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 in
2nd 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
How the external sensor senses the
light?
!part
LED Fluid Sitting
Channel Lamp
External
(upper)
External
(Lower) Beaker

Process
Processing
Before
After

Result - µPart analysis
Ferric Sulfate Hydrogen
chemical Aniline Blue (g)
Heptaoxide (g) peroxide (g)
Date
0.02 0.51 0.03
21 Jun 07 (1st run)
- 0.3 0.06
21 Jun 07 (2nd run)

Work in progress
•Using solidwork to
draw the box
•Using 3D printer
to make the box
•Using milling
machine to mill the
Amount of chemical adjustment (optimizing)
hold in fluid
channel
Ferric Sulfate Hydrogen
Aniline Blue (g)
Heptahydrate (g) peroxide (g)
0.01 0.26 0.05

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

Project Set Up
Experiment
Procedure
Optimize
Adjust Suitable Collaboration of
the chemicals
Environment equipment
used
Adding more
sensors
Adjust the sensor
network to work
Corporately
Apply the
process into
the real life

Experiment Procedure B
A
Start
Add Aniline
blue (Dye) and
Place the sensor
Weigh out start
holder and check
appropriate monitoring
the LED light is
amount of on
chemicals
Add Ferric
Sulfate
Check that the
Place the water Heptahydrate
base station
pump inside receives signals
Beaker from all sensor
Keep
monitoring for
at least 30
Fill in 1500ml Place the
minutes
water camera on
appropriate
location and
Add Hydrogen
Adjust pH value check that the
Peroxide
to “3” base station
receives image
Install upart Keep
sensor nodes to monitoring the
Switch on the
appropriate color change
sitting Lamp
locations
End
B
A