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Municipal sludge degradation kinetic in thermophilic CSTR
Author(s) -
de la Rubia Ángeles,
Pérez Montserrat,
Sales Diego,
Romero Luis I.
Publication year - 2006
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11004
Subject(s) - continuous stirred tank reactor , hydraulic retention time , bioreactor , chemistry , autocatalysis , methane , volumetric flow rate , anaerobic digestion , residence time (fluid dynamics) , yield (engineering) , substrate (aquarium) , environmental engineering , thermodynamics , pulp and paper industry , environmental science , sewage treatment , engineering , catalysis , physics , biochemistry , geotechnical engineering , oceanography , organic chemistry , geology
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 (θ: 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 (μ max , α, Y P/S ). The estimated parameters were μ max : 0.175d −1 , α: 0.358, Y P/S : 0.309 m 3 CH 4 /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. © 2006 American Institute of Chemical Engineers AIChE J, 2006