“…In particular, PEF is an emerging sludge pre-treatment technology that has been applied to increase the biogas production and volatile solids reduction in anaerobic digesters and to generate sustainable electron donors for denitrification (Lee and Rittmann, 2011;Rittmann et al, 2008b;Alder et al, 2009;Lee et al, 2010). PEF has been shown effective in waste activated sludges, but no previous studies exist on PS treatment alone with PEF.…”