Abstract

The aim was to develop a temperature and time-dependent model that can calculate the methane production in an anaerobic digester and its subsequent digestate storage tank under realistic and variable conditions. With a daily resolution, the model was applied to a Swedish dairy farm under two different climatic conditions. The most influential parameters were hydraulic retention time and the substrate specific first order reaction rates in the digester, which have a big influence on the residual biogas potential, and hence the potential methane production in the digestate storage. The management of the storage can have a large impact on the emissions from the storage due to its temperature dependence. The model can be used to support plant design and operation of anaerobic digesters and storages, but further research is needed to determine first-order reaction rates and the relationship between the ambient and digestate temperatures at different times of the year.

Keywords

Biogas; Digestate; Methane; Emissions; Model; Climate impact

Published in

Bioresource technology reports
2020, Volume: 11, article number: 100454

SLU Authors

• Ericsson, Niclas

  • Department of Energy and Technology, Swedish University of Agricultural Sciences
    

• Nordberg, Åke

  • Department of Energy and Technology, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Energy Systems
Environmental Sciences
Renewable Bioenergy Research


Publication identifier

DOI: https://doi.org/10.1016/j.biteb.2020.100454

Permanent link to this page (URI)

https://res.slu.se/id/publ/105722