Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7076731 | Bioresource Technology | 2014 | 7 Pages |
Abstract
Anaerobe fermentation of sugar beet pressed pulp was investigated in pilot-scale digesters. Thermophilic adaptation of mesophilic culture was monitored using chemical analysis and metagenomic characterization of the sludge. Temperature adaptation was achieved by increasing the temperature gradually (2 °C dayâ1) and by greatly decreasing the OLR. During stable run, the OLR was increased gradually to 11.29 kg VS mâ3 dâ1 and biogas yield was 5% higher in the thermophilic reactor. VFA levels increased in the thermophilic reactor with increased OLR (acetic acid 646 mg Lâ1, propionic acid 596 mg Lâ1), then VFA decreased and the operation was manageable beside the relative high tVFA (1300-2000 mg Lâ1). The effect of thermophilic adaptation on the microbial communities was studied using a sequencing-based metagenomic approach. Connections between physico-chemical parameters and populations of bacteria and methanogen archaea were revealed.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Annamária Tukacs-Hájos, Bernadett Pap, Gergely Maróti, Judit Szendefy, Piroska Szabó, Tamás Rétfalvi,