The amount of liquid waste from the tapioca flour industry in Indonesia is quite high. Because of its high organic content, the waste is suitable for use as a biogas feedstock. The purpose of this research was to examine the impact of feed pH on the biogas generation from tapioca liquid waste via anaerobic digestion (AD) combined with microbial electrolysis cell (MEC-AD). The results revealed that the MEC-AD increased biogas yield up to 1.85 times compared to the AD alone. Then, in MEC-AD, the optimum feed pH was 7. At a feed pH of 7, biogas yields generated from AD and MEC-AD processes were 190.30 mL/g-CODadded and 340.58 mL/g-CODadded, respectively. Furthermore, MEC-AD removed a higher chemical oxygen demand (COD) content (43 %) compared to AD alone (37 %). Consequently, it can be concluded that the optimum conditions were the MEC-AD at a feed pH of 7. The existence of MEC in AD enhanced the values of maximum biogas yield (A), biogas generation rate (µ), and adaptation time (λ). The MEC-AD at feed pH 7 had ym, µ, and λ of 340.58 mL/g-CODadded, 170.00 mL/g-CODadded/day, and 0.00 days, respectively.