north fork maquoketa denitrifying bioreactor installation
DESCRIPTION
In July of 2011, a denitrifying bioreactor was installed in the North Fork Maquoketa Headwaters watershed in northeast Iowa. A denitrifying bioreactor is installed to reduce nitrate delivery from agriculture fields.TRANSCRIPT
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The bioreactor was designed by ISU Extension and
installed by Schlietz Construction and Ernie Goebel
With funding from the:
Iowa Watershed Improvement Review Board
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Nitrate in
tile-drainageDenitrifying
bioreactorwith by-pass flow
Reduced nitrate
loading to surface waters
nitrate
+ organic fill
bacteria nitrogen
gas
Tile-drained field
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The site for the
Denitrifying Bioreactor
was chosen because it
was in an out-of-the-
way area beside a
grassed waterway
along Clear Creek Rd.
Tile location --
outlets under
the road
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Starting the carbon biomass (woodchip) bed. This will
be a 15’ wide, 100’ long, and about 3.5’ to 4’ deep
with a 1.25 % grade from the inlet to the outlet.
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Bypass tile line --
Due to location
of existing tile a
non-perforated
bypass
line was placed
within the
bioreactor.
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Inlet control structure with two sets of baffles.
To Bioreactor inlet tile
Water from
drainage
tile
Bypass
Leave 1.5 to 2 ft at bottom Remove all baffles
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Outlet structure
plumbed with a
perforated tile at
lower end of
bioreactor.
Water will exit the
bioreactor through
perforated tile.
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Outlet control structure to allow water
samples to be taken and, if desired, reduce
the rate of flow from bioreactor.
Outlet From bioreactor
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Non-perforated by-pass line tied in below outlet structure.
Outlet control
structure used to
allow water samples
to be collected or
to slow the rate of
flow out of
bioreactor.
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Biomass ‘bed’ was filled
using a skid loader and
spread with backhoe to
prevent wheel traffic and compaction on the
wood chips.
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Inlet perforated tile–
where water will
enter evenly across
the bioreactor.
Inlet control structure – Tile water allowed
to freely flow from drainage tile into bioreactor. Internal baffles used to
create 1.5’ to 2’ head pressure before
releasing into bypass non-perforated tile.
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Permeable geotextile fabric used to
keep soil from leaching down into the
wood chips and slowing the system.
Outlet
Inlet
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Soil placed
back over
wood chips with
care not to put
too much
wheel traffic on
chip bed.
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Bioreactor mounded to reduce chances of
washout. Waterway will be shaped and
reseeded. The goal is to have 1 to 1.5 Ft of
soil covering wood chips.