METHOD OF ASSUMING MIXED STATE OF NITRIFICATION/ DENITRIFICATION REACTION TANK BY ACTIVATED SLUDGE PROCESS

摘要

PROBLEM TO BE SOLVED: To remove organic materials and nitrogen with high efficiency by performing optimization treatment of parameters by the measured value of tracer concentration, the number of models used for examination and an equation expressing models and comparing parameters obtained every model to determine a model having optimum reversely mixed quantity. ;SOLUTION: In a circulation type activated sludge process, anaerobic tanks 1a, 1b for performing denitrification of feed water, aerobic tanks 2a-2c for performing nitrification and a sedimentation tank 7 for performing solid-liquid separation are included. In a controller to which the measured value of tracer concentration measured by a tracer method, the number of models used for examination and an equation expressing models are inputted during operation, optimization is repeatedly per-formed until the convergence range of parameters becomes a set value or less. Next, when the optimization is finished for all models, parameters obtained every model are compared, and in consideration of a sum of squares of residuals to the measured value and consistency of parameters and models and the like, a model having optimum parameters is determined to assume the mixed state of a reaction tank.;COPYRIGHT: (C)1997,JPO