Fermented Cassava-rhizome Residue as a Biomass Pellet Binding Additive Influenced by Multi-bacterial Biofilm

Weeranut Intagun, Nitipong Soponpongpipat, Wirojne Kanoksilapatham

Abstract


The use of fossil fuels can be reduced by using biomass fuels. As one of the world's largest producers of cassava, starch-rich cassava-rhizome waste is readily available for direct and indirect energy sources. Using a simple fermentation method, the binding properties of fermented cassava-rhizome were considerably enhanced. The investigation was conducted by comparing the bulk density, durability index, production yield, and higher heating value of pellet made from Leucaena-wood residue, Leucaena-wood residue mixed with fermented and non-fermented cassava rhizome. The biofilm produced by the growing microorganisms on the fermentation particles played an important role in improving the binder's quality. The biofilm provided stronger adhesive force than starch contained in non-fermented cassava rhizome. It was demonstrated by the increase in bulk density and durability when fermented cassava rhizome was mixed into pellets. In the early stages of incubation, the conversion of starch to the microbial biofilm did not significantly affect the higher heating value of the cassava rhizome. However, prolonged fermentation caused a decrease in the higher heating value. Day 3 of incubation was the optimal fermentation time. After day 3, rotting biomass fibers increased, which decreased the durability of pellets made from the additives.

Keywords


Cassava rhizome; Biofilm; Biofuels biomass pellets; Fermented cassava rhizome; Leucaena wood

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References


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