Effect of solid mixing ratio and temperature on the performance of dry anaerobic composting (Dranco) reactors treating domestic solid wastes(Arabic)

Abstract

In thisresearch, an experimental plant was operated in order to study the effect of solid mixing ratio and temperature on the performance of dry anaerobic composting (Dranco) reactors treating domestic solid wastes.The experimental plants consists of four reactors, which were operated under different temperatures of 35oC, 45oC, 55oC, and 65oC , for the first, second, third and fourth system respectively. Three of these reactors were used to treat food waste at different solid mixing ratios of 40%, 50% and 60% for the first, second and third reactor respectively, while the fourth one was used to treat processing vegetable, fruit and garden waste (VFG) with the solid mixing ratio of 50%. The result of researchrevealed that, both of the removal efficiency of COD and the volume reduction of waste increase with increasing the temperature.Higherremoval and volume reduction were recorded at 65oC. In contrast, there was no significant effect of the solid mixing ratio on the removal efficiency and the volume reduction. The study also shows that the total volume of biogas produced per kg of solids were (2.4, 2.44, 2.7 and 1.26 L/Kg for the first, second, third and fourth reactor respectively. Key words: Solid waste, Dranco, Anaerobic treatment, Biogas, Temperature, Solid ratio