ozone disinfection
QUESTION:
I recently read an article by Dr. Walter
Blogoslawski titled "Ozone
treatment of seawater to control vibriosis in mariculture of penaeid
shrimp, Penaeus vannamei". Dr. Blogoslawski used
residual levels of ozone (range 0.066-0.25 ppm; mean 0.07 ppm) in
larval rearing tanks to reduce bacterial levels, promote moulting and
improve survival.
In our hatchery for Jasus edwardsii (rock lobsters) I have been using
ozone to sterilise water, however, prior to the water returning to the
rearing tanks it is degassed, UV filtered and passed through an activated
carbon filter to remove any ozone residuals.
Is anybody using a similar strategy to Dr. Blogoslawski of
maintaining low ozone levels in their rearing water to improve
production?
Craig
***************
COMMENTS 1:
Likewise, anyone using ozone in seawater for complete
sterilization and viral inactivation? Any info out there for ozonation
to this degree would be greatly appreciated. We are actually looking
to ozonate effluent for complete viral inactivation.
Michael H. Schwarz
Aquaculture Specialist
Virginia Polytechnic Institute
Seafood Research and Extension
102 S. King Street
Hampton, VA 23669 USA
Phone: 1-757-727-4861
Fax: 1-757-727-4871
email: mschwarz@vt.edu
***************
COMMENTS
2:
We
are treating all the sea water intake for our marine recirculation system
with ozone to keep out bacteria, algae, parasites of all kinds etc. The
daily intake is 60 cbm and this flow is treated by 2 foam fractioner (Type
Aquacare, Germany). We measure the ozone treatment by measurement of ORP in
the fractioner outlets. It is necessary to provide enough ozone to get to
> 500mV better even higher for total desinfection. These are levels, that
are used in the soft drink industry for flushing the bottles before
refilling. Up to now it seems to work but - frankly speaking - we have no
idea on the influence on viruses.
e-mail: butt.fischfarm@t-online.de
www.ecomares.de