Abstract
Abstract Basic equations based upon the Monod kinetic model are presented for a two-stage, sequential anaerobic-aerobic treatment system. The effects of operating conditions, such as hydraulic retention time, mean cell age, concentration of microorganisms and initial substrate concentration, on the behaviour of the two-stage system for the treatment of a CTMP effluent were studied theoretically. This was done in terms of removal of BOD5 and RFA, and sensitivity to changes in operating conditions. The study revealed that unstable operation of the anaerobic process could be due to the treatment being carried out in a time range in which the operation was very sensitive to the variation in either hydraulic retention time or mean cell age.
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