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Sammanfattning

Background: In a previous study, single-stage processes were compared with two-stage processes, using either food waste alone or mixed with thin stillage as substrate. Overall methane yield increased (by 12%) in two-stage compared with single-stage digestion when using food waste, but decreased when food waste was co-digested with thin stillage (50:50 on VS basis). The obtained difference in methane yield was likely caused by a higher acetate level in the first stage reactor operating with food waste alone (around 20 g/L) compared to the reactor also treating thin stillage (around 8 g /L). The present study sought to shed additional light on possible causes of the large difference in methane yield by scrutinizing the microbial community in the first- and second-stage reactors, using a combined Illumina sequencing and qPCR approach.Results: In the first-stage process, acid-tolerant Aeriscardovia and Lactobacillus formed a highly efficient consortium. For food waste with high levels of acetate (20 g/L, equal to 0.14 g acetate/g VS) was produced but when thin stillage was added the pH was lower (

Nyckelord

two-stage anaerobic digestion; acetate; lactate; syntrophic acetate oxidation; microbial community analyses

Publicerad i

Frontiers in Energy Research
2020, volym: 8, artikelnummer: 105
Utgivare: FRONTIERS MEDIA SA

SLU författare

Associerade SLU-program

Food Waste

Globala målen (SDG)

SDG12 Hållbar konsumtion och produktion

UKÄ forskningsämne

Bioenergi

Publikationens identifierare

  • DOI: https://doi.org/10.3389/fenrg.2020.00105

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/107019