Is anyone studying the effect of ozone oxidizing naturally occurring
bromide into bromine? Is there residual bromine in the fish?
>
Greg Scher
CW2, US Army Veterinary Corp
----- Original Message -----
From: Aquatfs@aol.com
Date: Wednesday, January 11, 2006 10:05 am
Subject: Re: Ozone & chlorine as sanitizers
> I would like to clarify several issues concerning the use of ozone
> as a
> sanitizer. Ozone generators are rated to produce an amount of
> ozone gas per hour
> or per day. This gas must then be efficiently mixed with water in
> order to
> produce ozonated water. Using a coarse sparging stone for example
> will probably
> result in most of the ozone bubbling through the water and then
> outgassing
> before being of any use. The potential for ozone in water to kill
> bacteria has
> the same constraints as chlorine. There is a difference between
> free chlorine
> (chlorine that has not reacted with organic matter and is
> effective at
> killing bacteria) and total chlorine which includes free and
> bound chlorine (the
> latter being chlorine that has reacted with organic matter and is
> not
> effective at killing bacteria).
>
> There must be sufficient ozone or chlorine to overcome the organic
> demand
> and still have a residual. Obviously this is a function of how
> much sanitizer is
> being added and the demand that is imposed by the amount of
> organic material
> in the water. If someone states that they are adding 3-5 ppm of
> ozone, the
> first question is whether this is calculated as the amount of
> ozone being
> produced by the generator divided by the amount of water. Was the
> assumption that
> 100% of the gas would be dissolved in the water as this is never
> the case.
> There are test methods and instruments for measuring the net
> residual in
> ozonated water although there are some difficulties in getting
> good measurements
> especially at lower concentrations.
>
> The next problem involves the organic load in the contacting
> vessel for
> ozonated water and the product. Ozone will react quickly with
> organic matter
> before it kills bacteria. If the amount of ozone available is less
> than or equal
> to the amount that will react with the organic load, then little
> or no
> sanitizing effect is possible. And finally, contact time is a
> consideration for any
> sanitizer.
>
> Alan Ismond, P.Eng.
> Aqua-Terra Consultants
>
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