Document Detail

Impact of trace element addition on degradation efficiency of volatile fatty acids, oleic acid and phenyl acetate and on microbial populations in a biogas digester.
MedLine Citation:
PMID:  22683024     Owner:  NLM     Status:  Publisher    
The effect of trace element addition on anaerobic digestion of food industry- and household waste was studied using two semi-continuous lab-scale reactors, one (R30+) was supplied with Fe, Co and Ni, while the other (R30) acted as a control. Tracer analysis illustrated that methane production from acetate proceeded through syntrophic acetate oxidation (SAO) in both digesters. The effect of the trace elements was also evaluated in batch assays to determine the capacity of the microorganisms of the two digesters to degrade acetate, phenyl acetate, oleic acid or propionate, butyrate and valerate provided as a cocktail. The trace elements addition improved the performance of the process giving higher methane yields during start-up and early operation and lower levels of mainly acetate and propionate in the R30+ reactor. The batch assay showed that material from R30+ gave effects on methane production from all substrates tested. Phenyl acetate was observed to inhibit methane formation in the R30 but not in the R30+ assay. A real-time PCR analysis targeting methanogens on the order level as well as three SAO bacteria showed an increase in Methanosarcinales in the R30+ reactor over time, even though SAO continuously was the dominating pathway for methane production. Possibly, this increase explains the low VFA-levels and higher degradation rates observed in the R30+ batch incubations. These results show that the added trace elements affected the ability of the microflora to degrade VFAs as well as oleic acid and phenyl acetate in a community, where acetate utilization is dominated by SAO.
Anna Karlsson; Peter Einarsson; Anna Schnürer; Carina Sundberg; Jörgen Ejlertsson; Bo H Svensson
Related Documents :
22060844 - Evaluation of rib steak colour from friesian, hereford and charolais heifers pastured o...
24927904 - Ultrasound-assisted extraction of amino acids from grapes.
22252484 - Combinatorial triple-selective labeling as a tool to assist membrane protein backbone r...
22683024 - Impact of trace element addition on degradation efficiency of volatile fatty acids, ole...
7407704 - The lipid components of candida boidinii and hansenula polymorpha grown on methanol.
15997134 - Selective enhancement of scopadulcic acid b production in the cultured tissues of scopa...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-8
Journal Detail:
Title:  Journal of bioscience and bioengineering     Volume:  -     ISSN:  1347-4421     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888800     Medline TA:  J Biosci Bioeng     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 The Society for Biotechnology, Japan. Published by Elsevier B.V. All rights reserved.
Water and Environmental Studies, Department of Thematic Studies, Linköping University, 581 83 Linköping, Sweden.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Quantitative evaluation of the structure and function of the common carotid artery in hypertriglycer...
Next Document:  Is the obesity epidemic reversing favorable trends in blood pressure? Evidence from cohorts born bet...