Integrated device based on microalgae culture harvesting and water circulation

Abstract

The utility model discloses an integrated device based on microalgae culture harvesting and water circulation, which comprises a microalgae culture tank, a microalgae temporary storage tank and a microalgae harvesting tank, the microalgae culture tank is fixedly arranged below the microalgae temporary storage tank, the microalgae harvesting tank is fixedly arranged on one side of the microalgae culture tank, and the microalgae harvesting tank is fixedly arranged on the other side of the microalgae culture tank. An air inlet pipe and a liquid inlet pipe are respectively mounted at the top of the microalgae temporary storage tank, a culture conveying pipe is fixedly connected between the microalgae culture tank and the microalgae temporary storage tank, a valve C is mounted on the culture conveying pipe, a harvesting conveying pipe is fixedly connected between the microalgae temporary storage tank and the microalgae harvesting tank, and a valve A is mounted on the harvesting conveying pipe. According to the microalgae culture and harvesting integrated device, microalgae culture and harvesting are integrated, the structure is simplified, the construction cost is reduced, the operation difficulty is reduced, the possibility that microalgae are polluted is reduced, and commercial production of microalgae is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to an integrated device based on microalgae cultivation, harvesting and water circulation. Background Art

[0002] Microalgae is a photoautotrophic microorganism with abundant sources, fast growth and reproduction, low production cost, easy control and large-scale production. It is small in size, high in photosynthetic efficiency, can grow on non-arable land, and can be used as a source of nutrition in brackish water, seawater and even wastewater. It has great development potential in CO2 fixation and energy production. The photosynthetic biomass of microalgae is dozens or even hundreds of times that of terrestrial plants. The CO2 fixed each year accounts for about 40% of the global net photosynthetic output, and the oil production per unit weight of microalgae is nearly 200 times that of ordinary oil crops. Therefore, microalgae is considered to be one of the most promising sources of third-generation biofuels. However, the cultivation efficiency of microalgae is low and it is easily contaminated during the cultivation process. Traditional closed photobioreactors, such as flat plate, column and pipeline reactors, have the disadvantages of easy growth of bacteria on the reactor surface and small illumination surface area. At the same time, the small cells, low density and high colloidal stability of microalgae limit their harvesting. Common harvesting methods are costly, complex to operate, and have low yields, which cannot meet the requirements of commercialization. Traditionally, microalgae cultivation and microalgae harvesting are usually separated, which is difficult to meet social production in terms of economic cost and production efficiency. Currently, the existing integrated microalgae cultivation and harvesting devices are usually complex in structure and high in construction cost. Utility Model Content

[0003] The purpose of the utility model is to provide an integrated device based on microalgae cultivation, harvesting and water circulation, which integrates microalgae cultivation and harvesting into an integrated design, which not only simplifies the structure and reduces the construction cost, but also reduces the difficulty of operation and the possibility of microalgae being contaminated.

[0004] In order to achieve the above-mentioned effect, the specific technical scheme adopted by the utility model is: a device based on the integration of microalgae cultivation, harvesting and water circulation, including a microalgae cultivation tank, a microalgae temporary storage tank and a microalgae harvesting tank, wherein the microalgae cultivation tank is fixedly installed below the microalgae temporary storage tank, a microalgae harvesting tank is fixedly installed on one side of the microalgae cultivation tank, an air inlet pipe and a liquid inlet pipe are respectively installed on the top of the microalgae temporary storage tank, a cultivation delivery pipe is fixedly connected between the microalgae cultivation tank and the microalgae temporary storage tank, a valve C is installed on the cultivation delivery pipe, a harvesting delivery pipe is fixedly connected between the microalgae temporary storage tank and the microalgae harvesting tank, a valve A is installed on the harvesting delivery pipe, a culture solution recovery pipe is fixedly connected between the microalgae harvesting tank and the microalgae cultivation tank, a valve B is installed on the culture solution recovery pipe, and Archimedes screw pumps A and B are respectively installed between the microalgae cultivation tank and the microalgae temporary storage tank.

[0005] Furthermore, a motor is fixedly installed at the top center of the microalgae temporary storage tank, a gear plate is fixedly installed on the output shaft of the motor, and gear shaft A and gear shaft B are respectively provided at the input shaft ends of Archimedes screw pump A and Archimedes screw pump B, and the gear plate is meshed with gear shaft A and gear shaft B for transmission at the same time.

[0006] Furthermore, a temperature controller is installed in the microalgae culture tank.

[0007] Furthermore, slide rails are installed in parallel in the microalgae harvesting tank, and filter plates are slidably installed between the slide rails. The porosity of the filter plates should be above 80%, and the pore size should not exceed 0.2 cm.

[0008] Furthermore, a glass fiber filter membrane is laid on the filter plate, and the pore size of the glass fiber filter membrane is less than 2 μm.

[0009] Furthermore, a base is fixedly installed at the bottom of the microalgae harvesting tank.

[0010] Furthermore, LED light strips are installed in the microalgae culture tank and the microalgae temporary storage tank.

[0011] Due to the adoption of the above technical solution, the beneficial effects of the utility model are as follows:

[0012] 1. The utility model realizes the integration of microalgae cultivation and harvesting, which not only simplifies the structure and reduces the construction cost, but also reduces the difficulty of operation and the possibility of microalgae contamination, thus meeting the commercial production of microalgae.

[0013] 2. The utility model only relies on a single motor to achieve the integration of microalgae cultivation and harvesting, saving a large amount of electric energy, which is of great significance to the cause of energy conservation and carbon fixation and emission reduction.

[0014] 3. The utility model has a good aeration function and does not need to install other aeration equipment.

[0015] 4. The utility model recycles the microalgae culture solution, which reduces the culture cost and also reduces the risk of fungus breeding during the microalgae culture process.

[0016] 5. The utility model uses an Archimedean screw pump, which is a new type of liquid transporting machinery, with the advantages of simple structure, safe and reliable operation, simple use and maintenance, and continuous and stable liquid discharge;

[0017] 6. The present invention has many advantages such as simple operation and low operating cost, and is an integrated device for microalgae cultivation, harvesting and water circulation with sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of the connection structure of the utility model;

[0019] As shown in the figure: 1-microalgae culture tank, 2-culture solution recovery pipe, 3-microalgae temporary storage tank, 4-motor, 5-harvesting and transporting pipe, 6-culture and transporting pipe, 7-filter plate, 8-slide rail, 9-Archimedes screw pump A, 10-Archimedes screw pump B, 11-valve A, 12-valve B, 13-valve C, 14-gear shaft A, 16-gear shaft B, 15-gear plate, 17-base, 18-temperature controller, 19-air inlet pipe, 20-liquid inlet pipe, 21-microalgae harvesting tank. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model is further described in detail below with reference to the accompanying drawings and embodiments.

[0021] See also Figure 1 The utility model is a device based on the integration of microalgae cultivation, harvesting and water circulation, comprising a microalgae cultivation tank 1, a microalgae temporary storage tank 3 and a microalgae harvesting tank 21, wherein the microalgae cultivation tank 1 is fixedly installed below the microalgae temporary storage tank 3, a microalgae harvesting tank 21 is fixedly installed on one side of the microalgae cultivation tank 1, an air inlet pipe 19 and a liquid inlet pipe 20 are respectively installed on the top of the microalgae temporary storage tank 3, a cultivation delivery pipe 6 is fixedly connected between the microalgae cultivation tank 1 and the microalgae temporary storage tank 3, and a microalgae harvesting tank 21 is fixedly installed on one side of the microalgae cultivation tank 1, and an air inlet pipe 19 and a liquid inlet pipe 20 are respectively installed on the top of the microalgae temporary storage tank 3, and a cultivation delivery pipe 6 is fixedly connected between the microalgae cultivation tank 1 and the microalgae temporary storage tank 3. A valve C13 is installed on the culture and delivery pipe 6, a harvesting and delivery pipe 5 is fixedly connected between the microalgae temporary storage tank 3 and the microalgae harvesting tank 21, a valve A11 is installed on the harvesting and delivery pipe 5, a culture liquid recovery pipe 2 is fixedly connected between the microalgae harvesting tank 21 and the microalgae culture tank 1, a valve B12 is installed on the culture liquid recovery pipe 2, and Archimedes screw pumps A9 and B10 are respectively installed between the microalgae culture tank 1 and the microalgae temporary storage tank 3.

[0022] A motor 4 is fixedly installed at the top center of the microalgae temporary storage tank 3, a gear plate 15 is fixedly installed on the output shaft of the motor 4, a gear shaft A14 and a gear shaft B16 are respectively arranged at the input shaft ends of the Archimedes screw pump A9 and the Archimedes screw pump B10, and the gear plate 15 is meshed with the gear shaft A14 and the gear shaft B16 for transmission. Therefore, the utility model drives the Archimedes screw pump A9 and the Archimedes screw pump B10 at the same time through one motor 4, simplifies the equipment structure, and reduces the equipment cost.

[0023] A temperature controller 18 is installed in the microalgae culture tank 1 to ensure that the temperature in the microalgae culture tank 1 is suitable for the growth of microalgae.

[0024] The microalgae harvesting tank 21 is provided with slide rails 8 installed in parallel, and a filter plate 7 is installed between the slide rails 8 for sliding, so that the filter plate 7 can be easily taken out from the microalgae harvesting tank 21, and the microalgae harvesting operation is convenient; the porosity of the filter plate 7 should be above 80%, and the pore size should not exceed 0.2 cm. A glass fiber filter membrane is laid on the filter plate 7, and the pore size of the glass fiber filter membrane is less than 2 μm. A base 17 is fixedly installed at the bottom of the microalgae harvesting tank 21 to ensure that the microalgae harvesting tank 21 is firmly fixed.

[0025] Example 1

[0026] This embodiment is used to demonstrate the working principle and usage of the utility model in the microalgae cultivation stage.

[0027] Close valve A11 and valve B12, and open valve C13; the sterilized culture solution enters the microalgae temporary storage tank 3 through the liquid inlet pipe 20, and then enters the microalgae culture tank 1 through the culture delivery pipe 6. A matching lid is installed at the mouth of the liquid inlet pipe 20, and the lid is closed after the culture solution is added. The temperature controller 18 monitors the temperature of the culture solution in the microalgae culture tank 1 in real time and controls the temperature of the culture solution at 25°C ± 0.2°C; the motor 4 is started to drive the Archimedes screw pump A9 and the Archimedes screw pump B10 to work, and the culture solution is brought from the microalgae culture tank 1 to the microalgae temporary storage tank 3, and part of the culture solution returns to the microalgae culture tank 1 through the culture delivery pipe 6. At this time, the output power of the motor is reduced to avoid a large amount of culture solution stagnating in the microalgae temporary storage tank 3; the cover of the liquid inlet pipe 20 is opened, and the concentrated microalgae culture solution is added to the microalgae temporary storage tank 3, and enters the microalgae culture tank 1 together with the previously added culture solution; at this time, the motor output power is reduced to allow the microalgae liquid to be pumped into the microalgae temporary storage tank 3 through the Archimedes screw pump A9 and the Archimedes screw pump B10. A breathable membrane is installed above the air inlet pipe 19, and the microalgae liquid returns to the microalgae culture tank 1 through the culture delivery pipe 6 at the same time, completing the aeration function. Due to the different places where the utility model is used, when it is used indoors, an LED light strip should be installed in the microalgae culture tank 1 or the microalgae temporary storage tank 3 to help the microalgae to photosynthesize.

[0028] Example 2

[0029] This embodiment is used to demonstrate the working principle and usage of the utility model in the microalgae harvesting stage.

[0030] Close valve C13, open valve A11 and valve B12; pump the microalgae liquid suitable for harvesting into the microalgae temporary storage tank 3 through Archimedes screw pump A9 and Archimedes screw pump B10, and enter the microalgae harvesting tank 21 through the harvesting and conveying pipe 5. A filter plate 7 is arranged in the microalgae harvesting tank 21, and a glass fiber filter membrane is placed on the filter plate 7 for harvesting microalgae. The pore size of the glass fiber filter membrane is less than 2 μm and needs to be replaced regularly; the filtered culture liquid is recovered to the microalgae culture tank 1 through the culture liquid recovery pipe 2. It is worth noting that since the speed of microalgae harvesting and filtering is not as fast as the speed of microalgae entering, when the microalgae liquid stagnates in the microalgae temporary storage tank 3 and reaches a certain amount, the motor 4 is turned off to wait for the microalgae to be harvested; when the microalgae are harvested, the filter plate 7 is pulled out from between the slide rails 8, the microalgae are scraped off, and the microalgae are harvested.

Claims

1. A device based on the integration of microalgae cultivation, harvesting and water circulation, comprising a microalgae cultivation tank (1), a microalgae temporary storage tank (3) and a microalgae harvesting tank (21), characterized in that: The microalgae culture tank (1) is fixedly installed below the microalgae temporary storage tank (3); a microalgae harvesting tank (21) is fixedly installed on one side of the microalgae culture tank (1); an air inlet pipe (19) and a liquid inlet pipe (20) are respectively installed on the top of the microalgae temporary storage tank (3); a culture delivery pipe (6) is fixedly connected between the microalgae culture tank (1) and the microalgae temporary storage tank (3); a valve C (13) is installed on the culture delivery pipe (6); and a valve C (13) is installed between the microalgae temporary storage tank (3) and the microalgae temporary storage tank (3). A harvesting and conveying pipe (5) is fixedly connected between the harvesting tanks (21), and a valve A (11) is installed on the harvesting and conveying pipe (5); a culture solution recovery pipe (2) is fixedly connected between the microalgae harvesting tank (21) and the microalgae culture tank (1), and a valve B (12) is installed on the culture solution recovery pipe (2); and an Archimedes screw pump A (9) and an Archimedes screw pump B (10) are respectively installed between the microalgae culture tank (1) and the microalgae temporary storage tank (3).

2. The device for integrating microalgae cultivation, harvesting and water circulation according to claim 1, characterized in that: A motor (4) is fixedly mounted at the top center of the microalgae temporary storage tank (3); a gear plate (15) is fixedly mounted on the output shaft of the motor (4); a gear shaft A (14) and a gear shaft B (16) are respectively arranged at the input shaft ends of the Archimedes screw pump A (9) and the Archimedes screw pump B (10); and the gear plate (15) is meshed with the gear shaft A (14) and the gear shaft B (16) for transmission.

3. The device for integrating microalgae cultivation, harvesting and water circulation according to claim 1, characterized in that: A temperature controller (18) is installed in the microalgae culture tank (1).

4. The device for integrating microalgae cultivation, harvesting and water circulation according to claim 1, characterized in that: Slide rails (8) are installed in parallel in the microalgae harvesting tank (21), and filter plates (7) are installed slidably between the slide rails (8). The porosity of the filter plates (7) should be above 80%, and the pore size should not exceed 0.2 cm.

5. The device for integrating microalgae cultivation, harvesting and water circulation according to claim 4, characterized in that: A glass fiber filter membrane is laid on the filter plate (7), and the pore size of the glass fiber filter membrane is less than 2 μm.

6. The device for integrating microalgae cultivation, harvesting and water circulation according to claim 4, characterized in that: A base (17) is fixedly mounted on the bottom of the microalgae harvesting tank (21).

7. The device for integrating microalgae cultivation, harvesting and water circulation according to claim 1, characterized in that: LED light strips are installed in the microalgae culture tank (1) and the microalgae temporary storage tank (3).

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