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Sequential anaerobic/aerobic digestion of waste activated sludge: analysis of the process performance and kinetic study

Paper ID Volume ID Publish Year Pages File Format Full-Text
33529 44983 2011 6 PDF Available
Title
Sequential anaerobic/aerobic digestion of waste activated sludge: analysis of the process performance and kinetic study
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.

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Sequential anaerobic/aerobic digestion of waste activated sludge: analysis of the process performance and kinetic study
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Publisher
Database: Elsevier - ScienceDirect
Journal: New Biotechnology - Volume 29, Issue 1, 15 December 2011, Pages 17–22
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
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