KINETIC ANALYSIS OF ALTERNATIVE CONFIGURATIONS FOR SINGLE-SLUDGE NITRIFICATION/DENITRIFICATION.
A kinetic model based on the structured biomass model of Andrews and coworkers is presented. Results are presented from a series of computer simulations using this model to describe an intermittently aerated, completely mixed single-sludge configuration. These results show the importance of two new variables in describing the behavior of single-sludge systems. One of them is the aeration fraction, which represents the relative activities of the aerobic and anaerobic microbial processes. The other is the cycle time ratio which represents the degree of non-steady-state behavior in the system brought about by sequential aerobic and anaerobic conditions. A simplified kinetic analysis of three alternative configurations confirmed the results of the computer simulation by demonstrating the importance of the aeration fraction and cycle time ratio to process performance. At small values of the cycle time ratio, each configuration approached the behavior of a completely mixed basin in which average kinetic coefficients are used.
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