Various models, applied to the design of aeration tanks, trickling filters and rotating discs, are compared. The adequacy of the models is established from the minimal mean square deviation of the measured and calculated values of the effluent concentration of a pollutant.



It is shown that at the oxidation of simple substrates of the glucose type Moser's model is an adequate model and Monod's model is a particular case of this model. If a single substrate has a large concentration, activated sludge or biofilm become “saturated” and the oxidation kinetics follows the zero order.



As the processing of the results of some experiments showed, the classical Monod model and its extreme case—the first-order equation of a reaction—are not adequate to the processes of the oxidation of multicomponent municipal sewage water. Equations for reactions of higher orders are true for them. The rate constant of the first-order reaction correlates well with the effluent concentration-influent concentration ratio, i.e., it is variable and depends on the treatment conditions and, above all, it is inversely proportional to the level of treatment.

M.J Gromiec

Papers

Application of correlation-regression method for determination of coefficients for the eckenfelder trickling filter models