Comparative approach to the performance of direct and indirect solar drying of sludge from sewage plants, estimation of rates of organic materials (original) (raw)

The objective of this work is to contribute to the enhancement of sludge of wastewater treatment plants in Algeria. A kinetic comparison was made to the direct and indirect solar driers operated with natural convection. The indirect dryer gives temperatures and high efficiency with the direct drier. Drying curves show that the higher the temperature, the higher the short drying time and the drying speed is fast. Solar dryers have reduced the time needed, a water reduction of 71c/o which increases the dryness of the mud from 14.47c/o to 85.53c/o. According to the results obtained, the use of sludge could be very interesting from an agricultural and energy point of view, because it contains more than 58% of MO and can reach 63% in the three summer months (June, July and August). Keywords— Organic matter, Physic-chemical characterization, Renewable energy, Sludge, Solar drying, Thermal treatment. Nomenclature DM: Dry matter (%) DSD: Direct solar drier ISD: Indirect solar dryer OM: Orga...

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