JP2013021981A - Light irradiation type culture apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote photosynthesis irrespective of turbidity of a culture solution.SOLUTION: A partition cylinder 3 for an air lift having the internal space 14 between an inner cylindrical member 10 and an outer cylindrical member 11 is arranged in the central part of a culture tank 1. A fluorescent lamp 18 to be a light source is arranged in the internal space 14 of the partition cylinder 3. Convex portions 10a, 11a for functioning the surrounding wall as a plane-convex lens and concave portions 10b, 11b for functioning the surrounding wall as a plane-concave lens are alternately arranged in the vertical direction in the inner cylindrical member 10 and the outer cylindrical member 11. In inside and outer peripheral side regions of the partition cylinder 3, bright sections for condensing rays of the fluorescent lamp 18 at the parts where the convex portions 10a, 11a are made on the inner cylindrical member 10 and the outer cylindrical member 11 and dark sections are alternately formed. The photosynthesis is promoted owing to a flashing light effect by bringing microalgae moving with a circulation flow of the culture solution 2 formed in the culture tank 1 to pass through the bright section and the dark section one by one.

Description

  The present invention relates to a light irradiation type culture apparatus used for culturing photosynthetic organisms such as microalgae.

  As one of the culture methods for culturing photosynthetic organisms such as microalgae suspended in a culture solution, it is known to use an airlift type culture tank (see, for example, Patent Document 1).

  In addition, when cultivating photosynthetic organisms such as algae suspended in a culture solution, photosynthesis is performed by the flashing light effect (light reaction of light synthesis, dark reaction cycle effect) by alternately giving the brightness of illumination light. Conventionally, it has been proposed to increase the efficiency of the photosynthesis and promote the growth of the photosynthetic organism (see, for example, Patent Document 2).

JP-T-2002-541788, FIG. JP 2007-43909 A

  However, the conventional air-lift type culture tank as shown in Patent Document 1 usually has a peripheral wall having light permeability of the culture tank that emits light emitted from an external light source disposed around the culture tank. The medium is simply permeated to irradiate the culture solution in which the photosynthetic organisms in the culture tank are suspended. Therefore, the light from the light source is less likely to pass through the culture solution when the turbidity of the culture solution increases with the lapse of culture time.

  Therefore, in the state where the turbidity of the culture solution is increased, the light from the light source hits only the photosynthetic organisms contained in the culture solution near the peripheral wall of the culture tank. For this reason, the above-mentioned conventional air lift type culture tank is actually using light energy efficiently.

  Moreover, Patent Document 1 does not show any idea of promoting photosynthesis of photosynthetic organisms by the flashing light effect.

  On the other hand, Patent Document 2 discloses the idea of promoting photosynthesis of photosynthetic organisms by the flashing light effect.

  However, the means for imparting light and darkness to the photosynthetic organism shown in Patent Document 2 is that the photosynthetic organism has a bright portion near the peripheral wall of the culture vessel and a central portion of the vessel due to the geltler vortex generated in the culture vessel This is realized by moving the dark part alternately. Therefore, when the amount (concentration) of suspended photosynthetic organisms is low and the turbidity of the culture solution is low, such as the culture solution at the beginning of the culture, the irradiated light can easily reach the center of the culture vessel. Therefore, the difference in the amount of light (difference in brightness) between the vicinity of the peripheral wall of the culture vessel and the center of the vessel is small. Therefore, the technique disclosed in Patent Document 2 reduces the flashing light effect given to photosynthetic organisms when the turbidity of the culture solution is low.

  Therefore, the present invention provides a light that can efficiently provide a flushing light effect to photosynthetic organisms suspended in the culture solution, regardless of the turbidity of the culture solution, and promote the growth of the photosynthetic organisms. An object is to provide an irradiation type culture apparatus.

  In order to solve the above-mentioned problems, the present invention corresponds to claim 1, a culture tank for storing a culture solution for suspending photosynthetic organisms, and a light-transmitting partition tube provided inside the culture tank A diffuser tube for blowing gas bubbles into the culture solution stored in the culture tank, and an illuminating means for illuminating the culture solution in the culture tank And the lighting means alternately arranges bright and dark portions in the vertical direction on the inner region and the outer peripheral region of the partition tube to collect and irradiate the illumination light from the light source. The light irradiation type culture apparatus is characterized in that it is formed.

  Further, in the above configuration, the illumination means includes a light source for irradiating illumination light to the inner region and the outer peripheral region of the partition tube, and bright and dark portion alternate forming means arranged on the side of the light source facing the culture solution. It is set as the structure which becomes.

  Further, in the above configuration, the bright and dark portion alternate forming means is configured to include convex lenses or slits arranged in the vertical direction.

  Furthermore, in the above-described configuration, the inner cylinder member of the partition cylinder having a hollow double cylinder structure having an inner space for storing a light source between the inner cylinder member and the outer cylinder member, and A plurality of convex lenses or slits extending in the horizontal direction are provided on the wall surface of the outer cylinder member in the vertical direction.

According to the light irradiation type culture apparatus of the present invention, the following excellent effects are exhibited.
(1) A culture tank for storing a culture solution in which photosynthetic organisms are suspended; a light-transmitting partition provided inside the culture tank; and a gas cylinder provided below a lower end opening of the partition. An aeration tube for blowing air bubbles into the culture solution stored in the culture tank; and illumination means for illuminating the culture solution in the culture tank, and the illumination means includes a region inside the partition tube and Since the bright part and the dark part that condense and irradiate the illumination light from the light source are arranged alternately in the vertical direction in the outer peripheral area, the partition is blown from the air diffuser. When circulating the culture solution in the culture tank by the air lift effect caused by the bubbles rising inside the tube, the photosynthetic organisms suspended in the culture solution are alternately passed through the light and dark parts that are formed in advance. Can be light by flashing light effect The aim of promoting the growth, can be promoted of the growth of the optical synthetic organisms.
(2) Moreover, since the bright part is formed by collecting and irradiating illumination light from a light source, even if the turbidity of the culture broth is increased, the bright part is deep into the culture broth. Can be formed. Therefore, the utilization efficiency of light energy can be improved.

It is a general | schematic cutting side view which shows one Embodiment of the light irradiation type culture apparatus of this invention. It is an AA direction arrow line view of FIG. It is sectional drawing which shows the detailed structure of the bright part dark part alternating formation means with which the illumination means of the apparatus of FIG. 1 was equipped. It is a figure corresponding to FIG. 3 which shows another example of the bright part dark part alternating formation means of an illumination means as another form of implementation of this invention. It is a figure corresponding to FIG. 3 which shows another example of the bright part dark part alternating formation means of an illumination means as another form of implementation of this invention. It is a general | schematic cutting side view which shows other form of implementation of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 to FIG. 3 show an example of the case where microalgae as photosynthetic organisms are to be cultured as one embodiment of the light irradiation type culture apparatus of the present invention.

  That is, the culture tank 1 for storing the culture solution 2 for suspending the above-mentioned microalgae to be cultured is provided with a partition cylinder 3 for airlift that is formed in a cylindrical shape extending in the vertical direction at the center portion thereof.

  The culture tank 1 is provided with a diffuser tube 4 below the partition tube 3 at the bottom thereof.

  The aeration tube 4 is connected to a gas supply line 5 for introducing pressurized gas from a gas supply unit (not shown) provided outside the culture tank 1. When the photosynthetic organism to be cultured is a microalga as described above, carbon dioxide is required for the photosynthesis. Therefore, in the present embodiment, the gas supplied to the diffusion tube 4 through the gas supply line 5 is a gas that can form bubbles in the culture solution 2 and contains carbon dioxide, for example, air 6 is used.

  As a result, the air diffuser 4 allows the pressurized air 6 guided through the gas supply line 5 from a gas supply unit (not shown) to the culture medium 2 stored in the culture tank 1. It can be blown through as a bubble. Further, the air bubbles floating in the culture solution 2 from the air diffuser 4 rise through the inside of the partition tube 3. Therefore, as the bubbles of the air 6 rise inside the partition tube 3, the culture solution 2 existing inside the partition tube 3 flows upward as shown by an arrow a in FIG. (Hereinafter referred to as upward flow a). Further, due to the upward flow a inside the partition tube 3, the culture solution 2 existing outside the partition tube 3 flows downward as shown by the arrow b in FIG. 1 (hereinafter referred to as downward flow b). ). Therefore, the culture tank 1 circulates through the stored culture solution 2 through the upper side, the outer side, and the lower side of the partition tube 3 in order from the inner side of the partition tube 3 and returns to the inner side of the partition tube 3 again. It is comprised so that a flow can be formed.

  Furthermore, the culture tank 1 is provided with illumination means 7 for illuminating the culture solution 2. The illuminating means 7 is applied to the upward flow a of the culture solution 2 formed inside the partition tube 3 in the culture tank 1 and the downward flow b of the culture solution 2 formed outside the partition tube 3. On the other hand, a bright part and a dark part that collect and irradiate the illumination light from the light source can be alternately formed in the flow direction, that is, in the vertical direction.

  More specifically, the culture tank 1 is made of, for example, stainless steel and has an opening on the upper end side, a cylindrical tank body 8 with the lower end closed, and a lid 9 for closing the opening of the tank body 8. Has been. The said tank main body 8 is provided with the flange part 8a in the periphery of the upper end side opening. The flange portion 8a is configured such that the outer peripheral portion of the lid 9 can be detachably fixed through fixing means (not shown) such as a bolt, a nut and a buckle.

  Furthermore, at least the inner peripheral surface (inner side surface) of the tank body 8 is mirror-finished so that the illumination light from the illumination means 7 can be used effectively as will be described later.

  The partition cylinder 3 includes a transparent inner cylinder member 10 made of a light-transmitting material and a transparent outer cylinder member 11 made of a light-transmitting material concentrically arranged on the outside with a predetermined gap. A ring-shaped ceiling member 12 and a bottom member 13 are attached in a watertight manner between the respective upper end portions and the respective lower end portions, and an internal space 14 is provided between the inner cylindrical member 10 and the outer cylindrical member 11. It has a hollow double cylinder structure.

  Further, the ceiling member 12 is provided with openings 15 penetrating vertically at a plurality of locations in the circumferential direction. The plurality of openings 15 in the circumferential direction serve as a plurality of light sources to be arranged and stored in the inner space 14 of the partition tube 3 at predetermined intervals in the circumferential direction as will be described later in order to constitute the illumination means 7. It is set so as to correspond to the circumferential arrangement when the fluorescent lamp 18 is arranged.

  At the peripheral edge of each opening 15 of the ceiling member 12 of the partition tube 3, a lower end portion of an individual tube member 16 as a support member extending a predetermined dimension in the vertical direction is attached in a watertight manner.

  Furthermore, each said cylindrical member 16 penetrates the lid | cover 9 of the said culture tank 1, and makes it project an upper end side upwards. For this purpose, the lid 9 is provided with an opening portion 17 penetrating in the vertical direction in an arrangement corresponding to each cylindrical member 16, and is inserted into the opening portion 17 at the lower peripheral edge portion of each opening portion 17. The above-described tubular members 16 are attached in an airtight manner.

  Thus, the partition tube 3 is supported on the lid 9 via the tube members 16. Furthermore, each cylindrical member 16 attached to each opening 17 of the lid 9 can communicate the internal space 14 of the partition cylinder 3 to the outside through the inside thereof.

  Therefore, the lid 9 in a state where the partition tube 3 is supported is attached to the upper end side opening of the tank body 8 to form the culture tank 1, so that the partition cylinder 3 is placed at the central portion of the culture tank 1. In a concentric arrangement with the tank body 8 and fixed with a predetermined gap between the lower end of the partition tube 3 and the inner bottom surface of the tank body 8 serving as the inner bottom surface of the culture tank 1. I can do it. At this time, the upper end of the partition tube 3 disposed in the center portion of the culture tank 1 is disposed below the liquid level when a predetermined amount of the culture solution 2 is stored in the culture tank 1 by a predetermined dimension. It is assumed that the vertical dimension of the partitioning cylinder 3 and the vertical dimension of each cylindrical member 16 are set so that they can be performed.

  As a result, each of the tubular members attached in the circumferential direction to the upper side of the partition tube 3 in which the culture liquid 2 stored up to the predetermined liquid level in the culture tank 1 is submerged by a predetermined dimension below the liquid level. Through the gap between 16, the partition tube 3 can freely flow in and out of the partition tube 3.

  Further, since the partition tube 3 arranged so as to be immersed below the liquid surface of the culture solution 2 has a hollow double tube structure including the internal space 14, buoyancy acts on the partition tube 3. It becomes like this. Therefore, this buoyancy can be transmitted to and received by the lid 9 via each cylindrical member 16.

  In the central portion of the inner bottom portion of the tank body 8 of the culture tank 1, an air diffuser 4 is installed corresponding to a region that is within the planar shape of the lower end opening of the partition tube 3. The gas inlet 4a of the air diffuser pipe 4 penetrates the bottom plate of the tank body 8 inward and outward and protrudes outward. The gas supply line 5 is connected to the gas inlet 4a. Thereby, the air 6 pressurized to a pressure higher than the water pressure acting on the bottom of the culture tank 1 by the culture solution 2 stored in the culture tank 1 is supplied to the gas supply line 4 in the diffusion tube 4. Then, the gas is supplied from the gas inlet 4 a of the air diffuser 4 through 5. The air 6 blown into the culture solution 2 in the culture tank 1 from the air diffuser 4 is allowed to rise inside the partition tube 3 as bubbles.

  The amount of air 6 blown into the culture solution 2 from the diffuser tube 4 can be adjusted, and by adjusting the amount of bubbles that lift the inside of the partition tube 3 from the diffuser tube 4, The strength of the air lift effect that acts on the culture medium 2 existing inside can be changed. Thereby, in the culture tank 1, the entire stored culture solution 2 is circulated back from the inside of the partition tube 3 to the inside of the partition tube 3 again through the upper side, the outside, and the lower side of the partition tube 3. The speed (strength) when flowing can be controlled, and the culture solution 2 in the culture tank 1 is prevented from staying locally and stagnant with the microalgae to be cultured. The suspension state of the culture solution 2 in the tank 1 can be maintained uniformly.

  Further, when the air 6 is blown into the culture solution 2, carbon dioxide consumed in the photosynthesis of microalgae can be supplied to the culture solution 2 from the bubbles of the blown air 6.

  As shown in FIG. 1, the illumination means 7 includes a fluorescent lamp holder 19 that extends in the vertical direction with a thickness that can be inserted into a cylindrical member 16 attached to the opening 17 of the lid 9. One end of the fluorescent lamp 18 is attached to the lower end side of the fluorescent lamp holder 19 so that the fluorescent lamp 18 can be held in a vertically extending posture. The fluorescent lamp holder 19 can be turned on by supplying power to the fluorescent lamp 18.

  The fluorescent lamp holder 19 holding the fluorescent lamp 18 is individually inserted from above the lid 9 into each cylindrical member 16 attached to each opening 17 of the lid 9 of the culture tank 1. 16 is mounted inside. Each fluorescent lamp 18 held in each fluorescent lamp holder 19 passes through each opening 17 of the lid 9, the inside of each cylindrical member 16, and each opening 15 of the ceiling member 12 in the partition cylinder 3. , And can be arranged by being inserted into the internal space 14 of the partition tube 3. As a result, a plurality of fluorescent lamps 18 are arranged as light sources in the inner space 14 of the partition tube 3 at predetermined intervals in the circumferential direction.

  Therefore, a plurality of fluorescent lamps 18 arranged in the circumferential direction in the inner space 14 of the partition tube 3 are lit to emit light. The light emitted from each fluorescent lamp 18 is transmitted through the transparent inner cylinder member 10 of the partition tube 3, and is present inside the partition tube 3 (on the axial center side) that is inside the inner tube member 10. 2 can be irradiated. At the same time, the light emitted from each of the fluorescent lamps 18 is transmitted through the transparent outer cylinder member 11 and also to the culture solution 2 existing on the outer peripheral side of the partition tube 3 that is the outer peripheral side of the outer cylindrical member 11. It can be irradiated.

  Further, in the light irradiation type culture apparatus of the present invention, during the cultivation of microalgae, any one of the fluorescent lamps 18 arranged in the internal space 14 of the partition tube 3 reaches the end of its life. When the flashing occurs or the lighting stops, the fluorescent lamp holder 19 of the fluorescent lamp 18 that has reached the end of its life can be removed by pulling it out above the lid 9 of the culture tank 1 from the tubular member 16. It is like that. Therefore, the light irradiation type culture apparatus of the present invention reaches the above-mentioned lifetime while continuing the culture without requiring the operation of temporarily suspending the culture in the culture tank 1 or removing the lid 9 of the culture tank 1. The fluorescent lamp 18 can be replaced.

  Furthermore, the illumination means 7 in the present embodiment is an upper and lower direction which is the flow direction with respect to the upward flow a and the downward flow b of the culture solution 2 formed inside and outside the partition tube 3 in the culture tank 1. In order to alternately form a bright part and a dark part for condensing and irradiating illumination light in the direction, a bright part dark part alternating forming unit is provided.

  The bright part dark part alternate forming means is provided on the transparent inner cylinder member 10 and the transparent outer cylinder member 11 of the partition cylinder 3. That is, the inner cylinder member 10 has, on the inner peripheral surface thereof, a convex portion 10a that protrudes toward the axial center continuously in the circumferential direction that is the horizontal direction, and a concave portion that is recessed toward the side away from the axial center continuously in the circumferential direction. 10b are alternately provided in the vertical direction at predetermined intervals, which will be described later, so that the cross section of the inner peripheral surface of the inner cylinder member 10 has a wave shape in the vertical direction. Further, the outer cylinder member 11 has, on the outer peripheral surface thereof, a convex portion 11a that protrudes toward the side away from the axis continuously in the circumferential direction that is the horizontal direction, and a side that is adjacent to the axis continuously in the circumferential direction. Recessed recesses 11b are alternately provided in the vertical direction at predetermined intervals, which will be described later, so that the outer peripheral surface of the outer cylinder member 11 has a corrugated shape in the vertical direction.

  In addition, the light part dark part alternating formation means which is the said structure is provided with the internal peripheral surface in which the convex part 10a and the recessed part 10b of the said inner cylinder member 10 are provided, and the convex part 11a and the recessed part 11b of the said outer cylinder member 11. Both outer peripheral surfaces are in contact with the culture medium 2. In view of this point, the transparent material having optical transparency constituting the inner cylindrical member 10 and the transparent material having optical transparency constituting the outer cylindrical member 11 are both between the culture solution 2 and The material has a difference in refractive index.

  Thereby, as shown in FIG. 3, the said inner cylinder member 10 becomes a plano-convex lens in which the peripheral wall of the part in which each said convex part 10a is provided in the internal peripheral surface continues in the circumferential direction. For this reason, when the light emitted from each fluorescent lamp 18 installed in the internal space 14 of the partition tube 3 passes through the peripheral wall of the inner cylinder member 10 in the portion where the projections 10a are provided, Due to refraction based on the difference in refractive index between the material of the tubular member 10 and the culture solution 2, light is condensed from both the upper and lower sides toward the focal point f1 existing on the horizontal plane including the apex of each convex portion 10a.

  On the other hand, the peripheral wall of the portion where the concave portions 10b are provided on the inner peripheral surface of the inner cylinder member 10 is a plano-concave lens that is continuous in the circumferential direction. For this reason, when the light emitted from the fluorescent lamps 18 installed in the internal space 14 of the partition tube 3 passes through the peripheral wall of the portion where the concave portions 10b are provided, the light is diffused in the vertical direction. It becomes like this.

  Therefore, in the inner region of the partition tube 3, each of the fluorescent lights is arranged at predetermined intervals in the vertical direction corresponding to the positions where the protrusions 10 a are provided on the inner peripheral surface of the inner tube member 10 of the partition tube 3. Bright portions irradiated with the light emitted from the lamp 18 being condensed are formed, and predetermined intervals in the vertical direction corresponding to positions where the concave portions 10b are provided on the inner peripheral surface of the inner cylinder member 10. Each time, a dark portion is formed in which the amount of light is lower than that of each of the bright portions. Therefore, in the region inside the partition tube 3, the bright part and the dark part are alternately formed in the vertical direction.

  In addition, as shown in FIG. 3, the focus f1 when the peripheral wall of the part in which each said convex part 10a is provided in the inner peripheral surface of the said inner cylinder member 10 functions as a plano-convex lens is shown with a dashed-dotted line in FIG. It is desirable to set so as to be arranged at the axial center position O of the inner cylinder member 10 as described above. In this way, the light collected at one place in the circumferential direction of the peripheral wall of the portion where the convex portions 10a are provided on the inner peripheral surface of the inner cylindrical member 10 diffuses after passing through the focal point f1. In this case, the light is condensed at a position 180 degrees opposite to the circumferential direction of the peripheral wall of the portion where the same convex portion 10a is provided, and passes through almost the same path as the light path toward the focal point f1 in the opposite direction. For this reason, the area | region inside the partition cylinder 3 can gather light more efficiently in the bright part formed for every up-down direction position (height position) in which each convex part 10a of the said inner cylinder member 10 is provided. Thus, the difference in light quantity between the bright part and the dark part can be further increased.

  Further, as shown in FIG. 3, the outer cylinder member 11 is provided with a peripheral wall of a portion where the convex portions 11 a are provided on the outer peripheral surface of the outer cylinder member 11, as in the case of the inner cylinder member 10. The plano-convex lens is continuous in the direction. For this reason, when the light emitted from each fluorescent lamp 18 installed in the internal space 14 of the partition tube 3 passes through the peripheral wall of the portion where the projections 11a are provided, the material of the outer tube member 11 By the refraction based on the difference in refractive index between the liquid and the culture solution 2, the light is condensed from both the upper and lower sides toward the focal point f2 existing on the horizontal plane including the apex of each convex portion 11a.

  On the other hand, the peripheral wall of the portion where the concave portions 11b are provided on the outer peripheral surface of the outer cylinder member 11 is a plano-concave lens that is continuous in the circumferential direction. For this reason, when the light emitted from each fluorescent lamp 18 installed in the internal space 14 of the partition tube 3 passes through the peripheral wall of the portion where the concave portions 11b are provided, the light is diffused in the vertical direction. It becomes like this.

  Therefore, in the region on the outer peripheral side of the partition tube 3, the fluorescence is provided at predetermined intervals in the vertical direction corresponding to the positions where the convex portions 11 a are provided on the outer peripheral surface of the outer tube member 11 of the partition tube 3. Bright portions irradiated with the light emitted from the lamp 18 being condensed are formed, and every predetermined interval in the vertical direction corresponding to the position where each of the concave portions 11b is provided on the outer peripheral surface of the outer cylinder member 11. In addition, a dark portion having a light amount lower than that of the bright portion is formed. Therefore, in the region on the outer peripheral side of the partition tube 3, the bright part and the dark part are alternately formed in the vertical direction.

  As shown in FIG. 3, the focal point f <b> 2 when the peripheral wall of the portion where the convex portions 11 a are provided on the outer peripheral surface of the outer cylindrical member 11 functions as a plano-convex lens surrounds the outer cylindrical member 11. It is desirable to set so that it may be arrange | positioned in the position of the internal peripheral surface (inner side surface) of the tank main body 8 of the culture tank 1 arrange | positioned. In this way, the light collected on the peripheral wall of the outer peripheral surface of the outer cylindrical member 11 where the convex portions 11a are provided passes through the focal point f2 and is mirror-finished as described above. Therefore, when the light diffuses after passing through the focal point f2, the peripheral wall of the portion where the convex portions 11a are provided on the outer peripheral surface of the outer cylinder member 11 The light passes through approximately the same path as the light path toward the corresponding focal point f2 in the opposite direction. For this reason, the area | region of the outer peripheral side of the partition cylinder 3 can gather light more efficiently in the bright part formed for every up-down direction position (height position) in which each convex part 11a of the said outer cylinder member 11 is provided. Thus, the difference in light quantity between the bright part and the dark part can be further increased.

  The vertical arrangement interval of the convex portions 10a and the concave portions 10b provided on the inner peripheral surface of the inner cylinder member 10 of the partition tube 3, and the vertical arrangement of the convex portions 11a and the concave portions 11b provided on the outer peripheral surface of the outer cylindrical member 11 The interval may be set as follows.

  That is, as described above, the culture solution 2 stored in the culture vessel 1 forms a circulating flow in the entire culture solution 2 stored in the culture vessel 1 due to the air lift effect caused by the bubbles of the air 6 blown from the diffusion tube 4. Be made. At this time, from the viewpoint of preventing the local accumulation of the culture solution 2 in the culture tank 1 and the accumulation of microalgae to be cultured, and the culture solution 2 in the culture tank 1 from the aeration tube 4 From the viewpoint of setting the amount of air bubbles to be blown so that excessive bubbling does not occur in the culture solution 2, the flow rate of the circulating flow formed in the culture solution 2 in the culture tank 1 is a certain level. Determined by the range. Therefore, the flow velocity of the upward flow a of the culture solution 2 generated in the inner region of the partition tube 3 with this circulation flow is also determined to some extent.

  Therefore, the vertical arrangement interval between the convex portions 10a and the concave portions 10b provided on the inner peripheral surface of the inner cylinder member 10 of the partition tube 3 is the upward flow a of the culture solution 2 generated in the inner region of the partition tube 3. Accordingly, the microalgae that move at the flow velocity of the upward flow a alternate between the bright and dark portions formed in the region by the convex portions 10a and the concave portions 10b provided on the inner peripheral surface of the inner cylindrical member 10. The time interval when passing through is set as appropriate so as to match the light flashing cycle that gives the optimal flashing light effect (bright reaction, dark reaction cycle effect) for promoting the photosynthesis of the microalgae obtained in advance through experiments, etc. You just have to do it.

  Further, since the flow rate of the circulating flow formed in the culture solution 2 in the culture tank 1 is determined within a certain range as described above, the outer peripheral side of the partition tube 3 is associated with the circulating flow. The flow rate of the descending flow b of the culture solution 2 generated in the region is determined to some extent.

  Therefore, the vertical spacing between the convex portions 11a and the concave portions 11b provided on the outer peripheral surface of the outer cylinder member 11 of the partition tube 3 is the downward flow b of the culture solution 2 generated in the outer peripheral side region of the partition tube 3. Accordingly, the microalgae that move at the flow velocity of the downward flow b alternate between the bright and dark portions formed in the region by the convex portions 11a and the concave portions 11b provided on the outer peripheral surface of the outer cylinder member 11. What is necessary is just to make it set suitably so that the time interval when passing may correspond to the light flickering cycle which gives the flushing light effect optimal for promotion of the photosynthesis of the said micro algae.

  In addition, although not shown in figure, the said culture tank 1 is a common or separate supply line for supplying the seed culture of the microalgae as a photosynthetic organism to be cultured and the culture solution 2, and microalgae are suspended. A culture solution discharge line for taking out the culture solution, an exhaust line, a sample collecting means for taking out the culture solution 2 in which microalgae are suspended in the middle of the culture as a sample, and enabling the culture solution 2 to be observed visually An observation window, a means for measuring the turbidity of the culture solution 2, a temperature adjustment means for adjusting the temperature of the culture solution 2, and further, chemicals and the like necessary for the above-mentioned microalgae cultivation process are supplied to the culture solution 2. It is assumed that equipment for performing operations required in the process of culturing microalgae in the culture tank 1, such as input means for input, is provided.

  When the light irradiation type culture apparatus of the present invention having the above-described configuration is used, the culture tank 1 is supplied with the seed culture of the above-mentioned microalgae to be cultured and the culture solution 2, and the culture tank A culture solution 2 in which the microalgae are suspended is stored in 1, and the partition tube 3 is submerged in the culture solution 2.

  Thereafter, each fluorescent lamp 18 disposed in the internal space 14 of the partition tube 3 is turned on as a light source, and the partition tube 3 is supplied with air 6 pressurized and guided by the air diffuser 4. The air is blown into the culture medium 2 in 1 as bubbles. The air 6 blown into the culture medium 2 causes an air lift effect when rising inside the partition tube 3 as bubbles. Due to the air lift effect, the culture medium 2 in the culture tank 1 becomes an upward flow a inside the partition tube 3 and passes between adjacent tube members 16 on the inside of the partition tube 3 to the inside of the partition tube 3. The flow path as shown by the arrow in FIG. 1 moves from the outside to the outside, becomes a downward flow b on the outer peripheral side of the partition tube 3, and then returns to the inside of the partition tube 3 through the lower side of the partition tube 3. Is circulated as a circulating flow.

  At this time, in the inner region of the partition tube 3, the projections 10 a and the recesses 10 b provided alternately in the vertical direction on the inner peripheral surface of the inner tube member 10 of the partition tube 3, Since the bright part and dark part which condensed and irradiated light are formed in the up-and-down direction alternately, the said fine contained in the culture solution 2 used as the upward flow a in the area | region inside the said partition cylinder 3 Algae receives a flashing light effect (bright reaction, dark reaction cycle effect) by alternately passing through the light and dark parts of the region.

  Moreover, in the area | region of the outer peripheral side of the said partition cylinder 3, the light of each said fluorescent lamp 18 is carried out by the convex part 11a and the recessed part 11b which were alternately provided in the up-down direction by the outer peripheral surface of the outer cylinder member 11 of this partition cylinder 3. Since the bright part and the dark part which are condensed and irradiated are alternately formed in the vertical direction, the fine portion contained in the culture solution 2 which becomes the downward flow b in the outer peripheral side region of the partition tube 3. Algae receives a flashing light effect (bright reaction, dark reaction cycle effect) by alternately passing through the light and dark parts of the region.

  In the partition tube 3, the bright and dark portions alternately arranged in the vertical direction in the inner region and the outer peripheral region are formed in advance, so that the upward flow a and the downward flow b are generated in each region. Regardless of the turbidity of the culture solution 2, the microalgae contained in the culture solution 2 in the upward flow a and the downward flow b receive the above-mentioned flushing light effect and are promoted to grow. .

  Therefore, the microalgae as the photosynthetic organisms suspended in the culture solution 2 have a small amount and the photosynthesis is promoted by the flushing light effect even in the early stage of the culture when the turbidity of the culture solution 2 is low. The For this reason, the growth of the microalgae can be promoted.

  The bright portions formed on the inner and outer peripheral sides of the partition tube 3 are formed by collecting and irradiating the light from the fluorescent lamp 18 that is a light source. For this reason, in each said bright part, even if the quantity of the said micro algae suspended in the said culture solution 2 increases and the turbidity of this culture solution 2 is increasing, the said condensed light is irradiated. Thereby, a bright part can be formed in the deep inside of the culture solution 2 with high turbidity. Therefore, the utilization efficiency of light energy can be improved.

  As described above, according to the light irradiation type culture apparatus of the present invention, the microalgae culture solution 2 has a low turbidity at the initial stage of culture and a state in which the turbidity of the culture solution is increased. Since the growth of the microalgae in the culture solution can be promoted by the flushing light effect, the efficiency of the microalgae can be increased.

  Next, FIG. 4 shows another example of the bright part / dark part alternating forming unit of the illuminating unit 7 having the same configuration as the embodiment of FIGS. 1 to 3 as another embodiment of the present invention.

  That is, the illuminating means 7 shown in FIG. 4 has a plurality of fluorescent lamps 18 at predetermined intervals in the circumferential direction in the inner space 14 of the partition tube 3 having a hollow double tube structure, as in the case shown in FIGS. Are formed on the inner peripheral surface of the inner cylinder member 10 and the outer peripheral surface of the outer cylinder member 11 as the light and dark portion alternating forming means, respectively, as convex portions 10a, 11a and concave portions 10b, In place of the configuration in which 11b is alternately arranged at predetermined intervals in the vertical direction, the inner cylinder member 10 is continuously provided in the circumferential direction on the outer peripheral surface facing the inner space 14 of the partition cylinder 3. An outer periphery of the inner cylinder member 10 is provided with a convex portion 10c protruding to the side away from the shaft center and a concave portion 10d recessed continuously to the side close to the shaft center in the vertical direction at predetermined intervals. The cross section of the surface is wavy in the vertical direction.

  Further, the outer cylinder member 11 is formed on the inner peripheral surface facing the inner space 14 of the partition cylinder 3 by a convex portion 11c continuously protruding in the circumferential direction toward the axial center side and continuously from the axial center in the circumferential direction. Concave portions 11d that are recessed toward the separating side are provided at predetermined intervals in the vertical direction so that the cross section of the inner peripheral surface of the outer cylinder member 11 has a wave shape in the vertical direction.

  The inner peripheral surface of the inner cylindrical member 10 and the outer peripheral surface of the outer cylindrical member 11 are simple cylindrical surfaces having no irregularities.

  Other configurations are the same as those shown in FIGS. 1 to 3, and the same components are denoted by the same reference numerals.

  According to the bright part dark part alternate forming means in the illumination means 7 of the present embodiment having the above-described configuration, the peripheral wall of the portion where each convex part 10c is provided on the outer peripheral surface in the vertical direction of the inner cylinder member 10 of the partition cylinder Functions as a plano-convex lens extending in the circumferential direction, and can condense the light from the fluorescent lamp 18 toward a focal point f1 existing in a plane including the apex of each convex portion 10c.

  On the other hand, the peripheral wall of the portion where the concave portions 10d are provided on the outer peripheral surface in the vertical direction of the inner cylinder member 10 of the partition tube functions as a plano-concave lens extending in the circumferential direction, and diffuses the light from the fluorescent lamp 18 in the vertical direction. Can be made.

  Also in the outer cylinder member 11 of the partition tube, the peripheral wall of the portion where the convex portions 11c are provided on the inner peripheral surface functions as a plano-convex lens extending in the circumferential direction, and the light from the fluorescent lamp 18 is transmitted to the convex portions. The light can be condensed toward the focal point f2 existing in the plane including the vertex of the portion 11c.

  On the other hand, the peripheral wall of the portion where each concave portion 11d is provided on the inner peripheral surface in the vertical direction of the outer cylinder member 11 of the partition tube functions as a plano-concave lens extending in the circumferential direction, and allows the light from the fluorescent lamp 18 to move in the vertical direction. Can be diffused.

  Therefore, by transmitting the light from the fluorescent lamp 18 through the inner tube member 10, the inner region of the partition tube 3 corresponds to the vertical arrangement of the protrusions 10c and the recesses 10d in the inner tube member 10. Thus, the bright portions and the dark portions irradiated with the light from the fluorescent lamp 18 condensed are formed alternately in the vertical direction.

  Further, by allowing the light from the fluorescent lamp 18 to pass through the outer cylinder member 11, the convex portion 11 c and the concave portion 11 d of the outer cylinder member 11 are arranged in the vertical direction in the region on the outer peripheral side of the partition tube 3. Correspondingly, bright portions and dark portions, which are collected and irradiated with the light from the fluorescent lamp 18, are alternately formed in the vertical direction.

  Accordingly, as in the embodiment of FIGS. 1 to 3, the culture solution 2 in the culture tank 1 becomes an upward flow a inside the partition tube 3, and an adjacent cylinder member above the partition tube 3. It moves from the inside of the partition cylinder 3 to the outside through the space between 16 and becomes a downward flow b on the outer peripheral side of the partition cylinder 3, and then returns to the inside of the partition cylinder 3 through the lower side of the partition cylinder 3. The return flow path is circulated as a circulation flow. In the meantime, in the inner region of the partition tube 3 and the outer peripheral region, the microalgae contained in the culture solution 2 that becomes the upward flow a and the downward flow b, respectively, A flashing light effect (bright reaction, dark reaction cycle effect) can be provided by alternately passing the light part and the dark part.

  Therefore, according to this embodiment, the same effect as that of the embodiment shown in FIGS. 1 to 3 can be obtained.

  Further, the partition tube 3 has no irregularities on the inner peripheral surface of the inner tube member 10 that contacts the culture solution 2 and the outer peripheral surface of the outer tube member 11 that contacts the culture solution 2. For this reason, in the partition tube 3, the flow of the culture solution 2 in contact with the inner peripheral surface of the inner cylinder member 10 and the flow of the culture solution 2 on the side in contact with the outer peripheral surface of the outer cylinder member 11 are not disturbed. The culture medium 2 can be circulated more smoothly in the culture tank 1, and in order to form the circulation flow, it is necessary to blow into the culture medium 2 from the air diffuser 4 (see FIG. 1) as bubbles. The amount of air 6 used can be reduced.

  Next, FIG. 5 shows another example of the bright part / dark part alternating forming unit of the illuminating unit 7 having the same configuration as the embodiment of FIGS. 1 to 3 as still another embodiment of the present invention.

  That is, the illuminating means 7 in the present embodiment has a plurality of fluorescent lamps at predetermined intervals in the circumferential direction in the inner space 14 of the partition tube 3 having a hollow double tube structure, similar to the one shown in FIGS. In the configuration in which 18 is housed, as the bright and dark portion alternate forming means, the convex portions 10a and 11a and the concave portion 10b are formed on the inner peripheral surface of the inner cylinder member 10 and the outer peripheral surface of the outer cylinder member 11, respectively. , 11b are alternately arranged at predetermined intervals in the vertical direction, and the inner cylinder member 10 and the outer cylinder member 11 of the partition cylinder 3 have a simple cylindrical shape with no irregularities. Further, reflecting members 20a and 20b having a band shape with a predetermined width, which will be described later, and having at least one surface as a reflecting surface 21 such as a mirror surface, are provided at a plurality of predetermined intervals in the vertical direction of the inner cylinder member 10 and the outer cylinder member 11. The reflection surface 21 is attached to the entire circumference in the circumferential direction, which is the horizontal direction, with the posture facing the inside of the internal space 14 of the partition tube 3. At this time, the reflecting members 20a arranged in the vertical direction on the inner cylinder member 10 and the reflecting members 20b arranged in the vertical direction on the outer cylinder member 11 are alternately arranged in the vertical direction. To be arranged.

  In addition, each said reflecting member 20a, 20b does not produce influence on the flow of the circulating flow of the culture solution 2 in the culture tank 1, and the reflecting surface 21 of each said reflecting member 20a, 20b. From the viewpoint of preventing dirt, as shown in FIG. 5, the inner cylinder member 10 is attached to the outer peripheral surface facing the inner space 14 of the partition cylinder 3, and the outer cylinder member 11 is inside the partition cylinder 3. It is desirable to attach to the inner peripheral surface facing the space 14.

  In addition, the reflection member 20a and 20b are the structure which attaches the said reflection member 20a to the internal peripheral surface of the said inner cylinder member 10, or the said reflection member 20b in the outer peripheral surface of the said outer cylinder member 11 about one or both. Of course, it is possible to adopt a mounting configuration.

  As a result, the inner cylinder member 10 is formed with slits 22a through which light can pass between adjacent ones of the reflecting members 20a arranged in the vertical direction and adjacent to each other in the vertical direction. . The slits 22a of the inner cylinder member 10 are emitted from the fluorescent lamps 18 provided in the internal space 14 of the partition cylinder 3 and then emitted directly from the fluorescent lamps 18 to the slits 22a. After the reflected light is reflected by the reflecting surface 21 of each reflecting member 20b attached to the outer cylinder member 11, the reflected light toward the slit 22a of the inner cylinder member 10 is condensed and transmitted through the slit 22a. Thus, the region inside the partition tube 3 is irradiated.

  Therefore, a bright portion where the light from the fluorescent lamp 18 is condensed and irradiated is formed in the inner region of the partition tube 3 at every height position where each slit 22a of the inner tube member 10 is provided. Then, a dark portion where the light of the fluorescent lamp 18 is blocked by the reflecting member 20a attached to the inner cylinder member 10 is formed between the bright portions.

  The outer cylinder member 11 is formed with slits 22b through which light can pass between the reflecting members 20b arranged in the vertical direction and adjacent to each other in the vertical direction. The slits 22b of the outer cylinder member 11 are emitted from the fluorescent lamps 18 provided in the internal space 14 of the partition tube 3 and then emitted directly from the fluorescent lamps 18 to the slits 22b. After the reflected light is reflected by the reflecting surface 21 of each reflecting member 20a attached to the inner cylinder member 10, the reflected light toward the slit 22b of the outer cylinder member 11 is condensed and transmitted through the slit 22b. Thus, the region on the outer peripheral side of the partition tube 3 is irradiated.

  Therefore, the light from the fluorescent lamp 18 is condensed and irradiated on the outer peripheral side region of the partition tube 3 at each height position where the slits 22b of the outer tube member 11 are provided in the vertical direction. A bright part is formed, and a dark part where the light from the fluorescent lamp 18 is blocked by the reflecting member 20b attached to the outer cylinder member 11 is formed between the bright parts.

  By the way, the vertical arrangement interval of the slits 22 a of the inner cylinder member 10 and the vertical arrangement interval of the slits 22 b of the outer cylinder member 10 are the reflections attached to the inner cylinder member 10 and the outer cylinder member 11. It is determined according to the width dimension of the members 20a and 20b.

  Therefore, the width dimension of each of the reflecting members 20a and 20b is determined by the vertical arrangement interval of the slits 22a of the inner cylinder member 10 and the slits 22b of the outer cylinder member 11 in the embodiment shown in FIGS. What is necessary is just to set so that it can be set as the arrangement | positioning space | interval similar to the arrangement space | interval of the up-down direction of each convex part 10a, 11a provided in the inner cylinder member 10 and the outer cylinder member 11 of the partition cylinder 3, respectively.

  In addition, in this Embodiment, since the reflection member 20a attached to the said inner cylinder member 10 and the reflection member 20b attached to the said outer cylinder member 11 are arrange | positioned alternately at an up-down direction, about the said culture tank 1, The flow path cross-sectional area of the culture solution 2 in the inner region of the partition tube 3 and the flow channel cross-sectional area of the culture solution 2 in the outer peripheral side region of the partition tube 3 are designed to be substantially the same. The flow rate of the upward flow a of the culture solution 2 generated in the inner region of the partition tube 3 is substantially the same as the flow rate of the downward flow b of the culture solution 2 generated in the outer peripheral region of the partition tube 3. .

  For convenience of illustration, FIG. 5 shows a bent path when the light emitted from the fluorescent lamp 18 is reflected by the reflecting surface 21 of each reflecting member 20a, 20b.

  Other configurations are the same as those shown in FIGS. 1 to 3, and the same components are denoted by the same reference numerals.

  Also by the bright part dark part alternate forming means in the illumination means 7 of the present embodiment having the above-described configuration, the light part where the light from the fluorescent lamp 18 is condensed and irradiated on the inner region of the partition tube 3. And dark portions can be alternately formed in the vertical direction, and in the region on the outer peripheral side of the partition tube 3, a bright portion and a dark portion where the light from the fluorescent lamp 18 is condensed and irradiated Can be alternately formed in the vertical direction.

  Therefore, as in the embodiment of FIGS. 1 to 3, when the culture medium 2 in the culture tank 1 is circulated, it rises in the inner region of the partition tube 3 and the outer peripheral region, respectively. Flushing light effect (bright reaction, dark reaction cycle) by passing the bright part and the dark part of each region alternately for the microalgae contained in the culture solution 2 that becomes the flow a and the downward flow b Effect).

  Therefore, the present embodiment can provide the same effects as those of the embodiment of FIGS. 1 to 3.

  FIG. 6 shows an example in which a light source is provided outside the culture tank as still another embodiment of the present invention.

  That is, the light irradiation type culture apparatus of the present embodiment uses a tank body 23 made of a light-transmitting material as the tank body 23 of the culture tank 1a.

  A partition cylinder 24 made of a light-transmitting material and having a simple cylindrical shape extending in the vertical direction is disposed at the center of the culture tank 1a. The partition tube 24 is configured to attach and support the upper end portions of the column members 25 attached to a plurality of locations in the circumferential direction at the upper end portion on the lower surface side of the lid 9 of the culture tank 1a.

  Moreover, the light irradiation type culture apparatus of this embodiment uses a plurality of fluorescent lamps 18 in the vertical direction at predetermined intervals in the circumferential direction as the light source of the illumination means 7a at the outer peripheral position of the tank body 23 of the culture tank 1a. Place in an extended posture. Each fluorescent lamp 18 is assumed to be held by a holder (not shown) for supplying power to each fluorescent lamp 18.

  Furthermore, the light irradiation type culture apparatus of the present embodiment is a peripheral portion in the horizontal direction on the outer peripheral surface of the side wall portion of the light-transmitting tank body 23 as the light / dark portion alternating forming means provided in the illumination means 7a. Convex portions 23a projecting toward the side away from the axial center continuously in the direction and concave portions 23b recessed toward the side adjacent to the axial center continuously in the circumferential direction are alternately provided in the vertical direction, and the tank body 23 The cross-section of the outer peripheral surface of this is a wave shape in the vertical direction.

  Thereby, the peripheral wall of the part in which each said convex part 23a is provided in the outer peripheral surface in the up-down direction of the said tank main body 23 becomes a plano-convex lens continuous in the circumferential direction. For this reason, when the light emitted from the fluorescent lamp 18 passes through the peripheral wall of the portion where each convex portion 23a is provided, the light is emitted from both the upper and lower sides toward the focal point existing on the horizontal plane including the apex of each convex portion 23a. It will be condensed.

  On the other hand, the peripheral wall of the portion where the concave portions 23b are provided on the outer peripheral surface in the vertical direction of the tank body 23 is a plano-concave lens that is continuous in the circumferential direction. For this reason, when the light emitted from the fluorescent lamp 18 passes through the peripheral wall of the portion where the concave portions 10b are provided, the light is diffused in the vertical direction.

  In the present embodiment, the light of the fluorescent lamp 18 that is condensed when passing through the peripheral wall of the outer peripheral surface of the tank body 23 where the convex portions 23a are provided has the light transmittance. After further passing through the peripheral wall of the partition tube 24, the focal point is set so as to focus on the axial center position of the partition tube 24 in the horizontal plane including the apex of each convex portion 23 a.

  Thereby, when the light irradiation type culture apparatus of this Embodiment lights each fluorescent lamp 18 of the said illumination means 7a, with respect to the area | region inside the partition cylinder 24 in the said culture tank 1a, and the area | region of an outer peripheral side, For each height position where each convex portion 23 a is provided on the outer peripheral surface of the tank body 23, a bright portion where the light from the fluorescent lamp 18 is condensed can be formed, and each concave portion 23 b is formed on the outer peripheral surface of the tank main body 23. It becomes possible to form a dark part at every height position provided with. Therefore, bright and dark portions are alternately formed in the vertical direction in the inner region and the outer peripheral region of the partition tube 24 in the culture tank 1a.

  In the present embodiment, the vertical arrangement interval of the convex portions 23a provided on the outer peripheral surface of the tank body 23 is the same as the inner cylinder member 10 and the outer cylinder of the partition cylinder 3 in the embodiment of FIGS. What is necessary is just to set so that it can be set as the arrangement | positioning space | interval similar to the arrangement | positioning space | interval of the up-down direction of each convex part 10a provided in the member 11 respectively.

  In the case of the present embodiment, as in the case of the embodiment of FIG. 5, the flow rate of the upward flow a of the culture solution 2 generated in the inner region of the partition tube 24 and the outer periphery of the partition tube 24 It is assumed that the flow rate of the descending flow b of the culture solution 2 generated in the side region is substantially the same.

  Other configurations are the same as those shown in FIGS. 1 to 3, and the same components are denoted by the same reference numerals.

  According to the light irradiation type culture device of the present embodiment having the above-described configuration, the culture solution 2 to be circulated in the culture tank 1a has an upward flow a and a region on the inner side and the outer peripheral side of the partition tube 24, respectively. When flowing as a downward flow b, a flushing light effect (bright reaction, dark reaction cycle effect) can be given to the microalgae in the culture solution 2 that alternately pass through the bright part and the dark part.

  Therefore, the present embodiment can provide the same effects as those of the embodiment of FIGS. 1 to 3.

  In addition, this invention is not limited only to the said embodiment, The diameter size and height of the culture tanks 1 and 1a, and the diameter dimension of the partition cylinders 3 and 24 provided in this culture tank 1 and 1a The heights are convenient dimensions and shapes for illustration, and do not reflect actual dimensions or shapes.

  1 to 3 and the projections 10a and 11a and the recesses 10b and 11b provided on the inner cylinder member 10 and the outer cylinder member 11 of the partition cylinder 3 in the embodiment of FIG. In the embodiment, the curvatures of the protrusions 23a and the recesses 23b provided in the tank body 23 of the culture tank 1a, the arrangement interval in the vertical direction, and the number of arrangements are all for convenience of illustration, and are actual devices. It does not reflect the composition of

  Moreover, as an application example of the embodiment of FIGS. 1 to 3 and the embodiment of FIG. 4, the convex portions 10 a, 10 a are formed on the inner peripheral surfaces of both the inner cylinder member 10 and the outer cylinder member 11 of the partition cylinder 3. 11c and recesses 10b and 11d are alternately provided in the vertical direction, or convex parts 10c and 11a and recesses 10d and 11b are alternately provided in the vertical direction on the outer peripheral surfaces of both the inner cylinder member 10 and the outer cylinder member 11. You may employ | adopt the structure made into.

  Furthermore, the inner cylinder member 10 and the outer cylinder member 11 of the partition cylinder 3 are provided with convex portions and concave portions alternately arranged in the vertical direction on the both surfaces of the inner peripheral surface and the outer peripheral surface in the same phase. It is good also as a structure formed by alternately forming the part which functions as a biconvex lens and the part which functions as a biconcave lens in the surrounding wall of the cylinder member 10 and the outer cylinder member 11 in the up-down direction.

  In the embodiment of FIG. 6, a configuration may be adopted in which convex portions and concave portions 10 are alternately provided in the vertical direction on the inner peripheral surface of the tank body 23 of the culture tank 1 a or on both the inner peripheral surface and the outer peripheral surface.

  The number of fluorescent lamps 18 arranged in the circumferential direction by the illumination means 7 and 7a depends on the intensity of light required for culturing photosynthetic organisms to be cultured in the culture tanks 1 and 1a and the culture tanks 1 and 1a. You may change suitably according to the size.

  The light irradiation type culture apparatus of the present invention is applicable to culturing any photosynthetic organism other than microalgae as long as it is a photosynthetic organism that can be cultured in a state suspended in the culture solution 2 stored in the culture tank 1. May be.

  Further, gas other than air may be used as the gas in order to blow bubbles into the culture solution 2 from the diffuser tube 4 in correspondence with the photosynthetic organism to be cultured.

  Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Culture tank 2 Culture solution 3 Partition cylinder 4 Aeration pipe 6 Air (gas)
7, 7a Illumination means 18 Fluorescent lamp (light source)
22a, 22b Slit 24 Partition tube

Claims (4)

  A culture tank for storing a culture solution in which photosynthetic organisms are suspended; a light-transmitting partition provided inside the culture tank; and a gas bubble provided below a lower end opening of the partition cylinder. A diffuser tube for blowing into the culture solution stored in the culture tank, and illumination means for illuminating the culture solution in the culture tank, and the illumination means are provided on the inner region and the outer peripheral side of the partition tube A light irradiation type culture apparatus characterized in that a bright part and a dark part for condensing and irradiating illumination light from a light source are alternately arranged in a vertical direction in a region.   The illuminating means comprises a light source that irradiates illumination light to the inner region and the outer peripheral region of the partition tube, and bright / dark portion alternating forming means disposed on the side of the light source facing the culture solution. Item 4. The light irradiation type culture apparatus according to Item 1.   The light irradiation type culture apparatus according to claim 2, wherein the light part dark part alternating means is provided with convex lenses or slits arranged in the vertical direction.   On the wall surfaces of the inner cylinder member and the outer cylinder member of the partition cylinder as a hollow double cylinder structure having an inner space for storing a light source between the inner cylinder member and the outer cylinder member. The light irradiation type culture apparatus according to claim 3, wherein a plurality of convex lenses or slits extending in the horizontal direction are arranged in the vertical direction.

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