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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 system were studied to evaluate their solids reduction potential along with capabilities to control sulfur based biosolids odor compounds. All the multi-staged digestion systems removed more volatile solids than the single stage anaerobic digestion systems even at the same overall detention time. However, digestion systems with mesophilic digestion as the final stage showed a much lower headspace organic sulfur contents 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 along with greater solid reduction.

Keywords: anaerobic digestion; combined aerobic-anaerobic digestion; volatile organic sulfur compound; volatile solid reduction

Document Type: Research Article


Publication date: 2010-01-01

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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