Abstract
Oil and grease is one of the complicated pollutants to be removed due to oil-in-water emulsions content. This research is a treatment of oily wastewater from an edible oil factory. Addition to pollutant removal, accumulation of PHB (Polyhydroxybutyrate) is investigated simultaneously. Objectives of this research are to obtain the optimum operating conditions for removal of COD and oil, grease, and accumulation of PHB. Operating parameters are acclimatization period (3-7 days), pH (6-8) and sludge concentration (25-75%). Anaerobic treatment was conducted in a bottle and put on a shaker. The wastewater from the edible oil factory was fed to reactors as the substrate and the sludge was added. The result shows that this treatment removed 59.4-90.4% of COD and 65.3-85.2% of oil and grease. Overall PHB accumulation was 0.67-6.00% of PHB/VSS, which is much lower than the pure culture. The influence of pH (6-8) is less significant to both pollutant removal and PHB accumulation. The COD removal efficiency increased with the period of acclimatization and 5 days of acclimatization shows the highest yield of PHB. 50% sludge concentration shows the highest yield of PHB, which is 6.0% PHB/VSS.
Highlights
Oil and grease are one amongst complicated pollutant to remove, due to its characteristics, oil-water emulsions
The overall aim of this study is to examine the performance of the simple anaerobic batch reactor regarding wastewater removal efficiency for refined palm oil effluent treatment
The 3, 5, and 7 days of acclimatization periods have been set as variables in determining the optimum conditions for treatment of oily effluent using simple anaerobic batch reactor
Summary
Oil and grease are one amongst complicated pollutant to remove, due to its characteristics, oil-water emulsions. These emulsified oil droplets are sheltered from spontaneous coalescence into larger flocs, making oil separation by simple gravity a timeconsuming and challenging process. To treat oil and grease rich wastewaters biologically the most important criteria to be met are stable and active biomass and proper sludge concentration. This paper is aimed at achieving the goal by using a simple anaerobic batch reactor to treat the oily containing wastewater through assessing the effects of various sludge concentrations, pH variation, and acclimatization periods on the oily effluent quality. The proposed reactor will reduce the pollutant in the effluents, but the end products of this reaction will produce valuable material [2]
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