A serious look at ozone

[Zealious]

Good day.

In light of increasingly inexpensive and powerfull ozone generators on eBay I have been taking a serious look into using ozone.

lets look at the facts.

Ozone has been used in dozens of industries for many years to improve sanitation of surfaces and piping, raw water purification, air treatment and odor control, wastewater treatment, and much more. Being one of the world's most powerful oxidants, ozone is capable of accomplishing these tasks efficiently while leaving no residuals. Having the ability to eradicate an extensive list of viruses and bacteria, ozone has proven itself to be the most beneficial green technology available.

If ozone is used in the right absorbtion rates or away from people its totally safe

ozone attacks odor molecules.

I rented a house that smelled terribly of cigarette smoke. Only thing that got rid of the smell was a couple days of ozone treatment. Ive seen ozone work first hand.



they use ozone in hospitals and to sanitize water.

SOOOOo

I need some help. Ive been looking over all the formulas to calculate the amount of ozone for a specific space and I need a little help.

been a cpl months now since I last looked at it so I don't know where the formulas are but I will find them for everyone.

The thing to figure out is the area of the space. The size of the ozone generator. the amount and length of time to run ozone safely... in my situation I pump all my grow exhausts into my attic. So Im trying to figure out how to treat that area. Plus I figure if I slightly botch the numbers and don't meet the safe ozone levels it won't matter since its in the attic.

 

[Zealious]

Ozone Conversions & Equations

Physical Properties, Standard conditions P = 101325 Pa, T = 273.3 K
Density of ozone: 2.14 kg/m3
Molecular weight of ozone: 48
Density of oxygen: 1.43 kg/m3
Molecular weight of oxygen: 32
Density of air: 1.29 kg/m3
Density of water: 1,000 kg/m3
Useful Conversion Factors: (for water)
1,000 liters = 1 m3 = 264 US gallons
1 gal = 3.785 liters = 3,785 ml
1 m3= 35.3 ft3 = 264 US Gallons
Ozone Concentration in Water
1 mg/l = 1 PPM O3 = 1 g O3/m3 water {By weight}
Ozone Concentration in Air By Volume
1 g O3 / m3 = 467 PPM O3
1 PPM O3 = 2.14 mg O3/m3
100 pphm (parts per hundred million) = 1 ppm (parts per million)
Ozone Concentration in Air by Weight
100 g O3/m3 = 7.8% O3 (Approximate)
1% O3 = 12.8 g O3/m3 (Approximate)
1% O3 = 7,284 PPM Ozone
Ozone Concentration in Oxygen by Weight
100 g O3/m3 = 6.99% O3 (Approximate)
1% O3 = 14.3 g O3/m3 (Approximate)
1% O3 = 6,520 PPM Ozone
Adjust Flow Rate Conversion
adjusted flowrate for pressuri
Determining Ozone Dosage in Water
The formula is actually very simple.

It is water flowrate x ozone dosage = required ozone production

UNITS CONSISTENCY IS VERY IMPORTANT

Below is the formula for determining ozone generation requirements if you know common water and ozone parameters (namely flowrate in GPM and ozone dosage in mg/l).

flowrate (GPM) x 3.75 l/gal x 60 min/hr x ozone dosage (mg/l) = ozone production (mg/hr)
Lets work through an example. How much ozone production is needed to dose 2 PPM into 20 GPM of water? (we will be using PPM throughout the rest of this example knowing that 1 mg/l = 1 PPM)

20 GPM x 3.75 l/gal x 60 min/hr x 2 PPM = 9,084 mg/hr (9 gm/hr)

Remember that 9 gm/hr will permit you to dose the water with 2 PPM of ozone. This does not mean that 2 PPM will be your final dissolved ozone concentration. Due to efficiency losses with injecting ozone and ozone demand of the water, your dissolved ozone concentration will be less.

Determine the output of an ozone generator
the formula is flowrate (lpm) x ozone concentration (g/m3) = ozone production (mg/hr)

Let's work through an example: The ozone concentration exiting an ozone generator is 120 g/m3 at 5 lpm of oxygen flow. What is the output?

5 l/min x 120 g/m3 x (1 m3/1,000 l) = 0.60 g/min

g/min are not normal units in the ozone industry so we simply convert minutes to hours to get g/hr: 0.60 g/min x 60 min/hr = 36 g/hr

Sample Conversions
Convert 140 g/m3 to wt% (oxygen feedgas).

based on the conversion above, 100 g/m3 = 6.99 wt. %

therefore 140 g/m3 / 100 g/m3 x 6.99 wt. % = 9.8 wt.%

http://www.ozonesolutions.com/info/ozone-formulas

 

[Zealious]

g/hr is what we need. and most of the above is for water. but the bottom part applies.

not sure about feed gas. or flowrate. the eBay units usually have an AC muffin fan.

Thinking about saving some money and just buying the DIY kit. I can use any fan I have lying around.

I know flow rate needs to be kind of slow and steady over the the ozone coil for it to work best kind of like carbon .longer the contact with the carbon the more absorption.

 

[growshopfrank]

A mixing chamber in the ducting downstream from the ozone source is a near necessity.
The chamber can be as simple as a wood box with a couple of baffle boards to create turbulence this helps the ozone mix with the smelly air so the ozone can do its job.
Try to picture the inside of a car muffler, that sort of deal.
My main beef with using ozone like this is that ozone generators can and do fail completely leaving the grow exhausting tell tail odor's that depending on the situation can be life altering while charcoal filters fail slowly giving a gardener plenty or warning.