Author Topic: Ozone: A powerful weapon to combat COVID-19 outbreak  (Read 9156 times)

Damian

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #60 on: April 13, 2020, 06:33:51 AM »
>house/ room tight enough to allow the ozone to build up.
Depends on the ozone output of the machine I think.
We use a 10.000mg/h in a 24 x 18 feet army tent . The ozone machine handles it no problem actually seems like overkill so strong .. I'm sure 5000 mg/h would be more then fine as well.



Rupert

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #61 on: April 13, 2020, 08:32:44 AM »
Damian, is that running it for 2 hours?

i do 2 hours in 15 x 12 x8 ft approx room at 5000mg per hour.

that is  a dose of 1440 cubic feet gets 10,000 mg or approx 7mg per cubic foot or approx 700 mg per cubic meter.

It really sinks. But dissipates OK.
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Damian

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #62 on: April 13, 2020, 09:19:13 AM »
I have to admit I did not do any calculations for correct dosage  .. mostly going by my nose  :-\
I usually do 1 hour running the machine plus a few hours without opening the tent.

Note to self: figure out the proper dosage

nffc

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #63 on: April 13, 2020, 10:53:02 AM »
>Also, is a normal house/ room tight enough to allow the ozone to build up?

Heavier than air I think so should fall nicely and cover.

Brad

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #64 on: April 13, 2020, 11:17:00 AM »
>Also, is a normal house/ room tight enough to allow the ozone to build up?

You want to have all people, plants and pets out of the room you are treating with ozone for several hours after the unit quits running.

Ozone is heavier than air so if you are treating - say a bedroom - 1. you want to put the generator on the tallest furniture in the room,  2. you might want to block the gap underneath the door with a towel depending on how wide that gap is.

Out in my drafty garage, there was no ozone smell after letting it sit overnight.

I treated a bathroom for 1/2 hour and I could smell some ozone on the other side of the closed door. 

rcjordan

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #65 on: April 13, 2020, 02:06:53 PM »
>by nose

I have an 11000 mg/hr machine. Like Damian, I'm just winging it on the calculations but it will absolutely take your breathe away within seconds of starting it. In a 22ft x 24ft x 10ft garage, we place the items directly in the generator's air flow and run it for 30 minutes. Then opening the double garage door dissipates it in about 5 minutes.  Since most items come wrapped or boxed, they usually get a repeat O3 bath after being unpacked.

Originally, I had it set up in a distant bedroom. I couldn't smell it if I stuffed a towel under the door and turned off the HVAC.

The 'vegetable washer' only generates 500 mg/hr. It pumps it out through a rubber tube rather than being fan-driven.  You don't have to run away immediately when you turn that on.  If you bubble it through water, its smell is more tame, but still slightly pungent.  Still, I wouldn't stay in a small, enclosed space with it. We occasionally set it up in the kitchen (open floor plan) or a bathroom downstairs when we go to bed and let it run for an hour to "spot clean."  Even as small as it is, we sometimes get a faint whiff of O3 upstairs. O3 is strong stuff!

https://www.amazon.com/gp/product/B007ZHPRIG
« Last Edit: April 13, 2020, 02:10:32 PM by rcjordan »

Rupert

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #66 on: April 13, 2020, 02:37:09 PM »
Quote
a 22ft x 24ft x 10ft garage, we place the items directly in the generator's air flow and run it for 30 minutes.

Thats 1mg per cubic foot I think.

This is the chap I met with  he has a page on it:

https://ozofreshplugin.co.uk/corona-information/

The following is true to the best of our knowledge in relation to the effectiveness of ozone and how this applies to our products.

    Ozone based products are known to be effective in controlling virus (such as swine flu) and this means it will likely be effective against other strains.
    The amount and method of use must be appropriate for effective application.
    We cannot state (for the reasons above) that our or any ozone product will be totally effective.
    Some ozone products, such as our ProCleanz environmentally friendly surface cleaner have tested to the EN1276 standard which means they are effective against the flu virus H1N1, E-coli, Salmonella and have a 99.9% bacterial kill rate.
    We understand several apparently legitimate sources in China and Thailand are recommending the use of ozone-generating devices such as ours to protect against the coronavirus.
    Ozone products must not be relied upon to eradicate Corona Virus, however, they are known, when used correctly, to be effective against other similar pathogens.


But nothing on dose.
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grnidone

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #67 on: April 13, 2020, 02:57:26 PM »
So, how do you go into the house after treatment to move the machine?

I guess...how dangerous is it to go into the room/ house just to open the window to let it air?

Do you mask up? Or, hold your breath? Or? How many seconds do you have before you risk being harmed?

Rupert

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #68 on: April 13, 2020, 03:20:40 PM »
Leave it a couple of hours. Ozone is unstable.

https://en.wikipedia.org/wiki/Ozone

Quote
It is also unstable at high concentrations, decaying into ordinary oxygen. Its half-life varies with atmospheric conditions such as temperature, humidity, and air movement. Under laboratory conditions, Half-Life Time (HLT) will average ~1500 minutes (25 hours) in still air at room temperature (24C), zero humidity with zero air changes per hour (ACH).[25] As such, in typical office or home environment, where air changes per hour vary between 5 and 8 ACH [26], ozone has a half life of as short as thirty minutes.[27]
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grnidone

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #69 on: April 13, 2020, 03:51:12 PM »
Another question: if it sinks, how do you get it out of a basement?

Brad

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #70 on: April 13, 2020, 03:57:21 PM »
Another question: if it sinks, how do you get it out of a basement?

It just turns to oxygen over time.

Rupert

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #71 on: April 14, 2020, 06:27:35 AM »
Dose.

OK my sums were out a bit there. Trying to convert from m3 to cubic feet mid calc instead of sticking with one or the other. I will go metric to make it easier:

If the room is approx 5m x4m x 2.5m = 50 m3
Machine generates 5000mg per hour and runs for 2 hours = 10,000mg or 10g total ( it degrades so it is less than that but not worked it out yet)

10g/50m3 = 0.2g/m3

Best answer gives a requirement in PPM, so we need to convert the 0 concentration to PPM or parts per million. This is hopefully best answer:
https://www.researchgate.net/post/How_can_we_calculate_ozone_concentration_in_litre_hour

1 g O3/m3 = 467 ppm by volume

My concentration is therefore 93.4 ppm.

Again not sure of the providence of this study, but here is one doing the same calc for SARS:

https://www.ozonetech.com/sites/default/files2/pdf/Ozone_disinfection_of_SARS_Contaminated_Areas.pdf

It talks about the degradation of the O3 and they adjusted the PPM between 0.5 2.5 and 5 PPM I guess by turning on and off the unit. The graph shows the PPM going up and down, so I am guessing that is the on and off.

For air born particles of bacteria 5 PPM kills 90%
 So my does is high.
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Damian

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #72 on: April 14, 2020, 09:06:02 AM »
Thanks Rupert! That helps.

Seems like my dosage is more then enough for me as well.
I looked up the Air Flow Volume in CFM  (Cubic Feet per Minute) output of my machine as it seems needed for a more accurate calculation.
My calculation seems to indicate 2 minutes of running the machine would already be enough to reach 5ppm.

I made a spreadsheet with the formula as I understood it .. if anybody wants to verify my calculations and/or calculate their needs.
Spreadsheet attachments not allowed here so : https://docs.google.com/spreadsheets/d/1ebYMMWAO1YV8nJBea1Eu2y6fSJMhAnmYPwOOCdcMQDE/edit?usp=sharing
The highlighted yellow and orange parts are auto-calculated and the goal should presumably be to to arrive at a concentration of 5 PPM or more.


Rupert

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #73 on: April 14, 2020, 09:35:41 AM »
Even better. :)  Now I am wondering if in 2 mins, the ppm is going to be evenly spread around the room.  The experiment had a fan to help the ozone move about.  If mine is on a chair, and the ozone is heavier than air, then the top half of the room with have a lower density.

so mail left on the floor is OK.  I think I am going to run mine for 20 mins.
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rcjordan

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #74 on: April 14, 2020, 06:45:12 PM »
Looks like the groceries got to her...

NC woman gets COVID-19 despite staying home for three weeks


https://nypost.com/2020/04/13/nc-woman-gets-covid-19-despite-staying-home-for-three-weeks/