Page 45 - Commercial Catalogue 2011

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Ozone Generation Equipment
Ozone gas is a highly useful addition to any re-circulatory filtration system and although widely used
in marine systems, it also has uses in freshwater applications.
Ozone (O
), consisting of three oxygen atoms, is highly reactive and has many uses:-
• It is highly effective in removing organics, pesticides, dyes and ammonia and nitrites.
• It reverts back to oxygen quickly, leaving no detrimental residues when used correctly.
• It is economical and non-polluting when used correctly.
• It can be used as a sterilising agent to control viruses, bacteria and other pathogens, before, during
and after water is used for re-circulation.
• Ozonisation improves biological and mechanical filtration.
• It can remove biological oxygen demand and raise REDOX potential in the water.
• It can oxidise long chain molecules, which cannot be achieved by biological filtration alone.
• Smaller bubbles can be produced in saltwater than in freshwater.As small bubbles have a higher surface
area to volume ratio than big bubbles, they are more efficient at injecting ozone into the water.
Advice on using Ozone
• Ozone is very unstable. It will revert back to oxygen within about an hour, even if there are no
organics in the water for it to oxidise.
• Use dry air or oxygen to produce ozone. Humidity can reduce ozone production by up to 70%
and can form scale and nitric acid in the generator which will significantly effect its efficiency
Where to apply Ozone
• Ozone should be used in a protein skimmer in marine systems. Ozone gas helps the protein skimming
process, while the vessel allows the capture of the off-gas for venting. Ozone works very well in
gas saturators for freshwater systems.
• CAUTION: Ozone is dangerous and should be used with care. Full Ozone Health & Safety leaflets
are available from TMC - please ask for details.
• Ozone must never be introduced directly into the livestock tank and a suitable reactor should
always be used.
• Ozone should be introduced slowly into the system and monitored carefully to ensure that no
negative effects occur.
• A redox controller should be used which will automatically adjust the ozone generator to changing
• Off-gas from reactors should be directed outdoors or through a suitable ozone destructor device,
such as UV light or activated carbon.
• For ozone generators of 2g/hr or more, it is recommended that an atmospheric ozone monitor is
Ozone should be applied on an individual tank basis at the equivalent of 5-15 mg/hour per 100
litres of volume. In commercial applications, 0.05mg ozone per l/hr of flow is sufficient to achieve
a recommended redox of 250-400mV. (In freshwater you will generally achieve a lower redox of
250-350mV mainly because of the bubble size). A much higher dose rate of 0.2-0.5 mg of ozone per
litre of flow is required to achieve redox levels of 700-800 mV, at which level the water can be
considered sterilised but unfit for livestock without further treatment.
Technical Fact