Effect of Negative Aeration Rates on Water Balance in Biodrying of Wet-Refuse-Derived Fuel
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Abstract
Biodrying as a part of mechanic biological treatment (MBT) is a wide application method to reduce the excess moisture content in the substance and to improve the combustible materials as refuse-derived fuel (RDF) production process. The moisture content is reduced by evaporation and leachate generation during the biodrying process. To minimize the leachate generation due to it being more harmful to the environment, the optimization of the aeration rate should be assessed. Therefore, this study investigated the water balance under the variation of continuous negative aeration. The experiment set aeration rates of 0.4, 0.5, and 0.6 m3/kg/day. The operation time of each experiment was set to five days. This study was performed with a lysimeter scale using wet-RDF as a feedstock. The initial weight of wet RDF was 70.0 kg. At the end of the operation, the comparison of moisture content change in the feedstock and biodried products from evaporation and leachate generation was analyzed. The study illustrated that the highest moisture content reduction by evaporation was obtained from 0.4 m3/kg/day, followed by 0.5 m3/kg/day and 0.6 m3/kg/day, respectively. The highest water reduction by leachate generation was obtained at 0.6 m3/kg/day, followed by 0.4 m3/kg/day and 0.5 m3/kg/day, respectively. The final moisture content in the biodried product was 20.27 kg, 23.03 kg, and 23.47 kg from the negative aeration rates of 0.4, 0.5, and 0.6 m3/kg/day, respectively. Also, the moisture reduction of each experiment was 35%, 27%, and 26% that corresponding to weight reduction at 18%, 17%, and 15% of 0.4, 0.5, and 0.6 m3/kg/day, respectively.
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References
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