EP3728546A1 - Photobioreacteur - Google Patents
PhotobioreacteurInfo
- Publication number
- EP3728546A1 EP3728546A1 EP18826007.9A EP18826007A EP3728546A1 EP 3728546 A1 EP3728546 A1 EP 3728546A1 EP 18826007 A EP18826007 A EP 18826007A EP 3728546 A1 EP3728546 A1 EP 3728546A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- photobioreactor
- channel
- fluid
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/02—Photobioreactors
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- 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
- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
- C12M29/06—Nozzles; Sprayers; Spargers; Diffusers
- C12M29/08—Air lift
Definitions
- the invention lies in the field of photobioreactors.
- the invention relates to a photobioreactor of intensive production, adapted to avoid a reduction of light diffusion to the algal solution disposed in the photobioreactor.
- Micro-algae-type photosynthetic microorganisms tend to dominate many application sectors. Photosynthetic microorganisms are thus used for the solar production of bioenergies, the production of natural molecules of interest or even the pollution control of gaseous effluents (for example C0 2 from fumes) or liquids with the associated production of a plant biomass with multiple outlets (PRUVOST, Jörmy and CORNET, Jean-Institut and LE BORGNE, Institut and JENCK, Jean, February 10, 2017, “Industrial production of microalgae and cyanobacteria", Green chemistry and new energy management, in line, TI Publishing, 2017.
- C0 2 gas pollution abatement technologies it is called carbon sinks or carbon dioxide (C0 2 ) sinks: it is a natural or artificial reservoir that absorbs carbon. of the atmosphere and helps to reduce the amount of atmospheric carbon dioxide. Photosynthetic micro-organisms of the microalgae type are particularly interesting for this application.
- the industrial production of photosynthetic micro-organisms requires dedicated technologies to conduct so-called photoprocessing methods of photography capable of allowing photosynthetic growth based on the assimilation, thanks to the light captured, of nutrients inorganic and mineral.
- the cultivation process can be conducted using a wide range of technological solutions ranging from open systems (such as open basins, eg shallow ponds exposed to sunlight) to closed systems and using either solar energy or an artificial source of light.
- open systems such as open basins, eg shallow ponds exposed to sunlight
- Photobioreactors must make it possible to produce high productivity of photosynthetic micro-organisms. It is therefore a question of optimizing their operations in order to maximize their performances.
- Open systems have a major disadvantage of being subject to contamination by dust, other microorganisms, insects and environmental pollutants. In addition, it is difficult to control the processes in open basins.
- Closed systems typically include long pipes forming a circuit developed to allow maximum exposure of an algal solution flowing in the pipes to the light. They also allow the establishment of a thin layer of suspension culture combined with biological purity to cultivate the microorganisms in the best way. Many systems with different shapes and functions have been developed with the aim of being profitable on an industrial scale.
- Photobioreactors are, however, subject to many weather events. For example, natural sunlight is not available during the night or would not be sufficient during weather events such as cloudy skies. In addition, natural light is not sufficient to establish an intensive microalgae culture. Other light sources have been used to overcome these disadvantages.
- patent US495251 1 discloses a photobioreactor for the cultivation of photosynthetic microorganisms that uses a light reservoir or light cavity to distribute a high intensity light and uniformly in a vessel comprising microbial liquid culture compartments .
- the light compartment must have at least one transparent wall having a portion extending into the tank.
- a photobioreactor as described in US4952511 is designed to diffuse the light in the microbial liquid and the light scattering inside the tank can be optimized by decreasing the wall thickness of the culture vessels.
- a high turbidity value reflecting a cloudy algal solution, and a high concentration of organic matter and / or microorganisms in the algal culture have the effect of reducing the intensity of light.
- a simple solution to maintain diffusion under the adverse conditions presented above would be to increase the luminous intensity, beyond the luminous intensity required in a clear solution, so as to maintain a favorable absorption for the microorganisms phototrophic.
- the light intensity must be sufficient even after its attenuation through the thickness of the tank, and / or after passing a given distance in cloudy solution, concentrated in organic matter and / or microorganisms.
- a disadvantage of such a solution is that it may be to the detriment of the profitability of the system (it is necessary to spend more light energy).
- European Patent EP1 169428 discloses a photobioreactor with an improved exchange surface leading to a better spatial distribution of light in the reactor and thus an optimization of the intensity of light in the reactor.
- the subject of the invention of the patent EP1 169428 is a rectangular cross section tank having a greater exchange surface than a tank of circular cross section.
- the patent also relates to a turbulent flow guiding means, allowing a "flash light effect" obtained by increasing the turbulence. This effect is based on the principle that algal cells can, during the dark phases, metabolize the energy they have accumulated during the light phases. This effect is created when the algal cells are exposed to significant light intensity and short distance from the reactor walls during the light phase. A cycle comprising a light phase and a dark phase must be no longer than one second.
- the algal growth is strong and induces an increase in the algal density.
- This last increase has the effect of reducing the diffusion of light in the medium, which in turn induces areas of shade where algal growth will be reduced. These shaded areas will in turn cause an attraction of the algae for the more illuminated walls of the tanks, which reduces the exchange surfaces and reduces the diffusion of light again.
- algae are stressed due to lack of light, affecting the profitability of the system.
- An object of the invention for achieving this goal is a photobioreactor adapted to contain at least one fluid, characterized in that it comprises:
- the second container extending inside the first container, so as to define a first channel between an inner side surface of the first container and an outer side surface of the second container; and forming a second channel within said second container;
- At least one first passage means adapted to allow the circulation of the fluid between the first channel and the second channel
- At least one second passage means adapted to allow the circulation of the fluid between the first channel and the second channel, and disposed above the at least one first passage means;
- At least one light source At least one light source
- gas injection means configured to inject gas in the form of bubbles into the second channel
- the first and second containers, the first and second passage means and the injection means being configured to allow a flow of fluid in the photobioreactor between the first channel and the second channel, and the circulating fluid being adapted to be exposed to the at least one light source.
- first and second containers respectively extend in a first and second longitudinal directions.
- Receptacle means a hollow object intended to receive solid, liquid or gaseous products delimited by at least one lateral surface.
- the object may have no lower and / or higher closure;
- a “first means of passage” may also be called “lower passage means”
- a “second means of passage” may also be called “upper means of passage”
- External lateral surface (or “internal lateral surface”) means the surface extending in the longitudinal direction and delimiting an object on its outermost periphery, (or on its innermost periphery). If the object has a plurality of walls, the outer side surface will be the outer surface of the eccentric wall, and the inner side surface will be the inner surface of the most centered wall.
- the terms “inside” and “outside” must be understood in relation to a radial direction, with respect to the longitudinal direction;
- Circumferential ring means a ring disposed on a circumference of a container, preferably cylindrical;
- Bind means a set of horizontal segments, alternately low and high, connected by vertical segments, the lower segments forming solid (or protuberances) and the upper segments forming voids (or depressions);
- “Lower part” means the part of an element comprising the lower end of said element and may extend above said lower end;
- upper part means the part of an element comprising the upper end of said element and may extend below said upper end;
- Channel means a hollow form able to allow and guide the flow of a fluid
- substantially circular is meant a closed curve substantially defining a circle of radius r, with a standard deviation on the radius of +/- 10% of the radius.
- the fluid contains microorganisms, for example microalgae. It can also be a mixture of fluid and solids. In addition, the fluid can be mixed with the injected gas or the injected gas / solid mixture.
- the inventors have been able to highlight an important technical effect of the invention which makes it possible to improve the exposure of microorganisms (for example micro-algae) to light: the bubbles injected and circulating with the fluid diffract the light they receive, the light is better distributed within the photobioreactor.
- microorganisms for example micro-algae
- the photobioreactor according to the invention makes it possible to solve the problem of allowing intensive production, while avoiding the reduction in algal growth resulting from the reduction of light scattering, and / or of a growing algal density, and or the attraction of algae for the cell walls.
- the circulation of fluid and bubbles that cause the fluid coupled with the diffusion of a light source, increases the exposure of microalgae to light. This allows a diffusion of the light towards the algal liquid as uniform as possible.
- the air injection system by the formation of bubbles and the entrainment of the fluid generates a high shear rate in the medium, homogenizing the medium, preventing algal deposits on the walls, and improving the contact between the micro algae with nutrients for said microalgae and C0 2 .
- the first container is closed at its lower and upper ends.
- first and second longitudinal directions of the first and second containers are parallel, preferably combined.
- the first and second containers are first and second cylinders of revolution, preferably concentric.
- the cylinder-shaped revolution allows to avoid dead zones which are areas of loss of retention of material, and therefore particularly more difficult to clean.
- only one of the first container and the second container is a cylinder of revolution.
- the at least one first passage means is formed by openings in the wall of the second container, preferably in the lower part of said second container.
- the second container is a second cylinder of revolution and comprises a plurality of openings forming first passage means, arranged along at least one second circumferential ring in the wall of said second container, and preferentially in the lower part of said second container.
- the openings are arranged along several first circumferential rings in the wall of the second cylinder.
- the openings must be made throughout the walls to allow the passage of fluid between the first and second channels.
- the at least one first passage means may be formed by slots, and preferably arranged at the lower end of the second container.
- First means of passage must allow the aspiration of the fluid from the first channel to the second channel, while avoiding the diffusion of bubbles emitted in the second channel to the first channel.
- the openings and / or crenellations may advantageously be dimensioned to ensure this double constraint.
- the at least one first passage means is formed by a difference in height between the first container and the second container, the lower end of the second container being located above the lower end of the first container.
- This mode makes it possible to easily adapt the dimensions of the first passage means, in particular as a function of the geometries of the photobioreactor, the characteristics of the algal liquid and / or the injected gas and in particular the bubble sizes in order to optimize the circulation of the fluid.
- the at least one second passage means is formed by a difference in height between the first container and the second container, the upper end of the second container being located below the upper end of the first container.
- This mode makes it easy to adapt the dimensions of the second passage means, in particular as a function of the geometries of the photobioreactor, the characteristics of the algal liquid and / or the injected gas and in particular the bubble sizes in order to optimize the flow of the fluid.
- a second passage means is formed by openings in the wall of the second container, in the upper part of said second container.
- the second container is a second cylinder of revolution and the openings are disposed along at least one second circumferential ring in the wall of said second container, and in the upper part of said second container.
- the openings must be made throughout the walls to allow the passage of fluid between the first and second channels.
- the at least one second passage means may be formed by slots arranged at the upper end of the second container.
- the injection means is capable of generating bubbles of average diameters, preferably less than or equal to 1 mm.
- the injection means is capable of injecting a gas / solid mixture. This is particularly necessary for treating a gas / solid mixture injected into the photobioreactor: the mixture can in particular comprise fine particles contained in the gas to be treated.
- the injection means is disposed below the second container.
- the injection means comprises a membrane, preferably disposed inside and in the lower part of the second container.
- the function of such a membrane is to inject the gas in the form of bubbles of size (s) mastered (s) and / or calibrated.
- the injection means may comprise a fine-bubble diffuser, a hydro-injector, porous stone or any other means capable of performing the function of injecting the gas in the form of bubbles and more precisely control the size (s) of said bubbles.
- At least one light source comprises at least one illuminating wall among at least one wall of the first and second containers. This allows a better homogeneity of light diffusion, without disturbance of the flow of the fluid (no addition of dead zone).
- the at least one light source comprises at least one first light source disposed inside the second container. According to one embodiment, the at least one light source comprises at least a second light source disposed between the first container and the second container.
- At least one light source is disposed on an inner side surface of the second container.
- At least one light source is disposed on an outer side surface of the second container.
- At least one light source is disposed on an inner side surface of the first container.
- the at least one light source comprises at least one third light source disposed outside the first container, for example on an outer lateral surface of the first container, or at a given distance from said first container.
- At least one light source is formed by at least one light column extending along one of the first and second longitudinal directions of the first and second containers.
- At least one light source comprises a coil having a helical shape around an axis parallel to one of the first and second longitudinal directions of the first and second containers, the coil being preferably wound around the first and / or the second container.
- At least one light source comprises LEDs.
- the photobioreactor further comprises at least one recirculation pump configured to circulate the fluid from the lower part of the photobioreactor to the upper part of the photobioreactor.
- the photobioreactor comprises at least one helix.
- At least one helix is arranged in the lower part of the photobioreactor, preferably in the second channel.
- At least one helix is disposed in the first channel.
- At least one wall of the first container is transparent to light.
- At least one wall of the second container is transparent to light.
- Figure 1 illustrates a photobioreactor according to a first embodiment
- FIG. 2 illustrates a photobioreactor according to a second embodiment, comprising two recirculation pumps
- FIG. 3 illustrates a photobioreactor according to a third embodiment, comprising several propellers
- FIGS. 4A and 4B show a photobioreactor according to a fourth embodiment
- FIG. 5 illustrates the flow direction of the fluid in the photobioreactor according to the different embodiments
- FIG. 6 illustrates a first example of location of light sources
- Figs. 7A and 7B illustrate a second example of location of light sources
- Figure 8 illustrates a third example of location of light sources
- Figure 9 illustrates a fourth example of location of light sources
- Figure 10 illustrates a fifth example of location of light sources
- Figure 11 illustrates a sixth example of location of light sources.
- Figure 1 illustrates a photobioreactor 1 according to a first embodiment.
- the photobioreactor 1 comprises a first container 2 which is a first hollow cylinder extending in a first longitudinal direction Z 2 and a second container 3 which is a second hollow cylinder extending in a second longitudinal direction Z 3 and disposed at the Inside the first hollow cylinder 2.
- the two cylinders are cylinders of revolution.
- the axes of revolution of the first and second cylinders are merged, in other words, the cylinders are concentric.
- the space between the two cylinders forms a first channel 42.
- the space in the second cylinder 3 forms a second channel 43.
- the second lower end, or base 31, of the second cylinder 3 may be merged with the base 21 of the first cylinder 2.
- the photobioreactor 1 may advantageously comprise means 9 for fixing the second cylinder 3 and / or positioning it relative to the first cylinder 2, for example so that the first channel 42 formed between the two cylinders is of stable shape.
- the at least one first passage means comprises a plurality of first passage means, or lower passage means, formed by openings 331, each opening having a substantially circular section, being formed in the wall of the second cylinder 3 at the lower portion. 3a of said second cylinder.
- the openings 331 allow passage between the first channel 42 and the second channel 43.
- the openings 331 are made regularly along a first circumferential ring 33 of the wall of the second cylinder.
- the difference in height H between the upper ends of the first and second cylinders defines a second means of passage, or upper passage means 52.
- a fluid can flow in the photobioreactor 1, in particular in the second channel 43 and in the first channel 42.
- the injection means 7 comprises several elements capable of injecting gas in the form of bubbles into the second channel 43.
- the injection means 7 comprises a compressor 72 for sending gas and a membrane 71 adapted to receive the gas and inject it in the form of bubbles.
- the membrane 71 is disposed inside the second cylinder 3.
- the compressor 72 is disposed below the photobioreactor 1.
- the second cylinder 3 and the injection means 7 thus form an air lift system capable of injecting into the photobioreactor a gas, or a mixture of gases, or a gas / solid mixture, and in doing so, circulating the fluid present in the second channel 43.
- the gas / solid mixture can be:
- gaseous mixture air / C0 2 and / or a gaseous mixture comprising solids, in particular fine particles, and in particular microparticles to be treated.
- the gas can be urban air or industrial fumes, containing pollutants, including NO x , which can pass in aqueous form (just like C0 2 ) and contribute to the feeding of micro-algae.
- gas it being understood that it may be a gas mixture, or a gas / solid mixture.
- the fluid is in particular a liquid, more particularly an aqueous solution comprising microalgae, also called "algal solution”.
- the fluid can also define the mixture between the fluid and the gas, the gas mixture or the gas / solid mixture.
- fluid will be used, it being understood that it may be either the algal solution alone, or the mixture of said algal solution with the gas, or with the gaseous mixture, or with the mixture gas / solid.
- the main function of the membrane 71 is to inject the gas in the form of bubbles and especially to control more precisely the size (s) of said bubbles, the gas thus being diffused in the second channel 43 in the form of bubbles, allowing and in particular to dissolve gas, for example C0 2 , in the liquid. This can also contribute to increase agitation in the reactor.
- a membrane it may be a fine bubble diffuser, a grid, a porous stone, a hydro injector or any other means capable of injecting the gas in the form of bubbles and more precisely control the size (s) of said bubbles.
- FIG. 1 There may be several membranes and / or other means capable of injecting the gas in the form of bubbles. All are preferably arranged in the lower part 3a of the second cylinder 3, and / or at several levels in said second cylinder in the longitudinal direction Z 3 of said second cylinder.
- Figure 5 illustrates the flow direction of the fluid. The bubbles from the injection means 7, and in particular the membrane 71, back in the second channel 43 by driving the fluid present in said second channel. The fluid thus driven back into the second channel 43.
- the fluid flows into the first channel 42 through the at least one upper passage means 52, for example formed by the space due to a difference in height between the first and second cylinders 2 and 3 at the upper ends 22 and 32 of said first and second cylinders. Then the fluid goes down to the lower end of the first channel 42.
- the at least one lower passage means 51 allow the suction of the descending fluid in the first channel 42 to the second channel 43 through the upward flow of the second channel, the passage of the fluid again in the second channel 43, and again a fluid entrainment movement by the bubbles since the lower part towards the upper part of the second channel 43, when the gas is injected.
- the injection means 7 can inject gas bubbles continuously into the second channel 42.
- the injection means 7 can inject gas bubbles in batch mode.
- the photobioreactor comprises several light sources 8 represented in FIG. 1 in the form of several first light columns 810 disposed on the wall inside the second cylinder 3 and extending in the longitudinal direction Z 3 of said second cylinder. .
- the photobioreactor comprises several light sources 8 represented in FIG. 1 in the form of several first light columns 810 disposed on the wall inside the second cylinder 3 and extending in the longitudinal direction Z 3 of said second cylinder. .
- FIGS. 6, 7A, 7B, 8 to 1 Other arrangements of light sources are presented more precisely with FIGS. 6, 7A, 7B, 8 to 1 1. All these arrangements can be combined with the photobioreactor illustrated in FIG. 1, or with the other embodiments presented below. after.
- FIG. 2 illustrates a photobioreactor 1 according to a second embodiment, which differs from the first mode in that it furthermore comprises at least one recirculation pump 10.
- recirculation pumps 10 disposed outside the first cylinder 2. Said pumps make it possible to accentuate the flow rate of the fluid. They are configured to suck the fluid from the lower part of the photobioreactor, for example in the lower part of the first channel 42 and reinject it into the upper part of the photobioreactor, for example in the upper part of the first channel 42, accentuating the phenomenon of air lift.
- the number of pumps and the arrangement of the pump or pumps can be adapted to allow to increase the flow rate of the fluid.
- the photobioreactor of the second embodiment may comprise all or some of the elements described for the first mode.
- FIG. 3 illustrates a photobioreactor according to a third embodiment which differs from the first mode in that it comprises at least one helix 11.
- the photobioreactor comprises three propellers 1 1.
- a propeller is arranged in the lower part of the second channel 43.
- the arrangement and the orientation of a propeller are made in such a way that the propeller can apply upward movement to the fluid from the lower end to the upper end of said second channel.
- Two other propellers are arranged in the first channel 42 so as to apply a downward movement to the fluid in said first channel from the upper end to the lower end of said first channel.
- the propellers driven by a motor disposed outside the photobioreactor 1, rotate and agitate the fluid inside the photobioreactor.
- the propellers create a stirring which makes it possible to accentuate the stirring of the fluid in the photobioreactor.
- the number of propellers and the arrangement of the propeller (s) in the photobioreactor can be adapted to obtain the same effect.
- the photobioreactor of the third embodiment may comprise all or some of the elements described for the first mode.
- FIGS. 4A and 4B show an example of a photobioreactor according to a fourth embodiment.
- FIG. 4A illustrates a photobioreactor 1 comprising a first cylinder 2 of revolution of first external diameter D2 extending in a first longitudinal direction Z 2 on a first height H2 and a second cylinder 3 of revolution of second outer diameter D3 extending according to a second longitudinal direction Z 3 on a second height H3. Both cylinders are cylinders of hollow revolution and are concentric.
- the space between the two cylinders forms a first channel 42.
- the first channel 42 has a cylindrical sleeve shape of height equal to the height H3 of the second cylinder 3 and whose width corresponds to (D2-D3) / 2 (and (D2-D31) / 2 at the base 31 of the second cylinder, as explained later).
- the height H between the two cylinders forming a second passage means 52 is equal to H2-H3.
- the photobioreactor 1 comprises holding means 9 able to position and / or hold the second cylinder 3 relative to the first cylinder 2.
- the holding means 9 comprise holding tabs 91 arranged at the level of the upper part 3b, preferably at the upper end 32 of the second cylinder 3, and capable of positioning the second cylinder 3 with respect to the first cylinder 2.
- centering lugs 92 fixed to the base 21 of the first cylinder 2 and able to center the second cylinder 3 relative to the first cylinder 2.
- the side wall of the first cylinder 2 is made of transparent PVC, and its thickness is for example 10 mm.
- the base 21 of the first cylinder 2 is non-transparent PVC and its thickness is for example 10 mm.
- the base 21 of the first cylinder 2 is traversed by two passages 26, for example tappings, allowing the arrival and / or the exit of a fluid or a fluid / solid mixture within said first cylinder.
- the second cylinder 3 is disposed on the base 21 of the first cylinder 2, and is centered with respect to said first cylinder by means of the centering lugs 92.
- the base 31 of the second cylinder has a diameter D31 greater than the diameter D3 and comprises a crenellated lower end 31 1, the protruding portions 31 1b are in contact with the base 21 of the first cylinder.
- the height of the lower end is equal to H31.
- Each depression of a slot 31 1a may have a length L31 1a and a height H31 1a.
- the depressions 31 1 has slots can form first passage means for the fluid.
- the injection means 7 comprises several elements capable of injecting gas in the form of bubbles into the second channel 43.
- the injection means 7 comprises a compressor 72 for sending gas and a membrane 71 capable of receiving the gas and injecting it in the form of bubbles and diffusing it in the second channel 43.
- the compressor 72 is disposed below the photobioreactor 1.
- the membrane 71 is disposed in the base 31 of the second cylinder 3. It is in the form of a flat disc of diameter D71.
- FIG. 4B illustrates more precisely the second revolution cylinder 3.
- the side wall of the second cylinder 3 is made of transparent PVC, and its thickness is for example 5 mm.
- the second cylinder 3 further comprises first passage means in the form:
- second openings 331 'of diameters D331' arranged and evenly distributed along a second circumferential ring 33 'in the wall of the second cylinder, at a height equal to H33' with respect to the point of contact of the base 31 of said second cylinder with the base 21 of the first cylinder.
- the aforementioned dimensions can be:
- the photobioreactor comprises a plurality of light sources 8 shown as columns or tubes 810 in Figs. 4A and 4B, but which may be otherwise configured as shown hereinafter.
- Several light sources 8 can create a uniform light pattern by being spaced 10 cm apart from each other.
- FIGS. 6, 7A, 7B, 8, 9, 10, 1 1 illustrate several arrangements of light sources.
- the light sources are preferably spaced apart from each other by a maximum of 10 cm.
- first container 2 is shown as being a cylinder of revolution, of longitudinal direction Z 2 and the second container 3 is shown as being a cylinder of revolution, of longitudinal direction Z 3 .
- FIGS. 6, 7A, 7B, 8, 9, 10, 1 1 are represented cylinders of revolution and the corresponding description expresses first and second cylinders, it being understood that this may be containers that are not necessarily cylinders, and not necessarily cylinders of revolution.
- the different arrangements of light sources can be combined with each other.
- the lighting is preferably made by LEDs, but other sources of light can be envisaged. This can be spots, or garlands or light ribbons. Other modes are presented below.
- the bubbles themselves can be sources of light because they can diffract the light and send it back to the fluid.
- the intensity of the light sources must be adapted: an intensity too high may grill the micro-algae, and on the contrary, too low intensity makes them stick to the walls of the reactor.
- FIG. 6 illustrates a first example in which the light sources 8 comprise first light sources 81 disposed inside the second cylinder 3.
- first light columns 810 extending in the longitudinal direction Z 3 of the second cylinder 3.
- the first light columns 810 are positioned on the inner side surface of said second cylinder, and are distributed evenly. In this example, eight light columns 810 are shown, but there may be fewer, or more.
- the first light columns 810 may be attached to a wall of the second cylinder 3, for example by a latching system.
- a latching system In a photobioreactor whose cylindrical walls are opaque, especially those of the second cylinder, it is important that the light sources can diffuse the light 360 ° and therefore they are not glued to the walls of the cylinders.
- the first light columns 810 can be positioned inside the second cylinder 3, but not on a lateral surface of said cylinder, as illustrated in FIGS. 7A (in 3D view) and 7B (in view of FIG. above): second example of location.
- the spacing of the first light columns 810, and more broadly the spacing of the first light sources 81, with the inner side surface of the second cylinder 3 depends on the turbidity of the medium, the concentration of algae, but also the light intensity. issued.
- second light columns 820 can be positioned between the first and the second cylinder, on the outer lateral surface of the second cylinder 3 as illustrated in Figure 8 in top view (third example of location).
- second light columns 820 can be positioned between the first and second rolls, but not necessarily on the outer side surface of the second roll.
- FIG. 9 illustrates a fourth example of location of light sources 8, seen from above.
- first light sources 81 are disposed inside the second cylinder 3 and third light sources 83 are disposed outside the first cylinder 2.
- the first light sources 81 are in the form of light columns 810 disposed inside the second cylinder 3.
- the first light columns 810 extend in the longitudinal direction Z 3 and are positioned at a given distance from the inner side surface of the second cylinder 3. They can be arranged alternately according to one of the first and third examples presented, or according to a combination of the first to third location examples.
- the third light sources 83 are in the form of several second light columns 830 extending along the longitudinal direction Z 2 of the first cylinder 2. They can be positioned against the wall of the first cylinder 2 or at a distance D83 of the first cylinder 2 .
- the distance D83 between the third light columns 830 and the outer lateral surface of the first cylinder 2, and more widely between the third light sources 83 and said wall, depends on the turbidity of the medium, the concentration of algae, but also the luminous intensity delivered.
- Figure 10 illustrates a fifth example of location of light sources.
- second light sources 82 are disposed outside the second cylinder 3 and third light sources 83 are disposed outside the first cylinder 2.
- the third light sources 83 are in the form of third light columns 830 extending along the longitudinal direction Z 2 of the first cylinder 2. They can be positioned against the outer lateral surface of the first cylinder 2 or at a distance D83 from the first cylinder 2.
- the third light sources 83 may not be integrated.
- the second light sources 82 comprise a second light coil 821 forming a helix whose axis corresponds to the longitudinal direction Z 3 of the second cylinder 3, disposed around the outer lateral surface of said second cylinder.
- a first light coil may be disposed inside the second cylinder 3.
- a third light coil may be disposed outside the first cylinder 2.
- the second, or first, light coil may be positioned on the outer or inner side surface of said second cylinder or positioned at a given distance from said side surface.
- the third light coil may be positioned on the outer side surface of the first cylinder or positioned at a given distance from said side surface.
- FIG. 11 illustrates a sixth example of a location of light sources, which differs from the fifth example in that the third light sources 83 comprise segments of light bars 832 extending along the longitudinal direction Z 2 of the first cylinder 2 and positioned outside said first cylinder.
- the third light sources 83 may be positioned against the wall outside the first cylinder 2 or at a distance D83 from the first cylinder 2.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1762943A FR3075815B1 (fr) | 2017-12-22 | 2017-12-22 | Photobioreacteur |
PCT/EP2018/085867 WO2019121933A1 (fr) | 2017-12-22 | 2018-12-19 | Photobioreacteur |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3728546A1 true EP3728546A1 (fr) | 2020-10-28 |
Family
ID=62528493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18826007.9A Pending EP3728546A1 (fr) | 2017-12-22 | 2018-12-19 | Photobioreacteur |
Country Status (6)
Country | Link |
---|---|
US (1) | US11639488B2 (fr) |
EP (1) | EP3728546A1 (fr) |
CN (1) | CN111511892A (fr) |
CA (1) | CA3085888A1 (fr) |
FR (1) | FR3075815B1 (fr) |
WO (1) | WO2019121933A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3107459B1 (fr) | 2020-02-20 | 2022-01-14 | Suez Groupe | Installation et procede d’epuration d’air |
CN113150976A (zh) * | 2021-05-13 | 2021-07-23 | 云南爱尔发生物技术股份有限公司 | 一种微藻的集约化培育系统 |
CO2021014692A1 (es) * | 2021-10-29 | 2023-05-08 | Tikray S A S | Fotobiorreactor con arreglo óptico para el cultivo de microalgas |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4952511A (en) | 1987-06-11 | 1990-08-28 | Martek Corporation | Photobioreactor |
DE19916597A1 (de) | 1999-04-13 | 2000-10-19 | Fraunhofer Ges Forschung | Photobioreaktor mit verbessertem Lichteintrag durch Oberflächenvergrößerung, Wellenlängenschieber oder Lichttransport |
CN1247766C (zh) * | 2001-09-27 | 2006-03-29 | 中国科学院过程工程研究所 | 一体式的气升式光生物反应器及其用途 |
CN1483807A (zh) * | 2003-06-27 | 2004-03-24 | 中国科学院海洋研究所 | 饵料微藻培养装置 |
WO2008010737A1 (fr) * | 2006-07-21 | 2008-01-24 | Tecnia Processos E Equipamentos Industriais E Ambintais | Photobioréacteur pour une culture de microorganismes photosynthétiques |
FR2943685B1 (fr) * | 2009-03-25 | 2011-04-29 | Microphyt | Reacteur photosynthetique pour la culture de microorganiques et procede de culture de microorganismes |
WO2010138571A1 (fr) * | 2009-05-28 | 2010-12-02 | Coastal Biomarine, Llc | Photobioréacteur et procédé de culture et de récolte de micro-organismes |
FR2974814B1 (fr) * | 2011-05-06 | 2017-06-02 | Acta Alga | Photobioreacteur en milieu ferme pour la culture de micro-organismes photosynthetiques |
GB201120550D0 (en) * | 2011-11-29 | 2012-01-11 | Xanthella Ltd | Photobioreactor |
ES2482015B2 (es) * | 2012-09-19 | 2015-07-09 | Universidad De Alicante | Fotobiorreactor combinado tipo air-lift para la producción de biomasa |
US9605238B2 (en) * | 2013-10-01 | 2017-03-28 | Arizona Technology Innovation Group, Inc. | Photo-bioreactor system and method for production of bio-materials |
US20160113224A1 (en) * | 2014-10-24 | 2016-04-28 | Morgan Hill Bioenergy, Inc. | Large-scale algae cultivation system with diffused acrylic rods and double parabolic trough mirror systems |
CN104988059B (zh) * | 2015-05-19 | 2019-01-04 | 何忠志 | 一种用于藻类养殖的光生物反应器 |
CN105219635A (zh) * | 2015-09-16 | 2016-01-06 | 浙江大学舟山海洋研究中心 | 一种内置光源气升式内环流光合生物反应器 |
CN204999909U (zh) * | 2015-09-16 | 2016-01-27 | 浙江大学舟山海洋研究中心 | 内置光源气升式内环流光合生物反应器 |
CN206462017U (zh) * | 2017-01-21 | 2017-09-05 | 巢湖学院 | 一种桶式光生物反应器 |
-
2017
- 2017-12-22 FR FR1762943A patent/FR3075815B1/fr active Active
-
2018
- 2018-12-19 US US16/771,522 patent/US11639488B2/en active Active
- 2018-12-19 CA CA3085888A patent/CA3085888A1/fr active Pending
- 2018-12-19 CN CN201880082985.3A patent/CN111511892A/zh active Pending
- 2018-12-19 WO PCT/EP2018/085867 patent/WO2019121933A1/fr unknown
- 2018-12-19 EP EP18826007.9A patent/EP3728546A1/fr active Pending
Also Published As
Publication number | Publication date |
---|---|
CA3085888A1 (fr) | 2019-06-27 |
US11639488B2 (en) | 2023-05-02 |
FR3075815A1 (fr) | 2019-06-28 |
CN111511892A (zh) | 2020-08-07 |
US20210179987A1 (en) | 2021-06-17 |
FR3075815B1 (fr) | 2020-08-07 |
WO2019121933A1 (fr) | 2019-06-27 |
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