Using waste activated sludge of 4 different solid concentration levels and their batch experiments which were carried out at 20℃ and pH 7.5, the kinetics of solid degradation and behaviors of nutrients during aerobic digestion were estimated. The solid degradation coefficients and the rate coefficients of k_(dN), k_(dP), μ_N, μ_D, tend to increase linearly according to decrease of the initial solid concentration. However, the other rate coefficients related to mineralization of nutrients seemed not to be dependent upon initial solid concentration. From those results, we could explain the reason why the design of continuous inflow pattern aerobic digestion reactor is over-estimated if based upon kinetics estimated from batch experiments, and consider the ways how to apply kinetics based upon batch experiments on the design of continuous inflow aerobic digestion reactor. |
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