ACS ES&T Engineering,
Journal Year:
2024,
Volume and Issue:
4(4), P. 966 - 977
Published: March 1, 2024
Microalgae-derived
biochar
are
promising
candidates
to
accelerate
electron
transfer
during
anaerobic
digestion
(AD)
due
inherent
advantages,
but
the
mechanisms
unclear
since
they
highly
related
microalgae
species.
In
this
work,
distinct
modulated
by
derived
from
Scenedesmus
sp.
(SBC)
and
Chlorella
(CBC)
were
investigated
two-stage
AD.
Overall,
adding
enhanced
direct
interspecies
(DIET)
increasing
relative
abundance
of
microorganisms
like
Firmicutes
Methanosaeta.
Furthermore,
SBC
showed
a
foamy
honeycomb
structure
with
abundant
functional
groups,
rough
surface,
irregular
holes,
which
provided
habitats
for
microorganism
colonization
acted
as
an
conductor
facilitating
conductive
material-mediated
DIET
(i.e.,
cDIET).
Meanwhile,
CBC
closed
spherical
granule
having
smooth
surface
low
porosity,
leading
stack
on
causing
bioelectrically
triggered
bDIET)
via
upregulated
secretion
Flavins
C-type
cytochromes.
Results
indicate
that
rate
bDIET
was
one
order
magnitude
higher
than
cDIET,
resulting
in
53.9%
increase
H2
yield
9.1%
CH4
group
compared
group.
These
findings
can
enrich
knowledge
gaps
may
inspire
more
efficient
AD
processes.
