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Article Dans Une Revue Bioresource Technology Année : 2024

Incorporating saline microalgae biomass in anaerobic digester treating sewage sludge: Impact on performance and microbial populations

Résumé

The aim of this study was to acclimate anaerobic prokaryotes to saline microalgae biomass. Semi-continuous experiments were conducted using two 1.5 L mesophilic reactors for 10 weeks, (hydraulic retention time of 21 days). The first reactor was solely fed with sewage sludge (control), while the second received a mixture of sewage sludge and microalgal biomass (80/20 %w/w) cultivated at 70 g·L-1 salinity. The in-reactor salinity reached after the acclimation phase was 14 g·L-1. Biomethane production was comparable between the control and acclimated reactors (205 ± 29 NmLMethane·gVolatileSolids-1). Salinity tolerance assessment of methanogenic archaea revealed that salinity causing 50% inhibition of methane production increased from 10 to 27 g·L-1 after acclimation. Microbial diversity analyses revealed notable changes in methanogenic archaea populations during co-digestion of saline microalgae biomass, particularly methylotrophic (+27%) and acetotrophic (-26%) methanogens. This study has highlighted the possibility of treating efficiently saline microalgae in co-digestion with sewage sludge in future industrial biogas plants.
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Dates et versions

hal-04487691 , version 1 (04-03-2024)

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Aurélien Parsy, Elena Ficara, Valeria Mezzanotte, Arianna Guerreschi, Remy Guyoneaud, et al.. Incorporating saline microalgae biomass in anaerobic digester treating sewage sludge: Impact on performance and microbial populations. Bioresource Technology, 2024, 397, pp.130444. ⟨10.1016/j.biortech.2024.130444⟩. ⟨hal-04487691⟩
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