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Non-Catalytic Slow Pyrolysis of Spirulina Plantesis Residue for Production of Liquid-Biofuel

The concerns in oil reserves depletion and environmental problems demand renewable energy sources, including biofuel, to be continuously developed. The residue from spirulina plantesis extraction is a source of biomass which can be pyrolyzed to obtain liquid fuel. This paper examines the characteristics of pyrolysis with Thermogravimetric Analyzer (TGA) and the slow pyrolysis of spirulina plantesis residue (SPR) with a fixed-bed reactor without catalysts. The result of TGA analysis with a heating range from 30 to 1000°C indicates that 20°C/min is the best heating rate while the minimum temperature for thermal decomposition is 302.06°C. Pyrolysis experiments in a fixed-bed reactor were performed using 50 grams of spirulina plantesis residue as feed, with a pyrolysis temperature between 400-650°C. The maximum bio-oil yield of 25% was produced at a temperature of 550°C, where the aromatic components and phenol increased. The higher heating value (HHV) of bio-oil was quite high (25.70 MJ/kg). On the other hand, the gas products which are dominated by H 2 , CO, and CH 4 , can be used as syngas fuel meanwhile the biochar product which exhibits high C content (50.31%) and ash content (11.80%) can be utilized as an adsorbent and catalyst.