CN217438159U

CN217438159U - Microalgae culture coupling system for microalgae biomembrane and membrane raceway pond

Info

Publication number: CN217438159U
Application number: CN202220684984.XU
Authority: CN
Inventors: 姚婷; 黄建科; 赵哲; 张爱华; 苏博成; 曹乐; 李席席; 张志浩
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2022-09-16
Anticipated expiration: 2032-03-24

Abstract

The utility model relates to a microalgae culture coupling system of a microalgae biomembrane and a membrane raceway pond, the main body of the system is an annular raceway pond, a circulating power device for driving algae liquid to circulate along a raceway and a membrane component for filtering the algae liquid are arranged in the raceway pond, and a suction pump for sucking and discharging filtered fluid out of the raceway pond is externally connected with the membrane component; a microalgae biofilm component which forms an included angle relative to the horizontal plane of the raceway pond and is arranged at intervals is arranged right above the raceway of the raceway pond, and comprises a frame and a biofilm carrier; the system also comprises a circulating liquid feeding device, wherein the circulating liquid feeding device comprises a liquid inlet pipe, a circulating pump and a liquid discharge pipe, a liquid inlet of the circulating pump is connected with the liquid inlet pipe and communicated to the algae liquid in the raceway pond, a liquid outlet of the circulating pump is connected with the liquid discharge pipe, the algae liquid is guided by a liquid outlet of the liquid discharge pipe to the surface of the biomembrane carrier of each microalgae biomembrane assembly, and the microalgae biomembrane assembly guides the algae liquid to flow back to the raceway pond. The structure is beneficial to improving the production efficiency of the algae cells and the yield of the microalgae.

Description

Microalgae culture coupling system for microalgae biomembrane and membrane raceway pond

Technical Field

The utility model relates to a little algae are cultivateed and the water purification field is a little algae of little algae biomembrane and membrane runway pond cultivates coupled system.

Background

Microalgae is a tiny organism, grows through photosynthesis, can synthesize various nutrient substances such as natural pigments, proteins, unsaturated fatty acids, vitamins and the like, and is widely applied to the fields of biological medicine, health-care food, cosmetics, feed, fertilizer, biological carbon sequestration, wastewater treatment, environmental protection and the like. The runway pool is the most common microalgae large-scale culture system at present, has the advantages of simple construction and operation, low equipment and operation cost and the like, and has very obvious defects, because the runway pool has a thicker algae liquid layer of 20-30 cm, the algae cells have the functions of absorbing and dispersing light, the light can not penetrate into the algae liquid, the growth rate of the microalgae is slow, and the problems of high density, high production efficiency and the like are difficult to achieve. Meanwhile, harvesting of microalgae, i.e. separating algae (about 2-20 μm) from the algae liquid is very difficult, and generally, separation and harvesting are performed by adopting a centrifuge or flocculation and other modes, so that the energy consumption is high or substances such as a flocculating agent and the like need to be added, and secondary pollution is easily caused. These problems have greatly limited the further development and application of microalgae raceway ponds. Therefore, the structure of the existing microalgae runway pool system needs to be improved.

Disclosure of Invention

In order to overcome the defects, the utility model aims to provide a little algae culture coupled system of little algae biomembrane and membrane runway pond to this field, make it solve the problem that the current runway pond of the same kind is little algae culture production rate slower, is difficult to reach high density, high production efficiency, and the separation of algae body is comparatively inconvenient, has the technical problems of high energy consumption, easy production of secondary pollution and the like. The purpose is realized by the following technical scheme.

A microalgae culture coupling system of a microalgae biomembrane and a membrane raceway pond is characterized in that the coupling system is mainly an annular raceway pond, a circulating power device for driving algae liquid to circulate along a runway and a membrane component for filtering the algae liquid are arranged in the raceway pond, and a suction pump for sucking and discharging filtered fluid out of the raceway pond is externally connected with the membrane component; the structure is characterized in that a microalgae biomembrane assembly which forms an included angle relative to the horizontal plane of the raceway pond and is arranged at intervals is arranged right above the raceway of the raceway pond, the microalgae biomembrane assembly comprises a frame and a biomembrane carrier, the biomembrane carrier is fixed on the frame, and the frame is fixed at the included angle relative to the raceway pond; the coupling system further comprises a circulating liquid feeding device, the circulating liquid feeding device comprises a liquid inlet pipe, a circulating pump and a liquid discharge pipe, a liquid inlet of the circulating pump is connected with the liquid inlet pipe, the liquid inlet pipe is communicated to the algae liquid in the runway pool, a liquid outlet of the circulating pump is connected with the liquid discharge pipe, the algae liquid is guided to the surface of the biomembrane carrier of each microalgae biomembrane assembly by a liquid outlet of the liquid discharge pipe, and the microalgae biomembrane assembly guides the algae liquid to flow back to the runway pool. The microalgae biofilm component is matched with the circulating pump, so that the illumination space above the raceway pond is fully utilized, the algae liquid is conveyed to the surface of the microalgae biofilm component through the circulating pump, algae cells are attached to the surface of a biofilm carrier due to adsorption, a microalgae biofilm can be formed on the surface of the biofilm carrier after a certain time, the algae cells in the microalgae biofilm component grow rapidly under the action of sufficient illumination and algae liquid nutrients, the yield of the algae cells in a unit floor area is remarkably improved, and the production efficiency of the algae cells and the yield of the microalgae are improved. In addition, the wet algae mud layer on the microalgae biomembrane is scraped from the surface of the carrier in a scraping mode and collected in the container, so that the algae mud and algae are simply, quickly, conveniently and cheaply harvested.

The frame of the microalgae biomembrane component is a net frame or a grid frame, and the microalgae biomembrane carrier is a biomembrane formed by adsorbing microalgae in a raceway pond. By this structure, attachment and growth of microalgae and other microorganisms are facilitated.

The biomembrane carrier is polyester fiber cloth, nylon cloth or cotton cloth. The structure is a specific implementation structure used as a biological membrane carrier.

The circulating power device in the runway pool is a combination of a web wheel and a motor, namely the motor is in transmission connection with the web wheel to rotate, and the web wheel pushes the algae liquid. The structure is one implementation structure of the circulating power device, and the structure is simple.

The circulating power device in the runway pool is an aeration device, the aeration device comprises an aeration pipe and an air source, a section of runway in the runway pool forms a sinking groove, the middle part of the sinking groove is provided with a flow guide clapboard for separating the runway pool and enabling the sinking groove to form a U-shaped flow channel, namely, the runway pools on two sides of the flow guide clapboard are communicated through the U-shaped flow channel of the sinking groove, the membrane component is arranged in the flow channel on one side of the U-shaped flow channel for guiding the flow upwards, the aeration pipe is arranged below the membrane component in the flow channel on the side, and the aeration pipe is externally connected with the air source. Through the structure, the aeration effect of the aeration pipe is utilized, gas-liquid two-phase flow is formed in the flow channel on one side of the U-shaped flow channel, the density is lower than that of the surrounding water body, buoyancy is formed to drive the algae liquid to rise, the algae liquid in the flow channel on the other side is downwards supplemented to the rising side flow channel along the gap at the bottom of the diversion partition plate, and therefore the flow and circulation of the algae liquid in the flow channel pool are promoted, namely, the airlift membrane runway is formed, stirring devices such as web wheels in the traditional runway pool are replaced, the equipment cost and the energy consumption are lower, no pollution and damage are caused to the algae liquid, and the uniform distribution of algae cell suspension and nutrient substances is facilitated. Meanwhile, the membrane module is used for filtering and purifying algae liquid, and the filtered and purified water body is discharged along with the suction pump, so that secondary pollution to the outside is avoided.

And a liquid inlet pipe of the circulating liquid conveying device is connected to the rear part of the settling tank, namely the rear part of the algae liquid after passing through the settling tank.

The membrane module at least blocks microalgae cells from being in the runway pool. Through the structure, algae-laden water separation is effectively realized, and microalgae are gathered in the runway pool and are convenient to harvest.

The membrane component is a microfiltration membrane or an ultrafiltration membrane, and the pore diameter of the membrane is 0.01-1 mu m. Through this structure, effectively realize the high-efficient separation of solid and water in the suspension algae liquid, under the suction pump effect, when the algae liquid was through micro-filtration membrane or milipore filter, the runway pond is again held back to algae cell (generally 3 ~ 20 mu m), microorganism and other cell debris or impurity to can obtain the high clear water after purifying.

The aeration direction of the aeration pipe is consistent with the fluid diversion direction of the flow channel where the aeration pipe is located, and the aeration airflow of the aeration pipe faces the surface of the membrane module. Through this structure, the air supporting effect that the aeration formed is better, and the high-speed gas that the aeration formed constantly washes the membrane surface, avoids the accumulation of algae cell granule and the jam to membrane module membrane hole, guarantees membrane module functional effect and life.

And the gas source externally connected with the aerator pipe is mixed gas of compressed air and carbon dioxide or industrial carbon dioxide flue gas.

The utility model has the advantages that: 1. the membrane module is arranged in the runway pool, so that algae-laden water separation is realized efficiently at low cost and in a pollution-free manner, and algae liquid in the runway pool can be further concentrated and then collected; 2. the microalgae biofilm system is arranged above the raceway pond, so that the illumination of the space above the raceway pond is fully utilized, and the yield of algae cells in unit floor area is increased and the production efficiency is increased through the high-speed growth of the microalgae biofilm; 3. the system is applied to treatment of livestock or aquaculture wastewater and tail water, can obviously improve the purification efficiency of the wastewater and the removal rate of pollutants (such as nitrogen, phosphorus and COD) in the wastewater, and simultaneously obtains a purified water body which is pollution-free, clean and clear after being treated based on microalgae. It is suitable for being used as a photo-biological reaction tank for microalgae culture and water body purification, or the structural improvement of the similar reaction tank.

Drawings

Fig. 1 is a schematic structural diagram of a schematic side of the solution of the present invention.

Fig. 2 is a schematic top view of fig. 1.

Fig. 3 is a schematic diagram of the schematic structure of the scheme of the present invention.

Fig. 4 is a schematic top view of fig. 3.

The sequence numbers and names in the figure are: 1. a runway pool, 101, a sink, 2, web wheels, 3, a membrane component, 4, a suction pump, 5, a microalgae biological membrane component, 6, a circulating pump, 7, a liquid inlet pipe, 8, a liquid discharge pipe, 9, a flow guide partition board, 10 and an aeration pipe.

Detailed Description

The invention will now be further described with reference to the accompanying drawings.

In the first embodiment, as shown in fig. 1 and 2, the main body of the microalgae culturing coupling system is an annular raceway pond 1, a circulation power device for driving the algae liquid to circulate along the raceway is arranged in the raceway pond, and a membrane component 3 for filtering the algae liquid is arranged in the raceway pond, the circulation power device is a combination of a web wheel 2 and a motor, namely the motor is in transmission connection with the web wheel for rotation, the web wheel pushes the algae liquid to flow, and a suction pump 4 for sucking and discharging filtered fluid out of the raceway pond is externally connected to the membrane component. The microalgae biofilm assembly 5 which forms an included angle relative to the horizontal plane of the raceway pond and is arranged at intervals is arranged right above the raceway of the raceway pond, the microalgae biofilm assembly comprises a frame 501 and a biofilm carrier 502, the frame is a net frame or a grid frame, the biofilm carrier is a biofilm formed by adsorbing microorganisms, the biofilm carrier is preferably coarse cloth, the cloth is fixed on the frame, the frame is fixed at the included angle relative to the raceway pond, and the angle is preferably 60-90 degrees. The system further comprises a circulating liquid feeding device, the circulating liquid feeding device comprises a liquid inlet pipe 7, a circulating pump 6 and a liquid discharge pipe 8, a liquid inlet of the circulating pump is connected with the liquid inlet pipe, the liquid inlet pipe is communicated to the algae liquid in the raceway pond, a liquid outlet of the circulating pump is connected with the liquid discharge pipe, the algae liquid is guided by a liquid outlet of the liquid discharge pipe to the surface of the biomembrane carrier of each microalgae biomembrane assembly, and the microalgae biomembrane assembly guides the algae liquid to flow back to the raceway pond.

In the second embodiment, as shown in fig. 3 and 4, based on the first embodiment, the circulation power device in the raceway pond is replaced by an aeration device, the aeration device includes an aeration pipe 10 and an air source, a section of the raceway pond forms a sinking groove 101, the middle part of the sinking groove is provided with a flow guide partition plate 9 for separating the raceway pond and enabling the sinking groove to form a U-shaped flow channel, namely, the raceway ponds on both sides of the flow guide partition plate are communicated through the U-shaped flow channel of the sinking groove, the membrane module is arranged in the flow channel on one side of the U-shaped flow channel for upward flow guide, the aeration pipe 10 is arranged below the membrane module in the flow channel on the side, the aeration pipe is externally connected with the air source, and the air source is a mixed gas of compressed air and carbon dioxide or industrial carbon dioxide flue gas. The aeration effect of the aeration pipe is utilized to form gas-liquid two-phase flow in the flow channel on one side of the U-shaped flow channel, the density of the flow channel is lower than that of the surrounding water body, buoyancy is formed to drive the algae liquid to rise, the algae liquid in the flow channel on the other side is downwards supplemented to the flow channel on the rising side along the bottom gap of the diversion partition plate, and therefore the flow and circulation of the algae liquid in the runner pool are achieved.

Further, the liquid inlet pipe 7 of the above-mentioned circulating liquid feeding device is connected to the rear of the settling tank 101, that is, the rear of the algae liquid after passing through the settling tank.

The membrane module 3 of the first and second embodiments is used to block microalgae cells in the raceway pond 1, and for example, the membrane module is a microfiltration membrane or an ultrafiltration membrane, and the pore diameter of the membrane is 0.01-1 μm. Under the action of a suction pump, when the algae liquid passes through a microfiltration membrane or an ultrafiltration membrane, algae cells (generally 3-20 μm), microorganisms and other cell fragments or impurities are trapped in the raceway pond, so that a high-clarity purified water body can be obtained.

The aeration direction of the aeration pipe 10 is consistent with the fluid diversion direction of the flow channel where the aeration pipe is located, and the aeration airflow of the aeration pipe faces the surface of the membrane component 3. The high-speed gas formed by aeration continuously washes the surface of the membrane, thereby avoiding the accumulation of algae cell particles and the blockage of membrane pores of the membrane component, ensuring the functional effect and the service life of the membrane component.

The working process of the system is as follows: the runway pool 1 is internally preset with cultured algae liquid, wastewater is continuously or intermittently led into the runway pool through a wastewater pipe, a circulating power device is started, and the algae liquid forms flow and circulation in the runway pool. While the algae liquid flows, the continuous or intermittent operation is carried out by a circulating pump 6 on one side, and the algae liquid flows into the raceway pondThe algae liquid is pumped to the microalgae biomembrane component 5 by a circulating pump, algae cells can be attached to the surface of the biomembrane carrier 502 due to the adsorption effect, and the algae cells in the microalgae biomembrane component can grow rapidly under the action of sufficient illumination and nutrients in the culture solution. On the other hand, the suction pump 4 works continuously or intermittently, the algae liquid in the runway pool is separated from the water body through the membrane component 3, the supernatant (water body) is discharged out of the runway pool along with the suction pump, the algae cells are trapped in the runway pool, and when the algae cells reach a certain concentration, the concentrated collection treatment can be carried out. By the mode, the dual functions of microalgae culture and water purification are realized, and the yield (kg/m) of algae cells in unit floor area is effectively improved ² Kg/square meter/day), improving the production efficiency and microalgae yield.

The above contents are intended to illustrate the technical means of the present invention, and do not limit the technical scope of the present invention. Obvious modifications or substitutions for the present invention by a person of ordinary skill in the art in combination with the prior art also fall within the protection scope of the present invention.

Claims

1. A microalgae culture coupling system of a microalgae biomembrane and a membrane raceway pond is characterized in that the coupling system is mainly an annular raceway pond (1), a circulating power device for driving algae liquid to circulate along a runway and a membrane component (3) for filtering the algae liquid are arranged in the raceway pond, and a suction pump (4) for sucking and discharging filtered fluid out of the raceway pond is externally connected with the membrane component; the device is characterized in that a microalgae biofilm component (5) which forms an included angle relative to the horizontal plane of the raceway pond and is arranged at intervals is arranged right above the raceway of the raceway pond (1), the microalgae biofilm component comprises a frame (501) and a biofilm carrier (502), the biofilm carrier is fixed on the frame, and the frame is fixed at the included angle relative to the raceway pond; the coupling system further comprises a circulating liquid feeding device, the circulating liquid feeding device comprises a liquid inlet pipe (7), a circulating pump (6) and a liquid discharge pipe (8), a liquid inlet of the circulating pump is connected with the liquid inlet pipe, the liquid inlet pipe is communicated to the algae liquid in the raceway pond, a liquid outlet of the circulating pump is connected with the liquid discharge pipe, the algae liquid is guided to the surface of the biofilm carrier of each microalgae biofilm assembly by the liquid outlet of the liquid discharge pipe, and the microalgae biofilm assembly guides the algae liquid to flow back to the raceway pond.

2. The microalgae coupling system of claim 1, wherein the frame (501) of the microalgae biofilm assembly (5) is a net frame or a grid frame, and the biofilm carrier (502) is used for adsorbing microalgae in the raceway pond to form a biofilm.

3. The microalgae coupling system of claim 2, wherein the biofilm carrier (502) is a polyester cloth, nylon cloth, or cotton cloth.

4. The microalgae coupling system for culturing microalgae in biofilm and membrane raceway pond according to claim 1, characterized in that the circulating power device in the raceway pond (1) is a combination of a webbed wheel (2) and a motor, i.e. the motor is in transmission connection with the webbed wheel to rotate, and the webbed wheel pushes the algae liquid.

5. The microalgae coupling system for culturing microalgae in a biofilm and membrane raceway pond of claim 1, wherein the circulating power device in the raceway pond (1) is an aeration device, the aeration device comprises an aeration pipe (10) and an air source, a section of raceway of the raceway pond forms a sunken groove (101), the middle part of the sunken groove is provided with a flow guide partition plate (9) for separating the raceway pond and enabling the sunken groove to form a U-shaped flow channel, namely the raceway ponds on two sides of the flow guide partition plate are communicated through the U-shaped flow channel of the sunken groove, the membrane module is arranged in the flow channel on one side of the U-shaped flow channel for guiding flow upwards, the aeration pipe (10) is arranged below the membrane module in the flow channel, and the aeration pipe is externally connected with the air source.

6. The microalgae coupling system for culturing microalgae in biofilm and membrane raceway pond of microalgae of claim 5, wherein the liquid inlet pipe (7) of the circulating liquid feeding device is connected to the rear of the settling tank (101), namely the rear of the algae liquid after passing through the settling tank.

7. The microalgae coupling system of claim 5, wherein the membrane module (3) blocks microalgae cells from the raceway pond (1).

8. The microalgae coupling system of claim 7, wherein the membrane module (3) is a microfiltration membrane or an ultrafiltration membrane, and the pore diameter of the membrane is 0.01-1 μm.

9. The microalgae coupling system of claim 5, wherein the aeration direction of the aeration pipe (10) is the same as the fluid diversion direction of the flow channel, and the aeration air flow of the aeration pipe faces the surface of the membrane module (3).

10. The microalgae coupling system for culturing microalgae in the biofilm and membrane raceway pond of microalgae according to claim 5, wherein the gas source externally connected with the aeration pipe (10) is a mixed gas of compressed air and carbon dioxide or industrial carbon dioxide flue gas.