Environment International,
Journal Year:
2019,
Volume and Issue:
133, P. 105257 - 105257
Published: Oct. 31, 2019
Hydrothermal
liquefaction
of
sewage
sludge
to
produce
bio-oil
and
hydro-char
unavoidably
results
in
the
production
high-strength
organic
wastewater
(HTLWW).
However,
anaerobic
digestion
(AD)
HTLWW
generally
has
low
conversion
efficiency
due
presence
complex
refractory
organics.
The
present
study
showed
that
granular
activated
carbon
(GAC)
promoted
AD
continuous
experiments,
resulting
higher
methane
yield
(259
mL/g
COD)
compared
control
experiment
(202
COD).
It
was
found
GAC
increased
activities
both
aceticlastic
hydrogenotrophic
methanogens.
molecular
transformation
organics
further
analyzed.
shown
degradation
soluble
microbial
by-products,
fulvic-
humic-like
substances
as
revealed
by
3-dimensional
fluorescence
excitation-emission
matrix
(3D-EEM)
analysis.
Gas
chromatography
mass
spectrometry
(GC-MS)
analysis
resulted
N-heterocyclic
compounds,
acids
aromatic
compounds
less
new
species.
Fourier
transform
ion
cyclotron
resonance
(FT-ICR-MS)
also
nitrogenous
In
addition,
it
improved
removal
oxidized,
nitrogen
content,
double
bond
equivalent
(DBE)
compounds.
Microbial
not
only
concentration,
but
enriched
more
syntrophic
bacteria
(e.g.,
Syntrophorhabdus
Synergistes),
which
were
capable
degrading
a
wide
range
different
including
Furthermore,
profound
effects
on
methanogens
enrichment
Methanothrix
instead
Methanosarcina
observed.
Overall,
mechanism
with
GAC.
iScience,
Journal Year:
2020,
Volume and Issue:
23(12), P. 101794 - 101794
Published: Nov. 10, 2020
Anaerobic
digestion
was
one
of
the
first
bioenergy
strategies
developed,
yet
interactions
microbial
community
that
is
responsible
for
production
methane
are
still
poorly
understood.
For
example,
it
has
only
recently
been
recognized
bacteria
oxidize
organic
waste
components
can
forge
electrical
connections
with
methane-producing
microbes
through
biologically
produced,
protein-based,
conductive
circuits.
This
direct
interspecies
electron
transfer
(DIET)
faster
than
exchange
via
diffusive
carriers,
such
as
H2.
DIET
also
more
resilient
to
perturbations
increases
in
load
inputs
or
toxic
compounds.
However,
current
digester
practices
rarely
predominates.
Improvements
anaerobic
associated
addition
electrically
materials
have
attributed
increased
DIET,
but
experimental
verification
lacking.
deficiency
may
soon
be
overcome
improved
understanding
diversity
capable
which
leading
molecular
tools
determining
extent
DIET.
Here
we
review
microbiology
suggest
monitoring
digesters,
and
propose
approaches
re-engineering
design
encourage
