Journal of Rock Mechanics and Geotechnical Engineering,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 1, 2024
The
application
of
microbially
induced
carbonate
precipitation
(MICP)
in
clayey
soils
has
attracted
much
attention,
and
many
studies
used
clay
as
an
additive
to
enhance
microbial
mineralization
efficiency
sandy
soils.
Within
the
sand-clay-bacteria-calcite
system,
property
content
play
crucial
roles
affecting
bacterial
growth
calcite
formation.
More
important,
bentonite
is
particularly
sensitive
changes
geochemical
environment.
In
this
study,
sand-bentonite
mixtures
were
treated
by
biostimulated
MICP,
aiming
provide
insights
into
behavior
system.
activity
cementation
pattern
at
different
contents
evaluated
through
a
series
tests
such
enrichment
tests,
unconfined
compressive
strength
(UCS)
measurements,
mercury
intrusion
porosimetry
(MIP)
scanning
electron
microscopy
(SEM)
observations,
energy
dispersive
X-ray
spectroscopy
(EDS)
analyses.
findings
showed
that
presence
promoted
indigenous
ureolytic
bacteria,
with
lower
levels
enhancing
activity.
Macroscopic
microscopic
characterization
indicated
bentonite-coating
sand
structure
was
more
conducive
formation
large-sized
crystals
capable
cementing
soil
particles
compared
sand-supported
bentonite-supported
structures.
Additionally,
excessive
calcium
ions
(Ca2+)
concentrations
cementitious
solution
would
lead
predominant
deposition
on
particle
surfaces,
contributing
minimally
improvement.
Ecotoxicology and Environmental Safety,
Journal Year:
2024,
Volume and Issue:
271, P. 115990 - 115990
Published: Jan. 22, 2024
Improper
disposal
practices
have
caused
environmental
disruptions,
possessing
by
heavy
metal
ions
and
radioactive
elements
in
water
soil,
where
the
innovative
sustainable
remediation
strategies
are
significantly
imperative
last
few
decades.
Microbially
induced
carbonate
precipitation
(MICP)
has
emerged
as
a
pioneering
technology
for
remediating
contaminated
soil
water.
Generally,
MICP
employs
urease-producing
microorganisms
to
decompose
urea
(NH2CONH2)
into
ammonium
(NH4+and
carbon
dioxide
(CO2),
thereby
increasing
pH
levels
inducing
(CO32−),
effectively
removing
remove
contaminants.
Nonetheless,
intricate
mechanism
underlying
mineralization
poses
significant
challenge,
constraining
its
application
contaminants
engineering,
particularly
context
of
prolonged
leaching
over
time
efficacy
adverse
conditions.
This
review
provides
comprehensive
idea
recent
development
examining
metabolic
pathways,
mineral
mechanisms,
factors
well
providing
future
perspectives
commercial
utilization.
The
use
ureolytic
bacteria
demonstrates
cost-efficiency,
compatibility,
successful
pollutant
abatement
tradition
bioremediation
techniques,
bio-synthesis
nanoparticles.
limitations
such
large-scale
application,
elevated
Ca2+levels
groundwater,
gradual
contaminant
release
need
be
overcome.
possible
research
directions
technology,
emphasizing
potential
conventional
remediation,
CO2
sequestration,
bio-material
synthesis,
role
reducing
impact
long-term
economic
benefits.
Géotechnique,
Journal Year:
2023,
Volume and Issue:
75(2), P. 153 - 165
Published: Oct. 24, 2023
Enzymatically
induced
carbonate
precipitation
(EICP)
is
a
potential
method
to
alter
the
hydraulic
properties
of
fractured
rocks.
The
pore-scale
in
situ
formation
bio-mediated
precipitated
carbonates
fracture-mimicking
channels
was
investigated
experimentally
through
visualisation
platform
and
microfluidic
technology.
Image
processing
employed
analyse
behaviour.
Three
representative
biogrouting
methods
(one-phase
continuous
injection,
one-phase
staged
injection
two-phase
injection)
role
nucleation
agents
were
examined
this
study.
Results
revealed
that
more
amorphous
substances
formed
during
process,
exhibited
superior
efficiency,
whereas
demonstrated
better
effectiveness
channel
clogging.
addition
resulted
channel-like
pattern,
compared
crystals
absence
additives.
hydrodynamic
coupling
between
flow
velocity
used
explain
mechanisms
fracture
sealing.
Precipitation
aggregation
led
reduction
microchannel
aperture,
thereby
influencing
field.
Under
flow-induced
shearing,
could
be
transported
settled
on
surface,
leading
self-enhancing
process
channelling.
This
study
provides
insights
into
microscopic
EICP
advances
application
repair.
Géotechnique,
Journal Year:
2023,
Volume and Issue:
unknown, P. 1 - 14
Published: Sept. 12, 2023
Small-strain
stiffness
and
anisotropy
of
a
sand
are
sensitive
to
the
fabric,
which
can
be
significantly
affected
by
particle
shape
cementation.
In
this
study,
multidirectional
bender
element
isotropic
compression
tests
were
performed
on
glass
sands
with
different
shapes
biocementation
levels.
The
small-strain
untreated
biotreated
systematically
investigated.
A
natural
cementation
process
is
used
investigate
cemented
sand;
might
potential
way
replicate
mechanical
behaviour
undisturbed
weak
Test
results
showed
that
increases
increasing
angularity.
It
proposed
shear
wave
velocity
has
sensitivities
parameters
for
uncemented
sands.
increase
in
angularity
decreases
stress
levels
at
an
identical
void
ratio
state.
For
lightly
biocemented
sands,
improved
after
biotreatment
reaction
calcite
bonds
among
grains.
development
specimens
first
then
level,
cannot
changed
even
normalisation
using
parameter
Hardin
equation.
Biogeotechnics,
Journal Year:
2024,
Volume and Issue:
2(4), P. 100100 - 100100
Published: May 5, 2024
In
this
review,
the
development
and
application
of
microbially
induced
carbonate
precipitation
(MICP)
technology
for
sealing
underground
engineering
fractures
are
discussed
in
detail.
The
importance
micro-fractures
an
environmentally
friendly
efficient
manner
is
emphasized,
potential
MICP
method
controlling
pore
fracture
seepage
highlighted.
fundamental
mechanisms,
key
influencing
factors,
numerical
models,
applications
fields
geological
CO2
storage
oil
resources
comprehensively
summarized
paper.
At
same
time,
limitations
existing
research
future
directions
discussed,
especially
terms
improving
processing
efficiency,
environmental
impacts,
cost
considerations.
Overall,
provides
a
new
reinforcement
geotechnical
expected
to
play
role
space
engineering.
