University of Porto

Treatment of Sugar Carbonatation Sludge for Reuse and Flue Gas Desulphurisation

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In this work sugar refinery carbonatation sludge is treated in a pilot scale facility for two purposes: reuse in the carbonatation process, mixed with fresh calcium hydroxide, and flue gas desulphurisation. The sludge is first dried, and then calcinated in a batch kiln with a capacity of 100 kg, designed for the purpose. This process is potentially attractive for the sugar industry, since it can save both process water and calcium oxide, simultaneously reducing the amount of wastewater. This paper presents the results of laboratory and industrial tests on the utilization of treated lime in the carbonation and desulphurization processes.

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