Using A Wireless Sensor Network to
monitor Fenton!s Reaction for Water
Purification
Mid Term Presentation
Yuen, Wan-Choi Rainbow
Supervisor: Dr. Kim Lau
Overview of My project
! Topic:
" Monitoring Fenton!s reaction by using a
wireless sensor network
! Color of the solution changes from dark to clear
! Application:
" In-house Water purification system
Fenton!s Reaction! Chemicals used:
! Ferric Sulfate Heptahydrate (Catalyst) – Fe2SO4 +7H2O
! Hydrogen Peroxide (Reactant) – H2O2
! Aniline Blue (Dye – Pollutant)
! pH value should be around 3-4 to keep the reaction
work! Fe2+ + H2O2 # Fe(OH)3
! Reaction equation:! Fe2+ + H2O2 # Fe3+ .OH + OH-
! Fe3+ + H2O2 # Fe2+ + OOH_ + H+
" Fe2+ is the catalyst, Fe3+ can be used as the catalyst
too, therefore, no need to add extra Ferric Sulfate in2nd run
" .OH (Hydroxyl Radical) is the chemical which oxidizes
any Pollutants in water
Experimental equipment set-up:
How the sensor senses the light?
How the Internal sensor
senses the light
LED Fluid
Channel
!part
How the external sensor senses the
light?
External
(upper)
External
(Lower) Beaker
Sitting
Lamp
Process
Before
Processing
After
Result - µPart analysis
chemicalDate
Ferric SulfateHeptaoxide (g)
Hydrogenperoxide (g)
Aniline Blue (g)
21 Jun 07 (1st run) 0.02 0.51 0.03
21 Jun 07 (2nd run) - 0.3 0.06
Work in progress
Amount of chemical adjustment (optimizing)
Ferric SulfateHeptahydrate (g)
Hydrogenperoxide (g)
Aniline Blue (g)
0.01 0.26 0.05
•Using solidwork to
draw the box
•Using 3D printer
to make the box
•Using milling
machine to mill the
hold in fluid
channel
Future Work
! Investigate issues with a larger sensor
network
" Implement 7 sensor nodes
" Radio interference
" Node range (< 30m in-house)
! Apply to larger sample (fish tank)
! Transfer of the sensor network from the
lab to real-life applications
ProjectProcedure
Adjust Suitable
Environment
Optimize
the chemicals
used
Set Up
Experiment
Collaboration of
equipment
Adding more
sensors
Adjust the sensor
network to work
Corporately
Apply the
process into
the real life
Weigh out appropriate
amount of chemicals
Switch on the
sitting Lamp
Place the
camera on
appropriate
location and
check that the
base station
receives image
Experiment ProcedureStart
Place the water
pump inside
Beaker
Install upart
sensor nodes to
appropriate
locations
Adjust pH value
to “3”
Fill in 1500ml
water
A
A
Place the sensor
holder and check
the LED light is
on
Check that the
base station
receives signals
from all sensor
B
B
Add Aniline
blue (Dye) and
start
monitoring
Add Ferric
Sulfate
Heptahydrate
Keep
monitoring for
at least 30
minutes
Add Hydrogen
Peroxide
Keep
monitoring the
color change
End
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