacademy.org/science/biology/energy-and-enzymes/introduction-to-enzymes/a/enzymes-and-the-active-site

http://www.lenzyme.com/Grease_Education_Clearing_the_F.html