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

Anaerobe
Nicolas WeithmannRuth Freitag

Abstract

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. 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 ...Continue Reading

Associated Datasets

References

Oct 7, 2004·Applied and Environmental Microbiology·Massimiliano CardinaleDaniele Daffonchio
Jan 11, 2005·Applied and Environmental Microbiology·Dimitar KarakashevIrini Angelidaki
Sep 25, 2009·Applied Microbiology and Biotechnology·Peter Weiland
Jan 25, 2011·Journal of Microbiological Methods·Stefanie TöweMichael Schloter
Feb 26, 2019·MSystems·Cameron MartinoKarsten Zengler

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Citations

May 13, 2021·Anaerobe·Maja RupnikEmma Allen-Vercoe

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