Pyrolytic Conversion of Olive Mill Wastewater Sludge to Biofuels Using Red Mud as Catalyst
International Journal of Energy and Power Engineering
Volume 6, Issue 6, December 2017, Pages: 108-120
Received: Sep. 18, 2017; Accepted: Oct. 28, 2017; Published: Dec. 12, 2017
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Foster Aryi Agblevor, Department of Biological Engineering, Utah State University, Logan, USA
Hamza Abdellaoui, Department of Biological Engineering, Utah State University, Logan, USA
Kamel Halouani, National Engineering School of Sfax, University of Sfax, Sfax, Tunisia
Sedat Hakis Beis, Department of Biological Engineering, Utah State University, Logan, USA
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Olive mill wastewater sludge (OMWS) is an environmental pollutant in olive oil industry. The problem stems from the strong odor and poor biodegradability of OMWS because of its high phenolic compounds. In most Mediterranean countries, olive mill wastewater is stored in evaporation ponds and the residual sludge is landfilled for disposal. To address this environmental pollution problem, fluidized bed catalytic pyrolysis of OMWS was developed to produce pyrolysis liquids that are stable, low viscosity (5-7 cP), neutral pH (6-7), and high higher heating value (41 MJ/kg). The pyrolysis was conducted at 400-500°C in a red mud catalyst bed. The yields of the organic fraction were 29-35 mass%; char/coke yield was 20-29 mass%; and gas yield was 24-37 mass%. The 13C NMR and GC/MS analyses of the liquid products showed predominance of aliphatic hydrocarbons and small fractions of aromatic hydrocarbons and ketones. The composition of these liquid products is in sharp contrast with most lignocellulosic biomass pyrolysis products which are normally rich in aromatic compounds and have very low aliphatic product content. In the absence of the red mud catalyst, the liquid product was viscous and contained acidic compounds.
Catalytic Pyrolysis, Red Mud, Olive Mill Wastewater Sludge, Bubbling Fluidized Bed
To cite this article
Foster Aryi Agblevor, Hamza Abdellaoui, Kamel Halouani, Sedat Hakis Beis, Pyrolytic Conversion of Olive Mill Wastewater Sludge to Biofuels Using Red Mud as Catalyst, International Journal of Energy and Power Engineering. Vol. 6, No. 6, 2017, pp. 108-120. doi: 10.11648/j.ijepe.20170606.14
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