Liquid purification or separation – With preliminary chemical manufacture
Patent
1996-09-11
1998-12-01
Nessler, Cynthia L.
Liquid purification or separation
With preliminary chemical manufacture
210760, 42218608, 42218611, 42218612, C02F 178, B01D 3100
Patent
active
058433074
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to treatments of water by ozonization and more particularly the development of a principle of a unit for the treatment of water by ozonization including an installation for the production of ozonized fluid.
BACKGROUND OF THE INVENTION
The use of ozone, particularly in water treatment processes, as a bactericidal and virulicidal agent has been known for a long time. This compound is also used in water purification systems during combined ozonization-coagulation, ozonization-flotation, ozonization-adsorption treatment stages on filtering media (with the possibility of biological action on the filter) without forgetting more classic applications such as the removal of iron and manganese or the removal of colour, of tastes and odours from treated waters. Finally it is known that ozone has an oxidising action on a certain number of micro-pollutants (phenols, certain detergents, . . . ) (see B. Langlais, "Nouveau developpement de l'ozonation en eau potable et technologie appropriee", L'eau; l'industrie, les nuisance, n.degree.109, April 1987, pp. 28 to 30).
So as to encourage contact of gaseous ozone with the treated effluent, it is usual to use mixers of various types. These mixers can comprise injection systems such as porous devices, pressure reducing diffusers, emulsifiers (still called filter pumps or hydro-injectors), by static mixers or by dynamic mixers (for example an agitator or a motor driven turbine).
These known mixers are generally situated upstream of contact tanks (contactors) designed in such a way that the oxidising gas is kept in contact with the flow of liquid to be treated for a predetermined period of time.
By way of an example, French patent FR 2662616 describes an installation including, for example, in succession, a transfer device for adding an oxidising gas such as ozone to the liquid to be treated, a module for the forced dissolution of ozone in the liquid and a contactor module. The forced dissolution module described in this document comprises a tank including a first central chamber forming a shaft for the exhaustion of the gases, and a second annular recirculation, chamber coaxial with the exhaust shaft. The two chambers are separated by an internal wall and there is communication between them at their upper and lower parts so that recirculation of the treatment medium is permitted by cyclically passing from one to the other.
These different types of devices have a certain number of disadvantages. Hence in order to ensure a minimum contact necessary time for all of the liquid to be treated, a high mean passage time must be maintained in the reactors. This requires structures which are over-sized, costly and take up a lot of space. Furthermore, they generally do not allow good homogeneity in the distribution of oxidising gas in the treated medium.
The objective of this invention is to provide an installation that allows an ozonized treatment fluid to be supplied that enables optimisation of the contact of the ozone with a liquid to be treated such as water.
Another objective of the invention is to propose such an installation with high output.
Yet another objective of the invention is to provide a water treatment unit equipped with such an installation requiring a reduced volume and optimised for civil engineering.
Another objective of the invention is to provide such a unit allowing the treatment of the water to be maximised and homogenised, particularly with the purpose of allowing its disinfection and the flotation of the organic materials that it contains with the help of the ozonized fluid formed.
Yet another objective of the invention is to provide such a unit with a minimised passage time in the reactors for the liquid to be treated whilst keeping to the minimum contact times.
A particular objective of the invention is to allow the release into the treated water of micro-bubbles of ozone having a size between about 20 microns and 200 microns thanks to the introduction, into the treated medium of a fluid being in the form of o
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Boisdon Vincent
Faivre Michel
Martin Nathalie
Gie Anjou Recherche
Nessler Cynthia L.
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