Microbial Community Shifts during Biogas Production from Biowaste and-or PropionateReport as inadecuate


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


Microbial Community Shifts during Biogas Production from Biowaste and-or Propionate - Download this document for free, or read online. Document in PDF available to download.

1

Institute of Biology for Engineers and Biotechnology of Wastewater, Karlsruhe Institute of Technology KIT, Am Fasanengarten, Karlsruhe D-76128, Germany

2

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

Abstract 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





Author: Chaoran Li 1,†, Christoph Moertelmaier 1,†, Josef Winter 1 and Claudia Gallert 1,2,*

Source: http://mdpi.com/



DOWNLOAD PDF




Related documents