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Anaerobic degradation of protein-rich biomass in an UASB reactor: Organic loading rate effect on product output and microbial communities dynamics

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 Nov 2020Publisher:Elsevier BVJournal:Journal of Environmental Management, volume 274, page 111,201 (issn: 0301-4797,

Authors: Cristina González-Fernández; Jose Antonio Magdalena; Silvia Greses;

doi: 10.1016/j.jenvman.2020.111201

pmid: 32798846

Anaerobic degradation of protein-rich biomass in an UASB reactor: Organic loading rate effect on product output and microbial communities dynamics

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Abstract

Anaerobic degradation of enzymatically pretreated Chlorella vulgaris was aimed in an upflow anaerobic sludge blanket reactor (UASB) to evaluate the organic loading rate (OLR) effect on biomass valorization. Low OLRs resulted in high methane yields (171 mL CH4/g CODin) at low hydraulic retention time (HRT of 6 days). Firmicutes (35-43%), Bacteroidetes (17-18%) and Euryarchaeota (11%) dominated at low OLRs, promoting methanogenic activity. On the contrary, the highest OLRs resulted in low methane yield (86 mL CH4/gCODin) with a concomitant short-chain fatty acids (SCFAs) accumulation of 37% SCFAs-COD/CODin. The highest OLR decreased UASB reactor biodiversity, hampering Euryarchaeota population development (2.5%) and boosting Firmicutes (55%) and Proteobacteria (14%). These results demonstrated the suitability of UASB reactor configuration to reach high bioprocess efficiency for both, biogas and SCFAs production, with lower energetic and area requirements than those normally needed in continuous stirred tank reactors.

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Keywords

Sewage, Microbiota, Waste Disposal, Fluid, Bioreactors, Anaerobiosis, Biomass, Chlorella vulgaris, Methane

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