Page 45 - Commercial Catalogue 2011

This is a SEO version of Commercial Catalogue 2011. Click here to view full version

« Previous Page Table of Contents Next Page »
www.tropicalmarinecentre.co.uk Tel: +44 (0) 1923 284151 Commercial Catalogue 40
Ozone Generation Equipment
Ozone
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
3
), 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.
Safety
• 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
conditions.
• 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
used.
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
p.48