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Abstract
In this study, treatment of grease and oil (G&O) and other impurities in waste glycerol from biodiesel production was performed by a two-step process, by acidification and the coaleser process. 1 M hydrochloric acid (HCl) was used to acidify waste glycerol to destabilize the emulsion and remove the suspended solids (SS), soap and methyl ester. For acidification, a pH of 6 was selected, before testing with coalescer. The study was investigated with a wide range of factors and parameters including two media materials (polypropylene (PP) and polyethyleneterephthalate (PET)), two configure shapes (granular and fiber), pH (3–6), bed height (50–150 mm), and flow rate (5–18 dm3/h). The results of the study in the same experiment conditions showed, PP media material gave better results than PET media materials where the fiber sharp material performed better than the granular sharp material. G&O concentration of treated waste glycerol reduced to 0.081 g/L under operating conditions with 120 mm bed height, 5 dm3/h flow rate and PP fiber media.
Acknowledgments
The authors would like to acknowledge the financial support from the Graduate School, Faculty of Engineering, Prince of Songkla University, and the Austria government for support through the ASEA-UNINET Thailand on the place scholarship program, and the Specialized R&D Center for Alternative Energy from Palm Oil and Oil crop, and the Faculty of Engineering, Prince of Songkla University, for providing wastewater samples.