Microalga culturing apparatus to be mounted on wall surface of structure, enabling easy detachment of microalga

Abstract

The present invention relates to a microalga culturing apparatus to be mounted on a wall surface of a structure and to a microalga culturing apparatus which enables easy detachment of a microalga attached to the inner surface of a photosynthesis reactor, allows the cultured microalga to be easily harvested, and further enables increased usability.

Description

Microalgae cultivation device for mounting on the wall of a structure that allows easy attachment and detachment of microalgae

[0001] The present invention relates to a microalgae cultivation device mounted on a wall surface of a structure, and relates to a device for cultivating microalgae through photosynthesis inside a photosynthetic reactor by supplying sunlight and carbon dioxide while water and microalgae are placed inside a photosynthetic reactor mounted on a wall surface of a structure, and relates to a microalgae cultivation device that allows easy detachment of microalgae attached to the inner surface of the photosynthetic reactor, allows easy harvesting of cultured microalgae, and further increases the usability of the microalgae cultivation device.

[0002]

[0003] This invention was developed with the support of the National Research and Development Project (Project Unique Number: 2023000762, Project Number: 20025639, Ministry of Trade, Industry and Energy, Project Management (Specialized) Agency: Korea Institute of Industrial Technology Evaluation and Planning (KEIT), Research Project Name: Industrial Technology Alchemist Project, Research Project Name: Development of a Small Modular DAC System for CO2 Supply to Urban Plant Factories and Blue-Green Hydrogen Production Technology Using Microalgae, Contribution Rate: 1 / 1, Project Implementing Agency: Pohang University of Science and Technology Industry-Academic Cooperation Foundation, Research Period: 2023.04.01 ~ 2024.12.31).

[0004] As the natural environment is diminished due to industrial development and population growth, abnormal climate phenomena such as global warming, the urban heat island phenomenon, and concentrated heavy rain are gradually increasing, and environmental diseases such as atopy are on the rise.

[0005] Accordingly, the government is actively intervening at the national level by enacting the Parks and Green Spaces Act, which requires that plans to secure urban parks or green spaces be included in development plans involving development of a certain scale or larger to improve the environment. However, in areas where development was already completed before the enactment of the law, it is difficult to secure additional green spaces.

[0006] To address these issues, prior art, Republic of Korea Utility Model Registration No. 20-0458027, discloses technical features of various planting containers that enable plants to be grown in the outdoor environment of a building.

[0007] However, this is a planting container for plants planted on soil, so it can only be applied to rooftops due to concerns about soil runoff, and it has limitations in that it requires periodic maintenance.

[0008]

[0009] Meanwhile, although microalgae are not widely distributed as green plants, they absorb carbon dioxide and emit oxygen through photosynthesis when growing. Therefore, through the process of cultivating such microalgae, carbon dioxide, which is the main culprit of climate warming in cities, can be effectively removed and the air purified at the same time. Furthermore, the cultured microalgae can be harvested and used in everyday products such as biomass and cosmetics. Recently, research on microalgae cultivation devices has been emerging to solve the above-mentioned problems.

[0010] Looking at the prior art, Korean Patent Publication No. 10-2022-0068751, the prior art relates to a building facade microalgae culture panel that is easy to cultivate and recover microalgae, and discloses technical features of the building facade microalgae culture panel including a plurality of brackets that can be attached to the exterior wall of a building, and a culture tank that is slidably inserted between a pair of adjacent brackets and has an openable culture space provided inside.

[0011]

[0012] However, after culturing microalgae for a long period of time, there is a concern that some microalgae may attach and become fixed on the inside of the photosynthetic reactor, which is a culture tank. However, the prior art does not disclose a technical feature that can detach this. As disclosed in the prior art, detachment can be performed using a separate detachment means while the photosynthetic reactor is open, but during the detachment process, the water and microalgae located inside the photosynthetic reactor must be completely discharged to the outside. Therefore, the photosynthetic reactor must always be opened during detachment, which is cumbersome and inevitably significantly reduces its efficiency.

[0013] Furthermore, the prior art discloses a technical feature of harvesting microalgae in an open photosynthetic reactor, but when the photosynthetic reactor is open, water and cultured microalgae are discharged simultaneously, so a separate process of separating the discharged water and microalgae must be performed, and since the water that has already been discharged and separated cannot be reused, the efficiency of the microalgae cultivation device is bound to be significantly reduced.

[0014] Furthermore, since the prior art microalgae cultivation device only discloses the technical feature that it can be attached to the exterior wall of a building, only the technical feature that limits the usability of the microalgae cultivation device is disclosed.

[0015]

[0016] In order to solve the problems of the above-described prior art, the present invention provides a microalgae cultivation device that can easily detach microalgae attached to the inner surface of a photosynthetic reactor even when water and microalgae are positioned inside the photosynthetic reactor, efficiently harvest microalgae while simultaneously reusing the separated water, and further increases usability.

[0017]

[0018] In order to solve the problems of the prior art described above, the microalgae cultivation device for mounting on the wall of a structure according to the present invention comprises: a photosynthetic reactor (100) coupled to the outer wall of a structure; a microalgae cultivation device for mounting on the wall of a structure including water and microalgae located in the inner space of the photosynthetic reactor (100);

[0019] It may further include an inner magnet (150) positioned in the inner space of the photosynthetic reactor (100).

[0020]

[0021] Preferably, the photosynthetic reactor (100) includes a frame (110) coupled to the outer wall of the structure and a front side plate (120) and a back side plate (140) made of a transparent material coupled to the frame (110).

[0022] The inner magnet (150) can be positioned so as to be movable in the inner space of the photosynthetic reactor (100) formed by the front side plate (120) and the back side plate (140).

[0023]

[0024] Preferably, the inner magnet (150) can be positioned so as to be movable in the inner space of the photosynthetic reactor (100) while one side of the inner magnet (150) is in contact with the inner side of the front side plate (120) and the other side of the inner magnet (150) is in contact with the inner side of the back side plate (140).

[0025]

[0026] Preferably, pads (152) are mounted on one side and the other side of the inner magnet (150),

[0027] The inner magnet (150) can be positioned so as to be movable in the inner space of the photosynthetic reactor (100) while the pad (152) mounted on one side of the inner magnet (150) is in contact with the inner side of the front side plate (120) and the pad (152) mounted on the other side of the inner magnet (150) is in contact with the inner side of the back side plate (140).

[0028]

[0029] Preferably, it further includes a robot (200) that moves while attached to the outer surface of the front side plate (120) or the outer surface of the back side plate (140).

[0030] By the magnetic force between the outer magnet (220) and the inner magnet (150) mounted on the robot (200), the inner magnet (150) moves in the inner space of the photosynthetic reactor (100) according to the movement of the robot (200).

[0031] A brush (154) is mounted on the edge of one side and the edge of the other side of the inner magnet (150).

[0032] Among the above frames (110), a plurality of gas flow holes (112) through which oxygen flows out and carbon dioxide flows in can be formed in the upper frame (110).

[0033]

[0034] By means of the above-described problem-solving means, even when water and microalgae are positioned inside the photosynthetic reactor, the microalgae attached to the inside of the photosynthetic reactor can be detached by moving a magnet equipped with a pad or brush, thereby minimizing the hassle of detaching the attached microalgae. Accordingly, the operational efficiency of the microalgae cultivation device can be increased.

[0035] Furthermore, the water and cultured microalgae located inside the photosynthetic reactor are separated into water and microalgae as they are discharged to the outside, and the separated water is then fed back into the photosynthetic reactor, thereby minimizing waste of resources during the separation process of water and microalgae and maximizing the efficiency of operation of the microalgae cultivation device.

[0036] Furthermore, since the microalgae cultivation device is utilized not only in buildings but also in structures such as bus stops, and the electricity required to cultivate microalgae in the microalgae cultivation device can be supplied by electricity generated by solar panels mounted on the structure, the microalgae cultivation device can be operated energy-efficiently and the usability of the microalgae cultivation device can be increased at the same time.

[0037]

[0038] Figure 1 is a drawing showing a state in which a microalgae cultivation device according to the present invention is installed in a building.

[0039] FIG. 2 and FIG. 3 are schematic drawings of a photosynthetic reactor equipped with components necessary for detaching adherent microalgae from a microalgae cultivation device according to the present invention.

[0040] Figures 4 and 5 are schematic drawings showing the components necessary for separating water and microalgae while discharging them in a microalgae cultivation device according to the present invention.

[0041] Figure 6 is a schematic drawing showing a state in which a microalgae cultivation device according to the present invention is installed at a bus stop.

[0042]

[0043] Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings. Throughout this process, the thickness of lines and the sizes of components depicted in the drawings may be exaggerated for clarity and convenience. Furthermore, the terms described below are defined based on their functions in the present invention and may vary depending on the intent or custom of the user or operator. Therefore, the definitions of these terms should be based on the overall content of this specification.

[0044]

[0045] This is explained with reference to Figures 1 to 6.

[0046] The microalgae cultivation device for mounting on a wall of a structure according to the present invention may include a photosynthetic reactor (100) and water and microalgae positioned inside the photosynthetic reactor (100).

[0047] As photosynthesis proceeds in microalgae using water, light, and carbon dioxide inside the photosynthetic reactor (100), oxygen is generated and the microalgae grow.

[0048] Any light capable of photosynthesizing microalgae may be used, but sunlight is preferred. Carbon dioxide collected separately from a greenhouse gas reduction device may be supplied to the photosynthetic reactor (100), or carbon dioxide contained in the air may be supplied.

[0049] It goes without saying that the oxygen produced by the photosynthetic action of microalgae can be supplied to the living environment, and that the cultured and harvested microalgae can be used as biomass and as raw materials for other everyday products such as cosmetics.

[0050]

[0051] This is explained with reference to Figures 2 and 3.

[0052] The photosynthetic reactor (100) may include a frame (110) coupled to the outer wall of the structure, and a front side plate (120) and a back side plate (140) coupled to the frame (110). As the front side plate (120) and the back side plate (140) are coupled to the frame (110) at a constant interval, a constant space is formed between the front side plate (120) and the back side plate (140), and water and microalgae can be positioned in the space thus formed. It goes without saying that the front side plate (120) and the back side plate (140) may be composed of a transparent material that allows light to pass through.

[0053] Furthermore, a fine gas flow hole (112) may be formed in the upper frame (110) of the frame (110). Through this gas flow hole (112), external carbon dioxide may flow into the inner space of the photosynthetic reactor (100), and oxygen generated by photosynthesis may flow out to the outside.

[0054] Microalgae grow through photosynthesis in the inner space of the photosynthetic reactor (100) formed by the front side plate (120) and the back side plate (140). As the microalgae grow, the density of the microalgae increases, and the microalgae may attach to the inner surface of the photosynthetic reactor (100) (the inner surface of the front side plate (120) or the back side plate (140)). There is a risk that the attached microalgae may stick to the inner surface of the photosynthetic reactor (100) without being discharged to the outside.

[0055] In order to resolve the state of fixation of microalgae, an inner magnet (150) is positioned movably in the inner space of a photosynthetic reactor (100) formed by a front side plate (120) and a back side plate (140) so that microalgae attached to the inner surface of the photosynthetic reactor (100) can be detached.

[0056] Specifically, the gap between the inner surface of the front side plate (120) and the inner surface of the back side plate (140) may be about 1 to 5 cm, and an inner magnet (150) having a length corresponding to this gap may be positioned between the inner surface of the front side plate (120) and the inner surface of the back side plate (140).

[0057] In this state, one side of the inner magnet (150) may be in contact with the inner side of the front side plate (120), and the other side may be in contact with the inner side of the back side plate (140). Alternatively, in a state where a detachable pad (152) is mounted on one side and the other side of the inner magnet (150), the pad (152) mounted on one side may be in contact with the inner side of the front side plate (120), and the pad (152) mounted on the other side may be in contact with the inner side of the back side plate (140).

[0058] As the inner magnet (150) in this state moves in the inner space of the photosynthetic reactor (100), pressure can be applied to the microalgae attached to the inner surface of the front side plate (120) and the inner surface of the back side plate (140), thereby detaching the microalgae.

[0059] In order to increase the efficiency of detaching microalgae attached to the inner surface of the photosynthetic reactor (100), a brush (154) may be mounted on the edge of one side and the edge of the other side of the inner magnet (150). As the inner magnet (150) moves in the inner space of the photosynthetic reactor (100), the attached microalgae may be detached as the one side and the other side of the inner magnet (150) or the pad (152) and further the brush (154) come into contact with the inner surface of the photosynthetic reactor (100).

[0060] The microalgae cultivation device according to the present invention may further include a robot (200) that is moved while attached to the outer surface of the photosynthetic reactor (100), that is, the outer surface of the front side plate (120) or the outer surface of the back side plate (140), in order to move the inner magnet (150) located in the inner space of the photosynthetic reactor (100).

[0061] The robot (200) may be equipped with an air chamber, and the robot (200) may be moved while attached to the outer surface of the front side plate (120) or the outer surface of the back side plate (140) in a state where the pressure between the robot (200) and the outer surface of the front side plate (120) or the outer surface of the back side plate (140) is maintained lower than the atmospheric pressure by the operation of the motor included in the air chamber.

[0062] The robot (200) may be equipped with an outer magnet (220). Accordingly, as the robot (200) moves along the outer surface of the photosynthetic reactor (100), the inner magnet (150) positioned in the inner space of the photosynthetic reactor (100) may move due to the magnetic force between the inner magnet (150) positioned in the inner surface of the photosynthetic reactor (100) and the outer magnet (220) positioned in the outer surface of the photosynthetic reactor (100). As the inner magnet (150) moves in the inner space of the photosynthetic reactor (100), one side and the other side of the inner magnet (150) or the pad (152) and the brush (154) may move in contact with the inner surface of the photosynthetic reactor (100), thereby applying pressure to the attached microalgae.

[0063] In order to clarify the explanation of other technical features, technical features capable of detaching microalgae attached to the inner surface of the photosynthetic reactor (100) are not illustrated in FIGS. 1, 4, and 6. However, it is obvious that technical features capable of detaching microalgae attached to the inner surface of the photosynthetic reactor (100) can be applied in addition to the technical features illustrated in FIGS. 1, 4, and 6.

[0064]

[0065] The technical features of harvesting microalgae cultured in a photosynthetic reactor (100) are described with reference to FIGS. 4 and 5.

[0066] A plate inlet pipe (124) is mounted on the upper part of the front side plate (120), and an inlet valve (123) can be mounted on this plate inlet pipe (124). A plate discharge pipe (122) is mounted on the lower part of the front side plate (120), and a discharge valve (121) can be mounted on this plate discharge pipe (122). Water and cultured microalgae can be discharged through the plate discharge pipe (122) on the lower part of the front side plate (120), and the discharged water and microalgae are separated while passing through a solid-liquid separator (300) to be described later, and the separated water can be pumped and fed back into the plate inlet pipe (124) on the upper part of the front side plate (120).

[0067] During the process of culturing microalgae through photosynthesis, the inlet valve (123) and the discharge valve (121) may be closed, and when the microalgae have been cultured to a certain extent in the photosynthetic reactor (100) and need to be harvested, the discharge valve (121) is opened so that the microalgae and water cultured inside the photosynthetic reactor (100) are discharged to the plate discharge pipe (122), and the water separated from the microalgae through the open inlet valve (123) is introduced back into the photosynthetic reactor (100) so that it can be recycled.

[0068] In a state where the plate discharge pipe (122) is positioned on one side of the lower portion of the front side plate (120), the plate inlet pipe (124) is positioned on the other side of the upper portion of the front side plate (120), but can be positioned diagonally symmetrically with respect to one side of the lower portion of the front side plate (120) where the plate discharge pipe (122) is positioned, with the center of the front side plate (120) as the center.

[0069] When harvesting microalgae, the water separated from the microalgae is circulated so that it flows through the entire inner side of the photosynthetic reactor (100) as much as possible after flowing into the plate inlet pipe (124) and is then discharged through the plate outlet pipe (122), so that all microalgae remaining in the inner space of the photosynthetic reactor (100) are discharged to the outside through the plate outlet pipe (122). That is, when the plate outlet pipe (122) and the plate inlet pipe (124) are located on the same side, water flows directly from top to bottom due to gravity, and thus flows without passing through the microalgae located on the other side that have not yet been discharged, so that the microalgae located on the other side are not swept away by the water and discharged to the outside, but are still left in the inner space of the photosynthetic reactor (100). When the plate inlet pipe (124) is positioned on the other side and the plate discharge pipe (122) is positioned on one side diagonally thereto, water introduced into the plate inlet pipe (124) flows to the other side of the inner space of the photosynthetic reactor (100) and then flows to one side, so that water introduced into the plate inlet pipe (124) can pass through most of the inner space of the photosynthetic reactor (100) and be discharged. Accordingly, microalgae left on one side or the other side can be swept away by the flowing water and discharged to the outside.

[0070] The microalgae cultivation device according to the present invention may further include a solid-liquid separator (300) configured to discharge and flow water and microalgae located in the inner space of the photosynthetic reactor (100) while being connected to the upper and lower portions of the front side plate (120), respectively.

[0071] Water and microalgae located in the inner space of the photosynthetic reactor (100) flow into the solid-liquid separator (300) through the plate discharge pipe (122), and water and microalgae can be separated while passing through the solid-liquid separator. As described above, the separated water flows back into the plate inlet pipe (124) and is introduced into the photosynthetic reactor (100) to be recycled.

[0072] The solid-liquid separator (300) may include a separation discharge pipe (322) connected to a plate discharge pipe (122) at the bottom of the front side plate (120), a separation inlet pipe (324) connected to a plate inlet pipe (124) at the top of the front side plate (120), a solid-liquid separation body (350) connected to the separation discharge pipe (322) and connected to the separation inlet pipe (324), and a cylindrical rotating body (340) connected to the separation discharge pipe (322) while being rotatably mounted inside the solid-liquid separation body (350).

[0073] Water and microalgae discharged through the plate discharge pipe (122) may flow to the separation discharge pipe (322) by the operation of a pump or by gravity, and then may be separated from the water and microalgae while passing through a cylindrical rotating body (340). The separated water may be stored in a storage portion (354) located at the bottom of the solid-liquid separation body (350) and may be pumped by the operation of a pump to flow to the separation inlet pipe (324). The water flowing to the separation inlet pipe (324) may flow back into the inner space of the photosynthetic reactor (100) through the plate inlet pipe (124).

[0074] Water containing microalgae flowing into the separation discharge pipe (322) flows into a cylindrical rotating body (340) mounted inside a hollow solid-liquid separation body (350), so that water and microalgae can be separated.

[0075] The cylindrical rotor (340) can be rotatably mounted on the inside of the high-liquid separation body (350).

[0076] A plurality of water discharge holes (342) through which water is discharged may be formed on the side of the cylindrical rotor (340), and screw threads (344) protruding inward to a certain degree may be formed on the inner surface of the cylindrical rotor (340). Accordingly, as water mixed with microalgae passes through the cylindrical rotor (340), the centrifugal force generated by the rotation causes the water to be discharged through the water discharge holes (342), and the discharged water may be stored in the storage portion (354) located at the bottom of the solid-liquid separation body (350). As described above, the water stored in the storage portion (354) is pumped again by the operation of the pump and flows into the separation inlet pipe (324) and then into the inner space of the photosynthetic reactor (100).

[0077] The microalgae are moved along the screw thread (344) as the cylindrical rotor (340) rotates, and can eventually be stored in a separate microalgae storage unit (360) after passing through the cylindrical rotor (340).

[0078] As water is circulated in the manner described above, the microalgae can be discharged to the outside while continuing to circulate the water until no microalgae remain in the inner space of the photosynthetic reactor (100). That is, the water separated while passing through the cylindrical rotor (340) is allowed to flow back into the inner space of the photosynthetic reactor (100), and the introduced water can flow to one side and the other side of the inner space of the photosynthetic reactor (100), so that the remaining microalgae can be swept away by the flowing water and discharged to the outside.

[0079] Furthermore, after the final cultured microalgae are discharged, the separated water can be pumped back into the inner space of the photosynthetic reactor (100) while the inlet valve (123) is opened and the discharge valve (121) is closed. After the inner space of the photosynthetic reactor (100) is filled with water, the inlet valve (123) can be closed. Thereafter, the water previously used can be reused for the microalgae cultivation that is to be performed again. This can minimize waste of resources.

[0080] Although the technical features required for harvesting the microalgae described above are not illustrated in FIGS. 1 to 3 and FIG. 6 to clarify the description of other technical features, it goes without saying that technical features required for harvesting the microalgae cultured in the inner space of the photosynthetic reactor (100) other than the technical features illustrated in FIGS. 1 to 3 and FIG. 6 can be applied.

[0081]

[0082] The microalgae cultivation device according to the present invention requires a power supply. This power can be supplied by a solar panel (400) electrically connected to the microalgae cultivation device according to the present invention.

[0083] The microalgae cultivation device according to the present invention can be installed not only in buildings but also in bus stops. That is, the photosynthetic reactor (100) can be attached to the wall of a bus stop.

[0084] When a photosynthetic reactor (100) is attached to the wall of a bus stop, it can be electrically connected to a solar panel (400) mounted on the upper surface of the bus stop. Specifically, it can be configured so that the power produced by the solar panel (400) passes through an electric distribution control unit (420) and is supplied to each photosynthetic reactor (100).

[0085] By absorbing carbon dioxide generated at a bus stop and simultaneously discharging oxygen generated through photosynthesis to the outside, and furthermore, by supplying electricity generated from solar panels (400) installed at the bus stop rather than separately supplied electricity, greenhouse gas emissions can be minimized, waste of resources can be minimized, and the bus stop environment can be created as a pleasant one.

[0086] The photosynthetic reactor (100) can be configured to rotate around an upper connecting member (101) connecting the center of the upper frame (110) of the frame (110) of the photosynthetic reactor (100) and the bus stop, and a lower connecting member (102) connecting the center of the lower frame (110) of the frame (110) and the bus stop.

[0087] Specifically, the photosynthetic reactor (100) may be configured to rotate along the path of the sun via a separately configured control unit (not shown). The front side plate (120) of the photosynthetic reactor (100) may be configured to face the sun for as long as possible to receive as much sunlight as possible. Accordingly, the growth of microalgae may proceed as rapidly as possible.

[0088] As described above, a plurality of gas flow holes (112) through which oxygen flows out and carbon dioxide flows in can be formed in the upper frame (110) among the frames (110). Furthermore, it goes without saying that the technical features required to detach microalgae attached to the inner surface of the photosynthetic reactor (100) described above and the technical features required to harvest microalgae cultured in the inner space of the photosynthetic reactor (100) by discharging them to the outside can also be applied to a microalgae cultivation device installed in a bus stop.

[0089]

[0090] While the present invention has been described with reference to the embodiments illustrated in the drawings to facilitate understanding and reproduction by those skilled in the art, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible based on the embodiments of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims

1. A photosynthetic reactor (100) coupled to the outer wall of a structure; a microalgae cultivation device for mounting on the wall of a structure, comprising water and microalgae located in the inner space of the photosynthetic reactor (100); A microalgae cultivation device for mounting on a wall of a structure further comprising an inner magnet (150) positioned in the inner space of the above photosynthetic reactor (100).

2. In paragraph 1, The above photosynthetic reactor (100) includes a frame (110) that is coupled to the outer wall of the structure, and a front side plate (120) and a back side plate (140) made of a transparent material that are coupled to the frame (110). A microalgae cultivation device for mounting on a wall of a structure in which the inner magnet (150) is positioned so as to be movable in the inner space of a photosynthetic reactor (100) formed by the front side plate (120) and the back side plate (140).

3. In paragraph 2, A microalgae cultivation device for mounting on a wall of a structure in which the inner magnet (150) is positioned so as to be movable in the inner space of the photosynthetic reactor (100) while one side of the inner magnet (150) is in contact with the inner side of the front side plate (120) and the other side of the inner magnet (150) is in contact with the inner side of the back side plate (140).

4. In paragraph 2, A pad (152) is mounted on one side and the other side of the inner magnet (150). A microalgae cultivation device for mounting on a wall of a structure in which the pad (152) mounted on one side of the inner magnet (150) is in contact with the inner side of the front side plate (120), and the pad (152) mounted on the other side of the inner magnet (150) is in contact with the inner side of the back side plate (140), the inner magnet (150) is positioned to be movable in the inner space of the photosynthetic reactor (100).

5. In paragraph 3 or 4, It further includes a robot (200) that moves while attached to the outer surface of the front side plate (120) or the outer surface of the back side plate (140). By the magnetic force between the outer magnet (220) and the inner magnet (150) mounted on the robot (200), the inner magnet (150) moves in the inner space of the photosynthetic reactor (100) as the robot (200) moves. A brush (154) is mounted on the edge of one side and the edge of the other side of the inner magnet (150). A microalgae cultivation device for mounting on a wall of a structure, wherein a plurality of gas flow holes (112) through which oxygen flows out and carbon dioxide flows in are formed in the upper frame (110) of the above frames (110).

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