Aging biofilm from a full-scale moving bed biofilm reactor: Characterization and enzymatic treatment study

- A organic-based aging biofilm with the PN/PS ratio of 20.17 was characterized.
- Four commercial proteases and amylases were tested.
- Better performances of proteases on MLSS and PN/MLSS removal and DOC/MLSS raising.
- Distinguishing mechanisms of the treating process were found for the two proteases.