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• W1973459105 abstract "Sequential anaerobic–aerobic digestion was applied to waste activated sludge (WAS) of a full scale wastewater treatment plant. The study was performed with the objective of testing the sequential digestion process on WAS, which is characterized by worse digestibility in comparison with the mixed sludge. Process performance was evaluated in terms of biogas production, volatile solids (VS) and COD reduction, and patterns of biopolymers (proteins and polysaccharides) in the subsequent digestion stages. VS removal efficiency of 40%, in the anaerobic phase, and an additional removal of 26%, in the aerobic one, were observed. For total COD removal efficiencies of 35% and 25% for anaerobic and aerobic stage respectively, were obtained. Kinetics of VS degradation process was analyzed by assuming a first order equation with respect to VS concentration. Evaluated kinetic parameters were 0.44 ± 0.20 d−1 and 0.25 ± 0.15 d−1 for the anaerobic stage and aerobic stage, respectively. With regard to biopolymers, in the anaerobic phase the content of proteins and polysaccharides increased to 50% and 69%, respectively, whereas in the subsequent aerobic phase, a decrease of 71% for proteins and 67% for polysaccharides was observed. The average specific biogas production 0.74 m3/(kgVS destroyed), was in the range of values reported in the specialized literature for conventional anaerobic mesophilic WAS digestion." @default.
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• W1973459105 date "2011-12-01" @default.
• W1973459105 modified "2023-09-24" @default.
• W1973459105 title "Sequential anaerobic/aerobic digestion of waste activated sludge: analysis of the process performance and kinetic study" @default.
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• W1973459105 doi "https://doi.org/10.1016/j.nbt.2011.03.006" @default.
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