« Previous Abstract"Evolution of the human cold/menthol receptor, TRPM8"    Next AbstractHigh infestation levels of Schizotetranychus oryzae severely affects rice metabolism »

Microorganisms

Title:		Effect of Inoculum Pretreatment on the Composition of Microbial Communities in Anaerobic Digesters Producing Volatile Fatty Acids
Author(s):		Blasco L; Kahala M; Tampio E; Vainio M; Ervasti S; Rasi S;
Address:		"Natural Resources Institute Finland (Luke), Production Systems, Tietotie 4, FI-31600 Jokioinen, Finland"
Journal Title:		Microorganisms
Year:		2020
Volume:		20200417
Issue:		4
Page Number:		-
DOI:		10.3390/microorganisms8040581
ISSN/ISBN:		2076-2607 (Print) 2076-2607 (Electronic) 2076-2607 (Linking)
Abstract:		"Volatile fatty acids (VFAs) are intermediates in the methane formation pathway of anaerobic digestion and can be produced through the fermentation of organic wastes. VFAs have become an anticipated resource- and cost-effective way to replace fossil resources with higher added value and more versatile fuels and chemicals. However, there are still challenges in the production of targeted compounds from diverse and complex biomasses, such as urban biowastes. In this study, the aim was to modulate the microbial communities through inoculum treatment to enhance the production of green chemicals. Thermal and freeze-thaw treatments were applied to the anaerobic digester inoculum to inhibit the growth of methanogens and to enhance the performance of acidogenic and acetogenic bacteria. VFA fermentation after different inoculum treatments was studied in batch scale using urban biowaste as the substrate and the process performance was assessed with chemical and microbial analyses. Inoculum treatments, especially thermal treatment, were shown to increase VFA yields, which were also correlating with the dynamics of the microbial communities and retention times of the test. There was a strong correlation between VFA production and the relative abundances of the microbial orders Clostridiales (families Ruminococcaceae, Lachnospiraceae and Clostridiaceae), and Lactobacillales. A syntrophic relationship of these taxa with members of the Methanobacteriales order was also presumed"
Keywords:		16S rDNA amplicon sequencing anaerobic digestion biowaste methanogenic archaea microbial communities volatile fatty acids;
Notes:		"PubMed-not-MEDLINEBlasco, Lucia Kahala, Minna Tampio, Elina Vainio, Markku Ervasti, Satu Rasi, Saija eng Switzerland 2020/04/23 Microorganisms. 2020 Apr 17; 8(4):581. doi: 10.3390/microorganisms8040581"