Document Detail

Strategies for recovering inhibition caused by long chain fatty acids on anaerobic thermophilic biogas reactors.
MedLine Citation:
PMID:  19473835     Owner:  NLM     Status:  MEDLINE    
Long chain fatty acids (LCFA) concentrations over 1.0 gL(-1) were inhibiting manure thermophilic digestion, in batch and semi-continuous experiments, resulting in a temporary cease of the biogas production. The aim of the work was to test and evaluate several recovery actions, such as reactor feeding patterns, dilution and addition of adsorbents, in order to determine the most appropriate strategy for fast recovery of the reactor activity in manure based plants inhibited by LCFA. Dilution with active inoculum for increasing the biomass/LCFA ratio, or addition of adsorbents for adsorbing the LCFA and reducing the bioavailable LCFA concentration, were found to be the best recovery strategies, improving the recovery time from 10 to 2 days, in semi-continuously fed systems. Moreover, acclimatization was introduced by repeated inhibition and process recovery. The subsequent exposure of the anaerobic biomass to an inhibitory concentration of LCFA improved the recovery ability of the system, indicated as increasing degradation rates from 0.04 to 0.16 g COD_CH(4)/g VS day. The incubation time between subsequent pulses, or discontinuous LCFA pulses, seems to be a decisive process parameter to tackle LCFA inhibition in manure anaerobic co-digestion.
J Palatsi; M Laureni; M V Andrés; X Flotats; H B Nielsen; I Angelidaki
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-05-26
Journal Detail:
Title:  Bioresource technology     Volume:  100     ISSN:  1873-2976     ISO Abbreviation:  Bioresour. Technol.     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-07-01     Completed Date:  2009-09-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  4588-96     Citation Subset:  IM    
Department of Environmental Engineering, Technical University of Denmark, Lyngby, Denmark.
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MeSH Terms
Fatty Acids / analysis*
Fatty Acids, Volatile / analysis
Gases / metabolism*
Methane / metabolism
Toxicity Tests
Reg. No./Substance:
0/Fatty Acids; 0/Fatty Acids, Volatile; 0/Gases; 74-82-8/Methane

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