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Digestion Performance of Various Combinations of Thermophilic and Mesophilic Sludge Digestion Systems

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Various combinations of single- and multi-stage anaerobic and aerobic‐anaerobic digestion systems were studied to evaluate their solids reduction potential with capabilities to control sulfur-based biosolids odor compounds. All the multi-stage digestion systems removed more volatile solids than the single-stage anaerobic digestion systems, even at the same overall retention time. However, digestion systems with mesophilic digestion as the final stage showed a much lower headspace organic sulfur content in the dewatered biosolids than the systems with thermophilic digestion as the final stage. This observation leads to the conclusion that placing a mesophilic anaerobic digestion system at the end of multi-stage digestion systems will enable greater sulfur-based odor reduction from dewatered biosolids with greater solid reduction than single-stage mesophilic or thermophilic digestion systems.
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Keywords: anaerobic digestion; combined aerobicā€anaerobic digestion; volatile organic sulfur compound; volatile solid reduction

Document Type: Research Article

Publication date: 2011-01-01

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