CN112125378B - Blue algae membrane dehydration process and polymer membrane - Google Patents
Blue algae membrane dehydration process and polymer membrane Download PDFInfo
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- CN112125378B CN112125378B CN202011022503.0A CN202011022503A CN112125378B CN 112125378 B CN112125378 B CN 112125378B CN 202011022503 A CN202011022503 A CN 202011022503A CN 112125378 B CN112125378 B CN 112125378B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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Abstract
The invention discloses a blue algae membrane dehydration process, and a device used in the process comprises a polymer membrane filtering bin body, an acoustic wave generating device, an acoustic wave isolation mounting bracket, a complete machine frame and a dehydration collection bin for receiving dehydrated water; the process comprises the following steps: 1) the sound wave generating device generates low-frequency sound waves which promote the polymer membrane filtering cabin body to generate low-frequency vibration; 2) introducing blue algae-water mixed liquid into the polymer membrane filtration bin through an input pipeline, wherein under the action of low-frequency sound waves, free water and blue algae cells generate different forced vibrations and rapidly pass through a polymer membrane; the cyanobacteria cells with complete structures move along one side of the polymer membrane in a single direction and are gathered at the output pipeline; 3) the free water passing through the polymer membrane falls to a dehydration collection bin. The process separates the blue algae from the natural water body under the non-pressure state through a polymer membrane structure without the help of chemical agents, the removal rate of free water exceeds 90 percent, and the algae content of discharged water is lower than 0.05 percent.
Description
Technical Field
The invention relates to the technical field of blue algae dehydration, in particular to a blue algae membrane dehydration process and a polymer membrane.
Background
After the blue algae is fished, free water needs to be removed, and the algae residues are transported outside. At present, the algae-laden water separation technology is added with various medicaments, and then is dehydrated by belt filtration extrusion or centrifugal dehydration through the reaction process of air flotation or sedimentation. These techniques bring about various disadvantages: firstly, a large amount of added medicaments are not recycled, and most of the added medicaments enter the algae residues, so that the subsequent drying treatment and resource utilization are seriously influenced; a small amount of the water enters a water body, and irreversible chemical pollution is generated to the natural water body; some medicaments also have a wall-breaking effect, so that a large amount of algal toxins are released into a water body, and biotoxin pollution which is more serious than organic pollution is generated. Secondly, the actual dehydration rate in the separation and dehydration process is not high, the water content of the obtained algae residue is often over 93 percent, and most of the water content is in a flocculation state, so that the transportation cost and the drying cost of the algae residue are greatly increased, and the algae residue is easy to rapidly smell and deteriorate. Thirdly, high cost, high energy consumption and low productivity. Taking a certain type of high-speed centrifugal dehydrator as an example, the installed power of the high-speed centrifugal dehydrator is as high as 55KW, the actual processing capacity is only 12 cubic meters per hour, but the energy consumption is as high as 35-45 KWh per hour, the noise exceeds 85dB, and the comprehensive cost of processing one ton of algae water reaches more than 60 yuan. Finally, in actual fishing, the concentration of the blue algae can only reach 1000-2000 ten thousand per liter, and the prior art cannot effectively separate the blue algae with low concentration. In a word, in the process of blue algae treatment, the existing algae-laden water separation process not only severely restricts the fishing amount of blue algae, but also blocks the blue algae resource utilization way. In order to realize energy-saving, environment-friendly, green, efficient and sustainable blue algae treatment and resource development, subversive and brand-new algae-water separation process and device must be developed.
Chinese patent with the publication number of CN104370431B discloses a blue algae dehydration method, which comprises the steps of ultrasonic treatment, flocculant addition and filter pressing dehydration, and specifically comprises the steps of carrying out ultrasonic treatment on blue algae for 2-6 min; adding a flocculating agent into the blue algae after ultrasonic treatment, and uniformly stirring; and (4) carrying out filter pressing dehydration on the blue algae added with the flocculating agent. The method disclosed by the invention can greatly reduce the volume of the blue algae, has no change in heat value and high dehydration degree, has the advantages of high processing speed, simplicity in operation, convenience for large-scale production and the like, and has wide application prospect. The method adds multiple medicinal agents, and dewatering by belt filtration and squeezing or centrifugal dewatering. The use of a large amount of medicament can seriously influence the subsequent drying treatment and resource utilization; and irreversible chemical pollution and biotoxin pollution are generated to natural water bodies.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a process for dehydrating a blue algae membrane and a polymer membrane, wherein the process can separate the blue algae from a natural water body under a non-pressure state through a polymer membrane structure without the help of chemical agents, the removal rate of free water exceeds 90 percent, and the algae content of discharged water is lower than 0.05 percent. The high molecular membrane structure realizes that free water in the blue algae can rapidly pass through the membrane layer through low-frequency sound waves, and blue algae cells rapidly move towards a specified direction on one side of the high molecular membrane, so that the high-flux algae-water separation process is realized. In the device, no moving part or fluid pressurizing part is arranged, the device adapts to algae-laden water separation operation under different concentrations by adjusting the frequency of low-frequency sound waves, the working load of each unit can reach 10-30 cubic meters per hour, and the device is stable and reliable in operation.
In order to achieve the purpose, the invention provides the following technical scheme: a device used in the process comprises a polymer membrane filtering bin body, a sound wave generating device, a sound wave isolation mounting bracket, a complete machine frame and a dehydration collecting bin for receiving dehydrated water; the polymer film filtering bin body is installed in the whole frame through a sound wave isolation installation support, and the sound wave generating device is installed on the polymer film filtering bin body; meanwhile, the dehydration collection bin is arranged in the frame of the whole machine and is positioned below the polymeric membrane filtration bin body; the polymeric membrane filtering bin is also provided with an input pipeline and an output pipeline, and the dehydration collecting bin is provided with a discharge pipeline;
the process comprises the following steps:
1) turning on the sound wave generating device to generate low-frequency sound waves, wherein the low-frequency sound waves promote the polymer membrane filtering cabin body to generate low-frequency vibration;
2) introducing blue algae-water mixed liquid into the polymer membrane filtration bin through an input pipeline, wherein under the action of low-frequency sound waves, free water and blue algae cells generate different forced vibrations and rapidly pass through a polymer membrane; the cyanobacteria cells with complete structures can not pass through the polymer film but move along one side of the polymer film in a single direction and gather at an output pipeline of the polymer film filtering bin body and are discharged through the output pipeline;
3) the free water passing through the polymer film falls to a dehydration collection bin and is discharged through a discharge pipeline of the dehydration collection bin.
Preferably, the frequency of the low-frequency sound wave is 20-120 Hz.
Preferably, one end of the polymeric membrane filtration cabin body is provided with the input pipeline, and one end of the polymeric membrane filtration cabin body, which is opposite to the input pipeline, is provided with the output pipeline.
Preferably, the lower portion of the acoustic isolation mounting bracket is connected to the unitary frame by a shock absorber.
The preparation method of the polymer membrane for dehydrating the blue algae membrane comprises the following steps:
1) taking a high-strength steel wire as a framework, and forming a metal framework through surface degreasing and phosphorization treatment;
2) in a high-temperature environment, a high polymer material is attached to a metal framework through an electrostatic spraying process, so that a microscopic three-dimensional reticular labyrinth structure is formed; the internal surface area of the three-dimensional reticular labyrinth structure is 2-15 times of the whole external surface area of the polymer film, and the surface free energy exceeds 6.5mJ/m 2 。
Preferably, the temperature of the high-temperature environment is 160-300 ℃.
Preferably, the internal surface area of the three-dimensional reticular labyrinth structure is 5-12 times of the external surface area of the whole polymer membrane.
Preferably, the surface free energy is 9.5mJ/m or more 2 。
Preferably, the aperture of the polymer membrane is less than 90% of the cyanobacteria cells.
In conclusion, the invention has the following beneficial effects:
1. the technological process of the invention does not add chemical agents, does not destroy cyanobacterial cells, does not generate the release effect of algal toxins, and maximizes the environmental protection characteristic of the algae-water separation process;
2. the device does not pressurize or separate solid from liquid and squeeze the algae-laden water mixed solution, does not have mechanical moving parts, reduces the energy consumption of algae-laden water separation to the maximum extent, and improves the reliability of the equipment at the same time;
3. the device of the invention carries out membrane separation by the physical property difference of the blue algae cells and the free water, realizes that the free water removal rate is more than 90 percent, and the blue algae resource cost is acceptable;
4. the dehydrated blue algae obtained after the treatment of the invention does not contain various flocculating agents, curing agents, binding agents and the like, so the purification is rapid, the components are natural, and the invention opens a door for high-value application of the algae protein.
Drawings
FIG. 1 is a schematic view of the present invention.
Reference numerals: 1. a polymer film filtering bin body; 2. an acoustic wave generating device; 3. a sound wave isolation mounting bracket; 4. a complete machine frame; 5. a dehydration collection bin; 6. an input pipe; 7. an output pipe; 8. and (4) a discharge pipeline.
Detailed Description
The invention is further illustrated with reference to the accompanying drawings.
The embodiment discloses a blue algae membrane dehydration device, which comprises a polymer membrane filtration cabin body 1, an acoustic wave generating device 2, an acoustic wave isolation mounting bracket 3, a complete machine frame 4 and a dehydration collection cabin 5 for receiving dehydrated water, wherein the polymer membrane filtration cabin body 1 is provided with a water inlet and a water outlet; the polymer film filtering bin body 1 is arranged in a whole machine frame 4 through a sound wave isolation mounting bracket 3, and the sound wave generating device 2 is arranged on the polymer film filtering bin body 1; meanwhile, the dehydration collection bin 5 is arranged in the whole machine frame 4 and is positioned below the polymeric membrane filtration bin body 1; still be equipped with input pipeline 6 and output pipeline 7 on the polymer film filters the storehouse, and output pipeline 7 sets up in the bottom in polymer film filters the storehouse, is equipped with discharge pipe 8 on the storehouse 5 is collected in the dehydration. Wherein, the one end setting of the polymer film filtering storehouse body 1 the input pipeline 6, the one end setting relative with input pipeline 6 on the polymer film filtering storehouse body 1 output pipeline 7, and sound wave generating device 2 sets up on the polymer film filtering storehouse body 1 and be close to input pipeline 6, so, the flow distance of extension blue alga water mixed liquid that can great limit in the polymer film filtering storehouse body 1, and then can make algae water realize better separation.
Preferably, the lower portion of the acoustic isolation mounting bracket 3 is connected to the unitary frame 4 by a shock absorber. The structure of the shock absorber can be seen in chinese patent application publication No. CN107237852A or other shock absorbing structures.
Alternatively, the device may be fitted directly to a car or boat; or, the device can be directly skid-mounted to the shore, namely the assembly position of the device is flexible, and the device can be adjusted according to actual conditions so as to be better suitable for application scenarios.
The blue algae membrane dewatering process and the blue algae membrane dewatering device include the following steps:
1) turning on the sound wave generating device 2 to generate low-frequency sound waves, and enabling the high-molecular membrane filtering cabin body to generate low-frequency vibration by the low-frequency sound waves;
2) introducing blue algae water mixed liquid into the polymer membrane filtration bin body 1 through the input pipeline 6, wherein under the action of low-frequency sound waves, the frequency of the low-frequency sound waves is 20-120 Hz, free water and blue algae cells generate different forced vibrations, and the free water quickly passes through a polymer membrane on the polymer membrane filtration bin body 1; blue algae cells with an integral structure can not pass through the polymer film but move rapidly and unidirectionally along one side of the polymer film and are gathered at an output pipeline 7 of the polymer film filtering bin body 1 and discharged into the dehydration collection bin 5 through the output pipeline 7;
3) the free water passing through the polymer membrane falls to the dehydration collection bin 5 and is discharged through a discharge pipe 8 of the dehydration collection bin 5.
The manufacturing method of the polymer film in the technical scheme comprises the following steps:
1) taking a high-strength steel wire as a framework, and performing surface degreasing and phosphorization treatment to form a metal framework;
2) attaching a high polymer material to a metal framework by an electrostatic spraying process at the temperature of 160-300 ℃ to form a microscopic three-dimensional reticular labyrinth structure; the internal surface area of the three-dimensional reticular labyrinth structure is 2-15 times of the whole external surface area of the polymer film, and the surface free energy exceeds 6.5mJ/m 2 。
Preferably, the internal surface area of the three-dimensional reticular labyrinth structure is 5-12 times of the external surface area of the whole polymer membrane, and the free energy of the solid surface is more than or equal to 9.5mJ/m 2 。
The working principle is as follows: firstly, the sound wave generating device 2 generates sound waves, the sound waves prompt the polymer membrane filtering bin body 1 to generate low-frequency vibration, and meanwhile, algae-laden water mixed liquid is introduced through the input pipeline 6 on the polymer membrane filtering bin body 1. Under the action of sound waves, free water and blue algae cells generate different forced vibration, and the reasons for the forced vibration are as follows: the water and the living blue algae cells have different physical properties (including density, dynamic viscosity, kinematic viscosity and Reynolds number) and can generate anisotropic forced vibration under the action of low-frequency sound waves; differentiation will thus occur across the polymeric membrane: make free water fast through the polymer film on the one hand, the blue alga cell that on the other hand has complete structure can't pass through the polymer film but follows the quick unidirectional movement of one side of polymer film, assembles in the output pipeline 7 department that the polymer film filtered storehouse body 1, and free water through the polymer film falls to dehydration collection storehouse 5 to discharge through the discharge tube 8 of dehydration collection storehouse 5. The reason why the cyanobacteria cells with the complete structure rapidly move in a single direction along one side of the polymer membrane is as follows: the cell wall of the blue algae has negative charges and generates charge repulsion with a polymer film; secondly, the solid surface of the polymer film has lower free energy and hydrophilic property, and water can be smoothly infiltrated and pass through; thirdly, the aperture of the polymer membrane is less than 90 percent of the cyanobacteria cells.
In the technical scheme, as the algae-laden water mixture with different concentrations has different physical properties, the low-frequency sound wave frequency needs to be adjusted during membrane separation, preferably, the adjustment range of the low-frequency sound wave frequency is 20-120 Hz, so that the free water in the mixture can generate effective forced vibration separation motion, and the optimal algae-laden water separation effect is kept.
The invention has the following beneficial effects:
1. the technological process of the invention does not add chemical agents, does not destroy cyanobacterial cells, does not generate the release effect of algal toxins, and maximizes the environmental protection characteristic of the algae-water separation process;
2. the device does not pressurize or separate solid from liquid and squeeze algae-water mixed liquid, does not have mechanical moving parts, reduces the algae-water separation energy consumption to the maximum extent, and improves the reliability of the equipment;
3. the device of the invention carries out membrane separation by the physical property difference of the blue algae cells and the free water, realizes that the free water removal rate is more than 90 percent, and the blue algae resource cost is acceptable;
4. the dehydrated blue algae obtained after treatment of the invention does not contain various flocculants, curing agents, binding agents and the like, so the purification is rapid, and the components are natural, thereby opening the door for high-value application of the algae protein.
The specific embodiment is as follows: the MF-500 type blue algae magic separation equipment is an algae-water separation module which is specially matched with an ICSE blue algae resource platform. The device is integrally installed in a 40ft container, the self weight is 8.95 tons, the system power consumption is 9KW, the water separation capacity of 25 cubic algae per hour can be completed, the free water removal rate exceeds 90 percent, the algae content of discharged water is lower than 0.05 percent, and powerful support is provided for large-scale blue algae recycling.
The directions given in the present embodiment are merely for convenience of describing positional relationships between the respective members and the relationship of fitting with each other. The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. The blue algae membrane dehydration process is characterized by comprising the following steps: the device used in the process comprises a polymer film filtering bin body (1), a sound wave generating device (2), a sound wave isolation mounting bracket (3), a complete machine frame (4) and a dehydration collecting bin (5) for receiving dehydrated water; the polymer film filtering bin body (1) is installed in a whole machine frame (4) through a sound wave isolation installation support (3), and the sound wave generating device (2) is installed on the polymer film filtering bin body (1); meanwhile, the dehydration collection bin (5) is arranged in the whole machine frame (4) and is positioned below the polymer film filtering bin body (1); the polymeric membrane filtering bin body (1) is also provided with an input pipeline (6) and an output pipeline (7), and the dehydration collection bin (5) is provided with a discharge pipeline (8);
the process comprises the following steps:
1) turning on the sound wave generating device (2) to generate low-frequency sound waves of 20-120 Hz, and enabling the polymer film filtering bin body (1) to generate low-frequency vibration by the low-frequency sound waves;
2) introducing blue algae water mixed liquid into the polymer membrane filtering bin body (1) through an input pipeline (6), wherein free water and blue algae cells generate different forced vibration under the action of low-frequency sound waves, and the polymer membrane has hydrophilic characteristics and rapidly passes through the polymer membrane; the cyanobacteria cell wall has negative charges and generates charge repulsion with the polymer film, and the cyanobacteria cell with an integral structure can not move in a single direction along one side of the polymer film through the polymer film and is gathered at an output pipeline (7) of the polymer film filtering bin body (1) and is discharged through the output pipeline (7);
3) the free water passing through the polymer membrane falls to a dehydration collection bin (5) and is discharged through a discharge pipeline (8) of the dehydration collection bin (5);
the polymer film has a microcosmic three-dimensional reticular labyrinth structure formed by taking high-strength steel wires as a framework, the internal surface area of the microcosmic three-dimensional reticular labyrinth structure is 2-15 times of the whole external surface area of the polymer film, and the surface free energy exceeds 6.5mJ/m 2 And the aperture of the polymer membrane is less than 90 percent of the cyanobacteria cells.
2. The process for dehydrating the blue algae membrane according to claim 1, which is characterized in that: the input pipeline (6) is arranged at one end of the polymer film filtering bin body (1), and the output pipeline (7) is arranged at one end, opposite to the input pipeline (6), of the polymer film filtering bin body (1).
3. The process for dehydrating the blue algae membrane according to claim 1, which is characterized in that: the lower part of the sound wave isolation mounting bracket (3) is connected with the integral frame (4) through a shock absorber.
4. The polymer membrane for blue algae membrane dehydration is characterized in that: the manufacturing method comprises the following steps:
1) taking a high-strength steel wire as a framework, and performing surface degreasing and phosphorization treatment to form a metal framework;
2) attaching the high polymer material to the gold by an electrostatic spraying process in a high-temperature environment of 160-300 DEG CBelongs to the framework, and further forms a microscopic three-dimensional reticular labyrinth structure; the internal surface area of the microscopic three-dimensional reticular labyrinth structure is 2-15 times of the whole external surface area of the polymer film, and the surface free energy exceeds 6.5mJ/m 2 ；
The polymer membrane has hydrophilic property and can generate charge repulsion with negative charges carried by walls of the blue algae cells;
the aperture of the polymer membrane is less than 90 percent of the cyanobacteria cells.
5. The polymer membrane for dehydrating a blue algae membrane according to claim 4, wherein: the internal surface area of the three-dimensional reticular labyrinth structure is 5-12 times of the external surface area of the polymer film.
6. The polymer membrane for dehydrating a cyanobacteria membrane according to claim 4, which is characterized in that: the surface free energy is more than or equal to 9.5mJ/m 2 。
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