EFFECT OF 0 -100 ppm of CH4 ON

POWER EFFICIENCYTesting the efficiency of ozone by using different levels of N2 and CH4

Levels of N2 – 1.00, 0.75, 0.50, 0.25, 0.00 %

By: Flordeliza Lingat

Ozone Generated in the LabOzone Generated in the Lab *Photo courtesy of Dr. Frielich*Photo courtesy of Dr. Frielich

Generation of OzoneGeneration of Ozone

Cold plasma discharges– Dielectric layer covers metal electrode– Relatively low temperature and high pressure

Important factor for discharge because limits discharge current between metal electrode and it distributes microdischarges over entire electrode area

Ionization occurs in discharge gap and charge accumulates on the dielectric

– When voltage is applied, microdischarges are induced– Electric discharges causes oxygen to undergo chemical

reactions induced by the initial electron impact that causes ion formation and dissociation of the various discharge species

– Humidity influences electric properties of microdischarges. - Dr. Jose Lopez

Cylindrical DBD - diagram courtesy of Dr. Lopez

The Dielectric Barrier Discharge Tube

Kinetics of Ozone Formation

In pure oxygen, which is used in most commercial ionizers, O3 formation is a straightforward process. O3 always originates from a three body reaction of an atom reacting with two O2 molecules where O3 stands for a transient excited state in which the O3 molecule is initially formed. The time scale for O3 formation in atmospheric-pressure oxygen is a few microseconds.

It has been seen that there is greater ozone efficiency where there are less impurities in

the system.

The experiment is still in progress and the spectrograph will be used to take more accurate data.

Experimental Setup and Schematics

Top view of the two experimental units and schematics of the setup.

Plasma ReactorPlasma Reactor

SpectrometerSpectrometer

Gratingz

Fiber opticFiber optic

PMT/CCD

Computer/Computer/RecorderRecorder

Plasma

Typical Schematic Design of a Water Treatment Plant That Uses Ozone

Biomedical Advantages- from Viviana Alvitres

Inactivation of BacteriaInactivation of Bacteria Blood coagulationBlood coagulation Sterilization and healing of Sterilization and healing of

wounds wounds Treatment of living tissuesTreatment of living tissues Treatment of damage skinTreatment of damage skin

Inactivation of Bacteria by Ozone Inactivation of Bacteria by Ozone

- from Catherine Flores - from Catherine Flores

Attacks numerous cellular constituentsAttacks numerous cellular constituents Acid-fast bacteria Acid-fast bacteria Gram-positive bacteria vs. Gram-negative bacteriaGram-positive bacteria vs. Gram-negative bacteria

Ozone and Oxidation

Ozone is an oxidantOzone is an oxidant– Oxidative stressOxidative stress– Reducing environmentReducing environment– Toxic effectsToxic effects

Ozone and Microplasma

The technology of ozone generation is an open field and many new products had surfaced. One company TMEIC had claimed to have developed the industry’s highest yielding ozone at a concentration of 400 mg/m3 and does not use nitrogen gas (Japan,2007)

The use of microplasma to generate ozone has expanded from industry, to medicine, to dental science. Microplasma stamps are used to cover dental cavities.

Thank you Dr. Clayton, Dr. Lopez, Dr. Frielich,Dr. Zhu, John Ruppert, Dr. Valencia, all guest

speakers and Fr. O’ Brien

Thanks to Catherine Flores,Viviana Alvitres, Angellica Ceballos, SPC staff,

PARSE FELLOWS