Processes,
Journal Year:
2023,
Volume and Issue:
11(3), P. 759 - 759
Published: March 4, 2023
Direct
interspecies
electron
transfer
(DIET),
which
does
not
involve
mediation
by
carriers,
is
realized
the
addition
of
conductive
materials
to
an
anaerobic
digester,
then
activates
syntrophism
between
acetogenic
and
methanogenic
microorganisms.
This
study
aimed
investigate
effect
two
materials,
zero-valent
iron
(ZVI)
magnetite,
on
methane
production
microbial
consortium
via
DIET
in
digestion
food
wastewater.
The
operation
a
batch
reactor
for
wastewater
without
yielded
biochemical
potential
(Bu),
maximum
rate
(Rm),
lag
phase
time
(λ)
0.380
Nm3
kg−1-VSadded,
15.73
mL
day−1,
0.541
days,
respectively.
Upon
1.5%
ZVI,
Bu
Rm
increased
significantly
0.434
kg−1-VSadded
19.63
respectively,
λ
was
shortened
0.065
days.
Simultaneously,
Methanomicrobiales
from
26.60%
46.90%
Methanosarcinales
decreased
14.20%
1.50%
as
ZVI
input
0%
1.50%.
Magnetite,
at
concentration
1.00%,
0.431
18.44
However,
although
magnetite
improves
efficiency
methanogenesis
DIET,
thereof
methanogen
community
remains
unclear.
Agriculture,
Journal Year:
2025,
Volume and Issue:
15(7), P. 728 - 728
Published: March 28, 2025
Anaerobic
digestion
is
an
important
technology
for
energy
recovery
from
organic
waste.
However,
methanogenesis
restricted
by
some
barriers,
such
as
the
low-speed
bottleneck
of
interspecies
electron
transfer
(IET),
low
hydrogen
partial
pressure
limitation,
trace
element
deficiency,
etc.,
resulting
in
poor
system
stability
and
methane
production.
Recently,
multiple
iron
accelerants
have
been
employed
to
overcome
above
challenges
proven
effective
enhancing
methanogenesis.
This
study
reviews
effects
(Fe0,
Fe3O4
magnetite,
Fe2O3
hematite,
salts
other
accelerants)
on
anaerobic
terms
production,
process
microbial
community
elaborates
mechanisms
mediating
direct
(DIET)
syntrophic
methanogenic
community,
strong
reducibility
promoting
methanogenesis,
provision
nutrient
elements
microorganisms,
etc.
The
potential
engineering
application
current
research
advances
regarding
environmental
impacts
are
also
summarized.
Although
exhibit
positive
digestion,
most
focuses
laboratory
small-scale
investigations,
its
large-scale
should
be
further
verified.
Future
focus
elucidating
developing
diverse
methods
different
types
systems,
optimizing
applications,
exploring
high-efficiency
strategies
accelerants.
