Author Topic: Ozone: A powerful weapon to combat COVID-19 outbreak  (Read 5251 times)

nffc

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #75 on: April 14, 2020, 07:05:11 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/

Either the groceries or kissing someone she shouldn't.

Damian

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #76 on: April 15, 2020, 07:50:39 AM »
5 ppm might be too low to kill viruses.

The document and experiment mentioned earlier in this thread went to 200 ppm for 120 minutes (for a bioclean room)
https://www.ncbi.nlm.nih.gov/pubmed/23538847

Appearently air humidity is also important.. 80% and up is good.

Here they seem satisfied with 20-25 ppm

Development of a Practical Method for Using Ozone Gas as a Virus Decontaminating Agent
https://www.tandfonline.com/doi/full/10.1080/01919510902747969
« Last Edit: April 15, 2020, 09:08:42 AM by Damian »

Rupert

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #77 on: April 15, 2020, 10:14:35 AM »
mmm, OK so my 20 mins is now looking low.  An hour should do it, but I think I will go back to the 2 hours on the basis that it has a half life of 30 mins....
Actually it might never get high enough.....

Need to calc the Cmax, wow thats beyond my maths grade....
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rcjordan

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #78 on: May 19, 2020, 09:24:53 PM »
I'm going to post this, but it feels sketchy...

Ozone Therapy Proving Successful In Covid-19 Patients | The Ibizan
https://theibizan.com/ozone-therapy-proving-successful-in-covid-19-patients/

ergophobe

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #79 on: May 20, 2020, 06:04:38 PM »
half life of 30 mins....

That is highly dependent on conditions. At -50C in a closed chamber with no contaminants, it is over a month. At 100C it's just a few minutes. Also affected by humidity, the number of organics and oxidative (right word) materials it comes in touch with.

I think to do it right if you want it as a primary defense, you need to get a meter. That ensures that the levels get high enough and ensures they get low enough before your re-enter the space. The only downside is the meters are way more expensive than the generators. About $400 for a basic one. I'm winging it for now and thinking of it as an "extra" not a "primary" measure. But if I find that months down the line I'm still using it, I might invest in a meter.

The general rule seems to be that you should not enter a room until concentration falls below 0.02ppm and that takes about an hour if you disinfect to a 0.5ppm to 5ppm level.

A 30-minute run at that level resulted in
 - 72% reduction in airborne bacteria at a 0.5ppm level
 - 93% reduction at 2.5ppm
 - 90% reduction after 30 mins at a 5ppm level, showing there isn't a lot of benefit past a certain point, partly because in the real world most rooms cannot be fully sealed during the process.

That's not a 30-minute run time on the machine. That's keeping the machine on for 30 minutes after the concentration reaches a given level and then waiting until it falls to a safe level to enter the room.

Viruses are supposedly more susceptible to ozone than bacteria, so the idea is that the virus reduction would be the same or better.
https://www.ozonetech.com/sites/default/files2/pdf/Ozone_disinfection_of_SARS_Contaminated_Areas.pdf


Some studies have found that even at concentrations of 100ppm to 1000ppm, it is difficult to get significant biocidal action, especially on porous materials. Unfortunately, on the abstract of that study seems to be available for free
https://www.tandfonline.com/doi/abs/10.1080/01919510903043772
« Last Edit: May 20, 2020, 11:11:47 PM by ergophobe »

Rupert

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #80 on: May 20, 2020, 07:53:18 PM »
Ergo,  Very good points.

However dont  you only need a meter if you are using it in an unheated room?

Otherwise just work on room temperature, and provided you are sure you over saturate, its fine I think .
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rcjordan

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #81 on: May 20, 2020, 09:36:02 PM »
>meter

You guys buy it and I'll borrow it.

https://www.amazon.com/dp/B07BFK3PQS

ergophobe

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #82 on: May 20, 2020, 11:10:46 PM »
However dont  you only need a meter if you are using it in an unheated room?

I don't need a meter at all until RC buys one and lets me borrow it.

I think you *need* a meter if you are selling disinfection services and are making a business of it.

I'm not 100% sure how I'll use them yet, but my plan is to let the run longer than I think I need and then let them sit idle longer than I think I need. It would be nice to have a meter just once or twice to calibrate.

I'm also thinking of using one in the sauna which, in that small space, should get it to a concentration to kill mildew. I really like that idea, because I don't like the idea of cleaning the sauna with chemicals that absorb into the wood and then volatilize when thing heats up.

Rupert

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #83 on: May 21, 2020, 06:44:59 AM »
Do you think these work?
https://www.a1-cbiss.com/gas18l.html

I agree, it would be nice to calibrate... This stuff stinks.

I think your best bet is as you say, borrow RCs ;)


Or Added:
https://www.ebay.co.uk/i/202172094494

Build a detector... at 16, add it to a PI
« Last Edit: May 21, 2020, 06:47:50 AM by Rupert »
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rcjordan

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #84 on: May 21, 2020, 12:33:19 PM »
>these work?

Yes. Good find.  I'd never heard of them but a quick search finds them offered by well-known industrial supply houses like Grainger.

The question, though, is are they single-use?  Here they are for $8 each.

Draeger Gas Detector Tubes (10 per box) - Ozone (O3)
https://www.gasdetectionwarehouse.com/draeger-gas-detector-tubes-10-per-box-ozone-o3/

<+>
Phooey! Requires a pump.

Sensidyne Colorimetric Gas Detector Tubes | Sensidyne
https://www.sensidyne.com/colorimetric-gas-detector-tubes/

Phooey2!  Single use.

How Do Gas Detector Tubes Work? | Zefon International
https://www.zefon.com/gas-detector-tube-uses


« Last Edit: May 21, 2020, 12:44:10 PM by rcjordan »

Rupert

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #85 on: May 21, 2020, 01:28:11 PM »
Eeek.. those pumps aren't cheap.  not so good find then :)  What about the electronics?  Would something like that go on a PI do you think?

Or Arduino
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rcjordan

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #86 on: May 21, 2020, 02:18:10 PM »
>electronics

That might be a contender.  Here it is on Amz;

Amazon.com: SainSmart MQ131 Ozone Gas Detection Sensor Module: Toys & Games
https://www.amazon.com/SainSmart-MQ131-Detection-Sensor-Module/dp/B00KBX08L2

Too bad I don't have a clue about connecting pi or arduino.


<+>
No good. Chips are not calibrated.
« Last Edit: May 21, 2020, 02:45:50 PM by rcjordan »

gm66

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #87 on: May 21, 2020, 06:04:43 PM »
I can help with arduino stuff, i've used gas sensors before with them.
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rcjordan

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #88 on: May 21, 2020, 06:56:47 PM »
Let me talk with Xi Jinping and see what his minions might have available on the cheap.

gm66

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Re: Ozone: A powerful weapon to combat COVID-19 outbreak
« Reply #89 on: May 23, 2020, 12:35:19 AM »
Let me talk with Xi Jinping and see what his minions might have available on the cheap.

If he's too pricey i have some connections in Shenzhen ;+}

But seriously though, i've made small CO2 sensor nets with Unos, the code is simple as is the wiring, you can master/slave them to make polling easy. Noone needs my help, anyone here could learn it in half an hour even without coding or electronics experience.
Civilisation is a race between disaster and education ...