Method for recovering inert or living microparticles and use and installation of same
AssigneesInstitut Francais De Recherche Pour L'exploitation De La Mer (Ifremer), Institut National Des Sciences Appliquees
InventorsJean-Yves Champagne, Francois Rene
Life of this patent
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Abstract
A method for recovering inert or living microparticles in which a rising liquid column is set up under negative pressure of an aqueous effluent that includes inert or living microparticles, and a foam is separated at the top of the column into a multiphase effluent enriched with inert or living microparticles relative to the aqueous effluent and into a mostly liquid effluent depleted of inert or living microparticles relative to the aqueous effluent. The invention also concerns the different applications of this method and an installation implementing this method.
Claims20
A method for recovering inert or living microparticles, comprising the following steps:
- a rising liquid column under negative pressure is formed of an aqueous effluent comprising inert or living microparticles,
- a gas phase is injected into the bottom side of the column, the said gas phase being distributed within the column in the form of bubbles;
- and
- negative pressure is set up on the top side of the column,
- so that the bubbles increase in diameter as they migrate towards the top of the column and so as to obtain, on the top side of the column, a foam consisting of a multiphase mixture of aqueous effluent and gas phase;
- the foam at the top of the column is separated into:
- a multiphase effluent enriched with inert or living microparticles relative to the aqueous effluent, the said multiphase effluent mostly consisting of gases of the gas phase whose composition may have been modified through gas exchanges occurring in the column, a mostly liquid effluent depleted of inert or living microparticles relative to the aqueous effluent and moving down the column,
- the inert or living microparticles contained in the multiphase effluent are concentrated by separating the phases of the said multiphase effluent into:
- a concentrate consisting of a liquid comprising the inert or living microparticles,
- a gas phase consisting of gases of the gas phase whose composition may have been modified through gas exchanges occurring in the column,
- d) the inert or living microparticles are recovered by means of a flocculation step followed by a sedimentation step.
A method for treating the water of aquaculture organism rearing ponds which comprises the following steps:
- forming a rising liquid column under negative pressure of an aqueous effluent derived from a first source, said first source being an aquaculture organism rearing pond into which oxygen is optionally injected, the said aqueous effluent comprising faeces, colloids, fine particles such as proteins, and dissolved gases such as ammonia, nitrogen gas and carbon dioxide produced by the aquaculture organisms,
- infecting into the bottom side of the column a gas phase consisting of air and optionally ozone, the said gas phase being distributed within the column in the form of bubbles, and
- setting up a negative pressure on the top side of the column,
- so that the bubbles increase in diameter as they migrate towards the top of the column, and so as to obtain on the top side of the column a foam consisting of a multiphase mixture of aqueous effluent and the gas phase,
- the foam at the top of the column is separated into:
- a multiphase effluent enriched with faeces, colloids, fine particles, dissolved gases relative to the aqueous effluent, the said multiphase effluent mostly consisting of gases of the gas phase whose composition may have been modified through gas exchanges occurring in the column,
- a mostly liquid effluent moving down the column which is depleted of faeces, colloids and dissolved gases compared with the aqueous effluent, and into which oxygen is optionally injected;
- the faeces, colloids, fine particles contained in the multiphase effluent are concentrated by separation of the phases of the said multiphase effluent into:
- a concentrate consisting of a liquid comprising faeces, colloids, the fine particles,
- a gas phase which consists of the gases of the gas phase whose composition may have been modified through gas exchanges occurring in the column with the gases dissolved in the aqueous effluent,
- the faeces, colloids, fine particles are recovered.
Dependencies are inferred from the claim text.