Abstract
The estimate rice productivity in Brazil for the 2008/2009 season, is 12,149.35 thousand tons of grains, being Rio Grande do Sul (RS) state responsible for 61.34% of national production. The rice shell is usually burned for energy production, generating rice shell ash (CCA) as solid residue. CCA represents an average of 4% of the grain mass. In this way, RS state presents an estimated generation of 298.1 thousand tons of CCA in this period. Attempts to reuse this waste are constantly facing difficulties due to inherent CCA properties. This work aims to perform sorption bench tests to verify the possibility of using CCA to treat the effluent of the parboiled process. Tests efficiencies were expressed in terms of organic matter and turbidity removal. The use of a solid residue of the end of the process to treat the effluent of the very process is a strategy to minimize costs for waste management and contribute to the environment in a sustainable way. The sorption efficiency of CCA as an alternative sorbent material reached 78% of organic matter removal and 99% of turbidity removal.
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