4.8 Article

Impacts of mixing on foaming, methane production, stratification and microbial community in full-scale anaerobic co-digestion process

Journal

BIORESOURCE TECHNOLOGY
Volume 281, Issue -, Pages 226-233

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.02.077

Keywords

Anaerobic co-digestion; Foaming; Digester mixing; Biomolecular techniques; Microbial community

Funding

  1. Centre for Technology in Water and Wastewater, University of Technology Sydney

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This study investigated the impact of mixing on key factors including foaming, substrate stratification, methane production and microbial community in three full scale anaerobic digesters. Digester foaming was observed at one plant that co-digested sewage sludge and food waste, and was operated without mixing. The lack of mixing led to uneven distribution of total chemical oxygen demand (tCOD) and volatile solid (VS) as well as methane production within the digester. 16S rRNA gene-based community analysis clearly differentiated the microbial community from the top and bottom. By contrast, foaming and substrate stratification were not observed at the other two plants with internal circulation mixing. The abundance of methanogens (Methanomicrobia) at the top was about four times higher than at the bottom, correlating to much higher methane production from the top verified by ex-situ biomethane assay, causing foaming. This result is consistent with foaming potential assessment of digestate samples from the digester.

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