Water,
Год журнала:
2024,
Номер
16(22), С. 3276 - 3276
Опубликована: Ноя. 14, 2024
This
study
investigated
the
microbiological
and
parasitic
quality
of
sewage
sludge
treated
in
drying
beds
Algeria,
aiming
to
contribute
a
better
understanding
factors
influencing
safety
for
potential
agricultural
applications
Algerian
context.
The
research
focused
on
various
types
(liquid,
semi-solid,
solid)
their
behavior
across
different
seasons.
Standard
methods
were
employed
quantify
total
coliforms,
fecal
streptococci,
E.
coli,
Clostridium.
Controls
implemented
ensure
accuracy,
with
positive
controls
validating
detection
using
known
quantities
microorganisms
parasites,
while
negative
confirmed
absence
contamination
testing
environment.
Parasitic
was
assessed
through
microscopic
examination
protozoa
helminths.
Results
revealed
substantial
variation
microbial
concentrations
Liquid
sludge,
particularly
during
summer,
exhibited
highest
levels
coliforms
(up
7.021
log10)
coli
6.049
log10),
solid
showed
lower
counts.
Seasonal
trends
indicated
increased
warmer
months.
prevalent
81%
samples,
protozoan
cysts
(e.g.,
Giardia
intestinalis
Endolimax
nanus)
helminth
eggs
detected.
Despite
reducing
loads,
processes
alone
insufficient,
leaving
significant
contamination.
Enhanced
protocols
are
needed,
such
as
longer
periods,
chemical
disinfectants,
or
advanced
technologies
like
anaerobic
digestion
composting.
highlights
need
locally
adapted
treatment
strategies.
Furthermore,
this
provides
specific
recommendations
improving
management
practices
taking
into
account
unique
environmental
context
country.
Water,
Год журнала:
2025,
Номер
17(4), С. 490 - 490
Опубликована: Фев. 9, 2025
Triclosan
(TCS)
is
extensively
detected
in
wastewater
and
waste-activated
sludge
(WAS).
The
occurrence
fate
of
TCS
anaerobic
digestion
have
been
well
revealed,
but
the
change
during
WAS
pretreatment
needs
to
be
clarified.
Thermal
hydrolysis
has
proven
efficient
for
both
removal,
with
a
removal
efficiency
54.0%
retention
time
90
min
at
170
°C.
Alkaline
remarkably
changed
distribution
between
liquid,
solid–liquid
coefficient
decreased
by
three
orders
magnitude
as
pH
increased
13.
Neither
alkaline
nor
thermal–alkaline
resulted
obvious
TCS.
UP
demonstrated
limited
WAS,
migration
Thus,
this
study
that
methods
operational
parameters
significantly
influence
It
also
provides
valuable
reference
future
studies
on
degradation
behavior
lays
foundation
development
treatment
engineering
capable
efficiently
removing
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(31), С. 13833 - 13844
Опубликована: Июль 16, 2024
The
emerging
contaminant
triclosan
(TCS)
is
widely
distributed
both
in
surface
water
and
wastewater
poses
a
threat
to
aquatic
organisms
human
health
due
its
resistance
degradation.
dioxygenase
enzyme
TcsAB
has
been
speculated
perform
the
initial
degradation
of
TCS,
but
precise
catalytic
mechanism
remains
unclear.
In
this
study,
function
was
elucidated
using
multiple
biochemical
molecular
biology
methods.
Escherichia
coli
BL21(DE3)
heterologously
expressing
tcsAB
from
Sphingomonas
sp.
RD1
converted
TCS
2,4-dichlorophenol.
belongs
group
IA
family
two-component
Rieske
nonheme
iron
ring-hydroxylating
dioxygenases.
highest
amino
acid
identity
TcsA
large
subunits
other
dioxygenases
same
only
35.50%,
indicating
that
novel
dioxygenase.
Mutagenesis
residues
near
substrate
binding
pocket
decreased
TCS-degrading
activity
narrowed
spectrum,
except
for
TcsAF343A
mutant.
A
meta-analysis
1492
samples
treatment
systems
worldwide
revealed
tcsA
genes
are
distributed.
This
study
first
report
TCS-specific
responsible
TCS.
Studying
microbial
crucial
removing
pollutant
environment.
The Science of The Total Environment,
Год журнала:
2024,
Номер
924, С. 171555 - 171555
Опубликована: Март 12, 2024
Sludge
is
a
major
by-product
and
the
final
reservoir
of
antibiotic
resistance
genes
(ARGs)
in
wastewater
treatment
plants
(WWTPs).
Temperature-phased
anaerobic
digestion
(TPAD),
consisting
thermophilic
(AD)
(55
°C)
mesophilic
AD
processes
(37
°C),
has
been
implemented
WWTPs
for
sludge
reduction
while
improving
biomethane
production.
However,
impact
TPAD
on
ARGs'
fate
still
undiscovered
lab-scale
experiments
full-scale
WWTPs.
This
study,
first
time,
investigated
ARGs
during
process
across
three
seasons
full-size
WWTP.
Ten
typical
one
integrase
gene
class
1
integron
(intI1)
involving
horizontal
transfer
were
examined
before
after
each
step
process.
reduced
aac(6′)-Ib-cr,
blaTEM,
drfA1,
sul1,
sul2,
ermb,
mefA,
tetA,
tetB
tetX
by
87.3–100.0
%.
overall
average
absolute
abundance
targeted
intI1
92.39
%
92.50
%,
respectively.
The
was
higher
winter
than
summer
autumn
TPAD.
During
processes,
played
role
removal
ARGs,
contributing
to
>60
subsequent
contributed
further
31
ARGs.
microbial
community
analysis
revealed
that
hosts,
resistant
bacteria.
In
addition,
intI1,
did
not
reproduce
AD,
also
decline
study
demonstrates
can
effectively
reduce
sludge,
which
will
suppress
transmission
from
into
natural
environment
deliver
environmental
health
benefits
our
society.
Resources Conservation and Recycling,
Год журнала:
2024,
Номер
204, С. 107496 - 107496
Опубликована: Фев. 22, 2024
Sludge,
as
a
sustainable
energy
source
and
pollutant
matrix,
necessitates
effective
management.
The
environmental,
economic
impacts
of
sludge
management
practices
in
Australia
remained
unknown.
Furthermore,
lignosulfonate
addition
was
recently
reported
promising
approach
to
enhance
the
production
from
sludge,
benefits
which
on
have
not
been
explored.
Life
cycle
assessment
four
scenarios:
two
traditional
(A:
land
application
digested
B:
composting
before
application)
innovative
(A
B
with
during
digestion
process
-
C
D)
conducted.
Traditional
scenario
A
outperformed
B,
2.24-fold
reduction
environmental
footprints,
16.28-fold
higher
recovery,
reduced
expenditure
reaching
$78.23/t
dry
(DS).
Scenario
demonstrated
superior
results
1.26-fold
decrease
1.51-fold
more
recovery
than
A,
shift
$5.36/t
DS.
Sensitivity
analysis
revealed
sensitive
sludge's
total
volatile
solids
content,
highlighting
importance
optimization
for
best
performance.
These
findings
guide
environmentally
economically
viable
management,
emphasizing
efficient
recovery.
Water Research X,
Год журнала:
2024,
Номер
25, С. 100255 - 100255
Опубликована: Сен. 1, 2024
Climate
change
is
driving
global
endeavours
to
achieve
carbon
neutrality
and
renewable
energy
expansion.
Sludge,
a
nutrient-rich
waste,
holds
potential
yet
poses
environmental
challenges
that
need
proper
management.
We
conducted
comprehensive
life
cycle
assessment
evaluate
the
balance
footprint
of
most
commonly
used
sludge
management
scenarios
in
BRICS
countries,
namely
Brazil,
Russia,
India,
China,
South
Africa.
Technologies
such
as
incineration
anaerobic
digestion
with
recovery
units
(i.e.,
cogeneration
unit)
maximize
minimize
footprint,
showing
superior
performance.
Shifting
from
worst
best
can
boost
production
by
1.4-98.4
times
cut
1.5-21.4
times.
In
2050,
these
improvements
could
lead
98-fold
generation
25-fold
drop
emissions,
according
Announced
Pledges
Scenarios.
Optimizing
parameters
volatile
solids
efficiency
further
boosts
output
minimizes
footprint.
This
study
offers
robust
evidence
support
sustainable
thus
promote
goals,
guide
technological
transitions,
inform
policymaking
for
development.
