POME has a high chemical oxygen demand (COD) content of 33,600 mg/L. The presence of POME in the environment is a potential pollutant due to the high COD content which makes POME difficult to decompose. The appropriate processing method to reduce the COD content in POME is anaerobic processing using an upflow anaerobic sludge blanket (UASB) reactor with the concept of Two-Stage UASB for hig…