Microalgae culturing apparatus

Abstract

The present invention relates to a microalgae culturing apparatus comprising: a housing which has a predetermined installation space thereinside; a culture unit which is made of a transparent material and is provided in the form of a water tank having an algae culture space filled with microalgae and a culture medium therein so as to be capable of installation in or removal from the installation space in the housing; a culture unit connection part which is provided on one side of the installation space in the housing so as to, when the culture unit is placed and installed thereon, maintain a watertight state and have a connection structure in which the inside of the culture unit and the inside of the culture unit connection part communicate with each other; a lighting part which is installed on one side of the installation space in the housing and outputs and provides light toward the culture unit when the lighting unit is driven; an air supply unit which is connected to the lower portion of the culture unit connection part and provides an air supply path for supplying air introduced into the installation space from the outside of the housing to the algae culture space in the culture unit; and a culture medium circulation unit which is connected to the lower portion of the culture unit connection part so as to suck in the microalgae and the culture medium discharged to the lower portion of the algae culture space in the culture unit and circulate and discharge the microalgae and the culture medium to the upper portion of the algae culture space in the culture unit.

Description

Microalgae cultivation device

[0001] The present invention relates to a microalgae cultivation device.

[0002] As the use of fossil fuels rapidly increased due to industrialization, large amounts of greenhouse gases were produced. These greenhouse gases absorbed and blocked infrared rays that would otherwise be emitted into space, and then re-emitted them into the atmosphere, thereby causing the greenhouse effect, which increases the temperature of the atmosphere.

[0003] As a result, the global warming phenomenon is accelerating, and it is predicted that the average temperature will rise by 2 to 3 degrees Celsius in the coming 2030s. Among the greenhouse gases that are the main cause of global warming, the substance with the greatest impact is carbon dioxide.

[0004] The atmospheric concentration of carbon dioxide was 180 ppm during the last ice age, but it increased rapidly after the start of the Industrial Revolution, reaching 290 ppm in 1890 and about 360 ppm in 1992, showing a 30% increase over the past century. It is expected that by the end of the 21st century, the atmospheric concentration of carbon dioxide will reach 500 ppm, which is twice the level before industrialization, and even if the rate of increase in carbon dioxide emissions stabilizes at the 1970 level, it is expected to reach 1,000 ppm after 2000.

[0005] Ultimately, the issue of greenhouse gas reduction, which has recently been attracting attention as the biggest environmental issue in the international community, emphasizes the critical need for developing and disseminating carbon dioxide control technologies to actively reduce greenhouse gases and to implement plans and programs for such reduction.

[0006] Among the technologies for carbon dioxide fixation, biological methods using photosynthetic microorganisms have been proposed in various forms. Specifically, research on biological carbon dioxide fixation is actively being conducted to create added value by simultaneously processing carbon dioxide using microalgae and producing high-value useful substances from the produced biomass.

[0007] In this regard, the cultivation efficiency of microalgae can also be greatly improved, and further, a prior art document for providing a culture medium with excellent circulation of water containing microalgae is “Microalgae Cultivation Device” (hereinafter referred to as “prior art”) of Korean Patent Publication No. KR 10-2016-0136623.

[0008] However, in the case of existing microalgae cultivation devices, including prior art technologies, there was a problem that the process of recovering and obtaining cultured microalgae after the microalgae cultivation process and the process of preparing the microalgae for cultivation again had considerable complexity and difficulty, and thus the convenience of operation and management was at a very low level.

[0009] The present invention was created to solve the above problems, and the purpose of the present invention is to provide a microalgae cultivation device that not only performs the functions of culturing microalgae and purifying air at a very high and efficient level, but also has sufficient convenience in all processes of obtaining and managing the cultured microalgae through recovery, as well as preparing the microalgae culture again, and in managing the microalgae.

[0010] In order to achieve the above object, the microalgae cultivation device of the present invention comprises: a housing having a predetermined installation space therein; a culture unit formed of a transparent material and having an algae cultivation space filled with microalgae and a culture medium therein, the culture unit being installed or removed from the installation space within the housing in the form of a water tank; a culture unit connection part provided on one side of the installation space within the housing so that, when the culture unit is placed and installed on top, the culture unit maintains a watertight state and has a connection structure in which the insides are connected to each other; a lighting part installed on one side of the installation space within the housing and provides light output toward the culture unit when operated; an air supply unit connected to a lower portion of the culture unit connection part to provide an air supply path for supplying air introduced into the installation space from outside the housing to the algae cultivation space within the culture unit; and a culture medium circulation unit connected to a lower portion of the culture unit connection part to suck in microalgae and culture medium discharged to a lower portion of the algae cultivation space within the culture unit and circulate and discharge the microalgae and culture medium to an upper portion of the algae cultivation space within the culture unit.

[0011] Here, the culture unit includes a culture tank portion, which is a transparent material tank having an algae culture space inside, a filter installation port open to the upper side and a culture solution outlet provided at a lower central portion; and an algae filter portion, which is fitted into the filter installation port provided at the upper side of the culture tank portion and has a culture solution circulation outlet provided at the upper side through which microalgae and culture solution sucked in through the culture solution circulation unit are circulated and discharged, and a filter for filtering microalgae in the culture solution and microalgae circulated and discharged through the culture solution circulation outlet is installed at the bottom surface.

[0012] In addition, the algae filter unit includes an installation structure that is inserted into the filter installation opening that is open on the upper side of the culture tank unit and has a plurality of culture solution overflow prevention ports that are open so as to communicate with the algae culture space when inserted into the filter installation opening along the upper side; a hanging structure that is formed to protrude outwardly from the upper end of the installation structure to form a step so as to be hung and settled on the upper end of the culture tank unit when the installation structure is inserted into the filter installation opening, and has the culture solution circulation outlet provided on one upper side; and a filter structure that is provided in a form in which the filter is inserted and installed inside a frame having an upper and lower open space for exposing the filter, and is installed so as to form an inclined surface that is inclined so as to decrease in height from the side of the culture solution circulation outlet to the opposite side at the lower end of the installation structure.

[0013] Here, the filter installed in the filter structure is arranged to form a vertical cross-section in a curved zigzag shape with repeated peaks and valleys along both left and right sides of the culture solution circulation outlet.

[0014] In addition, the culture unit further includes a culture solution discharge control unit that is connected to the lower part of the culture tank so that one end of the culture solution transfer pipe is connected to the culture solution discharge port, and controls whether or not to discharge microalgae and culture solution through the culture solution discharge port depending on whether the culture solution transfer pipe is opened or closed; the culture unit connection unit has a predetermined culture solution receiving space that is open upward, and when the culture unit is placed and installed above, the lower end of the culture solution discharge control unit covers the open upper side of the culture solution receiving space to form a watertight state, and the other end of the culture solution transfer pipe is exposed toward the culture solution receiving space and is connected to each other.

[0015] In addition, the cross-sectional size of the lower structure of the culture tank portion decreases as it faces downward toward the culture solution outlet, forming a tapered cone shape.

[0016] In addition, the housing has a plurality of outside air inlets on the lower side surface that are open so that the outside and the installation space can be communicated with each other, and the air supply unit includes an air filter unit that is provided as a filter member for filtering out foreign substances contained in an air layer and is installed at the lower part of the installation space within the housing; a transfer fan unit that is installed at one side of the lower part of the installation space within the housing corresponding to a position between the plurality of outside air inlets and the air filter unit in the vertical height direction and transfers air that is introduced into the installation space from the outside through the plurality of outside air inlets toward the air filter unit; an air supply pipe unit that is connected to the culture unit connection unit so that one end is inserted and protrudes into the culture solution receiving space; and an air pump unit to which the other end of the air supply pipe unit is connected and that sucks air that has passed through the air filter unit through the transfer fan unit and pressurizes and discharges it toward one end of the air supply pipe unit.

[0017] In addition, the culture solution circulation unit includes a culture solution circulation pipe part which is connected to the lower end of the culture unit connection part so that one end is inserted and protruded into the culture solution receiving space, and the other end is inserted and protruded into a circulation outlet provided in the algae filter part; and a culture solution circulation pump part which is installed on one side of the culture solution circulation pipe part and sucks in microalgae and culture solution discharged to the culture solution receiving space from one end side of the culture solution circulation pipe part and pressurizes and circulates them to the other end side of the culture solution circulation pipe part; and one end of the culture solution circulation pipe part is formed at a position where the height at which it is inserted and protruded into the culture solution receiving space is lower than the height at which one end of the air supply pipe part is inserted and protruded into the culture solution receiving space.

[0018] According to the present invention, the following effects are achieved.

[0019] First, microalgae cultivation can provide air purification and lighting functions.

[0020] Second, microalgae cultivation can provide a carbon reduction function.

[0021] Third, the recovery and management of cultured microalgae can be performed more efficiently and easily.

[0022] Fourth, after culturing microalgae, the microalgae and culture solution are separated and filtered through circulation discharge to effectively separate only the microalgae. This prevents various situations in which the filter may be clogged by the filtered microalgae and the culture solution may leak to the outside.

[0023] Figure 1 is a perspective view illustrating the structure of a microalgae cultivation device according to the present invention.

[0024] Figure 2 is a perspective view showing the internal structure of the housing and the installation location for each component of the microalgae cultivation device according to the present invention.

[0025] Figure 3 is an exploded perspective view showing the detailed installation structure of a culture unit in a microalgae culture device according to the present invention.

[0026] Figure 4 is an exploded perspective view showing the detailed installation structure of the filter structure constituting the algae filter section of the culture unit in the microalgae culture device according to the present invention.

[0027] Figure 5 is a perspective view illustrating the configuration and piping structure related to air supply and culture medium circulation inside the housing of a microalgae cultivation device according to the present invention.

[0028] Figure 6 is a cross-sectional view showing the structure of the culture unit and the connection part of the culture unit connection part of the microalgae culture device according to the present invention.

[0029] A preferred embodiment of the present invention will be described in more detail with reference to the attached drawings, but already well-known technical parts will be omitted or compressed for the sake of brevity.

[0030] <Description of the microalgae cultivation device>

[0031] Referring to FIGS. 1 to 3, the microalgae cultivation device (100) of the present invention relates to a device that cultivates microalgae so that a manager can easily collect the cultivated microalgae and simultaneously provides an air purification function, and for this purpose, includes a housing (110), a cultivation unit (120), a cultivation unit connection part (130), a lighting part (140), an air supply unit (150), a culture solution circulation unit (160), and a control module (not shown).

[0032] The housing (110) has a configuration that has the overall appearance of the device (100) as shown in FIG. 1, and a predetermined installation space (110T) is provided inside, and the installation positions of various components to be described later, as shown in FIGS. 1 to 3, are fixed in the installation space (110T).

[0033] Here, a plurality of open air intake ports (110H) are provided on the lower side of the housing (110) so that the outside can be connected to the installation space (110T), and an open purified air exhaust port is also provided on the upper side of the housing (110) so that clean air purified during the process of culturing microalgae through the cultivation unit (120) can move upward and be discharged to the outside.

[0034] The cultivation unit (120) is provided with light necessary for cultivating microalgae from the outside through a lighting unit (140), and is made of a transparent material so that the cultivation unit (120) itself can also be used as a form of lighting in connection therewith. It is provided in the form of a tank with an algae cultivation space (120T) filled with microalgae and a culture solution inside.

[0035] This cultivation unit (120) is provided so that it can be installed or removed in the installation space (110T) within the housing (110), so that when the cultivation of microalgae is completed for a certain period of time from the installation space (110T), it is removed and recovered, and the worker can easily proceed with obtaining the cultured microalgae, managing or replacing the culture solution and microalgae for the next cultivation, thereby providing sufficient convenience for work.

[0036] To this end, as shown in FIGS. 2 and 5, a culture unit (120) is placed on the upper side of the central side of the installation space (110T) in the vertical height direction within the housing (110), and a culture unit connection part (130) is provided so that, when installed, it maintains a watertight state and has a connection structure in which the interiors are connected to each other.

[0037] Specifically, the culture unit (120) includes a culture tank section (121), an algae filter section (122), and a culture solution discharge control section (123) for cultivating microalgae, recovering cultured microalgae through circulation of the culture solution, and discharging air purified during the microalgae culture process.

[0038] First, the culture tank (121) is a transparent tank equipped with an algae culture space (120T) inside, which is equipped with a filter installation port (121T) open to the upper side as shown in FIG. 3 and a culture solution discharge port (121H) in the lower central portion.

[0039] Specifically, the lower structure of the culture tank (121) has a flat cross-sectional size that decreases as it goes downward toward the culture solution outlet (121H) and forms a tapered cone shape so that the process of circulation through discharge of the culture solution to the culture solution outlet (121H) can be performed more efficiently.

[0040] Next, the algae filter unit (122) is installed by fitting into the filter installation port (121T) provided on the upper side of the culture tank unit (121), and a culture solution circulation outlet (122H) is provided at the upper part through which the microalgae and culture solution sucked in through the culture solution circulation unit (160) are circulated and discharged.

[0041] Here, a filter (122cc) is installed on the bottom surface of the algae filter unit (122) to filter out microalgae and microalgae in the culture solution that are circulated and discharged through the culture solution circulation outlet (122H).

[0042] Specifically, the algae filter unit (122) includes an installation structure (122a), a hanging structure (122b), and a filter structure (122c) to enable the air purified during the filtering and microalgae cultivation process to be discharged upward for obtaining microalgae through the circulation of the culture solution.

[0043] First, the installation structure (122a) is inserted into a filter installation port (121T) open on the upper side of the culture tank section (121) as shown in FIG. 3, and a plurality of culture solution overflow prevention ports (122T) are provided along the upper side so as to be connected to the algae culture space (120T) when inserted into the filter installation port (121T).

[0044] Through this, in the process where only the microalgae and culture medium circulated and discharged toward the culture medium circulation outlet (122H) are filtered out by the filter (122cc), the filtered microalgae block the filter (122cc), and the amount of culture medium discharged to the algae culture space (120T) decreases, so that the culture medium gradually accumulates and the level of the culture medium waiting to be discharged rises. In this process, the culture medium circulated and discharged outside the device is prevented from overflowing by first being discharged back to the algae culture space (120T) without being filtered by the multiple culture medium overflow prevention ports (122T).

[0045] Next, the hanging structure (122b) is extended to form a step by protruding outward from the top of the installation structure (122a), so that the installation structure (122a) is hung and settled on the top of the culture tank (121) when inserted into the filter installation port (121T).

[0046] As shown in Fig. 3, a culture medium circulation outlet (122H) is provided on the upper side (rear side based on Fig. 3) of this hanging structure (122b).

[0047] Lastly, the filter structure (122c) is provided in a form in which a filter (122cc) is inserted and installed inside a frame (122ca, 122cb) having upper and lower open spaces for filter exposure.

[0048] This filter structure (122c) is installed to form a sloped surface that becomes lower in height as it goes from the culture solution circulation outlet (122H) side (rear side based on FIG. 3) to the opposite side (front side based on FIG. 3) at the bottom of the installation structure (122a).

[0049] Specifically, as shown in FIG. 4, the filter structure (122c) is divided into a '+' shaped structure in the center and has a filter (122cc) inserted between an upper frame (122ca) and a lower frame (122cb) having four open areas, so that among the circulated microalgae and culture solution, the microalgae are filtered out and the culture solution passes through to return to the algae culture space (120T) of the culture tank section (121) located below, and at the same time, the air purified in the algae culture space (120T) of the culture tank section (121) during the microalgae culture process is discharged upward through the filter (122cc).

[0050] Here, the filter (122cc) installed in the filter structure (122c) is arranged to form a vertical cross-section in a curved zigzag shape with peaks (C) and valleys (T) repeated along both left and right sides of the culture solution circulation outlet (122H), as shown in the enlarged cross-section of FIG. 4.

[0051] As a result, the filter (122cc) installed in the filter structure (122c) is installed in a slanted shape with its height decreasing from the side of the culture medium circulation outlet (122H) to the opposite side, and has a curved zigzag shape with repeated peaks (C) and valleys (T) on the left and right cross sections, so that the microalgae discharged in circulation and the microalgae in the culture medium are first gathered on the side opposite to the culture medium circulation outlet (122H) corresponding to the lower side of the slope during the filtering process, and are first gathered in the valley (T) area on the left and right cross sections.

[0052] Through this, during the process of filtering the microalgae and culture solution in the circulated discharged microalgae through the filter (122cc), the microalgae prevents the entire surface of the filter (122cc) from being easily and quickly covered by the microalgae, thereby minimizing the phenomenon of the culture solution not passing through due to the microalgae covering the entire surface of the filter (122cc).

[0053] Lastly, the culture solution discharge control unit (123) is connected to the lower part of the culture tank unit (121) so that one end of the culture solution transfer pipe (123P) is connected to the culture solution discharge port (121H), and controls whether microalgae and culture solution are discharged through the culture solution discharge port (121H) depending on whether the culture solution transfer pipe (123P) is opened or closed.

[0054] In connection with this, the culture unit connecting part (130) is provided with a predetermined culture solution receiving space (130T) that is open to the upper side, and when the culture unit (120) is placed and installed on the upper side of the culture unit connecting part (130), as shown in FIG. 6, the lower end of the culture solution discharge control part (123) covers the open upper side of the culture solution receiving space (130T) to form a watertight state, and the other end of the culture solution transfer pipe (123P) is exposed toward the culture solution receiving space (130T) to form a mutually connected structure.

[0055] The lighting unit (140) is installed on the rear side of the installation space (110T) within the housing (110) and outputs light toward the cultivation unit (110) when operating, thereby providing sufficient light necessary for cultivating microalgae and enabling the entire device (100) to be utilized as lighting.

[0056] The air supply unit (150) is connected to the lower part of the culture unit connection part (130) and provides an air supply path for supplying air introduced from the outside of the housing (110) into the installation space (110T) to the algae culture space (120T) within the culture unit (120).

[0057] For this purpose, the air supply unit (150) includes an air filter unit (151), a transfer fan unit (152), an air supply pipe unit (153), and an air pump unit (154).

[0058] Here, the air filter unit (151) is provided as a filter member that filters out foreign substances contained in the air layer, and is installed at the bottom of the installation space (110T) within the housing (110).

[0059] In addition, the transfer fan unit (152) is installed on one side of the lower portion of the installation space (110T) within the housing (110) between the plurality of external air intake ports (110H) and the air filter unit (151) in the vertical height direction, and transfers air that is introduced into the installation space (110T) from the outside through the plurality of external air intake ports (110H) to the air filter unit (151).

[0060] Next, the air supply pipe (153) is connected to the culture unit connection (130) so that one end is inserted and protruded into the culture solution receiving space (130T) as shown in FIGS. 5 and 6, and the other end is connected to the air pump unit (154), and a predetermined air supply valve (not shown) is installed to control the movement and amount of air that is sucked in through the air pump unit (154) on one end and then discharged from the other end to the one end.

[0061] Lastly, the air pump unit (154) sucks in air that has passed through the air filter unit (151) through the transfer fan unit (152) and causes the air sucked in to be pressurized and discharged from the other end of the air supply pipe unit (153).

[0062] The culture solution circulation unit (160) is connected to the lower part of the culture unit connection part (130), and sucks in microalgae and culture solution discharged to the lower part of the algae culture space (120T) in the culture unit (120) and circulates and discharges them to the upper part of the algae culture space (120T) in the culture unit (120), thereby enabling filtering and acquisition of microalgae.

[0063] For this purpose, the culture solution circulation unit (160) includes a culture solution circulation pipe section (161) and a culture solution circulation pump section (162).

[0064] First, as shown in FIGS. 5 and 6, the culture solution circulation pipe (161) is connected to the lower end of the culture unit connection part (130) so that one end is inserted and protruded into the culture solution receiving space (130T), and the other end is inserted and protruded into the circulation outlet (122H) provided in the algae filter part (122).

[0065] Specifically, the culture solution circulation pipe section (161) is divided into a first pipe section (161a) in which one end is inserted and protruded into the culture solution receiving space (130T) and the other end is connected to the culture solution circulation pump section (162), as shown in FIG. 5, and a second pipe section (161b) in which one end is connected to the culture solution circulation pump section (162) and the other end is inserted and protruded into the circulation outlet (122H) provided in the algae filter section (122).

[0066] In addition, the microalgae and culture solution circulated and discharged to the other end (161c) of the second pipe area (161b) of the culture solution circulation pipe section (161) are moved to the inside of the algae filter section (122) and undergo filtering of the microalgae.

[0067] Next, the culture solution circulation pump unit (162) is installed on one side of the culture solution circulation pipe unit (161), and sucks the microalgae and culture solution discharged to the culture solution receiving space (130T) from one side of the culture solution circulation pipe unit (161) and pressurizes and circulates them to the other side of the culture solution circulation pipe unit (161).

[0068] Specifically, as shown in FIG. 6, one end of the culture medium circulation pipe (161) is formed at a lower position than the height (H1) at which one end of the air supply pipe (153) is inserted and protruded into the culture medium receiving space (130T) to prevent the culture medium from flowing over one end of the air supply pipe (153) as much as possible during the circulation and discharge process of the culture medium, and at the same time, air discharged from one end of the air supply pipe (153) can be supplied more efficiently to the other end of the culture medium transfer pipe (123P).

[0069] A control module (not shown) is installed on one side of the installation space (110T) within the housing (110) and controls the operating status of the electrically connected lighting unit (140), transfer fan unit (152), air supply valve (not shown), air pump unit (154), and culture medium circulation pump unit (162).

[0070] The embodiments disclosed in the present invention are intended to illustrate, not limit, the technical concepts of the present invention. These embodiments do not limit the scope of the technical concepts of the present invention. The scope of protection should be interpreted according to the following claims, and all technical concepts within the scope equivalent thereto should be construed as being included within the scope of the present invention.

[0071] <Explanation of symbols>

[0072] 100: Microalgae cultivation device

[0073] 110: Housing

[0074] 110T: Installation space 110H: Outside air inlet

[0075] 120: Cultivation Unit

[0076] 120T: Algae cultivation space 121: Cultivation tank section

[0077] 121H: Culture medium outlet 121T: Filter installation port

[0078] 122: Algae filter section 122H: Culture solution circulation outlet

[0079] 122F: Filter 122T: Culture solution overflow prevention device

[0080] 123: Culture solution discharge control unit

[0081] 130: Cultivation unit connection part 140: Lighting part

[0082] 150: Air supply unit

[0083] 151: Air filter section 152: Transfer fan section

[0084] 153: Air supply pipe section 154: Air pump section

[0085] 160: Culture fluid circulation unit

[0086] 161: Culture solution circulation pipe section 162: Culture solution circulation pump section

Claims

1. A housing having a predetermined installation space inside; A culture unit made of transparent material and having an algae culture space filled with microalgae and culture solution inside, which is provided in the form of a tank and can be installed or removed from the installation space within the housing; A culture unit connection part provided on one side of the installation space within the housing so that when the culture unit is placed and installed on the upper side, it maintains a watertight state and has a connection structure in which the interiors are connected to each other; A lighting unit installed on one side of the installation space within the housing and providing light output toward the cultivation unit when operated; An air supply unit connected to the lower portion of the above-mentioned cultivation unit connection section, providing an air supply path for supplying air introduced from outside the housing into the installation space to the algae cultivation space within the above-mentioned cultivation unit; and It is characterized by including a culture solution circulation unit connected to the lower part of the above culture unit connection, which sucks in microalgae and culture solution discharged to the lower part of the algae culture space in the culture unit and circulates and discharges them to the upper part of the algae culture space in the culture unit. Microalgae cultivation device.

2. In paragraph 1, The above culture unit is, A culture tank section corresponding to a transparent material tank having an algae culture space inside, which is equipped with a filter installation port open to the upper side and a culture solution discharge port in the lower central part; and It is characterized by including an algae filter section which is fitted into the filter installation port provided on the upper side of the culture tank section, and has a culture solution circulation outlet provided at the top through which microalgae and culture solution sucked in through the culture solution circulation unit are circulated and discharged, and a bottom surface having a filter installed to filter out microalgae among the microalgae and culture solution circulated and discharged through the culture solution circulation outlet. Microalgae cultivation device.

3. In paragraph 2, The above algae filter part, An installation structure having a plurality of culture solution overflow prevention ports that are inserted into the filter installation port opened on the upper side of the culture tank section and are opened to communicate with the algae culture space when inserted into the filter installation port along the upper side; A hanging structure formed to extend outwardly from the top of the installation structure to form a step, such that when the installation structure is inserted into the filter installation port, it is hung and settled on the top of the culture tank, and the culture solution circulation outlet is provided on one side of the upper portion; and The filter is installed in a form in which the filter is inserted inside a frame having an upper and lower open space for filter exposure, and the filter structure is installed to form an inclined surface so that the height decreases from the side of the culture solution circulation outlet to the opposite side at the bottom of the installation structure; characterized in that it includes Microalgae cultivation device.

4. In paragraph 3, The filter installed in the above filter structure is characterized in that it is arranged to form a vertical cross-section in a curved zigzag shape with peaks and valleys repeated along both left and right sides of the culture solution circulation outlet. Microalgae cultivation device.

5. In paragraph 3, The above culture unit is, A culture solution transfer pipe is connected to the lower part of the culture tank so that one end thereof is connected to the culture solution discharge port, and a culture solution discharge control unit is further included to control whether microalgae and culture solution are discharged through the culture solution discharge port depending on whether the culture solution transfer pipe is opened or closed. The above culture unit connection part has a predetermined culture solution receiving space that is open to the upper side, and when the culture unit is placed and installed on the upper side, the lower part of the culture solution discharge control part covers the open upper side of the culture solution receiving space to form a watertight state, and the other end of the culture solution transfer pipe is exposed toward the culture solution receiving space and is connected to each other. Microalgae cultivation device.

6. In paragraph 3, The above culture tank section is characterized in that the lower structure has a flat cross-sectional size that decreases as it faces downward toward the culture solution outlet, forming a tapered cone shape. Microalgae cultivation device.

7. In paragraph 5, The above housing has a number of open outside air inlets on the lower side to allow communication between the outside and the installation space, The above air supply unit, An air filter unit installed at the bottom of the installation space within the housing, which is provided with a filter member that filters out foreign substances contained in the air layer; A transfer fan unit installed on one side of the lower portion of the installation space within the housing between the plurality of external air intake ports and the air filter unit in the vertical height direction, transferring air introduced into the installation space from the outside through the plurality of external air intake ports to the air filter unit; An air supply pipe connected to the culture unit connection so that it is inserted and protruded into the culture solution receiving space; and The other end of the air supply pipe is connected, and the air pump unit is characterized by including the air pump unit that sucks in air that has passed through the air filter unit through the transfer fan unit and pressurizes and discharges it to one end of the air supply pipe unit. Microalgae cultivation device.

8. In paragraph 5, The above culture medium circulation unit is, A culture solution circulation pipe part connected to the lower end of the culture unit connection part so that one end is inserted and protruded into the culture solution receiving space, and the other end is inserted and protruded into the circulation outlet provided in the algae filter part; and It includes a culture solution circulation pump unit installed on one side of the culture solution circulation pipe unit, which sucks in microalgae and culture solution discharged to the culture solution receiving space from one side of the culture solution circulation pipe unit and pressurizes and circulates them to the other side of the culture solution circulation pipe unit; One end of the culture solution circulation pipe is formed at a lower position than the height at which one end of the air supply pipe is inserted and protruded into the culture solution receiving space. Microalgae cultivation device.

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