Sammanfattning

The present study investigates the conversion of acetate, propionate and hydrogen consumption linked to the microbial community structure and related to temperature and substrate concentration. Biogas reactors were continuously fed with coffee powder (20 g-COD/L) or acetate (20, 40, and 60 g-COD/L) and operated for 193 days at 37 degrees C or 55 degrees C conditions. Starting HRT was 23 days which was then reduced to 7 days. The kinetics of acetate and propionate degradation and hydrogen consumption rates were measured in batch assays. At HRT 7 days, the degradation rate of propionate was higher in thermophilic batches, while acetate degradation rate was higher at mesophilic conditions. The gaseous hydrogen consumption in acetate reactors increased proportionally with temperature and substrate concentration, while the dissolved hydrogen was not affected. The relative high abundance of hydrogentrophic methanogens indicated that the methanogenesis was directed towards the syntrophic acetate oxidation pathway at high acetate concentration and high temperature.

Nyckelord

Temperature and substrate; Acetate; Propionate; Hydrogen; Microbial community structure

Publicerad i

Bioresource Technology
2018, Volym: 256, sidor: 44-52
Utgivare: ELSEVIER SCI LTD

SLU författare

• Westerholm, Maria

  • Institutionen för molekylära vetenskaper, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Bioenergi


Publikationens identifierare

DOI: https://doi.org/10.1016/j.biortech.2018.01.150

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/94716