Municipal sludge degradation kinetic in thermophilic CSTR pilot-scale reactors

De la Rubia Romero, Ángeles, Pérez, Montserrat, Sales, Diego and Romero, Luis I. (2006) Municipal sludge degradation kinetic in thermophilic CSTR pilot-scale reactors. AIChE Journal, 52 (12), 4200-4206. (doi:10.1002/aic.11004).

Abstract

The performance of a pilot-scale continuous-flow stirred-tank reactor (CSTR) treating municipal sludge under thermophilic conditions has been studied. Two pilot-scale reactors (CSTR1 (175 L) and CSTR2 (850 L)) were operated at different hydraulic residence times (: 40 to 15 days). The anaerobic sludge processes are generally affected by variations in the concentration of substrate (determined as influent volatile solids, VS) and volumetric flow, both of which lead to a modification in biomass concentration and VS removal efficiency. This unsteady-state situation is mathematically explained in terms of an autocatalytic kinetic model. The general kinetic equation in this model has been applied to experimental data obtained in CSTR1. The fit of the experimental data to the model was used to estimate kinetic parameters and the yield coefficients (max, , YP/S). The estimated parameters were max: 0.175d-1, : 0.358, YP/S: 0.309 m3CH4/kgVS). These parameters were subsequently used to model the substrate utilization rate and the methane generation rate in CSTR2. The model with the estimated parameters was found to provide excellent results, and is satisfactory in describing the concentration of VS and the methane generation rate in an actual digestion plant.

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