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