Liquid purification or separation – Processes – Chemical treatment
Reexamination Certificate
1999-11-09
2001-05-15
Simmons, David A. (Department: 1724)
Liquid purification or separation
Processes
Chemical treatment
C210S765000, C210S167050, C210S192000, C210S194000, C210S205000, C210S539000
Reexamination Certificate
active
06231769
ABSTRACT:
BACKGROUND OF THE INVENTION
(i) Field of the Invention
The present invention relates to an installation for producing ozonized water, of the type comprising a circuit for producing ozonized water comprising a water inlet, an ozone-injection inlet for injecting ozone taken from an ozone source, a contactor for bringing the ozone into contact with the water, and a section for utilizing the ozonized water arranged downstream of the contactor.
Such installations are used, in particular, in order to produce ozonized water for washing fish or shellfish.
(ii) Description of the Related Art
In known installations, the contactors comprise a water-filled vessel in which ozone is bubbled in order to dilute some of the ozone gas in the water.
However, only a small proportion of the ozone passing through the water is actually dissolved, so that a large part of the ozone passes through the volume of water then escapes through an opening made in the upper part of the vessel. The residual ozone is thus discharged by releasing it to the atmosphere.
In order to avoid the pollution due to such releases of ozone, a filter comprising oxidizing agents is often provided at the discharge outlet for the ozone in order to convert the latter into oxygen before it is released.
Because of the large amount of ozone released into the atmosphere, and the frequent need to treat it, such installations have a high running cost.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the invention is to provide an installation for producing ozonized water whose running cost is reduced and which minimizes the losses of ozone into the atmosphere.
To that end, the invention relates to an installation for producing ozonized water of the aforementioned type, characterized in that it comprises means for collecting undissolved ozone, arranged downstream of the contactor, and in that the outlet of the collection means is connected to the circuit for producing ozonized water upstream of the contactor.
According to particular embodiments, the installation may comprise one or more of the following characteristics:
it comprises means for joining the outlet of the collection means to the outlet of the ozone source upstream of the ozone-injection inlet provided on the circuit for producing ozonized water;
the ozone-injection inlet comprises a water pump for injecting ozone gas into the water circulating in the circuit for producing ozonized water;
it comprises a mass-flow regulator at the outlet of the ozone source;
the collection means comprise a settling compartment;
it comprises, downstream of the means for collecting the undissolved ozone, a calibrated vent which discharges a determined amount of the gas collected;
the contactor comprises a coil;
the circuit for producing the ozonized water is closed in a loop, and the section for utilizing the ozonized water comprises an ozonized-water circulation outlet, which outlet is connected to the water inlet of the circuit for producing ozonized water;
the ozonized-water circulation loop comprises a circulating pump;
the said section for utilizing the ozonized water comprises a tap for drawing off ozonized water; and
the section for utilizing the ozonized water comprises a machine for producing ozonized ice, comprising a water compartment for manufacturing ice, and the compartment is connected in series with the ozonized-water circulation loop.
The invention will be understood more clearly on reading the following description which is given solely by way of example and with reference to the single figure.
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patent: 5578280 (1996-11-01), Kazi et al.
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patent: 5843307 (1998-12-01), Faivre et al.
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Gammal Boris
Pean Jean-Louis
Burns Doane Swecker & Mathis L.L.P.
Hoey Betsey Morrison
l'Air Liquide, Societe Anonyme pour l'Etude et l'
Simmons David A.
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