CN111548930A - Harvesting system for assisting flocculation of microalgae algaecide through microwaves - Google Patents
Harvesting system for assisting flocculation of microalgae algaecide through microwaves Download PDFInfo
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- C12M33/00—Means for introduction, transport, positioning, extraction, harvesting, peeling or sampling of biological material in or from the apparatus
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- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
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Abstract
The invention discloses a harvesting system for assisting flocculation of microalgae algaecide by microwaves, which comprises a microalgae algaecide storage pool and a settling tank, wherein the microalgae algaecide storage pool is communicated with the settling tank through a multi-section main pipeline, a microwave irradiation device is connected to the main pipeline, a coil pipe is arranged in the inner cavity of the microwave irradiation device, two ends of the coil pipe are respectively connected with one section of main pipeline, the main pipeline before the microalgae algaecide enters the microwave irradiation device is also connected with a flocculating agent storage tank through a branch pipeline, a mixer is arranged at the intersection of the main pipeline and the branch pipeline, the microalgae liquid algaecide and a flocculating agent are mixed according to a certain proportion through the mixer, then the mixture enters the microwave irradiation device through the coil pipe, the liquid algaecide and the flocculating agent are subjected to flocculation reaction under the microwave irradiation, and then the mixed. The microwave-assisted flocculation harvesting method provided by the invention can greatly improve the flocculation efficiency of microalgae, can reduce the consumption of a flocculating agent, and is beneficial to the subsequent treatment of the harvested algaecide.
Description
Technical Field
The invention relates to the field of harvesting of microalgae algaecides, in particular to a harvesting system for assisting flocculation of microalgae algaecides by microwaves.
Background
The microalgae are micro organisms with high photosynthetic efficiency and rich nutritional ingredients such as protein, vitamins and polyunsaturated fatty acids. They can live in fresh water, sea water and soil. Microalgae biomass can be used in pharmaceuticals, feeds, fertilizers, and as a biodiesel feedstock. In addition, microalgae also exhibit excellent capabilities in wastewater treatment and greenhouse gas emission reduction. However, the commercial use of microalgae is still not economical enough. One of the key limiting factors is the microalgae harvesting method. Harvesting microalgae from microalgae liquid algaecides is a high energy consuming process. This is because microalgae cells have a small volume, a low culture concentration, negative charges on the cell surface, strong solution stability, and difficulty in natural precipitation of cells. The operating costs of microalgae cultivation systems are mainly derived from harvesting, in particular open pond cultivation systems. Microalgae harvesting costs are reported to account for nearly 20-30% of the total production cost. Therefore, the search for low cost harvesting methods has been the focus of attention of the microalgae industry.
Among the numerous recovery techniques, flocculation is considered the most promising method due to its low energy consumption and high efficiency. Can be collected by adding various flocculants into a microalgae liquid culture medium for neutralization, bridging, cleaning and the like. However, the efficiency of flocculation recovery is low at present, the ideal effect is difficult to achieve, and simultaneously, a large amount of flocculant needs to be added, which causes the pollution of biomass and the difficulty of downstream treatment.
Therefore, how to overcome the disadvantages, a method for effectively improving the flocculation recovery rate of the microalgae algicide and reducing the recovery cost is found, and a set of flocculation recovery system is constructed according to the method, so that the method becomes a key technology for solving the development bottleneck of the microalgae industry.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the system enhances the motion level of flocculant molecules, water molecules and microalgae cells in a solution through a microwave irradiation technology, increases the collision probability among the flocculant molecules, the water molecules and the microalgae cells, improves the bridging, cleaning and other effects of the flocculant and the microalgae cells, improves the microalgae flocculation recovery efficiency, and solves the problems of low recovery efficiency of the traditional microalgae algaecide, especially low recovery efficiency of the traditional flocculation method, simultaneously need to add a large amount of flocculant, and finally cause the pollution of biomass and the difficulty of downstream treatment.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a harvesting system of supplementary little algae algaecide flocculation of microwave, includes little algae algaecide reservoir and settling cask, little algae algaecide reservoir passes through the entry intercommunication of multistage trunk line with the settling cask, one of them section of trunk line on be connected with microwave irradiation device, be provided with the coil pipe in the microwave irradiation device inner chamber, the coil pipe is S-shaped and encircles and distribute in microwave irradiation device inner chamber, respectively connect one section trunk line at the both ends of coil pipe, still be connected with the flocculating agent reservoir through the small transfer line on the trunk line before little algae algaecide gets into microwave irradiation device, the blender is installed to trunk line and small transfer line intersection, mix little algae liquid algaecide and flocculating agent according to a certain proportion through the blender, then get into microwave irradiation device through the coil pipe and carry out microwave irradiation for a certain time, little algae liquid algaecide and flocculating agent take place flocculation reaction under microwave irradiation, then the mixed liquid that will take place flocculation reaction lets in And the concentrated algaecide after the sedimentation and collection of the sedimentation tank is discharged and collected from the bottom of the flocculation tank, and the supernatant is recycled.
The microwave irradiation device comprises a closed box body, wherein a microwave generator is arranged on each inner wall of the box body to ensure that mixed liquid in the main pipeline is fully irradiated by microwave beams emitted by the microwave irradiation device, and a microwave generator controller is arranged on the outer wall of the box body and controls the working state of the microwave generator.
The main pipelines connected with the two ends of the coil pipe in the box body are parallel to each other, the central lines of the two main pipelines are overlapped, a flow sensor is installed on the main pipeline at an inlet, the flow sensor is associated with a microwave generator controller, a flow signal detected by the flow sensor is transmitted to the microwave generator, when the microwave generator receives that the flow speed detected by the flow sensor is not zero, the microwave generator is controlled to start working, namely when the flow sensor detects that liquid in the main pipeline flows, the microwave generator controller controls the microwave generator to start working.
The mixer comprises a three-way connecting piece, wherein a liquid inlet, a liquid outlet and a liquid filling opening are arranged on the three-way connecting piece, a section of main pipeline is connected with the liquid inlet and the liquid outlet of the three-way connecting piece, the liquid filling opening of the three-way connecting piece is communicated with a branch pipeline, a drainage plate which points to the liquid inlet obliquely downwards is arranged in the inner cavity of the three-way connecting piece close to the liquid filling opening, an included angle of 30-45 degrees is formed between the drainage plate and the branch pipeline, a flocculating agent is drained to the liquid inlet through the drainage plate to avoid direct discharge of the flocculating agent, a flow baffle plate which points to the liquid filling opening obliquely upwards is arranged in the inner cavity of the three-way connecting piece close to the liquid inlet, microalgae algicide which is blocked by the flow baffle plate is directly discharged and is in hedonic with the flocculating agent drained by the drainage, the material outlet seam tail end is provided with a material blocking rod perpendicular to the flow direction of liquid in the material outlet seam, and the mixed solution is mixed again after flowing from two sides of the material blocking rod through the material blocking rod so as to improve the mixing uniformity of the mixed solution.
The drainage plate is located above the striker plate in an inclined mode, and the tail end of the drainage plate is located right above the striker plate.
Settling tank bottom install concentrated algae drain pipe, install first control valve on the concentrated algae drain pipe, open and shut so that gather concentrated algae liquid through first control valve control concentrated algae drain pipe, install the supernatant drain pipe on the settling tank lateral wall, install the second control valve on the supernatant drain pipe and realize the discharge of supernatant and recycle through opening and shutting of second control valve.
The main pipeline between little algae algaecide apontic pond and the blender on install first pump material device, install second pump material device on the small transfer line between flocculating agent holding vessel and the blender, install third pump material device on the main pipeline between microwave irradiation device and the settling cask, first pump material device, second pump material device and third pump material device all adopt the fluid pump, the power through controlling three fluid pump adjusts the flow velocity of liquid in the main pipeline and the volume of the flocculating agent that adds in the small transfer line.
The length of a main pipeline in the microwave irradiation device is L = Vt, V is the flowing speed of liquid in the main pipeline, and t is the irradiation time of the microwave irradiation device.
The invention has the beneficial effects that:
1. the microwave-assisted flocculation harvesting method provided by the invention can greatly improve the flocculation efficiency of microalgae.
2. The invention can reduce the flocculant consumption in the using process, and is beneficial to the subsequent treatment of the harvested algicide.
3. The invention can effectively reduce the microalgae algaecide flocculation recovery cost in the use process.
4. The microalgae flocculation harvesting system provided by the invention is simple in structure, easy to operate and easy to popularize and use.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a schematic view of the mounting structure of the mixer of the present invention.
Graphic notation: 1. a microalgae algaecide storage pool; 2. a first pumping device; 3. a mixer; 301. a drainage plate; 302. a material blocking rod; 303. a striker plate 4 and a flow sensor; 5. concentrating the algae to obtain a liquid outlet pipe; 501. a first control valve; 6. a supernatant liquid outlet pipe; 601. a second control valve; 7. a settling tank; 8. a third pumping device; 9. a coil pipe; 10. a microwave irradiation device; 11. a microwave generator controller; 12. a second pumping device; 13. a flocculant storage tank; 14. branch pipelines; 15. a main pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A harvesting system for assisting microalgae algaecide flocculation by microwaves comprises a microalgae algaecide storage pool 1 and a settling tank 7, wherein the microalgae algaecide storage pool 1 is communicated with an inlet of the settling tank 7 through a plurality of sections of main pipelines 15, one section of the main pipeline 15 is connected with a microwave irradiation device 10, a coil pipe 9 is arranged in an inner cavity of the microwave irradiation device 10, two ends of the coil pipe are respectively connected with one section of main pipeline, the length of the coil pipe in the microwave irradiation device 10 is L = Vt, V is the liquid flowing speed in the coil pipe, t is the irradiation time of the microwave irradiation device, a flocculating agent storage tank 13 is further connected to the main pipeline before the microalgae algaecide enters the microwave irradiation device through a branch pipeline 14, a mixer 3 is installed at the junction of the main pipeline and the branch pipeline 14, the microalgae liquid algaecide and a flocculating agent are mixed according to a certain proportion through the mixer 3, and then enter the microwave irradiation device 10 through the, the microalgae liquid algicide and the flocculating agent are subjected to flocculation reaction under microwave irradiation, then the mixed liquid subjected to flocculation reaction is introduced into the settling tank 7 through a section of main pipeline for settling and harvesting, the concentrated algicide after settling and harvesting in the settling tank 7 is discharged and collected from the bottom of the flocculating tank, and the supernatant is recycled.
The microwave irradiation device 10 comprises a closed box body, a microwave generator is arranged on each inner wall of the box body to ensure that mixed liquid in the main pipeline is fully irradiated by microwave beams emitted by the microwave irradiation device, a microwave generator controller 11 is arranged on the outer wall of the box body, and the working state of the microwave generator is controlled by the microwave generator controller 11.
The main pipelines 15 connected at the inlet and the outlet of the box body are parallel to each other, the central lines of the two main pipelines 15 are overlapped, the main pipeline at the inlet is provided with the flow sensor 4, the flow sensor 4 is associated with the microwave generator controller 11, a flow signal detected by the flow sensor 4 is transmitted to the microwave generator, when the microwave generator receives that the flow speed detected by the flow sensor is not zero, the microwave generator is controlled to start working, namely when the flow sensor detects that liquid in the main pipeline flows, the microwave generator controller 11 controls the microwave generator to start working.
The mixer comprises a three-way connecting piece 3, wherein a liquid inlet, a liquid outlet and a liquid filling opening are arranged on the three-way connecting piece, a section of main pipeline is connected with the liquid inlet and the liquid outlet of the three-way connecting piece, the liquid filling opening of the three-way connecting piece is communicated with a branch pipeline, a drainage plate 301 which points to the liquid inlet obliquely downwards is arranged in the inner cavity of the three-way connecting piece close to the liquid filling opening, an included angle of 30 degrees is formed between the drainage plate 301 and the branch pipeline, a flocculating agent is drained to the liquid inlet through the drainage plate 301 to avoid direct discharge of the flocculating agent, a flow baffle plate 303 which points to the liquid filling opening obliquely upwards is arranged in the inner cavity of the three-way connecting piece close to the liquid filling opening, microalgae algicide which is blocked by the flow baffle plate 303 is directly discharged and is subjected to hedging with the flocculating agent drained by the drainage plate to realize full mixing, the, drainage plate and striker plate interval parallel form with the ejection of compact seam of liquid outlet intercommunication, ejection of compact seam end be provided with the ejection of compact seam in liquid flow direction vertically keep off material stick 302, through keeping off blockking of material stick make mixed solution mix the even degree in order to improve mixed solution's mixture once more after keeping off material stick both sides flow.
7 bottom of settling cask install concentrated algae drain pipe 5, install first control valve 501 on the concentrated algae drain pipe 5, open and shut so that gather concentrated algae liquid through first control valve 501 control concentrated algae drain pipe, install supernatant drain pipe 6 on 7 lateral walls of settling cask, install the second control valve 601 on the supernatant drain pipe 6 and realize the discharge of supernatant through opening and shutting of second control valve 601 and recycle.
Little algae algaecide hold up 1 and the trunk line between the blender 3 on install first pump material device 2, install second pump material device 12 on the small transfer line between flocculating agent holding vessel and the blender, install third pump material device 8 on the trunk line between microwave irradiation device and the settling cask, first pump material device 2, second pump material device 12 and third pump material device 8 all adopt the liquid pump, the power through controlling three liquid pump adjusts the flow velocity of liquid in the trunk line and the amount of the flocculating agent that adds in the small transfer line.
Storing a cultured chlorella algicide (chlorella cell biomass is characterized by absorbance of 680nm, namely OD680= 0.590) in a microalgae algicide storage pool, storing a ferric trichloride solution with a flocculating agent concentration of 50g/L in a flocculating agent storage tank, simultaneously starting a first pump device 2 and a second pump device 12, enabling the chlorella algicide and the ferric trichloride solution to enter a mixer according to a ratio of 200: 1 and be completely mixed, enabling the mixed liquid to enter a coil pipe 9 in a microwave irradiation device along a main pipeline, enabling a flow sensor to detect the liquid flow to send a signal to a microwave generator controller, controlling the microwave generator to work by the microwave generator controller, namely starting a microwave irradiation device 10, keeping the liquid flow rate to enable the irradiation time of the chlorella algicide and ferric trichloride mixed solution in an S-shaped pipeline to be 30 seconds, and pumping the mixed solution into a settling tank 7 by a third pump device 8 after the irradiation of the mixed solution is finished, standing for 30 minutes for separation, allowing the concentrated algicide to settle at a concentrated algae liquid outlet pipe 5 at the bottom of the settling tank to be discharged, allowing the supernatant to be discharged through a supernatant liquid outlet pipe 6, and measuring the absorbance value of the supernatant at 680nm, namely OD680=0.056 by spectrophotometry, wherein compared with the absorbance of the original chlorella algicide, the flocculation recovery efficiency is (0.590-0.056)/0.590 x 100= 90.5%.
Repeating the above steps without starting the microwave irradiation device 10 and increasing the usage amount of the flocculating agent, wherein the flocculated supernatant OD680=0.246 after the operation, and the flocculation concentration efficiency is (0.590-0.246)/0.590 x 100= 58.3%. Therefore, the visible microwave irradiation assisted flocculation method can greatly improve the flocculation recovery efficiency of the microalgae algicide.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a recovery system of supplementary little algae algaecide flocculation of microwave, includes little algae algaecide reservoir and settling cask, little algae algaecide reservoir communicates its characterized in that through the entry of multistage trunk line with the settling cask: one section of the main pipeline is connected with a microwave irradiation device, a coil pipe is arranged in an inner cavity of the microwave irradiation device, two ends of the coil pipe are respectively connected with one section of the main pipeline, a flocculating agent storage tank is connected to the main pipeline before the microalgae algicide enters the microwave irradiation device through a branch pipeline, and a mixer is installed at the intersection of the main pipeline and the branch pipeline.
2. The harvesting system for microwave-assisted microalgae algaecide flocculation according to claim 1, wherein: the microwave irradiation device comprises a closed box body, wherein each inner wall of the box body is provided with a microwave generator, and the outer wall of the box body is provided with a microwave generator controller.
3. The harvesting system for microwave-assisted microalgae algaecide flocculation according to claim 2, wherein: the main pipelines connected with the two ends of the coil pipe in the box body are parallel to each other, the central lines of the two main pipelines are overlapped, a flow sensor is installed on the main pipeline at an inlet, the flow sensor is associated with a microwave generator controller, and when the flow sensor detects that liquid in the main pipeline flows, the microwave generator controller controls the microwave generator to start working.
4. The harvesting system for microwave-assisted microalgae algaecide flocculation according to claim 1, wherein: the mixer comprises a three-way connecting piece, wherein a liquid inlet, a liquid outlet and a liquid filling opening are formed in the three-way connecting piece, a section of main pipeline is connected to the liquid inlet and the liquid outlet of the three-way connecting piece, the liquid filling opening of the three-way connecting piece is communicated with a branch pipeline, a drainage plate which points to the liquid inlet obliquely downwards is arranged in the inner cavity of the three-way connecting piece close to the liquid filling opening, an included angle of 30-45 degrees is formed between the drainage plate and the branch pipeline, a flow baffle plate which points to the liquid filling opening obliquely upwards is arranged in the inner cavity of the three-way connecting piece close to the liquid inlet, the flow baffle plate and the main pipeline form an included angle of 30-50 degrees, a discharge seam communicated with the.
5. The harvesting system for microwave-assisted microalgae algaecide flocculation according to claim 4, wherein: the drainage plate is located above the striker plate in an inclined mode, and the tail end of the drainage plate is located right above the striker plate.
6. The recovery system for microwave-assisted microalgae algaecide flocculation according to any one of claims 1 to 5, wherein: settling tank bottom install concentrated algae drain pipe, install first control valve on the concentrated algae drain pipe, install the supernatant drain pipe on the settling tank lateral wall, install the second control valve on the supernatant drain pipe.
7. The recovery system for microwave-assisted microalgae algaecide flocculation according to any one of claims 1 to 5, wherein: the main pipeline between the microalgae algicide storage pool and the mixer is provided with a first pumping device, the branch pipeline between the flocculant storage tank and the mixer is provided with a second pumping device, and the main pipeline between the microwave irradiation device and the settling tank is provided with a third pumping device.
8. The recovery system for microwave-assisted microalgae algaecide flocculation according to any one of claims 1 to 5, wherein: the length of a main pipeline in the microwave irradiation device is L = Vt, V is the flowing speed of liquid in the main pipeline, and t is the irradiation time of the microwave irradiation device.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110263883A1 (en) * | 2010-04-06 | 2011-10-27 | Arizona Board Of Regents For And On Behalf Of Arizona State University | Extraction With Fractionation of Oil and Co-Products from Oleaginous Material |
| CN104195046A (en) * | 2014-09-05 | 2014-12-10 | 北京联合大学 | Microalgae flocculation and sedimentation harvesting method |
| CN206751490U (en) * | 2017-05-25 | 2017-12-15 | 铜陵千衍新材料科技有限公司 | Automatic hybrid liquid mixer |
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2020
- 2020-06-01 CN CN202010482374.7A patent/CN111548930A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110263883A1 (en) * | 2010-04-06 | 2011-10-27 | Arizona Board Of Regents For And On Behalf Of Arizona State University | Extraction With Fractionation of Oil and Co-Products from Oleaginous Material |
| CN104195046A (en) * | 2014-09-05 | 2014-12-10 | 北京联合大学 | Microalgae flocculation and sedimentation harvesting method |
| CN206751490U (en) * | 2017-05-25 | 2017-12-15 | 铜陵千衍新材料科技有限公司 | Automatic hybrid liquid mixer |
Non-Patent Citations (2)
| Title |
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| 朱承彬: "微波强化混凝去除水中藻类的实验研究", 《中国优秀博硕士学位论文全文数据库(硕士)》 * |
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Application publication date: 20200818 |