Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
  • A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
  • A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
  • B03D1/00—Flotation
  • B03D1/02—Froth-flotation processes
  • B03D1/04—Froth-flotation processes by varying ambient atmospheric pressure
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/24—Treatment of water, waste water, or sewage by flotation
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/006—Regulation methods for biological treatment
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/02—Aerobic processes
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
• • C—CHEMISTRY; METALLURGY
  • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
  • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
  • C12M33/00—Means for introduction, transport, positioning, extraction, harvesting, peeling or sampling of biological material in or from the apparatus
• • C—CHEMISTRY; METALLURGY
  • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
  • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
  • C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
  • C12M41/02—Means for regulation, monitoring, measurement or control, e.g. flow regulation of foam
  • C12M41/04—Means for foam enhancement
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
  • B03D1/00—Flotation
  • B03D1/02—Froth-flotation processes
  • B03D1/028—Control and monitoring of flotation processes; computer models therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
  • B03D2203/00—Specified materials treated by the flotation agents; specified applications
  • B03D2203/003—Biotechnological applications, e.g. separation or purification of enzymes, hormones, vitamins, viruses
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
  • C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2201/00—Apparatus for treatment of water, waste water or sewage
  • C02F2201/002—Construction details of the apparatus
  • C02F2201/003—Coaxial constructions, e.g. a cartridge located coaxially within another
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2209/00—Controlling or monitoring parameters in water treatment
  • C02F2209/03—Pressure
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2209/00—Controlling or monitoring parameters in water treatment
  • C02F2209/42—Liquid level
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2301/00—General aspects of water treatment
  • C02F2301/06—Pressure conditions
  • C02F2301/063—Underpressure, vacuum
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2303/00—Specific treatment goals
  • C02F2303/12—Prevention of foaming
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W10/00—Technologies for wastewater treatment
  • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

• the present invention relates to a method and an installation for recovering inert or living microparticles, preferably photosynthetic micro-organisms.
• photosynthetic microorganisms will be used to designate microscopic photosynthetic organisms that may be either undifferentiated or multicellular.
• the present invention will moreover be more particularly described with respect to photosynthetic microorganisms, such as microalgae, without however constituting any limitation thereof.
• photosynthetic micro-organisms when photosynthetic micro-organisms are recovered, the term “harvesting process” will be used.
• inert microparticles will be understood to mean colloids
• Photosynthetic microorganisms are currently mainly grown in open systems, such as lagoons or ponds. More precisely, they
• Photosynthetic micro-organisms thus represent a non-competitive alternative to food crops and, moreover, very interesting thanks to:
• vitamins omega 3, antioxidants, sugars
• the present invention overcomes these drawbacks by proposing a method for recovering inert or living microparticles that is perfectly adapted to the harvesting of photosynthetic microorganisms, such as microalgae, because:
• the process for recovering inert or living microparticles according to the present invention comprises the following steps:
• a polyphasic effluent enriched in inert or living microparticles with respect to the aqueous effluent said multiphase effluent consisting mainly of gases of the gaseous phase which has been possibly modified in its composition by the gaseous exchanges effected in the column,
• gaseous phase consisting of gases of the gaseous phase which has possibly been modified in its composition by the gaseous exchanges effected in the column
• the term "effluent" is used in its most general sense to refer to any fluid emanating from of a polyphasic source, namely consisting of a mixture of liquid, gas and solid elements, the proportion of each of these three states can be very variable.
• step b) of the process according to the invention the expression:
• inert or living microparticles present at concentrations of between 0.1 g / m 3 and 1000 g / m 3 in an aqueous effluent can be recovered.
• concentration of the aqueous effluent in inert or living microparticles will depend on the type of application for which the process is intended.
• the process according to the invention has the advantage of being able to be used in a range of concentrations of living or inert microparticles present in a very wide aqueous effluent, and therefore of being able to be used in very varied technical application areas which are described below.
• the process according to the invention can be operated continuously, it is possible to adapt the recovery rate of the inert or living microparticles present in an aqueous effluent according to the desired energy cost: this depends on the field of application of the invention. process.
• the process according to the invention can be implemented a number of times on the aqueous effluent containing inert or living microparticles so as to increase the recovery rate. said inert or living microparticles.
• the process according to the invention makes it possible to recover inert or living microparticles which can be concentrated between 10 and 30 times, or even between 100 and 1000, relative to those present in the aqueous effluent to which the process is applied.
• the process according to the invention can be used in the field of purification of city water by recovering bacterial streams, colloids, inert residual microparticles such as clays, sludges or silicas, the concentration in microparticles in the effluent a water content of between 5 and 10 g / l.
• the process makes it possible to obtain pure water, after recovery of said microparticles, at a residual concentration in these microparticles of the order of 10 -3 g / l.
• the process according to the invention can be used in off-shore oil exploitation, namely to pre-filter (at 80-90%) the seawater used to flush crude oil into petrogenic source rocks.
• concentration of microparticles in the aqueous effluent is of the order of 0.1 g / m 3 . It may indeed be desired to purge the offshore or coastal seawater of any microparticle greater than the pore of the parent rock, ie of the order of 5 ⁇ .
• This use of the process allows pre-filtration of seawater at low cost, and this before a total filtration by a more expensive and more fragile process such as tangential filtration.
• Another application of the process may be in the field of shellfish hatchery, namely to separate the feeder micro-algae present in the rearing water of such hatcheries, before ultraviolet sterilization. steril is to be transparent). Thanks to this process, the algae thus separated remain alive and can be reinjected into the breeding water circuit once the sterilization is carried out.
• the microparticle concentration of the aqueous effluent can be between 10 g / m 3 and 100 g / m 3 .
• a preferred use of the process according to the invention is the harvesting of micro-algae, the concentration of microalgae in the aqueous effluent being between 100 g / m 3 and 1000 g / m 3 , preferably between 5,000 g / m 3 and 1,000 g / m 3 .
• the process according to the invention makes it possible to obtain concentrated microalgae at a concentration of between 10 and 20 g / l, and thus to concentrate the initial aqueous effluent 20 to 30 times when the concentration of the biomass is order of 0.5 to 1 g of dry matter per liter of culture, or even to concentrate 100 to 1000 times when the concentration of microalgae of the aqueous effluent is lower, namely less than 0.05 g / L.
• an object of the present invention is a process for purifying aquarium water of aquaculture animals which comprises the following steps:
• a rising liquid column under vacuum of an aqueous effluent from a first source is established, said first source being an aquaculture aquaculture pond, in which oxygen is optionally injected, said aqueous effluent comprising faeces, colloids, fine particles such as proteins, and dissolved gases such as ammonia, nitrogen and carbon dioxide, produced by aquaculture animals,
• a polyphasic effluent enriched in faeces, colloids, fine particles, dissolved gases with respect to the aqueous effluent said multiphase effluent consisting mainly of gases of the gas phase which has been possibly modified in its composition by the gaseous exchanges operated in the column,
• a concentrate consisting of a liquid comprising faeces, colloids and fine particles
• a gaseous phase which consists of gases of the gaseous phase which has possibly been modified in its composition by exchanges gaseous gases operated in the column with the dissolved gases of the aqueous effluent
• the injection of oxygen into the predominantly liquid effluent descending into the column has the effect of renewing the oxygen present in the breeding tank of aquaculture animals, and is complementary to the direct injection into the watershed. culture that can also be done.
• a preferred embodiment of the process for purifying aquarium water of aquaculture animals is characterized in that the aqueous effluent also comes from a second source.
• This second source is an agitated bed bacterial filter, in which the nitrogen and possibly carbonaceous discharges produced by the aquaculture animals and coming from the first source are transformed into a particulate biofilm of nitrates which is released in continuous by said agitated bed bacterial filter.
• feces, colloids, fine particles and the liberated bio-film are recovered.
• the process according to the invention is based in particular on the physical principle of adsorption by surface tension of microparticles present in a liquid at the periphery of bubbles created by the injection of a gaseous phase, for example air, into said liquid.
• the method according to the invention is all the more effective by maintaining the depression at the top of the column which allows the regular increase in the diameter of the bubbles created on the bottom side of the column as they migrate. towards the top of the column and thus the formation of a foam at the top of the column. This enhances the intrinsic buoyancy of each bubble. This also allows the use at the bottom of the column of very small bubbles, particularly absorbent for the inert or living microparticles. These will then be found in the foam obtained at the top of the column.
• a gaseous phase is injected generating the smallest possible bubbles, namely of size less than 5 mm, preferably less than 1 mm.
• a finely micronized gaseous phase is injected by a suitable device.
• inert microparticles such as microparticles of petroleum products
• living microparticles such as microalgae that contain oxygen
• surfactants are added to the aqueous effluent, in order to improve the gas / microparticle adsorption inert or living microparticle. They can be recovered by recycling by the foaming or skimming effect that occurs at the top of the column.
• Depression can be instituted by any system of depression.
• the pressure is between 0.3 ⁇ 10 5 and 0.9 ⁇ 10 5 Pa.
• the vacuum is introduced by means of a vacuum pump.
• the height of the column is preferably between 1 and 6 m.
• the length and the time of the contact route of the aqueous effluent with the gaseous phase are much greater than those of conventional baffled skimmers, whose height does not exceed one meter (total length of course not exceeding two meters).
• the length is at least equal to the height of the column and can reach up to 2 to 3 times this height (about 6 to 18 meters) due to phenomena of recirculation of bubbles in the column. This length of course and its duration are essential for all the effects of skimming and gas exchange.
• the gaseous phase injected at the bottom of the column may be air, carbon dioxide or any other suitable gas at overpressure or at atmospheric pressure.
• phase separation of the multiphase effluent in step c) of the process according to the invention can be carried out in a concentration device designed in such a way that:
• the concentrate comprising the inert or living microparticles is evacuated by gravity effect to a collection basin desd ites microparticles, possibly after a passage in a settling chamber, and that
• the gas phase is aspirated.
• the aspiration of the gas phase can be carried out by the same system which introduces depression at the top of the column, such as a vacuum pump.
• the concentration device consists of a scum separator which comprises an anti-foam grid and a weighted float system.
• inert or living microparticles flocculate spontaneously, they can be recovered during step d) of the recovery process according to the invention in the form of a flocculate by any suitable extraction system such as:
• - pumping system for example peristaltic pump
• spontaneous flocculation is understood to mean a spontaneous aggregation of microparticles into larger particles until spontaneous sedimentation.
• inert or living microparticles do not spontaneously flocculate, they can be recovered by any concentration method known to those skilled in the art, such as centrifugation.
• the method according to the invention described above may optionally be completed by at least one step chosen from washing, centrifugation and drying steps.
• the present invention relates to an in situ recovery of inert or living microparticles, preferably a plant for harvesting photosynthetic microorganisms for carrying out the process according to the invention.
• the plant for recovering living or inert microparticles according to the invention comprises:
• an internal tubular enclosure into which enters through a column inlet located on the bottom side of the column and ascendingly, an aqueous effluent comprising living or inert microparticles, and an external tubular enclosure in which a predominantly liquid effluent depleted of living or inert microparticles with respect to the aqueous effluent, and which leaves of the column by a column exit located on the bottom side of the column,
• the outer tube being closed in its upper part above the open upper end of the inner tube leaving a space in which is formed a foam consisting of a polyphasic mixture of the aqueous effluent and the gas phase when setting implementation of the method according to the invention
• iii means for putting the column under vacuum and which ensures the suction of a multiphase effluent enriched with living or inert microparticles with respect to the aqueous effluent and which consists mainly of gases of the gaseous phase that has been modified in its composition by the gaseous exchanges operated in the column,
• the facility for recovering living or inert microparticles also comprises a device for regulating and securing the levels.
• the concentration device of the plant for recovering living or inert microparticles comprises a scum separator.
• the recovery device of the living or inert microparticle recovery installation comprises a settling chamber, a collection basin, a peristaltic pump and a recovery basin.
• the facility for recovering living or inert microparticles comprises a plurality of columns, preferably about sixty, and a single means of putting under vacuum.
• the installation comprises a plurality of columns dimensioned so that the flow rate of the aqueous effluent is equal to 3 to 5 times the flow rate of the gas phase injected.
• the facility for recovering living or inert microparticles according to the invention further comprises as many regulating devices and securing levels as columns.
• FIG. 1 schematically shows a microalgae harvesting plant implementing the method according to the invention.
• This installation comprises a colon 1 which is constituted by two concentric tubes 2,3: a first outer tube 3 and a second inner tube 2.
• the two tubes 2,3 are arranged vertically so as to provide an internal tubular enclosure 22 in which ascendingly flows an aqueous effluent comprising microalgae.
• the aqueous effluent enters through a column inlet 20 located on the bottom side of column 1.
• This column inlet 20 is immersed in a micro-algae culture basin 8.
• Column 1 is not immersed in the microalgae culture basin 8.
• the two tubes 2, 3 also provide an external tubular enclosure 23, in which a predominantly liquid effluent 6 which is depleted of micro-algae with respect to the aqueous effluent 5 and which exits from the column 1 through a downstream flow, flows in a descending manner.
• Column 1 comprises an injection means 4 in the internal tubular enclosure 22 of a gaseous phase consisting of air.
• the outer tube 23 is closed in its upper part above the open upper end of the inner tube 22 so as to provide a space 25 in which is formed a shield 7 which consists of a multiphase mixture of the aqueous effluent 5 and the gaseous phase during the implementation of the process according to the invention,
• the aqueous effluent 5 is withdrawn from a storage facility, for example a microalgae culture basin, using mechanical means to be conveyed at the column inlet of column 1.
• the predominantly liquid effluent 6 depleted of micro-algae out of the column outlet 21 of said column 1 can be reintroduced into this storage facility, possibly using another mechanical means In this case, the installation function do not continuously.
• the micro-algae contained in the predominantly liquid effluent 6 depleted in micro-algae are reintroduced into the storage facility to be withdrawn again from the storage facility and conveyed to the inlet 20. column 1.
• the predominantly liquid effluent 6 discharged from the outlet 21 is introduced into another storage unit.
• the column 1, as well as the column 20 and column outlet 21 are immersed in a basin that contains inert or living microparticles to recover.
• the vacuum means 9 of the column 1 consists of a vacuum pump, the pressure is set at about 0.4 bar.
• the installation shown in FIG. 1 comprises a concentration device 34 which comprises a scum separator 10,
• the multiphase effluent resulting from the separation at the top of column 1 of the scum 7 is conveyed to the scum separator 10 via a pipe 24.
• the scum separator 10 is in the form of a collection tank 36 which comprises an anti-foam grid 26 and a weighted float 27.
• the foam separator 10 is designed so that as the multiphase effluent is injected into the collection tank 36, the phase separation of step c) of the process according to the invention is carried out thanks to the vertical movement of the weighted float 27.
• the foam separator 10 is connected to the vacuum pump 9 by a pipe 33.
• the gaseous phase which consists of the gases of the gaseous phase, which has been possibly modified in its composition by the gaseous exchanges operated in column 1, is sucked towards the vacuum pump 9 through the pipe 33.
• the gaseous phase thus sucked can pass through a bubbling chamber (not shown in Figure 1) so as to protect the vacuum pump 9.
• the concentration device 34 furthermore comprises a motorized valve 13
• the microalgae recovery device comprises:
• the microalgae recovery installation shown in FIG. 1 further comprises a device for regulating and securing the levels 28.
• This regulation and level 28 security device consists of a chamber 29 having the shape of a cylinder. approximately 7 cm in diameter and 10 cm in height, disposed facing the level with the desired level of scum 7 that it is desired to impose on column 1.
• the chamber 29 is connected:
• a first connection means 30 such as a flexible tubule (for example with a section that can be between 0.5 and 3.5 cm),
• connection means 31 such as a semi-rigid tube
• the chamber 29 further comprises two level sensors 1 1, 32:
• the first sensor 1 1 is connected to a d ispositif dud control check of the multiphase effluent enriched in microparticles inert or living compared to the effl uent aqueous (not shown in Figure 1) .
• the second sensor 32 is connected to a device for controlling the flow rate of the gas phase injected at the bottom of column 1 (not shown in FIG. 1).
• the aforementioned flow control devices consist of solenoid valves.
• the level of the air / water interface of the chamber 29 is below the aforementioned lower limit, this means that the multiphase effluent is not extracted at the top of column 1, but on the contrary it is it of the predominantly liquid effluent 6 which is extracted; which is significant of a malfunction of the installation according to the invention. If the level of the air / water interface of the chamber 29 is below the aforementioned lower limit, this means that the multiphase effluent is not extracted at the top of the column, but that it is air which is sucked up the column; which is also significant of a malfunction of the installation according to the invention.
• the regulating device 28 described above makes it possible to ensure the proper operation of the installation according to the invention.
• the flow rates of the multiphase effluent and the gas phase injected at the bottom of the column can be regulated so that the multiphase effluent is well extracted at the top of the column.
• column by means of the vacuum means 9 which establishes the vacuum throughout the installation according to the invention, and not that the predominantly liquid effluent 6 depleted in inert or living microparticles is extracted at the top of the column; which would risk damaging the vacuum means 9 by drowning.
• the installation comprises a plurality of columns 1, for example sixty in number, whose column and column outlet entries 21 are immersed in basins. 8.
• the columns 1 are not immersed in the culture tanks 8.
• the columns 1 are put under vacuum by means of a single means of vacuum 9.
• the vacuum instituted by the vacuum underpressure means 9 is centralized, which ensures the resilience of the installation in the event of failure at one of the columns 1.
• the facility for recovering living or inert microparticles according to the invention further comprises as many regulation and level 28 security devices as columns 1.
• a separate level regulating and securing device 28 is connected to each of the columns 1 and as described above.
• the species of microalgae extracted were the following:
• the actual volume to be collected per kg of microalgae means the volume of microalgae concentrate obtained at the end of step c) of the recovery process according to the invention.
• EC is the concentration factor, the definition of which is: concentration of the concentrate in microalgae (expressed in g of dry matter / L of culture) divided by the concentration of the culture to be harvested (expressed in g of dry matter IL of culture).
• the extraction cost is expressed in euros / kg.
• the very low cost of extraction of microalgae thanks to the recovery method and to a microalgae recovery plant according to the present invention compared to the microalgae extraction costs which have been published.
• the present invention is thus particularly advantageous for harvesting microalgae.
• Table 2 presents a comparison of different parameters such as amortization, energy, labor and overall cost of microalgae extraction using different techniques such as:
• microalgae recovery device is particularly advantageous from an economic point of view compared to other known microalgae recovery techniques and implemented. Indeed, thanks to the recovery process and the recovery device according to the present invention, there is a significant reduction in microalgae extraction costs.
• the present invention thus makes it possible to overcome a crucial technological problem represented by the harvesting of microalgae during the cultivation of microalgae. It proposes a microalgae recovery process quite economical compared to the known microalgae harvesting techniques. Which is quite advantageous in the process of microalgae cultivation.

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• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Microbiology (AREA)
• Zoology (AREA)
• Environmental & Geological Engineering (AREA)
• Water Supply & Treatment (AREA)
• Hydrology & Water Resources (AREA)
• Biodiversity & Conservation Biology (AREA)
• Wood Science & Technology (AREA)
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• Botany (AREA)
• Micro-Organisms Or Cultivation Processes Thereof (AREA)
• Farming Of Fish And Shellfish (AREA)

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• 2009
  • 2009-11-09 FR FR0957898A patent/FR2952370B1/fr active Active
• 2010
  • 2010-11-09 EP EP10792985A patent/EP2499100A1/fr not_active Withdrawn
  • 2010-11-09 WO PCT/FR2010/052401 patent/WO2011055101A1/fr active Application Filing
  • 2010-11-09 AU AU2010316844A patent/AU2010316844A1/en not_active Abandoned
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• 2012
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