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Please use this identifier to cite or link to this item: http://hdl.handle.net/1993/3004

Title: Thermophilic anaerobic acid digestion of biosolids: hydrolysis, acidification, and optimization of retention time of acid digestion
Authors: Puchajda, B
Oleszkiewicz, J
Keywords: wastewater sludge
biosolids
anaerobic digestion
hydrolysis
acidification
kinetics
PRIMARY SLUDGE
STABILITY
KINETICS
WASTE
PHASE
Issue Date: 31-May-2006
Citation: 1496-2551; J ENVIRON ENG SCI, MAY 2006, vol. 5, no. 3, p.187 to 195.
Abstract: The objective of the study was the optimization of the retention time in a thermophilic acid digestion system. To achieve this optimization, acidification index defined as the ratio between acidification rate and hydrolysis-rate was used. First-order reaction model developed by Eastman and Ferguson (1981) was used to describe hydrolysis of particulate matter in sludge. The first-order hydrolysis rate constant was found to be 2.36 d(-1), and the initial concentration of degradable particulate COD was found to be 10.4 g/L. A model of acid digestion was proposed that included acidogenic biomass growth and decay. The total acidogenic population was estimated and kinetic parameters of acidogenic population were specific growth rate 6.78 d(-1), net specific growth rate 0.25 d(-1), decay coefficient 0.52 d(-1), and observed yield 0.05 mg biomass/mg COD consumed.,Based on the acidification index, the optimum retention time in a thermophilic acid digester was 3-3.5 d.
URI: http://hdl.handle.net/1993/3004
DOI: http://dx.doi.org/10.1139/S05-038
Appears in Collection(s):Research Publications (UofM Student, Faculty and Staff only access)

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