Wetland and constructed wetland for wastewater treatment

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Wetland and constructed

for wastewater treatment

Dr. Le Quoc Tuan

"A generation ago,
wetlands were
considered a nuisance.
They were drained and
filled in, then farmed
or built on.
Today, we know better
than to erase these
valuable ecosystems
from our coastal and
inland landscapes."

Wetlands naturally clean water to help keep
Both the extensive root mass of the plants
and the soil itself work together to extract
contaminants and nutrients from the water.

Sand dunes act as natural soil filters for
contaminants and nutrients found in water that is
ocean bound. Nutrients, such as nitrogen, become
food for microorganisms.

Sand represents just one type of soil filter.
Gravel, brick, and earth also filter soil, while
combinations of these soils can provide more
Natural wetlands and soil filters such as
sand dunes do not have the capacity to clean water
contaminated by humans and industry.
For this purpose, one can learn from nature
and imitate her by building constructed wetlands,
contained soil filters, and other designed
ecosystems for the purpose of purifying human,
agricultural, and industrial wastewater.

Constructed wetland
A system consist of a series of plots filled with
crushed brick, sand, and gravel.
The plots are lined with plastic to prevent waste
from leaching into groundwater, and are populated by
native wetland plants to aid in wastewater treatment.
These constructed wetlands mimic nature by
mechanically filtering, chemically transforming, and
biologically consuming potential pollutants in the
wastewater stream.

Wetland systems are used to remove biological
materials, suspended solids, nutrients, and pathogens
from the wastewater.
The constructed wetland wastewater treatment
system consists of three components: septic tank,
constructed wetland, and land application system.

The schema of designed wetland

Two types of constructed wetlands are shown

Cell 1

Cell 2

The plants grown in these plots are
specifically chosen for their ability to assist in the
biological treatment of water.
Plants act like biological pumps, converting
sunlight into chemical energy and carrying oxygen
from their leaves to their roots.

Pollution eating microbes colonize in the
oxidized zone surrounding the root surface. Microbes
convert nitrates into a harmless gas.
Alternating aerobic and anaerobic environments
work together to remove nitrogen from-wastewater.
Wetland and constructed
Wetland and constructed
for wastewater treatment
for wastewater treatment
Dr. Le Quoc Tuan
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