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Influence of mixing and sludge volume on stability, reproducibility, and productivity of laboratory-scale anaerobic digestion

Title data

Mlinar, Stanislava ; Weig, Alfons R. ; Freitag, Ruth:
Influence of mixing and sludge volume on stability, reproducibility, and productivity of laboratory-scale anaerobic digestion.
In: Bioresource Technology Reports. Vol. 11 (14 May 2020) . - No. 100444.
ISSN 2589-014X
DOI: https://doi.org/10.1016/j.biteb.2020.100444

Abstract in another language

Anaerobic digestion processes were compared in multiple reactors using glucose and starch as substrates. For reproducibility studies, five reactors were run in parallel as consecutive 7d-batches and supplied with increasing amounts of starch (2 to 13 g L−1). For concentration < 10 g L−1, production of biogas and organic acids as well as the population structure changed but remained similar, while populations split and statistically significant differences in metabolic intermediate concentration and biogas composition/volume were observed at higher starch concentrations. Based on this reproducibility study, the influence of sludge volume and mixing intensity were investigated using reactors with working volumes of 0.75 L and 1.5 L, with and without mechanical mixing. Mixing positively influenced reaction rates at lower substrate concentrations (up to 4 g L−1), while a negative influence on the process stability was observed at higher concentrations. In general, the larger reactors showed better productivities and stabilities than the corresponding smaller ones.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Anaerobic digestion; Reproducibility; Mixing; Productivity; Geometry
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Engineering Science > Chair Process Biotechnology > Chair Process Biotechnology - Univ.-Prof. Dr. Ruth Freitag
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 570 Life sciences, biology
Date Deposited: 29 May 2020 08:37
Last Modified: 29 May 2020 08:37
URI: https://eref.uni-bayreuth.de/id/eprint/55187