Grinberga
L.
The
Efficiency
and
Solutions
for
Water
Quality
Improvement
in
Constructed
Wetlands
Latvia:
dissertation
to
receive
scientiffic
doctoral
degree
(Ph.
D.).
Jelgava,
Latvia
University
of
Life
Sciences
Technologies,
2022.
118
p,
72
pictures,
6
tables,
96
inform.
souces.
prepared
by
Linda
“The
Latvia”
is
based
on
the
topicality
examine
environmentally
oriented
nature-based
biological
method
water
quality
improvement.
wetlands
are
well
known
different
countries
include
widely
used
treatment,
but
haven`t
been
proved
as
surely
effective.
wastewater
treatment
physical,
biochemical
processes
doesn’t
require
electricity.
first
chapter
provides
an
overview
possibilities
using
constructed
treating
types
wastewater.
Various
constructive
solutions
provided
according
conditions
needs
Latvia.
research
data
from
two
objects
study
site
Mezaciruli,
were
separate
designed,
built
operated,
one
monitoring
object
with
wetland
Zante.
All
information
sites,
methods
described
second
dissertation.
In
results
discussion
efficiency
nutrient
removal
sites
analysed
impact
climate,
maintenance
investigated.
average
reduction
concentrations
ammonia
nitrogen,
nitrate
nitrogen
total
was
observed
17%,
67%
54%,
respectively,
subsurface
flow
wetland.
During
period
surface
Mezaciruli
reduced
10%,
24%
9%,
respectively.
median
compounds
showed
increase
orthophosphate
phosphorous
phosphorus
72%
wetland,
decreases
5%
27%
no
changes
suspended
solids
62%
at
11%
8%
value
oxygen
demand
chemical
decreased
91%
83%,
Based
during
this
methodology
calculations
dimensions
has
approbated
a
calculation
algorithm
model
developed.
aim
empirical
observations
approbate
technical
develop
dimensioning
order
reduce
pollution
caused
economic
activities.
Research
objectives
1.
To
evaluate
application
design
origin,
composition
volume
various
wastewaters.
2.
determine
analyse
pollutants
including
compounds,
solids,
after
3.
pollutant
considering
most
significant
geographical
physical
influencing
factors
4.
apply
tool
improve
types,
content
hypotheses
Properly
designed
dimensioned
reducing
or
several
water.
Key
words:
quality.
European Journal of Soil Science,
Journal Year:
2021,
Volume and Issue:
72(5), P. 2165 - 2179
Published: Feb. 3, 2021
Abstract
Return
of
crop
straw
and
its
biochar
to
the
agricultural
field
decreases
pressure
on
phosphorus
(P)
resources
reduces
leaching
P
runoff.
We
conducted
a
5‐year
trial
from
2013
2017
study
capability
maize
retain
soil
P,
which
was
quantified
by
investigating
distribution
fractions
in
profile
(0–100
cm)
aggregates
different
grain
sizes.
The
impact
treatments
with
nitrogen‐phosphorus‐potassium
(NPK)
fertiliser
alone
or
combined
were
examined.
found
that
increased
aggregate
stability,
showed
an
increase
mean
weight
diameter,
geometric
diameter
>
250
μm.
Maize
promoted
both
inorganic
(dicalcium
phosphate
dehydrate
[Ca
2
‐P],
octocalcium
8
aluminium
[Al‐P],
iron
[Fe‐P],
hydroxyapatite
10
occluded
[O‐P])
organic
(labile
phosphorus,
LOP,
moderately
labile
MLOP)
accumulation
stabilization
aggregates,
especially
small
macroaggregates
250–2000
Total
(TP),
Ca
‐P,
Fe‐P,
MLOP,
resistant
(MROP)
highly
(HROP)
enhanced
biochar,
whereas
‐P
O‐P
decreased
0–20‐cm
topsoil.
measured
TP,
40–100‐cm
layer
following
deposition,
higher
Al‐P,
MROP
HROP
obtained
straw‐supplemented
relative
NPK
treatment
20–100‐cm
layer.
Thus,
can
be
used
effectively
improve
structure
support
retention
has
potential
reduce
profile.
Highlights
improved
Inorganic
mainly
accumulated
macroaggregate
fraction
Biochar
