Environmental Research and Technology,
Journal Year:
2023,
Volume and Issue:
6(4), P. 317 - 325
Published: Sept. 24, 2023
Co-digestion
potential
of
the
wastewater
treatment
sludges
produced
at
two
industries
with
different
characteristics
was
investigated
in
anaerobic
batch
reactors
operated
mesophilic
(35±2
°C)
condition.
The
sludge
sources
selected
were
from
a
food
industry
producing
edible
oil
and
textile
woven
fabric.
Reactor
performance
evaluated
by
conventional
parameters
as
well
monitoring
biogas
production
during
co-digestion
both
industrial
equal
mixing
proportions.
Results
indicated
that
these
had
substantial
cumulative
yield
more
than
425
mL/g-VSSfed
whereas
it
about
5-fold
lower
only
for
sludge.
On
other
hand,
chemical
oxygen
demand
(COD)
removal
reached
to
90%
recovery
pH
value
alkalinity
concentration
sufficient
buffering
end
incubation.
Therefore,
combination
through
co-digestion;
higher
digestion
improved
methane
could
be
achieved
due
better
balanced
substrate
nutrients.
Regarding
initial
heavy
metals
supernatant
phase
mixed
sludge;
iron
(Fe),
zinc
(Zn),
nickel
(Ni),
aluminum
(Al),
manganese
(Mn)
removed
56%
80%
while
no
apparent
removals
observed
cadmium
(Cd)
lead
(Pb)
operation.
Hence,
toxic
pollutants
digestate
should
taken
into
consideration
deciding
most
appropriate
resource
ultimate
disposal
methods.
Chemosphere,
Journal Year:
2025,
Volume and Issue:
376, P. 144277 - 144277
Published: March 9, 2025
Sewage
sludges
applied
to
agricultural
soils
are
sources
of
microplastic
pollution,
however,
little
is
known
about
the
accumulation,
persistence,
or
degradation
these
microplastics
over
time.
This
first
study
provide
long-term,
high
temporal
resolution
quantitative
evidence
in
following
sewage
sludge
application.
The
abundance
and
was
assessed
sampled
biennially
from
an
experimental
field
a
25-year
period
managed
under
improved
grassland
regime
application
five
different
sludges.
contained
compositions
reflecting
Microplastic
increased
by
723-1445%
applications
(p
<
0.05)
remained
constant
time
(22
years
possibly
beyond)
>
0.05).
All
predominantly
added
white/transparent
microfibres
soil.
Microfilms,
microfibres,
fragments
were
most
susceptible
degradation,
potentially
creating
micro(nano)plastics.
Of
note
discoloration
coloured
which
may
be
environmentally
hazardous
due
toxicity
textile
dyes
soil
ecosystems.
We
also
found
that
plastic
composition
could
used
trace
its
source.
useful
informing
regulation
on
use
management,
assessing
fate
impact
Soil Use and Management,
Journal Year:
2023,
Volume and Issue:
39(4), P. 1403 - 1421
Published: June 16, 2023
Abstract
Sewage
sludge
treated
with
15%
bentonite,
vermiculite
or
biochar
was
evaluated
as
a
soil
amendment
in
comparison
to
limed
and
untreated
sludge.
Seven
treatments
were
established
two
soils,
an
acid
alkaline,
three
replications,
i.e.
2%
addition
of
vermiculite,
lime
application
sludge,
inorganic
fertilization
no
fertilizers
(control).
Then,
the
used
pot
experiment
perennial
ryegrass
(
Lolium
perenne
L.)
test
plant.
Sludge
clay
minerals
improved
pH
significantly
increased
organic
matter
available
nutrients
both
soils
compared
control.
Although
salinity
sodicity
hazard
evidenced,
initial
alkaline
by
four‐eight
two‐three
times,
respectively,
upon
all
treatments,
especially
that
Moreover,
zinc
(Zn)
times.
Soil
total
aboveground
biomass
yield
133%–171%
72%–88%,
control
enhanced
nutrient
uptake
plants.
Furthermore
microbial
metabolic
quotient
indicated
lack
low
heavy
metal
stress
soil.
After
harvests
ryegrass,
residual
effect
on
salinity,
phosphorus
(P),
Zn
boron
(B)
still
persisted.
Thus
sewage
could
be
applied
at
rate
(≈80
Mg
ha
−1
)
serve
fertilizer
for
grasses
pasture
species;
however,
caution
is
needed
regarding
possible
P
build‐up,
phytotoxicity
salinization
risks.
Chemical Engineering Journal Advances,
Journal Year:
2024,
Volume and Issue:
19, P. 100630 - 100630
Published: July 11, 2024
Municipal
sludge
is
rich
in
nutrients
and
microbial
populations,
making
it
a
potential
soil
amendment
to
enhance
fertility.
This
study
aimed
investigate
the
impact
of
municipal
application
on
populations
assess
its
suitability
as
fertilizer.
The
results
indicated
significant
increase
organic
matter
content
sandy
after
(from
9.57
23.62
mg·kg−1).
Available
potassium
phosphorus
levels
improved
from
poor
intermediate,
available
nitrogen
reached
an
excellent
level.
Plant
parameters
such
wet
weight,
diameter,
root
length,
aboveground
height
also
showed
improvement
with
addition.
High-throughput
sequencing
revealed
Shannon
Simpson
indices
exceeding
5.26
0.98,
respectively,
across
all
substrates
except
B1,
indicating
enhanced
community
structure
diversity
soil.
Redundancy
analysis
highlighted
pivotal
role
total
phosphorus,
matter,
nitrogen,
enriching
abundance
diversity.
In
conclusion,
using
fertilizer
feasible
beneficial
for
safety,
fertility,
enhancement.
