Molecules,
Journal Year:
2023,
Volume and Issue:
28(9), P. 3883 - 3883
Published: May 4, 2023
Anaerobic
digestion
(AD)
is
a
triple-benefit
biotechnology
for
organic
waste
treatment,
renewable
production,
and
carbon
emission
reduction.
In
the
process
of
anaerobic
digestion,
pH,
temperature,
load,
ammonia
nitrogen,
VFAs,
other
factors
affect
fermentation
efficiency
stability.
The
balance
between
generation
consumption
volatile
fatty
acids
(VFAs)
in
key
to
stable
AD
operation.
However,
accumulation
VFAs
frequently
occurs,
especially
propionate,
because
its
oxidation
has
highest
Gibbs
free
energy
when
compared
VFAs.
order
solve
this
problem,
some
strategies,
including
buffering
addition,
suspension
feeding,
decreased
loading
rate,
so
on,
have
been
proposed.
Emerging
methods,
such
as
bioaugmentation,
supplementary
trace
elements,
addition
electronic
receptors,
conductive
materials,
degasification
dissolved
hydrogen,
recently
researched,
presenting
promising
results.
But
efficacy
these
methods
still
requires
further
studies
tests
regarding
full-scale
application.
main
objective
paper
provide
comprehensive
review
mechanisms
propionate
generation,
metabolic
pathways
influencing
during
process,
recent
literature
experimental
research
related
various
strategies
enhancing
biodegradation.
issues
that
must
be
addressed
future
focus
are
identified,
potential
directions
development
predicted.
Fuel,
Journal Year:
2024,
Volume and Issue:
368, P. 131603 - 131603
Published: March 28, 2024
This
investigation
explores
the
effects
of
integrating
acid-alkali
treated
biochar
into
anaerobic
digestion
chicken
manure.
Digesters
containing
manure
with
addition
exhibited
an
8.4-fold
improvement
in
methane
production
compared
to
untreated
digesters.
In
addition,
porous
structure
promoted
microbial
acclimation,
facilitated
direct
interspecies
electron
transfer,
and
provided
anchoring
points
for
immobilisation.
Anaerobic
digesters
amended
also
demonstrated
increased
chemical
oxygen
demand
removal,
up
81.8
%,
maintained
lower
total
ammonia
concentrations
(2,478
mg/L)
levels
control
reactors
(4418
mg/L).
terms
community,
propidium
monoazide
minimised
errors
live
population
estimation,
providing
new
insights
capacity
shield
microbes
from
stress.
These
findings
highlight
biochar's
quantitative
benefits,
emphasising
its
potential
enhancing
production,
mitigating
stress,
promoting
resilience
digestion.
Chemical Engineering Journal,
Journal Year:
2024,
Volume and Issue:
484, P. 149469 - 149469
Published: Feb. 9, 2024
This
work
evaluated
the
application
of
a
novel
ex-situ
vacuum-enhanced
anaerobic
digestion
technology,
IntensiCarbTM
(IC),
which
decouples
hydraulic
retention
time
(HRT)
from
solids
(SRT),
and
strips
ammonia
at
neutral
pH.
Four
bench-scale
reactors
were
daily
fed
with
50/50
(v/v)
mix
primary
sludge
(PS)
thickened
waste-activated
(TWAS).
Three
operated
SRT
20d
intensification
factors
(IF
=
SRT/HRT)
1
(control),
2,
3,
while
fourth
was
an
IF4
30d.
The
findings
showed
that
OLR
5.1
±
0.79
kgCOD/m3/d,
3
times
control,
COD
volatile
reduction
maintained
around
50
%.
methanogenic
community,
most
vulnerable
ones
to
high
toxicity,
dominated
by
Methanosarcinaceae
in
IC
digesters
versus
Methanoseata
control
digester.
Specific
activity
(SMA)
biomethanation
potential
tests
(BMP)
on
digestates
indicated
35
%-62
%
higher
activity,
relative
control.
enhanced
performance
due
combination
increased
biomass
concentration,
mitigation
toxicity
loadings,
microbial
shift.
Reduced
digester
size
organic
loading
rates
(OLR)
are
two
main
benefits
IC-AD
technology.
Recovery
influent
total
nitrogen
clean
water
is
another
promising
aspect
technology
enables
running
but
comparable
concentration.
recovery
reduced
N
recycle
streams,
thus
minimizing
need
for
side-stream
treatment
mainstream
removal,
additional
benefits.
Fermentation,
Journal Year:
2023,
Volume and Issue:
9(9), P. 798 - 798
Published: Aug. 29, 2023
Digesters
at
water
resource
recovery
facilities
(WRRFs)
operating
different
temperatures
within
the
mesophilic
and
thermophilic
temperature
range
is
a
flexibilization
concept
to
contribute
heat
management.
Four
25
L
digesters
were
fed
with
sewage
sludge
from
municipal
WRRF
operated
37,
43,
47
53
°C,
respectively,
describe
changes
in
overall
process
performance
microbiota.
Specific
methane
yield
COD
degradation
rates
highest
only
being
up
7%
higher
compared
37
°C.
The
increase
pH
concentrations
of
NH4-N
PO4-P
above
43
°C
statistically
significant.
effect
on
microbial
community
was
strong,
indicating
both
constant
specialization
towards
organisms
as
well
change
acetoclastic
hydrogenotrophic/methylotrophic
methanogenesis.
influence
process-engineering
physicochemical
aspects
rather
small
Environmental Technology & Innovation,
Journal Year:
2023,
Volume and Issue:
30, P. 103044 - 103044
Published: Feb. 2, 2023
The
present
study
investigates
the
performance
of
upflow
anaerobic
sludge
blanket
(UASB)
reactor
for
stable
H2
production
from
starchy
wastewater
supplemented
with
groundnut
de-oiled
cake
using
mixed
consortia.
Insufficient
reports
are
available
on
UASB
reactor.
Operation
was
divided
into
two
stages
i.e.,
start-up
period
where
desirable
height
developed
and
different
hydraulic
retention
time
(HRT)
examined
production.
maximum
rate
12.3
L
L−1
d−1was
observed
at
3
h
HRT.
Details
physicochemical
characteristics
granular
were
studied
SEM-EDX
image,
FTIR
spectra,
particle
size
analyser,
SVI
value,
EPS
metal
content.
Kinetic
analysis
process
revealed
that
Grau,
modified
Stover-Kicannon
most
suitable
producing
This
is
first
report
to
implement
these
advanced
bio-kinetic
models
substrate
consumption
hydrogen
in
Furthermore,
a
potential
toward
circular
bioeconomy
model
has
been
discussed
accomplishment
resource
recovery
minimum
waste
generation.
