Chemical Engineering Journal Advances,
Journal Year:
2024,
Volume and Issue:
18, P. 100598 - 100598
Published: March 11, 2024
Water
pollution
is
a
significant
global
environmental
concern
that
threatens
the
sustainable
progress
of
humanity.
In
this
study,
concepts
photocatalytic
oxidation
in
cathodic
zone
(NH4+-N
adsorption-NH3-N
conversion)
and
electrochemical
anodic
direct
+
chlorination)
were
proposed
to
remove
ammoniacal
nitrogen,
experimental
studies
conducted.
The
stirring
test
solution
during
reaction
process
enhanced
nitrogen
removal
efficiency
by
∼9%
after
90
min
reaction.
was
comparatively
high
at
low
concentrations.
After
60
presence
15
mg·L−1
ammonium
chloride,
exceeded
95%;
ionized
ammonia
increased
with
increasing
current
density.
min,
80%.
Under
same
concentration
conditions,
increase
chlorine
ion
concentration,
absence
ions,
environment
insignificant.
power
light
photoelectrochemical
exhibited
∼15%
higher
than
oxidation.
Sustainability,
Journal Year:
2024,
Volume and Issue:
16(19), P. 8635 - 8635
Published: Oct. 5, 2024
The
management
of
domestic
wastewater
in
rural
areas
has
always
been
challenging
due
to
characteristics
such
as
the
wide
distribution
and
dispersion
households.
There
are
numerous
sewage
discharge
methods
used
areas,
it
is
difficult
treat
sewage.
To
address
this
problem,
decentralized
treatment
systems
(DWTSs)
have
installed
around
globe
reuse
recycle
for
non-potable
uses
firefighting,
toilet
flushing,
landscape
irrigation.
This
study
compares
currently
implemented
processes
by
investigating
them
from
point
view
their
performance
advantages
disadvantages
provide
new
ideas
development
technologies.
According
conventional
technologies
including
activated
sludge
(OD,
A/O,
A/A/O,
SBR),
biofilm
(biofilter,
MBBR,
biological
contact
oxidation,
biofluidized
bed)
biogas
digesters,
natural
artificial
wetlands
(surface
flow,
vertical
horizontal
submerged
flow
wetlands),
soil
percolation
(slow,
fast,
subsurface
surface
diffusion)
stabilization
pond
technology
combined
categorized
further
described.
Water,
Journal Year:
2024,
Volume and Issue:
16(13), P. 1901 - 1901
Published: July 3, 2024
Rural
decentralized
domestic
wastewater
treatment
(DDWT)
facilities,
as
an
alternative
to
centralized
sewage
plants,
have
been
rapidly
developed
in
rural
areas
worldwide.
However,
the
lack
of
performance
evaluations
and
operational
status
assessments
these
facilities
poses
a
significant
obstacle
advancements
strategies.
In
present
study,
30
DDWT
with
AO
(anoxic/oxic)
AAO
(anaerobic/anoxic/oxic)
processes
were
investigated.
The
results
revealed
that
only
two
reached
first
A-grade
discharge
standards
China,
twelve
met
B-grade
for
all
ten
quality
indicators.
Low
standard-achieving
ratios
biochemical
oxygen
demand
(BOD5)
(63.3%),
total
nitrogen
(TN)
(60.0%),
ammonia
(NH3-N)
phosphorus
(TP)
(30.0%),
suspended
solids
(SS)
(46.7%),
fecal
coliforms
(FC)
(26.7%)
calculated.
Thus,
it
is
essential
improve
efficiency
BOD5,
TN,
NH3-N,
TP,
SS,
FC
facilities.
addition,
process
had
median
weighted
average
removal
82.02%,
which
was
better
than
(72.48%).
Minor
equipment
failure
rates,
i.e.,
less
20%,
did
not
affect
operation
since
most
backed
up.
Notably,
problems
several
areas,
e.g.,
design,
selection,
construction,
especially
operations,
influencing
should
be
investigated
proactively
addressed.
These
findings
provide
specific
suggestions
improvements
could
benefit
long-term
management
