As such, the goal of the current study was to investigate the effects of applying an EF pretreatment on the performance of WAS anaerobic digestion. This was conducted by comparing the performance with a conventional disintegration method as thermo-alkaline (TA) pretreatment. The efficiency of sludge pretreatments on proteins and polysaccharides release, VSS solubilisation, and biogas yield was determined under the batch condition. The modified Gompertz model was used to evaluate the kinetic parameters and predict the biogas yield. Moreover, semi-continuous anaerobic fermentations of pretreated sludge using continuous stirred tank reactors (CSTR) were conducted. The performance of the reactors, biogas yield, and effluent characteristics was measured and compared to raw sludge.