title: Effect of digester F/M ratio on gas production and sludge minimization of ultrasonically treated sludge.
authors.affiliation: Department of Environmental Engineering, Faculty of Engineering, Middle East Technical University, 06531 Ankara, Turkey.
authors.forename: Gözde T
authors.initials: GT
authors.lastname: Köksoy
authors.forename: F Dilek
authors.initials: FD
authors.lastname: Sanin