Water Environment Research,
Journal Year:
2024,
Volume and Issue:
96(2)
Published: Feb. 1, 2024
Abstract
In
the
present
study,
magnetic
coagulation
was
used
to
treat
dredged
water
and
response
surface
method
optimize
process
parameters.
The
dissolved
organic
matter
(DOM)
removal
characteristics
were
characterized
by
three‐dimensional
fluorescence
spectrometry
ultra‐high
resolution
mass
spectrometry.
During
process,
suspended
solids
(SS)
rate
increased
initially
then
decreased
under
conditions
of
increasing
powder
dosage
stirring
rate.
After
precipitation
for
20
min,
contents
SS,
ammonia
nitrogen,
chemical
oxygen
demand,
total
phosphorus
in
treated
met
requirements
discharge
standard
(GB8978–1996,
China).
Three‐dimensional
results
showed
that
selectively
removed
fulvic
acids
humic
acid
substances.
with
10
min
relative
content
lignins,
tannins,
proteins,
lipids,
aminosugars,
unsaturated
hydrocarbons,
condensed
aromatic
structures,
carbohydrates
26.3%
39.4%,
respectively.
coagulation,
distribution
range
small
molecule
DOM
shifted
low
H/C
high
O/C
regions.
This
study
provides
a
novel
perspective
studies
on
coagulation.
Practitioner
Points
SS
significantly
enhanced
use
efficiency
affected
dosage.
Magnetic
regions
after
Environment International,
Journal Year:
2023,
Volume and Issue:
173, P. 107813 - 107813
Published: Feb. 11, 2023
Recovering
high-value
biomaterials
from
anaerobic
digestion
sludge
(ADS)
has
attracted
considerable
attention.
However,
the
molecular
features
and
biological
effects
of
abundant
dissolved
organic
matters
(DOMs)
in
ADS
are
still
unclear,
which
limits
efficient
recycling
application
these
bioproducts.
This
study
investigated
composition
transformation
DOMs
recovered
through
a
mild-temperature
alkali-hydrothermal
treatment
(AHT)
with
ultrahigh-resolution
mass
spectrometry
energy
spectroscopy,
fertilizing
were
evaluated
by
rice
hydroponics.
The
results
indicated
that
AHT
processes
significantly
promoted
solubilization
release
ADS,
where
most
molecules
remained
unchanged
mainly
consisted
N-containing
compounds
1-3
N
atoms,
featuring
aromatic
or
N-heterocyclic
rings.
Furthermore,
at
pH
9-10
induced
hydrolysis
partial
protein-like
substances
DOMs,
was
accompanied
formation
heterocyclic-N
compounds.
Under
11-12,
increasingly
decomposed
into
amino-N
containing
1
5
while
numerous
oxygenated
phytotoxicity
degraded
removed
DOMs.
Rice
hydroponic
test
verified
ADS-derived
process
12
exhibited
highest
bioactivity
for
growth,
attributed
to
abundance
amino
humic
substances.
proposed
novel
recovery
high-quality
liquid
fertilizer
process,
can
further
enrich
technical
options
available
safe
utilization
resources.
ACS ES&T Water,
Journal Year:
2024,
Volume and Issue:
4(9), P. 4228 - 4238
Published: Aug. 16, 2024
The
compounds
generated
during
wastewater
treatment
processes
might
increase
the
complexity
and
chemical
risk
assessment
of
wastewater-derived
dissolved
organic
matter
(DOM)
released
into
receiving
water.
This
study
applied
Fourier
transform
ion
cyclotron
resonance
mass
spectrometry
to
investigate
dynamic
changes
in
composition
at
molecular
level
a
full-scale
municipal
plant
(WWTP).
Approximately
63.1%
detected
molecules
effluent
were
derived
from
influent.
N/S-containing
more
effectively
removed
than
CHO
studied
WWTP.
dealkylation
oxygen
addition
reactions
N-containing
molecules,
along
with
predominant
N-addition
observed
anaerobic
oxic
tanks,
contributed
higher
N/Cwa
However,
S-containing
could
be
via
S-loss
anoxic/anaerobic/oxic
(inverted
A/A/O)
processes.
Dealkylation
found
reaction
types
all
tanks
inverted
A/A/O
More
oxidized
aromaticity
unsaturation
degree
Our
findings
provide
comprehensive
view
transformation
DOM
WWTP
offer
valuable
insights
water
quality.
