Water Science & Technology,
Год журнала:
2024,
Номер
90(2), С. 446 - 460
Опубликована: Июль 4, 2024
ABSTRACT
This
study
compared
an
anaerobic
baffled
reactor
(ABR)
with
a
multi-staged
UASB
(MS-UASB)
to
investigate
the
effects
of
loading
shocks
on
digestion
in
both
reactors.
Both
reactors
were
subjected
five
hydraulic/organic
shocks,
each
lasting
3
days.
During
hydraulic
shock
highest
organic
rate
(OLR)
(OLR
24
g
COD
L−1
d−1),
MS-UASB
and
ABR
exhibited
minimum
effluent
removal
efficiency
90.9
73.0%,
average
methane
concentrations
decreasing
62.4
±
0.9%
59.8
3.0%.
Under
12
was
81.5
73.4%,
60.4
1.1%
58.6
0.8%.
After
phase,
biomass
concentration
reached
159
130%
ABR,
respectively.
The
reason
for
improved
operational
stability
is
due
presence
solid/liquid/gas
separator,
which
promotes
formation
granular
sludge
reduces
washout.
In
addition,
higher
abundance
syntrophic
bacterium
Candidatus
cloacamonas,
plays
crucial
role
maintaining
systems.
Microorganisms,
Год журнала:
2022,
Номер
10(11), С. 2142 - 2142
Опубликована: Окт. 29, 2022
Waste
and
wastewater
containing
hydrocarbons
are
produced
worldwide
by
various
oil-based
industries,
whose
activities
also
contribute
to
the
occurrence
of
oil
spills
throughout
globe,
causing
severe
environmental
contamination.
Anaerobic
microorganisms
with
ability
biodegrade
petroleum
important
in
treatment
contaminated
matrices,
both
situ
deep
subsurfaces,
or
ex
bioreactors.
In
latter,
part
energetic
value
these
compounds
can
be
recovered
form
biogas.
degradation
improved
iron
compounds,
but
different
species
exert
distinct
effects.
For
example,
Fe(III)
used
as
an
electron
acceptor
microbial
hydrocarbon
degradation,
zero-valent
donate
electrons
for
enhanced
methanogenesis,
conductive
oxides
may
facilitate
transfers
methanogenic
processes.
Iron
act
adsorbents,
involved
secondary
abiotic
reactions,
overall
promoting
biodegradation.
These
multiple
roles
comprehensively
reviewed
this
paper
linked
key
functional
processes,
underlying
mechanisms,
main
influential
factors.
Recent
research
progress,
future
perspectives,
remaining
challenges
on
application
iron-assisted
anaerobic
highlighted.
Processes,
Год журнала:
2023,
Номер
11(4), С. 1016 - 1016
Опубликована: Март 27, 2023
The
anaerobic
digestion
(AD)
of
biomass
is
a
green
technology
with
known
environmental
benefits
for
biogas
generation.
yield
from
existing
substrates
and
the
biodegradability
biomasses
can
be
improved
by
conventional
or
novel
enhancement
techniques,
such
as
addition
iron-based
nanoparticles
(NPs).
In
this
study,
effect
different
concentrations
Fe2O3-based
NPs
on
AD
brown
macroalga
Sargassum
spp.
has
been
investigated
30
days
trials.
was
evaluated
at
concentrations.
control
sample
yielded
value
80.25
±
3.21
NmLCH4/gVS.
When
5
mg/g
substrate
10
Fe2O3
were
added
to
sample,
increased
24.07%
26.97%,
respectively.
Instead,
when
50
negative
observed,
biomethane
decreased
38.97%.
Therefore,
low
favor
process,
whereas
high
have
an
inhibitory
effect.
Direct
interspecies
electron
transfer
(DIET)
via
their
insolubility
play
important
role
in
facilitating
methanogenesis
process
during
AD.
Sustainability,
Год журнала:
2022,
Номер
15(1), С. 521 - 521
Опубликована: Дек. 28, 2022
The
black-odor
phenomenon
has
been
widely
reported
worldwide
and
recognized
as
a
global
ecological
risk
for
aquatic
environments.
However,
driving
factors
black-odor-related
microorganisms
potential
self-remediation
strategies
are
still
poorly
understood.
This
study
collected
eight
water
samples
(sites
A–H)
disturbed
by
different
from
the
Jishan
River
located
in
Jinmen,
Hubei
Province,
China.
Black-odor-related
environmental
functional
bacterial
structure
were
further
measured
based
on
basic
physicochemical
parameters.
results
indicated
that
types
of
conditions
shape
distribution
quality
microbial
community
structures.
Site
B,
which
was
dams,
had
worst
quality,
lowest
abundance
microbes
Mn,
Fe,
S
biotransformation,
highest
fermentation.
natural
wetlands
surrounding
terminus
river
(site
H)
keys
to
eliminating
phenomenon.
Potential
black-odor-forming
include
Lactococcus,
Veillonella,
Clostridium
sensu
stricto,
Trichococcus,
Rhodoferax,
Sulfurospirillum,
Desulfobulbus,
Anaeromusa-Anaeroarcus.
black-odor-repairing
Acinetobacter,
Mycobacterium,
Acidovorax.
pH
COD
paramount
physiochemical
contributing
blackening-odor-related
microorganisms.
deepens
our
understanding
provides
theoretical
basis
eradicating
Processes,
Год журнала:
2022,
Номер
10(9), С. 1758 - 1758
Опубликована: Сен. 2, 2022
Heavy
metal
pollution
is
a
serious
concern
of
the
modern
era
due
to
its
widespread
negative
effects
on
human
health
and
environment.
Conventional
technologies
applied
for
uptake
this
category
persistent
pollutants
are
complex,
often
expensive,
inefficient
at
low
concentrations.
In
last
few
years,
non-conventional
alternatives
have
been
studied
in
search
better
solutions
terms
costs
sustainability.
Microbial
adsorbents
one
biomass-based
sorbents
that
extensively
demonstrated
excellent
heavy
metals
removal
capacity
even
However,
most
carried-out
research
regarding
their
application
wastewater
treatment
has
performed
discontinuous
systems.
The
use
microorganisms
ions
continuous
systems
could
be
an
important
step
upscale
remediation
processes
since
it
facilitates
faster
higher
quantities
wastewaters
loaded
with
metals,
comparison
batch
removal.
Thus,
current
aims
analyze
available
studies
focusing
from
using
microorganisms,
systems,
focus
obtained
performances,
optimized
experimental
conditions,
sustainability
bioremoval
process.
present
work
found
microbial-based
very
good
performances
Further
analyses
required
order
apply
bioremediation
technology
environmentally
friendly
way
large-scale
facilities.
