Soil Mixing on Chemical Oxidation Projects
On most projects a bench test is conducted to
determine the best reagent to address the site
contaminates and the correct reagent-soil ratio to
obtain the required clean-up standards.
After the reagent and ratio have been established in
the lab it is necessary to duplicate the lab procedures
in the field to insure that field results will be
satisfactory.
LTC has developed equipment and procedures that
accurately duplicate, in the field, what was done under
laboratory conditions, ensuring field success.
The Lab Procedure
• The reagents and the site
soil sample are accurately
weighed & the correct
ratio of reagent and soil is
prepared.
• The reagents and soil are
thoroughly blended into a
homogeneous mixture.
LTC Dual Axis Blender
The LTC Dual Axis Blender
Lang Tool Co. developed
the Dual Axis Blender in
order to duplicate lab
mixing. This blender turns
on a vertical axis while the
mixing drums counterrotate on a horizontal axis.
Reagents are delivered
between the rotating
drums to the area of
highest mixing energy.
This powerful blender
produces effective mixing
even in hard clay soils &
is durable enough to stand
up to the harsh job
environment.
The DUAL AXIS BLENDER has the
potential to enable the in-situ treatment of
sites that were previously regarded as
beyond the scope of in-situ treatment and
to substantially reduce the cost of
treatment in undisturbed, hard soil
conditions. When the soil type is hard clay
direct injection doesn’t work because the
additive mixture takes the path of least
resistance. Conventional soil blenders
don’t have enough torque to cut hard clay
at the depths required and often do not
produce a homogenous mixture at these
depths. The usual work plan is to do the
project in lifts. This involves considerable
expense as it requires more equipment
and man power. This method is often
difficult to perform in tight quarters because
it is necessary to have a place to stockpile
the excavated material. In some instances
it also raises concerns that excavating the
material is “transporting hazardous waste”.
CHEMICAL OXIDATION PROJECT
•15’ Treatment depth with extremely hard soil conditions
•290-LTC equipped with the Dual Axis Blender
CHEMICAL OXIDATION PROJECT
Accurate Additive Delivery
Effective mixing is only one of the aspects necessary to duplicate lab
procedures. The reagents must be accurately measured and
delivered in the correct ratio. Lang Tool Co. has developed additional
equipment and procedures to insure successful field results virtually
100% of the time.
The first step is to produce an accurate AutoCAD drawing of the site
treatment area and overlay a cell grid. The cells are designated as in
a spreadsheet with alphabetical columns and numerical rows. A
corresponding spread sheet is developed that lists the reagent
quantities for each cell.
The drawing is loaded into the Dual Axis Blender’s onboard GPS
location system, allowing the operator to see the cell grid, and the
machine and tool location. This information is also broadcasted to a
screen on the LTC Chemical Additive Mixing and Pumping Truck.
AutoCAD Drawing for Oliver Salt Project
Reagent Qty Spreadsheet for Oliver Salt
A
B
C
D
E
F
G
H
I
J
K
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A 818
B 273
O 69
A 818
B 273
O 69
A 818
B 273
O 69
A 818
B 273
O 69
A 1891
B 630
O 160
A 1891
B 630
O 160
A 1891
B 630
O 160
A 1891
B 630
O 160
A 818
B 273
O 69
A 1891
B 630
O 160
A 1891
B 630
O 160
A 818
B 273
O 69
A 818
B 273
O 69
A 818
B 273
O 69
A 818
B 273
O 69
A 818
B 273
O 69
A 818
B 273
O 69
A 818
B 273
O 69
A 536
B 178
O 45
A 536
B 178
O 45
A 818
B 273
O 69
A 818
B 273
O 69
A 536
B 178
O 45
A 536
B 178
O 45
A 148
B 49
O 12
A 536
B 178
O 45
A 536
B 178
O 45
A 536
B 178
O 45
A 536
B 178
O 45
A 148
B 49
O 12
A 148
B 49
O 12
A 536
B 178
O 45
A 536
B 178
O 45
A 536
B 178
O 45
A 536
B 178
O 45
A 148
B 49
O 12
A 148
B 49
O 12
A 536
B 178
O 45
A 536
B 178
O 45
A 536
B 178
O 45
A 148
B 49
O 12
A 148
B 49
O 12
L
A 148
B 49
O 12
A 148
B 49
O 12
A 148
B 49
O 12
A 148
B 49
O 12
A 536
B 178
O 45
A 536
B 178
O 45
A 536
B 178
O 45
A 536
B 178
O 45
A 148
B 49
O 12
A 148
B 49
O 12
A 148
B 49
O 12
M
A 148
B 49
O 12
A 148
B 49
O 12
A 148
B 49
O 12
A 536
B 178
O 45
A 536
B 178
O 45
A 536
B 178
O 45
A 536
B 178
O 45
A 536
B 178
O 45
A 148
B 49
O 12
A 148
B 49
O 12
A 148
B 49
O 12
N
O
P
A 1115
B 370
O 94
A 1115
B 370
O 94
A 1115
B 370
O 94
A 536
B 178
O 45
A 536
B 178
O 45
A 148
B 49
O 12
A 148
B 49
O 12
A 148
B 49
O 12
A 1115
B 370
O 94
A 1115
B 370
O 94
A 1115
B 370
O 94
A 1115
B 370
O 94
A 536
B 178
O 45
A 536
B 178
O 45
A 148
B 49 O
12
A 148
B 49 O
12
A 148
B 49 O
12
A
1115 B
370 O
94
A
1115 B
370 O
94
A
1115 B
370 O
94
A
1115 B
370 O
94
A 536
B 178
O 45
A 148
B 49
O 12
A 148
B 49
O 12
Q
A
1115 B
370 O
94
A
1115 B
370 O
94
R
S
T
GPS Screen View
GPS Screen On Mix Truck
GPS Screen On Truck
LTC Chemical Mix Truck
LTC Mix Truck
The LTC Mix Truck is equipped
with dual 750 gallon solution
tanks. The truck operator
controls the consistency of the
solution and the rate and
quantity of reagent delivery to
the blender. While reagent is
pumped from tank A to the
blender, reagent and water is
mixed in tank B and vice versa.
The dual tank set up allows soil
mixing to continue without
interruption, maximizing
efficiency and reducing project
costs.
Mix Truck Instruments & Controls
The LTC Mix Truck has precise controls for the water and reagents
delivered into the tanks and the reagent solution sent out to the blender.
Dry reagent is vacuum transferred from the onboard scales to the mix
tanks. This is a closed system. The truck operator is not exposed to
reagent dust.
The Additive Mixing Truck is specifically designed to efficiently and
accurately mix, meter, and pump chemical amendments to the soil
mixing equipment. This truck is equipped with two 750 gallon tanks
and two 4’x4’ platform scales. The truck is hooked into the water
supply. The truck has a programmable “IN” meter that shuts the water
off when the entered quantity of water is reached. The reagent is
delivered to the site in plastic 55 gallon drums with four drums to a
pallet. A pallet of reagent is placed on each scale. The vacuum system
is programmable in the same manner as the water system. The quantity
of water to be added to the selected tank is entered into the water
control system and the quantity of reagent to be transferred to the tank
is entered into the vacuum control system. The vacuum transfers the
dry chemical to the tank while water is being introduced. When the
entered quantity of water and reagent is reached the control system
shuts off the vacuum transfer and the water. The tanks have agitators
and the pumps re-circulate the mixture constantly. When the batch is
made the “OUT” meter can be programmed for the cell quantity that is
called for on the spreadsheet. The truck has the capability to transfer
liquid reagent from the scales to the mix tanks with a pneumatic
diaphragm pump. The pump system is programmable in same manner
as the vacuum system.
Each treatment cell is 10’ x 10’. The DAB will begin making a
vertical plunge in one quadrant of a cell. The truck operator will
start to send the reagent solution to the blender. The truck has
instrumentation that shows the rate of reagent delivery and the
quantity of reagent delivered to each cell. The rate of delivery is
adjustable. The truck operator will time the delivery rate to
coincide with the rate of decent of the DAB. The accuracy of this
operation is enhanced by the GPS system. The blender operator
has a split screen showing an aerial view with the machine position
and the cell designation and a side cross-sectional view showing
the tool depth. This same view is broadcast to a screen on the
mix truck so that the truck operator has real time depth
information even if the blender is positioned so that the truck
operator can’t see the blender boom. When the plunge in the first
quadrant is complete the DAB operator will move to the remaining
three quadrants and repeat the procedure. When reagent solution
has been distributed to all four quadrants the DAB operator will
thoroughly mix and homogenize the entire cell.
The truck operator will regulate the flow to coincide with the mixing
rate of the blender. The truck will shut off the flow when the
programmed cell volume is reached. While the solution is being
pumped from the A tank, the B tank will be loaded with water and dry
reagent in the same manner as the A tank was. This process will
continue so that the blender does not have to stop for a batch to be
mixed- while A is unloading B is filling and vice versa. The solution is
pumped through flexible hose to the blender. There is a connection at
the rear of the machine. The plumbing that commences at the rear of
the machine continues over the carbody, up the boom, and to a swivel
connection at the top of the Dual Axis blender attachment. From that
point the plumbing enters the main casing of the Dual Axis blender and
protrudes from the casing near the bottom. This outlet is in the area of
the highest mixing energy. All additive pumping, metering, and
plumbing components are stainless steel, Viton, Teflon, poly, or
EPDM. The system is extremely accurate, insuring that the specified
mixture is delivered to the soil mixer at the desired rate. Accuracy in
delivery reduces the need for retreatment.
The LTC Mix Truck can transfer liquid reagents such as hydrogen
peroxide from the scales to the batch tanks with an air operated
diaphragm pump.
The LTC In Situ Chemical Oxidation system was designed to insure
that our projects will be implemented efficiently and successfully.
High Energy Mixing +Accurate Additive Delivery=
A Successful Project
Columbus, Ohio
Bremerton, Washington
Hayward, California
Ogden, Utah
Easley, South Carolina
Indianapolis, Indiana
THANK YOU
Lang Tool Co.
2520 Glidden Road
Beaverton, MI
48612
Office (989) 435-9864
Cell (989) 280-7006
www.langtool.com