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Bioengineering 2015, 2(1), 35-53; doi:10.3390/bioengineering2010035

Microbial Community Shifts during Biogas Production from Biowaste and/or Propionate

Institute of Biology for Engineers and Biotechnology of Wastewater, Karlsruhe Institute of Technology (KIT), Am Fasanengarten, Karlsruhe D-76128, Germany
Division Microbiology-Biotechnology, Faculty of Technology, University of Applied Science, Hochschule Emden-Leer, Constantiaplatz 4, Emden D-26723, Germany
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Sabine Kleinsteuber
Received: 6 November 2014 / Revised: 29 January 2015 / Accepted: 30 January 2015 / Published: 9 February 2015
(This article belongs to the Special Issue Microbial Ecology of Anaerobic Digestion)
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Propionate is the most delicate intermediate during anaerobic digestion as its degradation is thermodynamically unfavorable. To determine its maximum possible degradation rates during anaerobic digestion, a reactor was fed Monday to Friday with an organic loading rate (OLR) of 12/14 kg CODbiowaste·m−3·d−1 plus propionate up to a final OLR of 18 kg COD·m−3·d−1. No feed was supplied on weekends as it was the case in full-scale. To maintain permanently high propionate oxidizing activity (POA), a basic OLR of 3 kg CODpropionate·m−3·d−1 all week + 11 kg CODbiowaste·m−3·d−1 from Monday to Friday was supplied. Finally a reactor was operated with an OLR of 12 kg CODbiowaste·m−3·d−1 from Monday to Friday and 5 kg CODpropionate·m−3·d−1 from Friday night to Monday morning to maintain a constant gas production for permanent operation of a gas engine. The propionate degradation rates (PDRs) were determined for biowaste + propionate feeding. Decreasing PDRs during starvation were analyzed. The POA was higher after propionate supply than after biowaste feeding and decreased faster during starvation of a propionate-fed rather than a biowaste-fed inoculum. Shifts of the propionate-oxidizing and methanogenic community were determined. View Full-Text
Keywords: anaerobic co-digestion; biowaste; propionate; propionate-oxidizing bacteria (POB); methanogenic community; community shifts anaerobic co-digestion; biowaste; propionate; propionate-oxidizing bacteria (POB); methanogenic community; community shifts

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, C.; Moertelmaier, C.; Winter, J.; Gallert, C. Microbial Community Shifts during Biogas Production from Biowaste and/or Propionate. Bioengineering 2015, 2, 35-53.

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