Dunaliella salina harvesting system

Abstract

The utility model relates to the technical field of algae harvesting, in particular to a dunaliella salina harvesting system which comprises a concentration unit, the concentration unit comprises a first concentration unit and a second concentration unit, and the first concentration unit and the second concentration unit are connected in sequence. Wherein the first concentration unit comprises a membrane pool and an algae liquid buffer tank, the second concentration unit comprises a centrifugal machine, and the membrane pool, the algae liquid buffer tank and the centrifugal machine are sequentially connected; and the recycling unit is respectively communicated with the membrane tank and the centrifugal machine through pipelines. The first concentration unit and the second concentration unit are arranged to concentrate the dunaliella salina-containing concentrated solution, so that the two concentration modes are combined to form complementation, the yield of the dunaliella salina can be improved, and the harvested dunaliella salina can have relatively high cell integrity; and by arranging the cyclic utilization unit, the culture water is recycled, so that the whole harvesting process is more energy-saving and environment-friendly while the culture water consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of algae harvesting, in particular to a salt algae harvesting system. Background Art

[0002] Dunaliella Salina is a green unicellular algae, which belongs to Chlorophyta, Chlorophyceae, Volvoxales, and Salinaraceae. It is tiny, generally about 14um×22um; it is the only soft-bodied microalgae in Chlorophyta that lacks a cell wall. It has unique economic value in food, medicine, chemical industry and aquaculture. At present, Dunaliella is mainly used to produce natural β-carotene. In many countries, the cultivation of Dunaliella cells has been achieved on a large scale, forming a large-scale microalgae industry. Compared with the maturity of aquaculture technology, the harvesting of Dunaliella is relatively difficult.

[0003] Harvesting salt algae is one of the key steps in the entire salt algae production process, which is directly related to the quality and production cost of salt algae. At present, salt algae are generally harvested using a single centrifugal separation system, which is easy to destroy the integrity of salt algae, thereby affecting the yield and subsequent use of salt algae. In addition, the existing harvesting system also has shortcomings such as the inability to recycle the aquaculture water and the large amount of aquaculture water consumed per unit of salt algae.

[0004] Therefore, how to provide a salt algae harvesting system to solve the above-mentioned deficiencies in the salt algae harvesting process is a technical problem that urgently needs to be solved. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model provides a salt algae harvesting system.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A salt algae harvesting system comprises a concentration unit, wherein the concentration unit comprises a first concentration unit and a second concentration unit, wherein the first concentration unit and the second concentration unit are connected in sequence;

[0008] Wherein, the first concentration unit comprises a membrane pool and an algae liquid buffer tank, the second concentration unit comprises a centrifuge, and the membrane pool, the algae liquid buffer tank and the centrifuge are connected in sequence;

[0009] It also includes a recycling unit, which is connected to the membrane pool and the centrifuge through pipelines.

[0010] Furthermore, it also includes a cleaning unit and a drying unit, and the concentration unit, the cleaning unit and the drying unit are connected in sequence through pipelines.

[0011] Furthermore, the cleaning unit includes an algae washing tank, a first screw pump and a batching tank which are sequentially connected through pipelines.

[0012] Furthermore, the drying unit includes a second screw pump and a spray drying tower, and the second screw pump is arranged between the batching tank and the spray drying tower.

[0013] Furthermore, it also includes a cyclone drying tower, which is connected to the bottom of the spray drying tower.

[0014] Furthermore, the centrifuge is a butterfly centrifuge, and three butterfly centrifuges are provided, and the three butterfly centrifuges form a three-phase butterfly centrifuge skid.

[0015] Furthermore, the recycling unit includes a mother liquid pool and a first liquid pump, and the first liquid pump is connected to the mother liquid pool.

[0016] Furthermore, it also includes a dust collector, which is connected to the top of the cyclone drying tower.

[0017] Furthermore, the dust collector is a bag dust collector.

[0018] Furthermore, it also includes a second liquid pump, which is arranged between the centrifuge and the algae washing tank.

[0019] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0020] The utility model provides a salt algae harvesting system, which concentrates the aquaculture water containing salt algae by setting a first concentration unit and a second concentration unit. The first concentration unit concentrates the salt algae aquaculture liquid by ultrafiltration membrane filtration, and the second concentration unit concentrates the salt algae concentrate by low-speed centrifugation. The two concentration methods are combined to form a complementary relationship, which is conducive to improving the yield of salt algae and can make the harvested salt algae have a higher cell integrity; by setting a recycling unit, the aquaculture water attached to the salt algae during the harvesting process can be recycled, and almost no waste liquid is discharged during the harvesting process, which reduces the consumption of aquaculture water and makes the entire harvesting process more energy-saving and environmentally friendly.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 The utility model is a structural schematic diagram of a salt algae harvesting system.

[0024] Reference numerals:

[0025] 11. First concentration unit; 111. Membrane pool; 112. Algae liquid buffer tank; 12. Second concentration unit;

[0026] 2. Recycling unit; 21. Mother liquor tank; 22. First liquid pump;

[0027] 3. Cleaning unit; 31. Algae washing tank; 32. First screw pump; 33. Mixing tank;

[0028] 4. Drying unit; 41. Second screw pump; 42. Spray drying tower; 43. Cyclone drying tower;

[0029] 5. Dust collector. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The following embodiments are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0031] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0032] like Figure 1As shown, the utility model provides a salt algae harvesting system, including a concentration unit (not shown in the figure), the concentration unit includes a first concentration unit 11 and a second concentration unit 12, the first concentration unit 11 and the second concentration unit 12 are connected in sequence;

[0033] Among them, the first concentration unit 11 includes a membrane pool 111 and an algae liquid buffer tank 112, and the second concentration unit 12 includes a centrifuge (not shown in the figure), and the membrane pool 111, the algae liquid buffer tank 112 and the centrifuge are connected in sequence; an ultrafiltration membrane device is arranged in the membrane pool 111, and the culture liquid containing salt algae is filtered through the ultrafiltration device arranged in the membrane pool 111 to obtain a first concentrated liquid containing algae salt and a first supernatant liquid not containing salt algae, and the first concentrated liquid containing salt algae is transported to the centrifuge through a pipeline and the algae liquid buffer tank 112, and the second concentrated liquid containing salt algae and the second supernatant liquid not containing salt algae are obtained through the centrifugal action of the centrifuge.

[0034] Among them, the working principle of ultrafiltration equipment is the membrane separation technology that purifies and separates the solution. The ultrafiltration membrane system is a solution separation device that uses ultrafiltration membrane filaments as the filtration medium and the pressure difference on both sides of the membrane as the driving force. The ultrafiltration membrane only allows water molecules, inorganic salts and small molecular organic matter in the solution to pass through, while intercepting the suspended salt algae macromolecules in the solution, thereby achieving the purpose of purification or separation.

[0035] Among them, the ultrafiltration equipment and the centrifuge can adopt conventional designs in the prior art, which will not be described in detail here.

[0036] It also includes a recycling unit 2, which is connected to the membrane pool 111 and the centrifuge through pipelines. The first supernatant obtained by the ultrafiltration equipment in the membrane pool 111 and the second supernatant produced after centrifugation are recovered into the salt algae cultivation pond through the recycling unit 2.

[0037] According to a specific embodiment provided by the utility model, it also includes a cleaning unit 3 and a drying unit 4, and the concentration unit, the cleaning unit 3 and the drying unit 4 are sequentially connected through pipelines. The cleaning unit 3 cleans and purifies the concentrated liquid produced by the concentration unit, and the drying unit 4 dehydrates the cleaned and purified salt algae to obtain solid salt algae powder.

[0038] According to a specific embodiment provided by the utility model, the cleaning unit 3 includes an algae washing tank 31, a first screw pump 32 and a batching tank 33 which are sequentially connected through pipelines.

[0039] According to a specific embodiment provided by the utility model, the drying unit 4 includes a second screw pump 41 and a spray drying tower 42, and the second screw pump 41 is arranged between the batching tank 33 and the spray drying tower 42. The working principle of the spray drying tower 42 is to put the concentrated liquid containing salt algae into the atomizer to separate it into droplets, and obtain the drying process of the powder and particle shaped product by direct contact between hot air and droplets. Using the spray drying tower 42 for drying has the following advantages: 1. The drying speed is fast, and it only takes a few seconds to complete; 2. Since the drying process is completed in an instant, the particles of the finished product can basically maintain the spherical shape of the droplets, and the product has good dispersibility, fluidity and solubility; 3. The production process is simplified and the operation and control are convenient; 4. Spray drying is usually used for solutions with a solid content of less than 60%. After drying, it is no longer necessary to crush and screen, which reduces the production process and simplifies the production process; 5. For the particle size, bulk density and moisture of the product, the operating conditions can be changed within a certain range, and adjustment, control and management are very convenient.

[0040] According to a specific embodiment provided by the utility model, a cyclone drying tower 43 is also included, and the cyclone drying tower 43 is connected to the bottom of the spray drying tower 42. The cyclone drying tower 43 is a highly efficient dry filtering dust removal equipment, and its main working principle is to separate dust particles from the airflow through centrifugal force, and then make them fall along the tower wall through gravity, and finally collect them in the ash hopper. At the same time, the clean gas will rotate upward through the exhaust pipe and finally be discharged. Taking the existing cyclone drying tower 43 structure as an example, it usually mainly includes an air inlet pipe, an exhaust pipe, a cylinder, a cone and an ash hopper.

[0041] According to a specific embodiment provided by the utility model, the centrifuge is a butterfly centrifuge, and three butterfly centrifuges are provided, and the three butterfly centrifuges form a three-phase butterfly centrifuge skid. Among them, the disc centrifuge can quickly and continuously separate solid-liquid and liquid-liquid, and is a kind of vertical centrifuge. The drum is installed on the upper end of the vertical shaft and is driven by an electric motor through a transmission device to rotate at high speed. The skid is to fix the centrifuge in a frame, and install the pipeline, centrifuge and other integral combinations therein. According to the process flow, spatial direction, and spatial layout of the structural unit, the centrifuge, process pipelines, etc. in the skid are reasonably planned and arranged according to relevant standards to make it a functional skid. The three-phase butterfly centrifuge skid belongs to the conventional setting in the prior art and will not be repeated here.

[0042] According to a specific embodiment provided by the utility model, the recycling unit 2 includes a mother liquid pool 21 and a first liquid pump 22 , and the first liquid pump 22 is connected to the mother liquid pool 21 .

[0043] According to a specific embodiment provided by the utility model, a dust collector 5 is also included, and the dust collector 5 is connected to the top of the cyclone drying tower 43.

[0044] According to a specific embodiment provided by the utility model, the dust collector 5 is a bag dust collector. A small amount of dried algae powder enters the bag dust collector along with the tail gas, and is then intercepted and retained by the bag.

[0045] According to a specific embodiment provided by the utility model, it also includes a second liquid pump (not shown in the figure), and the second liquid pump is arranged between the centrifuge and the algae washing tank.

[0046] The utility model is further described below in conjunction with a specific process of harvesting salt algae.

[0047] The culture liquid containing mature salt algae in the salt algae culture pond is concentrated by the first concentration unit 11 to obtain a first concentrated liquid and a first supernatant. The concentration process is as follows: the culture liquid containing mature salt algae flows into the membrane pool 111, and the membrane pool 111 is provided with an ultrafiltration device. After the culture liquid is filtered and concentrated by the ultrafiltration device, a first concentrated liquid containing salt algae and a first supernatant without salt algae are obtained. The volume of the first concentrated liquid is reduced to 1 / 4 of the volume of the culture liquid containing mature salt algae flowing into the membrane pool 111. The ultrafiltration device is connected to the algae liquid buffer tank 112. The first concentrated liquid is transported to the algae liquid buffer tank 112 through a third pump (not shown in the figure), and the first concentrated liquid flows from the algae liquid buffer tank 112 into the second concentration unit 12.

[0048] After the first concentrated liquid is concentrated by the second concentration unit 12, a second concentrated liquid containing salt algae and a second supernatant without salt algae are obtained. The second concentration unit 12 is a three-phase butterfly centrifuge skid formed by three butterfly centrifuges. Among them, during the centrifugation process, two of the three-phase butterfly centrifuge skids are opened and one is reserved, so as to prevent the centrifuge from being suddenly damaged during the centrifugation process, and the spare centrifuge is activated to avoid affecting production. At the same time, in order to avoid the damage to the integrity of salt algae cells caused by high-speed centrifugation, the centrifuge is operated at a low speed and low pressure state. Under this state, the integrity of the salt algae cells after centrifugation is ≥55%. After the first concentrated liquid is centrifuged, the second concentrated liquid and the second supernatant are obtained, and the upper supernatant is discharged. The volume of the second concentrated liquid is reduced to 1 / 10 of the volume of the original mature salt algae culture liquid.

[0049] The second concentrated liquid after centrifugation enters the slag box of the centrifuge, and is transported from the slag box of the centrifuge to the cleaning unit 3 through the second liquid pump for cleaning and purification. The cleaning unit 3 includes an algae washing tank 31, a first screw pump 32 and a batching tank 33 which are sequentially connected by pipelines. The cleaning process is as follows: after the second concentrated liquid is transported to the algae washing tank 31, pure water equivalent to 10 times the volume of the second concentrated liquid is added to the algae washing tank 31, and the pH of the solution is adjusted to below 3 by adding phosphoric acid to the algae washing tank 31. The solution in the algae washing tank 31 is fully stirred for 24 hours. After stirring, the solution is allowed to settle and stand for 24 hours, and the upper clear liquid is removed. Pure water equivalent to 10 times the volume of the second concentrated liquid is added to the precipitate again for a second sedimentation. The liquid in the algae washing tank 31 is fully stirred for 15 minutes, and the sedimentation is allowed to stand for 12 hours to obtain a sedimentation liquid. The sedimentation liquid is transported to the batching tank 33 through the first screw pump 32, and pure water equivalent to 10 times the volume of the sedimentation liquid is added to the batching tank 33. After the liquid in the batching tank 33 is stirred evenly, the solid powder of salt algae is obtained by the drying and dehydration action of the drying unit 4.

[0050] The drying process is as follows: the sedimentation liquid in the batching tank 33 is transported to the spray drying tower 42 through the second screw pump 41 for drying; the sedimentation liquid transported to the spray drying tower 42 is sprayed from the fine algae liquid by the atomizer at the top of the spray drying tower 42, and the sprayed algae liquid droplets are fully surrounded by high-temperature air, and are instantly heated and dehydrated to become solid powder. The solid powder falls to the bottom of the spray drying tower 42 under the action of gravity. The bottom of the spray drying tower 42 is connected to the cyclone drying tower 43. The solid powder that falls to the bottom of the drying tower flows downstream into the cyclone drying tower 43 to be collected to obtain solid salt algae powder.

[0051] The first supernatant produced by concentration in the membrane pool 111 and the second supernatant produced by centrifugation in the centrifuge both flow into the mother liquid pool 21, and the supernatant is transported to the culture pool for recycling through the first liquid pump 22.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A system for harvesting salt algae, characterized in that: include: A concentrating unit, wherein the concentrating unit comprises a first concentrating unit and a second concentrating unit, wherein the first concentrating unit and the second concentrating unit are connected in sequence; Wherein, the first concentration unit comprises a membrane pool and an algae liquid buffer tank, the second concentration unit comprises a centrifuge, and the membrane pool, the algae liquid buffer tank and the centrifuge are connected in sequence; It also includes a recycling unit, which is connected to the membrane pool and the centrifuge through pipelines.

2. The system for harvesting salt algae according to claim 1, characterized in that: It also includes a cleaning unit and a drying unit, and the concentration unit, the cleaning unit and the drying unit are connected in sequence through pipelines.

3. A salt algae harvesting system as claimed in claim 2, characterized in that: The cleaning unit comprises an algae washing tank, a first screw pump and a batching tank which are sequentially connected through pipelines.

4. A salt algae harvesting system as claimed in claim 3, characterized in that: The drying unit comprises a second screw pump and a spray drying tower, wherein the second screw pump is arranged between the batching tank and the spray drying tower.

5. A salt algae harvesting system as claimed in claim 4, characterized in that: It also includes a cyclone drying tower, which is communicated with the bottom of the spray drying tower.

6. The system for harvesting salt algae according to claim 1, characterized in that: The centrifuge is a butterfly centrifuge, and three butterfly centrifuges are provided, and the three butterfly centrifuges form a three-phase butterfly centrifuge skid.

7. The system for harvesting salt algae according to claim 1, characterized in that: The recycling unit includes a mother liquid pool and a first liquid pump, and the first liquid pump is connected to the mother liquid pool.

8. The system for harvesting salt algae according to claim 5, characterized in that: A dust collector is also included, and the dust collector is communicated with the top of the cyclone drying tower.

9. A salt algae harvesting system as claimed in claim 8, characterized in that: The dust collector is a bag dust collector.

10. The salt algae harvesting system according to claim 3, characterized in that: It also includes a second liquid pump, which is arranged between the centrifuge and the algae washing tank.

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