Impact of sludge cation distribution pattern on its filterability in membrane bioreactor

- Impact of cation distribution pattern in AS on the filterability was assessed.
- Charge valence of cation impacted on the stratification structure of PN or PS in AS.
- Multivalent cation enhanced the AS flocculability and filterability.
- The filterability of AS correlated with PN in the supernatant, slime and LB.