In this work, the sequential anaerobic-aerobic digestion was applied to waste activated sludge of a full scale wastewater treatment plant. Aerobic temperatures of 20 and 37 °C were tested. Once verified the positive effect of the increased aerobic temperature on the process efficiency, kinetic tests were performed at T=37 °C to characterize VS degradation and protein and polysaccharides trends in both digestion phases. Different models (i.e. 1st order, Michaelis-Menten, Valentini et al., Contois) were tested and compared for VS degradation: Contois equation provided the best fitting of experimental data with correlation coefficients always >= 0.99. Kinetic modelling of biopolymers fate was performed by taking into account their production from the hydrolysis of particulate organic substrate and their biodegradation in the different anaerobic and aerobic reaction environments. Satisfactory and reliable predictions were obtained with correlation coefficients R2 equal to 0.98 and 0.95, for carbohydrates and proteins, respectively.
Biopolymer fate and modelling in sequential mesophilic anaerobic-aerobic digestion of waste activated sludge
D Mosca Angelucci;MC Tomei
2016
Abstract
In this work, the sequential anaerobic-aerobic digestion was applied to waste activated sludge of a full scale wastewater treatment plant. Aerobic temperatures of 20 and 37 °C were tested. Once verified the positive effect of the increased aerobic temperature on the process efficiency, kinetic tests were performed at T=37 °C to characterize VS degradation and protein and polysaccharides trends in both digestion phases. Different models (i.e. 1st order, Michaelis-Menten, Valentini et al., Contois) were tested and compared for VS degradation: Contois equation provided the best fitting of experimental data with correlation coefficients always >= 0.99. Kinetic modelling of biopolymers fate was performed by taking into account their production from the hydrolysis of particulate organic substrate and their biodegradation in the different anaerobic and aerobic reaction environments. Satisfactory and reliable predictions were obtained with correlation coefficients R2 equal to 0.98 and 0.95, for carbohydrates and proteins, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
