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Flexible feeding in anaerobic digestion – Impact on process stability, performance and microbial community structures

Title data

Weithmann, Nicolas ; Mlinar, Stanislava ; Sonnleitner, Eva ; Weig, Alfons ; Freitag, Ruth:
Flexible feeding in anaerobic digestion – Impact on process stability, performance and microbial community structures.
In: Anaerobe. (17 November 2020) . - No. 102297.
ISSN 1075-9964
DOI: https://doi.org/10.1016/j.anaerobe.2020.102297

Abstract in another language

Biogas has the potential to contribute to some of the most urgent issues of the energy transition, including mobility, energy storage, and grid stability. Flexibilization has been discussed as a means to improve the economics of biogas production, ideally restricting the production of electricity to times of strong need. Here the possibility of demand-driven, flexible biogas production is investigated, which saves substrates and storage capacity, while still enabling control over the production of electricity. Effects of different flexible feeding regimes were tested in a continuously operated 200 L reactor. After a period of 300 days under steady conditions (6.4 kg feed m−3d−1), varying flexible feeding patterns were applied over the next 700 days on top of a basic feed load of approximately 1.3 kg m−3d−1. Biogas production, volatile organic acid concentrations, and microbial dynamics were documented. Reduction of feeding resulted in reducing the gas production by up to 80% within a day. By increasing the feed, gas production could rapidly be reinitiated at similar levels as before even after fasting periods of up to 22 days. CH4-contents of the produced biogas were nearly constant over the investigation period. As a response to the flexible feeding, a reorganization of the microbial community was observed, which came to an end after 800 days and then was no longer affected by further changes in the feeding patterns or the substrate composition. Dominating archaea were of the order Methanosarcinales. During the experiment, representatives from the class Methanosaetaceae replaced representatives from the class Methanosarcinaceae.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Biogas; Community profile; Energy crop digester; Flexibilization; Flexible feeding; Methanogenic archaea
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Process Biotechnology > Chair Process Biotechnology - Univ.-Prof. Dr. Ruth Freitag
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Graduate Schools > TAO-Graduiertenkolleg Energieautarke Gebäude
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 570 Life sciences, biology
600 Technology, medicine, applied sciences
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 610 Medicine and health
Date Deposited: 18 Nov 2020 07:33
Last Modified: 18 Nov 2020 13:03
URI: https://eref.uni-bayreuth.de/id/eprint/59935