Effect of agitation time on nutrient distribution in full-scale CSTR biogas digesters

Philipp Kress; Hans-Joachim Nägele; Hans Oechsner; Stephan Ruile

doi:10.1016/j.biortech.2017.09.054

Effect of agitation time on nutrient distribution in full-scale CSTR biogas digesters

Bioresour Technol. 2018 Jan:247:1-6. doi: 10.1016/j.biortech.2017.09.054. Epub 2017 Sep 11.

Authors

Philipp Kress¹, Hans-Joachim Nägele², Hans Oechsner², Stephan Ruile²

Affiliations

¹ University of Hohenheim, State Institute of Agricultural Engineering and Bioenergy, Garbenstraße 9, Stuttgart 70599, Germany. Electronic address: philipp.kress@uni-hohenheim.de.
² University of Hohenheim, State Institute of Agricultural Engineering and Bioenergy, Garbenstraße 9, Stuttgart 70599, Germany.

PMID: 28942207
DOI: 10.1016/j.biortech.2017.09.054

Abstract

The aim of this work was to study the impact of reduced mixing time in a full-scale CSTR biogas reactor from 10 to 5 and to 2min in half an hour on the distribution of DM, acetic acid and FOS/TAC as a measure to cut electricity consumption. The parameters in the digestate were unevenly distributed with the highest concentration measured at the point of feeding. By reducing mixing time, the FOS/TAC value increases by 16.6%. A reduced mixing time of 2min lead to an accumulation of 15% biogas in the digestate.

Keywords: Biogas; Full-scale; Mixing quality; Nutrient distribution.

MeSH terms

Anaerobiosis
Biofuels*
Bioreactors*
Food

Substances

Biofuels