FR2965277A1 - Mass production of thermal plankton on culture support disposed within tank, comprises feeding fluid in tank using first river water stream of aqueous fluid for holding culture support immersed in tank, and harvesting thermal plankton - Google Patents

Abstract

The process comprises feeding fluid in a tank (2) using a first river water stream (F1) of aqueous fluid for holding a culture support (5) partially immersed in the tank, harvesting thermal plankton in which collecting plankton is accumulated on the surface of the culture support, subjecting the thermal plankton to a press to remove a portion of the water contained in the thermal plankton, drying the thermal plankton by blowing hot air, and canning the thermal plankton. The first stream of fluid is introduced within the tank by a fluid inlet (3) of the tank at a temperature of 16-18[deg] C. The process comprises feeding fluid in a tank (2) using a first river water stream (F1) of aqueous fluid for holding a culture support (5) partially immersed in the tank, harvesting thermal plankton in which collecting plankton is accumulated on the surface of the culture support, subjecting the thermal plankton to a press to remove a portion of the water contained in the thermal plankton, drying the thermal plankton by blowing hot air, and canning the thermal plankton. The first stream of fluid is introduced within the tank by a fluid inlet (3) of the tank at a temperature of 16-18[deg] C, a flow rate of 0.04-0.06 Ls ->1>and a pH of 5-8, and flows from the inlet towards an outlet (4) of the tank. The culture support is disposed on a path followed by the first stream of aqueous fluid. A second stream (F2) such as source of water stream of aqueous fluid is introduced into the tank using a feeding unit at a temperature of 60-75[deg] C, a flow rate of 0.08-0.2 Ls ->1>and a pH of 9, is directed towards a bottom of the tank to be projected on a surface of the first stream, contacts with the first stream in an impact area, is sulfur aqueous fluid stream containing cyanobacteria and/or sulfobacteria, and has a temperature that is greater than the first stream of aqueous fluid. The impact area is disposed vertically aligned with the culture support. The tank has a predefined maximum filling level. The second stream of aqueous fluid is projected from the feeding unit of which the outlet is spaced from maximum filling level of the tank by a distance of 80 cm. The culture support is mounted and movable within the tank for passing the culture support between an upper position out of water in which the culture support extends above the maximum predefined filling level of the tank and a low position partially immersed in which the culture support extends below the maximum predefined filling level of the tank during the step of harvesting. The culture support is moved from the low position in the direction of the upper position. The plankton is separated from the culture support in upper position. An independent claim is included for an installation for the mass production of thermal plankton.

Description

The present invention relates to a method and an installation for mass production of so-called thermal plankton on at least one culture support disposed inside a basin comprising at least one inlet and one fluid outlet. The so-called thermal plankton, because produced from hot water source generally located near thermal baths is still called glairin.

According to Dr. Pierre de JOYET in 1950, it is defined as a vegetable jelly secreted by bacteria and algae, some of which use sulfur in their metabolism.

In general, the thermal plankton or glairin is formed in particular of floating colonies of algae and bacteria which owe their appearance to the reduction of the mineral sulphates into sulphites, sulphides, hydrogen sulphide and reduced sulfur. The found algae belong to different families, in particular cyanophycées, diatoms, confervées, articulated ... The bacteria found are most often sulfobacteria.

20 The thermal plankton exists naturally at the emergence of hot springs in the mountains or along the rivers of certain regions, such as the Pyrénées Orientales in France. Water, whose origin is numbered several thousand years, is enclosed in an aquifer away from oxygen and light. It contains mostly anaerobic sulfobacteria. This sulfur-containing water (15 grams per liter of free sulfur on average) can emerge from griffins which bring it into contact with oxygen in the ambient air exterminating anaerobic bacteria which are replaced by cyanobacteria and aerobic sulfobacteria. It is at this stage that the natural production of glairins is set up, a complex system containing a set of variable elements (algae, bacteria, diatoms, even nematodes ...).

This thermal plankton is today used in particular in the field of cosmetology and dermatology, particularly because of its antioxidant and anti-inflammatory properties.

So far, the production of this thermal plankton is artisanal. Drilling is carried out at a source of hot sulfur water containing sulphobacteria. The thermal water coming out of the pipes coming from the borehole travels on shelves and progressively the plankton accumulates on the wood in long whitish filaments identical to those which one can meet along the rivers of the Eastern Pyrenees (like Tet) the emergence of hot springs, clinging to the rocks.

In fact, the water escapes from pipes and flows on a smooth plane on which are placed wooden boards immobilized by stones. Little by little, long whitish filaments grow and become entangled and spread out on the water to meet and form a thin layer of biomass. It takes about three weeks to collect the plankton.

The problem of this production process is that it does not make it possible to obtain large and regular amounts of plankton. In addition, the biological results attest to this, there is a certain variability of the plankton as to its color, its odor and the importance of its production according to the date of harvest and the duration of the crop when process is implemented.

An object of the present invention is therefore to provide a plankton mass production method and installation whose designs allow the production of thermal plankton with regular and reproducible characteristics without particular input of chemical inputs or preservatives at the time of the invention. culture.

To this end, the subject of the invention is a method for mass production of thermal plankton on at least one culture support disposed inside a basin comprising at least one inlet and one fluid outlet, characterized in that it comprises at least one fluid supply step of said basin using, on the one hand, a first flow of aqueous fluid, said flow of river water, for maintaining said at least one support at least partially immersed in said basin, this first fluid stream being introduced inside said basin by the fluid inlet and flowing from the inlet to the outlet of said basin, said at least one a culture support being disposed on the trajectory followed by this first stream of aqueous fluid, on the other hand, a second stream of aqueous fluid, said flow of source water, introduced from above, on the inside of the basin, by means of feed means, the said second flow of aqueous fluid x being oriented towards the bottom of the basin to be projected on the surface of said first fluid stream and to come into contact with said first flow of aqueous fluid in at least one zone, referred to as the impact zone, disposed vertically above or at least one culture support, said second aqueous fluid stream being an aqueous sulfur fluid stream containing cyanobacteria and / or sulfobacteria, said second aqueous fluid stream being of higher temperature than the first aqueous fluid stream.

Optimum production of thermal plankton results from the meeting of hot sulfur spring water cascading with cold river water flowing horizontally or gently. The plankton is produced upstream of this meeting point in the immediate vicinity of the turbulence zone created.

The invention therefore consists in feeding the pool with a first flow of aqueous fluid circulating inside the pool from the inlet towards the outlet of the pool, cascading the second stream of aqueous fluid to the surface. The first aqueous fluid stream at a location vertically above the culture support at least partially immersed in said basin of said culture support. This second stream of aqueous fluid contains cyanobacteria and / or aerobic sulfobacteria. Plankton production results from both thermal shock and physical shock between two fluid streams.

The production process comprises a thermal plankton harvesting step during which the accumulated thermal plankton is recovered from the surface of the culture support.

Preferably, after the harvesting step, said thermal plankton is pressed to remove at least a portion of the water contained in said thermal plankton.

Generally, said method comprises, after pressing the thermal plankton, a step of drying said thermal plankton, preferably by blowing hot air. In a particular embodiment of the process, said method comprises, after drying of the thermal plankton, an applertisation step.

Thus, after the harvesting step, the plankton can be used especially in the fresh state, semi-fresh, in the form of powder, or frozen according to the intended application.

The invention further relates to an installation for the mass production of thermal plankton according to a process according to that described above, said installation comprising at least: a basin comprising at least one inlet and one outlet of fluid; a circuit for circulating a first flow of fluid in said basin, said circuit comprising at least one feed pipe in first flow of fluid connectable to the basin inlet and capable of being supplied with fluid from a supply source first fluid flow and a discharge pipe of the first fluid flow of the basin connectable to the outlet of said basin, and means, such as a displacement pump moving the first flow of aqueous fluid from the inlet from the basin towards the outlet of the basin, at least one culture support disposed inside the basin on the path to be followed by said first fluid flow during its circulation between entered e and outlet of the basin, means for supplying a second fluid stream to the interior of the basin, said supply means comprising at least one fluid circulation duct connectable as input to a source of supply in the second fluid flow and opening out at the basin, characterized in that said conduit of said supply means is oriented towards the bottom of the basin to project the second fluid flow to the surface of the first fluid stream, and the outlet of the conduit of the means for supplying the second flow of fluid to the interior of the basin is disposed above and in line with the support 20 for culture.

Of course, and in an equivalent manner, an installation may comprise a plurality of culture supports and several supply means conduits each associated with a culture support. Preferably, said at least one culture support, which has an active support surface on which the thermal plankton produced is intended to accumulate, is a culture support mounted movably between at least two positions, a high position said out water in which the active support surface of said culture support extends predominantly above or in a plane, said filling plane, parallel to the opening plane of the basin, and a low position, said immersed, in wherein the active support surface of said culture support extends predominantly below said filling plane.

As a result of this provision, it is easy to harvest the plankton produced. The filling plane, parallel to the opening plane of the basin, preferably passes through the level corresponding to the maximum filling level of the basin. As a variant, this plane can pass through the level corresponding to the average filling level of the basin when the latter is distinct from the maximum filling level. The culture support may extend transversely or parallel to the flow direction of the first fluid stream.

The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which:

The single figure shows a sectional view of an installation according to the invention in which the outlet of the means for supplying the second flow of aqueous fluid into the basin is disposed above and in line with it. - 20 say vertically of the culture support, this culture support having been shown both in the high position (partially) and in the low position, the passage from one position to another operating by pivotal displacement said culture medium.

As mentioned above, the subject of the invention is a method and an installation for the mass production of thermal plankton on at least one culture support disposed inside a basin 2 comprising at least one inlet 3 and one 4 fluid outlet.

Characteristically according to the invention, said method comprises at least one step of supplying fluid to said tank 2 using, on the one hand, a first stream F1 of an aqueous fluid, said flow of river water for maintaining said at least one culture support 5 in the state at least partially immersed in said pond 2, this first fluid flow F1 being introduced inside said basin 2 by the fluid inlet 3 and flowing from the inlet 3 to outlet 4 of said basin, said at least one culture support 5 being disposed on the path followed by this first stream F1 of aqueous fluid, on the other hand, a second stream F2 of aqueous fluid, said flow of source water, introduced from above, inside the basin 2, by means 8 of supply, said second flow F2 of aqueous fluid being oriented towards the bottom 11 of the basin 2 to be projected on the surface of said first fluid flow F1 and to come into contact with said first F1 first flow of aqueous fluid in at least one zone 14, said impact zone, disposed at the base of the or at least one culture support 5. Said second aqueous fluid stream F2 is a stream of sulfur-containing aqueous fluid containing cyanobacteria and / or sulfobacteria, this second aqueous fluid stream F2 having a temperature greater than that of the first stream F1 of aqueous fluid. As mentioned above, the method can be implemented in a basin containing one or more culture media arranged for example one behind the other on a line connecting the inlet and the outlet of the basin. In this case, generally, the second aqueous fluid stream F2 is projected at several points in said basin, each point corresponding to an impact zone as mentioned above.

The single figure illustrates a solution in which the second fluid stream F2 is projected axially to the surface of the first flow F1 of aqueous fluid. However, preferably, the second fluid flow F2 forms a fluid flow 25 extending in a direction transverse to the flow direction of the first fluid flow F1.

Generally, the process is carried out in the vicinity of a borehole. This drilling allows the extraction of the second aqueous fluid stream F2 which corresponds to a hot sulfur spring water which is enclosed in an aquifer away from oxygen and light. For example, such sources can be found in France in spas, particularly in the Pyrenees, at Molitg-les-Bains or Vernet, in the United States in Yellowstone Park, in Iceland or in New Zealand.

The characteristic of such water sources is, in addition to their high temperature, the presence of sulfur and sulfobacteria and / or cyanobacteria in said water.

The second fluid flow F 2, resulting from this drilling, is generally taken by immersed pump under conditions of maintaining the temperature and the pressure of the dissolved gases.

The method is also preferably implemented in the vicinity of a river whose controlled water is the first flow F1 of aqueous fluid feeding the basin. It is possible to establish a loop circuit between the river 15 and the basin.

The first stream F1 of aqueous fluid, taken from the river, feeds said basin into the inlet, then circulates inside said basin and discharges from said basin through the outlet of said basin before being, for example, rejected at the river. Preferably, said first stream F1 of aqueous fluid is introduced into said basin at a temperature of between 12 and 20 ° C., preferably between 16 and 18 ° C., and the second stream F 2 of aqueous fluid at a temperature of between 50 and 90 ° C, preferably between 60 and 75 ° C. Generally, the first flow F1 of aqueous fluid is introduced into said basin 2 at a flow rate lower than the flow rate of the second fluid flow F 2 inside said basin 2, said flow rates preferably being constant and preferably being included. between 0.04 and 0.06 Ls -1 for the first stream F1 of aqueous fluid and between 0.08 and 0.2 Ls -1 for the second stream F2 of aqueous fluid.

The first stream F1 of aqueous fluid is introduced into said tank 2 at a pH below the pH of the second fluid stream F 2, the pH being of the order of 5 to 8 for the first fluid stream F1 and of the order of 9 for the second stream F2 of aqueous fluid.

The basin 2 having a predefined maximum filling level, the second flow F2 of aqueous fluid is projected from the supply means 8 whose outlet 10 is spaced from the maximum filling level of the pool by a distance of between 0.40. and 1.20 m, preferably about 80 cm.

Generally, the feed means 8 are configured to project a second fluid flow F2 in a direction transverse to the flow direction of the first fluid flow F1. This second fluid flow F2 forms, with the normal to the opening plane of the basin, an angle preferably close to 30 °.

In practice, for the implementation of the method, said installation comprises at least: a basin 2 comprising at least one inlet 3 and a fluid outlet 4, a circulation circuit of a first fluid flow F1 in said basin, said circuit comprising at least one feed pipe F1 in first flow of fluid external to said basin and connectable to the inlet 3 of the basin, a conduit for discharging the first fluid flow F1 from the basin external to said basin and connectable to the outlet 4 said basin 2, and means such as a drive pump moving the first flow F1 of aqueous fluid from the inlet 3 of the basin towards the outlet 4 of the basin 2, at least one culture support 5 disposed to the inside of the basin 2 on the path to be followed by said first fluid flow F1 during its circulation between inlet 3 and outlet 4 of the basin 2, means 8 for supplying a second fluid flow F2 to the fluid inside basin 2, said average ens 8 supply including at least one conduit 9 fluid flow connectable input to a supply source 2965277 second flow of fluid and opening out at the basin 2.

Typically, said at least one, preferably each, of said supply means 8 is oriented toward the bottom 11 of the tank 2 to project the second fluid stream F2 to the surface of the first fluid stream F1. , and the outlet 10 of the or at least one, preferably each conduit 9 means 8 for supplying the second fluid flow F2 inside the basin 2 is disposed above and at the right, c i.e. vertically or vertically or on a culture support.

In the examples shown, the basin being a basin of generally parallelepipedal shape, the inlet 3 and the fluid outlet 4 of said basin are formed in two opposite side walls 12 of the basin. The bottom 11 of said basin may be a horizontal bottom or slightly inclined with a downward slope, preferably less than 5 ° C from the inlet 3 to the outlet 4 of the basin fluid. The basin has a face 13 of the open top, the opening plane of the basin being the plane passing through said opening. This basin has a depth preferably between 5 and 10 cm. For the sake of simplicity of reading of the figures, the first flow feed line F1 of aqueous fluid external to the basin and connected at one end to the inlet 3 of the basin and at its end opposite any source first. F1 flow of aqueous fluid, such as a river or reservoir, to allow feeding F1 first aqueous fluid basin, has not been shown.

Similarly, the discharge pipe of the first F1 flow of fluid external to the basin, and connected at one end to the outlet 4 of the basin and discharging at its other end into the river or into a reservoir, such as the reservoir of feeding said basin, for example to establish a circulation loop between tank and basin, was not represented. ii. The same applies to means, such as a pump, for moving the first stream F1 of aqueous fluid from the inlet 3 towards the outlet 4 of the basin, since they can affect a large number of shapes. to be arranged in a large number of locations and are within the reach of any skilled person with regard to their realization.

Similarly, the borehole for supplying the second stream F2 of aqueous fluid from the basin has not been shown. Only a partial and schematic representation of the supply means which comprise at least one fluid flow duct 9 connectable at the inlet to a source of supply of the second flow F2 of aqueous fluid and having as outlet an outlet disposed above and above or below the culture support 5 was carried out. This circulation duct 9 can extend at said basin in a vertical plane parallel to the flow direction of the first flow F1 of aqueous fluid or in a vertical plane transverse to the flow direction of the first flow F1 of aqueous fluid. Generally, the jet of the second flow of aqueous fluid forms with the normal to the opening plane of the basin an angle close to 30 °.

The basin may comprise an inlet formed of a single opening or a plurality of openings. It is the same with the basin exit. The basin may comprise a single culture support or a plurality of culture support.

Internally, the basin may, for example, be in the form of a channel within which flows the first flow F1 of aqueous fluid from one end to the other of said channel. The installation then comprises a plurality of parallel basins, each basin forming a channel, each channel traversed by a flow F1 of fluid being provided with at least one culture medium and means 10 for supplying the second flow F2 of aqueous fluid inside said channel.

Thus, biomass and plankton accumulated on the surface of each culture medium can be harvested independently of other culture media.

Generally and independently of its design, the or each basin is placed inside a ventilated room, at controlled temperature, kept in the dim light to facilitate the growth of the plankton under good conditions.

Once produced, the plankton must be harvested. During this step, the accumulated thermal plankton 1 is recovered on the surface of the culture support 5.

Generally, the culture support 5 is a culture support mounted movable inside the basin to allow the passage of said culture support 5 between a high position out of water in which said culture support 5 extends mainly to the above the predefined maximum filling level of the basin 2 and a low or at least partially immersed position in which said culture support 5 extends mainly below the predefined maximum filling level of said basin.

In other words, said at least one culture support, which has an active support surface 6 on which the thermal plankton 1 is intended to accumulate, is a culture support 5 mounted movably between at least two positions, a so-called high position out of water in which the active support surface 6 of said culture support 5 extends predominantly above or in a plane, said filling plane, parallel to the opening plane of the basin, and a low position, so-called immersed, in which the active support surface 6 of said culture support 5 extends mainly below said filling plane 30. In particular, in the examples shown, said culture support 5 is pivotally mounted about an axis 7 substantially parallel to the opening plane of the basin. This axis 7 is transverse to the line connecting the inlet and the outlet of the basin. This axis 7 could also have extended substantially parallel to the line connecting the inlet and the outlet of the basin. Generally, the culture support, which preferably has the form of a screen, has a surface 6 of filtering, non-smooth, perforated active support.

The pores of the filter are preferably close to 5 micrometers. The roughness or roughness of the active surface of the culture medium form plankton hooking means.

Preferably, the culture support 5 has an active support surface 6 which forms, inside the basin 2, an inclined surface from a high point near the inlet 3 of the pool to a low point close to the outlet. 4 of the pool 2.

The culture support thus forms a ramp with a downward slope inside the basin taken in the direction of circulation of the first fluid flow. During the harvesting step, said culture support 5 is driven from the lower position towards the upper position and the plankton is separated from said culture support 5 in a raised position.

The post-harvest plankton treatment depends on the desired applications. Thus, as already mentioned above, after the harvesting step, the thermal plankton 1 can be pressed to remove at least a portion of the water contained in said thermal plankton.

At the end of this pressing, it is possible to carry out a step of drying the plankton 1, at a canning stage or at any other treatment stage without departing from the scope of the invention.

Under the conditions as mentioned above, in which the supply line of the second stream of aqueous fluid has a diameter of about 3 cm, the plankton production time is 48 hours. Harvesting can occur every other day.

The plankton obtained is whitish without colonization by unwanted algae. It is possible to obtain 0.15 liter per day of crude plankton for a flow rate of the second flow F2 of aqueous fluid of between 0.1 and 0.2 liters per 10 seconds. This produces regular and good quality plankton production.

Claims (15)

REVENDICATIONS1. Method for the mass production of thermal plankton (1) on at least one culture support (5) arranged inside a basin (2) comprising at least an inlet (3) and a fluid outlet (4) , characterized in that it comprises at least one fluid supply step of said basin (2) using, on the one hand, a first flow (F1) of aqueous fluid, said flow of water of river, for maintaining said at least one culture support (5) in the state at least partially immersed in said pond (2), this first flow (F1) 10 of fluid being introduced inside said basin (2) by the inlet (3) of fluid and flowing from the inlet (3) to the outlet (4) of said basin, said or at least one support (5) of culture being disposed on the path followed by this first flow (F1 ) aqueous fluid, on the other hand, a second flow (F2) of aqueous fluid, said flow of source water, introduced from above, inside the basin (2), 15 help means (8) to bring e, said second stream (F2) of aqueous fluid being oriented towards the bottom (11) of the basin (2) to be projected on the surface of said first stream (F1) of fluid and come into contact with said first stream (F1) aqueous fluid in at least one zone (14), said impact zone, disposed vertically above or at least one culture support (5), said second flow (F2) of aqueous fluid being a flow aqueous sulfur fluid containing cyanobacteria and / or sulfobacteria, the second flow (F2) of aqueous fluid being of higher temperature than the first flow (F1) of aqueous fluid. 2. Production process according to claim 1, characterized in that said first stream (F1) of aqueous fluid is introduced into said basin at a temperature between 12 and 20 ° C, preferably between 16 and 18 ° C, and the second stream (F2) of aqueous fluid at a temperature of between 50 and 90 ° C, preferably between 60 and 75 ° C. 30 3. Production process according to one of the preceding claims, characterized in that the first flow (F1) of aqueous fluid is introduced into said basin (2) at a flow rate lower than the flow rate of the second flow (F2) of Fluid within said basin (2), said flow rates being preferably constant and preferably between 0.04 and 0.06 Ls- 'for the first flow (F1) of aqueous fluid and between 0.08 and 0.2 Ls- 'for the second stream (F2) of aqueous fluid. 4. Production method according to one of the preceding claims, characterized in that introduced into said basin (2) the first stream (F1) of aqueous fluid at a pH below the pH of the second flow (F2) fluid, the pH being of the order of 5 to 8 for the first stream (F1) of fluid and of the order of 9 for the second stream (F2) of aqueous fluid. 5. Production method according to one of the preceding claims, characterized in that the basin (2) having a predefined maximum filling level, the second flow (F2) of aqueous fluid is projected from the means (8) of brought whose outlet (10) is spaced from the maximum filling level of the basin by a distance of between 0.40 and 1.20 m, preferably close to 80 cm. 6. Production process according to one of the preceding claims, characterized in that it comprises a step of harvesting the plankton (1) thermal during which the recovered plankton (1) thermal accumulated on the surface of the support (5). ) of culture. 7. Production method according to claim 6, characterized in that said support (5) of culture being a culture support mounted movably inside said basin to allow the passage of said support (5) of culture between a high position out of water in which said culture support (5) extends predominantly above the predefined maximum filling level of said basin (2) and a low position at least partially immersed in which said culture support (5) extends mostly below the predefined maximum filling level of said basin, during the harvesting step, said support (5) is cultured from the lower position towards the upper position and the plankton is separated from said culture support by high position. 8. Production process according to one of claims 6 and 7, s characterized in that after harvesting step, said plankton (1) thermal is subjected to a pressing to remove at least a portion of the water contained in said plankton (1) thermal. 9. Production method according to claim 8, characterized in that said method comprises, after pressing the plankton (1) thermal, a step of drying said plankton (1) thermal, preferably by blowing hot air. 10. Production process according to claim 9, ls characterized in that said method comprises, after drying of the plankton (1) thermal, an applertisation step. 11. Installation for mass production of thermal plankton according to a method according to one of claims 1 to 10, said installation 20 comprising at least: a basin (2) having at least one inlet (3) and one outlet (4). ) fluid, a flow circuit of a first flow (F1) of fluid in said basin, said circuit comprising at least one supply line (F1) first fluid flow connectable to the inlet (3) of basin and feedable fluid from a supply source in first fluid flow and, a discharge pipe of the first flow (F1) basin fluid connectable to the outlet (4) of said basin (2), and means, such as a driving pump in displacement of the first flow (F1) of aqueous fluid from the inlet (3) of the basin towards the outlet (4) of the basin (2), at least one support (5) culture disposed within the basin (2) on the path to be followed by said first flow (F1 ) of fluid during its circulation between inlet (3) and outlet (4) of the basin (2), - means (8) for supplying a second flow (F2) of fluid inside the basin (2 ), said supply means (8) comprising at least one fluid circulation duct (9) connectable as input to a source of supply of second fluid flow (F2) and discharging at the outlet at the basin (2) , characterized in that said duct (9) of said supply means (8) is oriented towards the bottom (11) of the basin (2) to project the second fluid flow (F2) to the surface of the first flow ( F1) fluid, and in that the outlet (10) of the conduit (9) means (8) for supplying the second flow (F2) of fluid inside the basin (2) is disposed above and plumb or the support (5) of culture. 15 12. Installation according to claim 11, characterized in that said at least one support (5) of culture, which has an active support surface (6) on which the thermal plankton (1) produced is intended to accumulate, is a culture support (5) movably mounted between at least two positions, a so-called high position out of water in which the active support surface (6) of said culture support (5) extends predominantly above or below a plane, said filling plane, parallel to the opening plane of the basin, and a low position, so-called immersed, in which the surface (6) of active support of said support (5) culture extends predominantly below said filling plan. 25 13. Installation according to one of claims 11 and 12, characterized in that said support (5) culture is pivotally mounted about an axis (7) substantially parallel to the opening plane of the basin. 14. Installation according to one of claims 11 to 13, characterized in that the support (5) culture which affects, preferably, the form of a sieve, has a surface (6) active filtering support, not smooth, openwork. 15. Installation according to one of claims 11 to 14, s characterized in that the support (5) culture has an active support surface (6) which forms inside the basin (2) a sloped surface from a high point near the inlet (3) of the basin to a low point adjacent to the outlet (4) of the basin (2).