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The aim of this paper is to report on the effects of Hydraulic Retention Time (HRT) and Sludge Retention Time (SRT) on the removal of Chemical Oxygen Demand (COD) from palm oil mill effluent (POME). In this study, an upflow anaerobic reactor was used to evaluate the effects of HRT at 6, 8 10, 12 and 15 days. In order to measure the effects of SRT, the 10, 15 and 20 days aged sludge were used. The differences in COD value of POME and effluent at inlet and outlet of the anaerobic reactor were used to measure the effects of HRT and SRT. The experiments were conducted at 35oC for a length of 60 days, and input-output data of COD were used to achieve the research objectives. The estimated results show that the COD removal was optimum at 12 days of HRT and the estimated COD removal performance was at 40.4 percent. It was also found that COD removal was optimum at 20 days of SRT and the estimated COD removal performance was at 34.1 percent. The study concluded that anaerobic reactor is an effective method to remove COD from POME. This study recommends future researches which aim to increase COD removal to level that is economically and environmentally sustainable.

Effects of Hydraulic Retention Time and Solid Retention Time of POME on COD Removal Efficiency