From transient to persistent foaming: Interfacial characteristics of sludge-derived proteins and humic substances under organic overloading in anaerobic digestion.
The transition from transient to persistent foaming under organic overloading in waste activated sludge anaerobic digestion (AD) remains insufficiently understood. This study investigated foam evolution under increasing organic loading rates (OLRs) in a semi-continuous mesophilic digester treating thermal-alkaline-pret...