Energies,
Год журнала:
2025,
Номер
18(3), С. 731 - 731
Опубликована: Фев. 5, 2025
Peracetic
acid
(PAA)
oxidation,
which
is
a
kind
of
chemical
method
for
sludge
pretreatment,
has
been
verified
to
be
valid
promoting
anaerobic
digestion
performance.
However,
the
methane
production
still
limited
at
certain
levels
by
this
method,
because
excess
PAA
negative
effects
on
methanogens.
This
work
selected
freezing
combined
with
form
composite
pretreatment
technology
synergistically
improving
biomethane
production.
According
experimental
data,
yield
was
largely
enhanced
from
166.4
±
5.6
mL/g
volatile
suspended
solids
(VSS)
in
control
261.5
7.3
VSS
(−10
°C)
and
(0.08
g/g
TSS)
57.2%
increase
rate.
Kinetic
analysis
showed
that
potential,
rate,
hydrolysis
rate
were
promoted,
respectively,
159.4
VSS,
17.18
VSS/d,
0.104
d−1
254.9
25.69
0.125
+
pretreatment.
Mechanism
revealed
destroyed
both
extracellular
polymeric
substances
(EPS)
microbial
cells
sludge,
resulting
efficiency.
Gene
hydrolytic
microbes
(Hyphomicrobium
norank_f_Caldilineaceae),
acidogens
(e.g.,
Petrimonas,
Tissierella,
Mycobacerium)
methanogens
(Methanosaeta,
Methanosarcina,
Methanobacterium)
all
enriched
total
abundances
calculated
10.65%
22.07%
pretreated
reactors,
respectively.
Considering
technical
economic
factors,
feasible
Water Science & Technology,
Год журнала:
2025,
Номер
91(5), С. 554 - 566
Опубликована: Фев. 26, 2025
ABSTRACT
The
production
of
short-chain
fatty
acids
(SCFAs)
through
anaerobic
fermentation
is
a
significant
strategy
for
the
resource
utilization
excess
sludge
(ES).
However,
limitations
low
temperatures
and
slow
ES
hydrolysis
rates
have
resulted
in
less
than
optimal
volatile
acid
(VFA)
accumulation.
This
study
reports
new
method
improving
low-temperature
VFA
using
peracetic
(PAA)
pretreatment
elucidates
underlying
mechanisms.
results
showed
that
at
10
°C,
PAA
significantly
enhanced
release
organic
matter
during
fermentation,
increasing
soluble
chemical
oxygen
demand
concentration
liquid,
thereby
creating
conditions
subsequent
acidification
processes
VFAs
When
dosage
was
9%,
reached
approximately
239.5
mg
COD/g
suspended
solids
(VSS),
which
1.47
times
control
group.
Mechanistic
analysis
revealed
improved
under
but
inhibited
consumption,
increased
activity
enzymes
related
to
processes,
suppressed
F420,
enhancing
findings
provide
an
alternative
solution
biological
ES.
Microbial Cell Factories,
Год журнала:
2025,
Номер
24(1)
Опубликована: Март 12, 2025
Hydrogen
sulfide
(H2S)
gas,
characterized
by
its
low
odor
threshold
and
toxicity,
poses
significant
challenges
in
non-point
source
management.
Traditional
biotechnologies
are
effective
removing
malodorous
gases
from
point
sources
but
they
limited
for
control.
In
this
study,
the
sqr
pdo
genes
Cupriavidus
pinatubonensis
JMP134
were
introduced
into
bacterial
cellulose-producing
strain
Kosakonia
oryzendophytica
FY-07.
This
genetic
modification
enhanced
strain's
sulfur
oxidation
capacity,
which
increased
over
time,
with
an
average
transformation
capacity
of
approximately
275
mg·L−
1·day−
1.
By
incorporating
1%
activated
carbon,
efficient,
naturally
degradable
bio-composite
membrane
was
developed,
achieving
a
maximum
H2S
adsorption
7.3
g·m−
3·day−
FY-07
remained
stable
soil
improved
microbial
community
treatment.
The
resulting
is
environment-friendly
making
it
suitable
emergency
control
landfills.
study
offers
recommendations
using
materials
managing
hydrogen
emissions.
