TY - JOUR
T1 - Strategies for recovering inhibition caused by long chain fatty acids on anaerobic thermophilic biogas reactors
AU - Palatsi, J.
AU - Laureni, M.
AU - Andres, M.V.
AU - Flotats, X.
AU - Bangsø Nielsen, Henrik
AU - Angelidaki, Irini
PY - 2009
Y1 - 2009
N2 - Long chain fatty acids (LCFA) concentrations over 1.0 g L1 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_CH4/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.
© 2009 Elsevier Ltd. All rights reserved
AB - Long chain fatty acids (LCFA) concentrations over 1.0 g L1 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_CH4/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.
© 2009 Elsevier Ltd. All rights reserved
KW - Bio energy
KW - Biomass gasification
KW - Bioenergi
KW - Bioforgasning
U2 - 10.1016/j.biortech.2009.04.046
DO - 10.1016/j.biortech.2009.04.046
M3 - Journal article
SN - 0960-8524
VL - 100
SP - 4588
EP - 4596
JO - Bioresource Technology
JF - Bioresource Technology
IS - 20
ER -