Eco-Environment & Health,
Journal Year:
2024,
Volume and Issue:
3(3), P. 271 - 280
Published: Feb. 27, 2024
Freshwater
salinization
is
receiving
increasing
global
attention
due
to
its
profound
influence
on
nitrogen
cycling
in
aquatic
ecosystems
and
the
accessibility
of
water
resources.
However,
a
comprehensive
understanding
changes
river
impacts
salinity
arid
semi-arid
regions
China
currently
lacking.
A
meta-analysis
was
first
conducted
based
previous
investigations
found
an
intensification
that
altered
hydrochemical
characteristics.
To
further
analyze
impact
metabolism
processes,
we
evaluated
rivers
with
long-term
gradients
situ
observations.
The
genes
enzymes
were
inhibited
generally
by
salinity,
especially
those
involved
fixation
nitrification,
showed
low
abundances
three
levels.
abundance
denitrification
dissimilatory
nitrate
reduction
ammonium
functions
still
maintained
high
proportion,
for
genes/enzymes
enriched
under
medium
salinity.
Denitrifying
bacteria
exhibited
various
relationships
while
bacterium
(such
as
Sustainability,
Journal Year:
2023,
Volume and Issue:
15(3), P. 1799 - 1799
Published: Jan. 17, 2023
In
order
to
satisfy
the
requirements
of
rural
domestic
sewage,
a
bio-ecological
combination
system
was
proposed,
including
biological
treatment
section
(anaerobic
hydrolysis
tank
and
aerobic
tank)
an
ecological
post-treatment
section.
This
study
observed
application
potential
constructed
wetlands
(CW)
on
different
operation
modes
for
biologically
pre-treated
wastewater.
The
organics
nutrient
removal
efficiency
tidal
flow
wetland
(TFCW)
horizontal
subsurface
(HFCW)
were
compared
at
temperature
range
20–40
°C.
During
stable
phase,
higher
chemical
oxygen
demand
(COD),
ammonia
nitrogen
(NH4+-N),
total
phosphorus
(TP)
efficiencies
existed
in
TFCW
than
HFCW,
corresponding
COD
69.46%,
NH4+-N
96.47%,
TP
57.38%,
but
lower
performance
(61.43%),
(84.99%),
(46.75%)
which
should
be
attributed
increasement
heterotrophic
bacteria
(Arthrobact
Sphingomonas),
nitrifiers
(Nitrospira),
phosphate
accumulating
organisms
(PAOs)
(Pseudomonas).
microbial
biomass
also
increased
from
2.13
±
0.14
mg/g
4.64
0.18
(TFCW),
proved
strengthen
formation
growth
biofilm
under
better
supplement.
Based
relative
abundance
functional
genera
community,
it
showed
that
more
favorable
promoting
bacteria,
nitrifiers,
phosphate-accumulating
(PAOs).
When
changed
−4
°C
15
°C,
two-stage
(TFCW-HFCW
HFCW-TFCW)
used
improving
pollutants
removal.
results
demonstrated
effluent
concentrations
TFCW-HFCW
HFCW-TFCW
met
Class
1A
discharge
standard
DB32/3462-2020
JiangSu
Province,
China.
Therefore,
this
will
provide
useful
easy-to-implement
technology
as
Journal of Cleaner Production,
Journal Year:
2024,
Volume and Issue:
462, P. 142696 - 142696
Published: May 27, 2024
This
study
examined
the
adsorption
capacity
and
treatment
efficiency
of
sand
filters
in
on-site
systems
for
cold
climate
regions.
The
effects
different
operating
conditions,
porosity
kinetics
parameters
were
investigated
column
experiments
COMSOL
Multiphysics®
modelling,
to
comprehensively
reveal
mechanisms
optimize
nitrogen
(N)
phosphorus
(P)
removal
a
field
tidal
flow
constructed
wetland
(TFCW),
treating
effluent
from
package
plant
with
P
filter
material.
results
showed
that
Total-P
rate
was
dependent
on
feed
water
quality
(Septic
tank
>0.77
±
0.06
g
kg-1;
Biotreatment
>0.41
0.07
Reactive
material
Polonite®
<0.18
kg-1).
In
TFCW
trial,
top
layer
(>1.42
0.55
g/kg)
middle
(>1.06
0.51
twice
laboratory
columns,
due
strong
interaction
air-water
interface
use
fluctuated
domestic
wastewater
solutions.
breakthrough
curve
(BTCs)
coarse
matched
physical
behaviour
tracer
electrical
conductivity
(EC)
experiments.
modelling
demonstrated
high
low
hydraulic
load
significant
factors
optimal
NH4-N,
Total-N,
PO4-P,
Total-
(>99.95
0.03
%,
44.37
28.75%,
70.89
28.30%,
76.18
20.3%),
(>98.94
1.77%,
18.23
23.04%,
76.62
28.73%,
65.40
31.85%)
deep
(>99.99
0.02%,
65.50
20.64%,
75.53
23.16%,
41.54
28.81%)
system,
respectively.
show
can
be
applied
as
technology
polish
three-step
pretreatment
system.
However,
optimization
is
an
important
factor
design
receive
successful
long-term
Eco-Environment & Health,
Journal Year:
2024,
Volume and Issue:
3(3), P. 271 - 280
Published: Feb. 27, 2024
Freshwater
salinization
is
receiving
increasing
global
attention
due
to
its
profound
influence
on
nitrogen
cycling
in
aquatic
ecosystems
and
the
accessibility
of
water
resources.
However,
a
comprehensive
understanding
changes
river
impacts
salinity
arid
semi-arid
regions
China
currently
lacking.
A
meta-analysis
was
first
conducted
based
previous
investigations
found
an
intensification
that
altered
hydrochemical
characteristics.
To
further
analyze
impact
metabolism
processes,
we
evaluated
rivers
with
long-term
gradients
situ
observations.
The
genes
enzymes
were
inhibited
generally
by
salinity,
especially
those
involved
fixation
nitrification,
showed
low
abundances
three
levels.
abundance
denitrification
dissimilatory
nitrate
reduction
ammonium
functions
still
maintained
high
proportion,
for
genes/enzymes
enriched
under
medium
salinity.
Denitrifying
bacteria
exhibited
various
relationships
while
bacterium
(such
as
