Shape memory polymer bionic water lily light-driven bacteria-algae wastewater treatment system

Abstract

The application relates to a shape memory polymer biomimetic lotus light-driven bacterial-algal sewage treatment system, and relates to a sewage treatment system. The application is used for improving light management efficiency, solving the problems of uneven light illumination and high operation cost in the prior art, and comprises a plurality of petals, a plurality of air bag structures and a bottom support. The plurality of petals are sequentially stacked from inside to outside to form a lotus structure, and the roots of each petal are connected with the bottom support through the air bag structure. The petals are made of shape memory polymer materials, and the inner and outer surfaces of the petals are coated with rare earth nano-particle paint. The application combines light management and biomimetic technology, dynamically controls light and buoyancy, realizes efficient management of the algal and bacterial symbiotic system in sewage, improves sewage treatment efficiency, reduces energy consumption and reduces carbon dioxide emission. The application is applied to the technical field of sewage treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to a sewage treatment system, in particular to a shape memory polymer biomimetic lotus light-driven bacteria-algae sewage treatment system, and belongs to the technical field of sewage treatment. BACKGROUND

[0002] Algae-bacteria symbiosis (ABS) is a technology that utilizes the symbiotic relationship between algae and bacteria to achieve wastewater treatment and resource recovery. Under light conditions, algae convert carbon dioxide and dissolved oxygen in water into oxygen and organic matter through photosynthesis, while bacteria use this oxygen to degrade organic pollutants. Such a symbiotic relationship not only improves the efficiency of wastewater treatment, but also reduces carbon dioxide emissions and energy consumption.

[0003] Light management plays a crucial role in algae-bacteria symbiosis systems. Algae are very sensitive to light, and their growth and photosynthesis efficiency are directly affected by light intensity, uniformity, and duration. Traditional light distribution is uneven, making it difficult to ensure uniform light transmission to algae, resulting in low light efficiency and affecting their growth and photosynthesis efficiency. Maintaining the stability and uniformity of light conditions usually requires a large amount of external energy, increasing the operating cost of the system. Existing light management systems usually require a large amount of energy to maintain light intensity and uniformity, resulting in high operating costs. At the same time, in order to achieve optimization of light, the existing system design is usually complex, not easy to maintain and manage. In addition, the demand for algae photosynthesis and the demand for bacteria to degrade organic matter are not matched in time and space, which further increases the difficulty of system optimization. SUMMARY

[0004] To solve the above technical problems in the prior art, the present application uses ethylene-co-vinyl acetate (EVA) / silver nanowire composite shape memory polymer and rare earth nano coating material to propose a shape memory polymer biomimetic lotus light-driven bacteria-algae sewage treatment system.

[0005] The technical solution adopted by the present application to solve the above problems is:

[0006] The present application comprises a plurality of petals, a plurality of air bag structures, and a bottom support. The plurality of petals are sequentially stacked from inside to outside to form a lotus structure, and the root of each petal is connected to the bottom support through the air bag structure. The petals are made of shape memory polymer material, and the inner and outer surfaces of the petals are coated with rare earth nano-particle paint.

[0007] Further, the shape memory polymer material is prepared by the following method:

[0008] The silver nanowire is uniformly doped in the EVA matrix by using a polyol reduction mixed hot-pressing method, the mixed silver nanowire and EVA particles are mixed, and then are put into a hot-pressing mold to be hot-pressed into a shape under certain temperature and pressure, so that the EVA / silver nanowire composite shape memory polymer is obtained.

[0009] Further, the forming temperature is 120 DEG C to 150 DEG C, and the forming pressure is 1 MPa.

[0010] Further, the rare earth nanoparticle coating is selected from a rare earth material cerium-doped yttrium aluminum garnet (Ce) having high light absorption and emission capacity, and the Ce-doped yttrium aluminum garnet (YAG) rare earth nanoparticles are synthesized by using a chemical precipitation method.

[0011] Further, the synthesized rare earth nanoparticles are uniformly dispersed in a solution to prepare a sol suitable for coating, and the sol is uniformly coated on the petal surface made of the EVA / silver nanowire composite material by using a spraying method, and then is subjected to a solidification treatment.

[0012] Further, the bottom supporting structure is a circular truncated cone structure made of solid light acrylic material.

[0013] The present application has the following advantages:

[0014] 1. Under the light condition in the daytime, the petals are opened from the completely closed state in five minutes, the surface temperature of the EVA composite material is rapidly increased to drive the deformation, and under the dark condition at night, the petals are closed from the completely opened state in 10 minutes, the surface temperature of the EVA composite material is reduced to restore the initial shape.

[0015] 2. The light transmission test shows that the rare earth nano coating effectively releases the stored light energy when the petals are closed, and the underwater light sensor records significant light energy transmission.

[0016] 3. The buoyancy adjusting device ensures the stable opening and closing of the petals under different light conditions, and improves the light management ability of the sewage treatment system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present application;

[0018] Figure 2 is a schematic diagram of the petal surface;

[0019] Figure 3 is a schematic diagram of a petal cross section;

[0020] Figure 4 is a comparison of underwater light intensity of the algal system;

[0021] Figure 5 is a comparison of chlorophyll concentration.

[0022] In the figure: 1-petal; 1-1-EVA / silver nanowire composite material; 1-2-rare earth nano coating; 2-air bag structure; 3-bottom support. DETAILED DESCRIPTION

[0023] Detailed implementation one: combination Figures 1 to 3 In this embodiment, the system includes a light-driven device and a buoyancy adjusting device. The light-driven device includes a plurality of petals 1, which are stacked in a lotus structure from inside to outside. The petals 1 are made of shape memory polymer material, and the inner and outer surfaces of the petals 1 are coated with rare earth nano-particle paint. The buoyancy adjusting device includes a plurality of air bag structures 2 and a bottom support 3. The root of each petal 1 is connected to the bottom support 3 through the air bag structure 2.

[0024] The present application adopts a light-driven mechanism. Under daylight conditions, the light-driven device absorbs light energy and converts it into heat energy. The petals made of EVA / silver nanowire composite material 1-1 deform, the air bag 2 inflates to increase buoyancy, the petals 1 open and float to the water surface, and the rare earth nano coating 1-2 absorbs and stores light energy. Under dark conditions at night: the light-driven device releases stored light energy, the EVA / silver nanowire composite material 1-1 restores deformation, the air bag 2 deflates to reduce buoyancy, the petals 1 gradually close and sink underwater. The rare earth nano coating 1-2 releases light energy, which is guided out by the reflective layer, promoting photosynthesis of the underwater algal system, thereby improving the effect of sewage treatment.

[0025] Detailed implementation two: the shape memory polymer material in this embodiment is prepared by the following method: using EVA as the shape memory polymer base material, uniformly doping silver nanowires in the EVA matrix by the polyol reduction mixing hot pressing method, mixing the mixed silver nanowires with EVA particles, and placing them in a hot pressing mold to hot press under certain temperature and pressure to obtain an EVA / silver nanowire composite material.

[0026] EVA is a kind of excellent thermal-driven shape memory polymer material with low cost and moderate Young's modulus, while silver nanowire is a kind of nanomaterial with high specific surface area, thermal conductivity and nanometer optical properties. Light will make silver nanowire quickly absorb heat, and EVA / silver nanowire composite material will quickly heat up, triggering the thermal field response characteristics of EVA, and then having the light response characteristics to generate shape memory effect. The EVA / silver nanowire composite material is made into a film to adapt to the structural design requirements of the bionic water lily.

[0027] Specific embodiment three: the preparation of the rare earth nanoparticle coating in this embodiment is as follows: a rare earth material cerium-doped yttrium aluminum garnet (Ce) with high light absorption and emission capacity is selected, and a Ce-doped yttrium aluminum garnet (YAG) rare earth nanoparticle is synthesized by using a chemical precipitation method.

[0028] The synthesized rare earth nanoparticles are uniformly dispersed in a solution to prepare a sol suitable for coating, and are uniformly coated on the petal surface made of EVA / silver nanowire composite material by a spraying method, and are subjected to a solidification treatment.

[0029] The rare earth luminescent material has the advantages of strong absorption capacity, high conversion efficiency, and strong emission capacity from ultraviolet light to infrared light, especially in the visible light region. During the day, the rare earth nanoparticle coating 1-2 on the surface of the petal 1 absorbs solar energy and converts it into a photothermal effect, driving the EVA composite material to deform, and the petal 1 opens. At this time, the rare earth nanoparticle coating converts and stores light energy, and part of the energy is conducted to the underwater algal system through the silver nanowire. At night, the light is weak, the EVA composite material cools down, the petal 1 gradually closes, and the rare earth nanoparticle coating 1-2 releases the stored light energy, which is reflected through the inner and outer surfaces of the petal 1 to supply the underwater algal system. At this time, the inner layer of rare earth material guides the light energy out through the reflection layer to ensure effective transmission of light energy and promote photosynthesis of the underwater algal system.

[0030] Specific embodiment four: combined with Figure 1 In this embodiment, the buoyancy adjusting device includes a plurality of air bags 2 and a bottom support 3. An air bag 2 is connected to the bottom end of each petal 1. The air bags 2 can be inflated and deflated through a miniature pump system driven by a shape memory polymer, and the deformation of the petal 1 controls the inflation and deflation process of the air bag. During the day, the light drives the shape memory polymer to inflate the air bag, increases the buoyancy, and makes the petal 1 open and float to the water surface. At night, the light is weak, the shape memory polymer returns to its original state, the air bag deflates, and the buoyancy decreases, making the petal 1 close and sink. The bottom support 3 is designed at the bottom of the air bag 2 to support the petal 1 and the air bag 2;

[0031] The shape memory polymer is used to drive the gravity center adjustment, and the gravity center position is automatically adjusted according to the illumination condition. When the illumination is in the daytime, the gravity center adjustment device moves the gravity center to the bottom, increases the buoyancy, makes the petal 1 open and float to the water surface, and when the illumination is in the night, the gravity center adjustment device makes the gravity center evenly distributed, reduces the buoyancy, makes the petal 1 close and sink. The bottom support structure is a circular table type structure made of solid light acrylic material.

[0032] Embodiment:

[0033] 1. System assembly

[0034] The construction of the system model includes:

[0035] The light-driven device is composed of a plurality of petals 1 stacked in sequence from inside to outside to form a water lily structure. The petals 1 are made of shape memory polymer material, and the inner and outer surfaces of the petals 1 are coated with rare earth nano-particle paint.

[0036] The buoyancy adjustment device includes a plurality of air bag structures 2 and a bottom support 3. The root of each petal 1 is connected to the bottom support 3 through the air bag structure 2.

[0037] The specific assembly steps are as follows:

[0038] (1) Cutting and coating petals:

[0039] Cut the EVA / silver nanowire composite material into petal shape, and uniformly coat the rare earth nano-coating material on the surface of the cut petals to ensure uniform coverage and sufficient curing.

[0040] (2) Petal assembly:

[0041] Assemble the petals coated with rare earth nano-coating with the air bag device and the gravity center adjustment device to ensure that each petal can independently and smoothly open and close. Check whether each connection part is firm to ensure that the petals will not loosen or fall off under the driving of light (see Figure 2 、 3 ).

[0042] (3) Buoyancy adjustment device installation:

[0043] Install the air bag structure at the bottom of each petal, and ensure that the air bag can effectively adjust the buoyancy of the petal when inflated and deflated according to the design. Install the bottom support structure at the bottom of the device to ensure that it can automatically adjust the gravity center position under the conditions of illumination and no light, and assist the opening and closing and floating of the petals.

[0044] (4) System assembly:

[0045] Assemble the petals according to the design drawing (see Figure 1) Installation, ensuring that the petals can open and close normally under the support of the bottom. Confirm the angle and position of each petal on the support structure to ensure that it can work normally under the action of light-driven and buoyancy adjustment devices.

[0046] 2. Debugging of light-driven devices:

[0047] Test scene setting: simulate sewage treatment environment, including water pool and light source simulation equipment, debug the assembled light-driven device under light conditions. The specific steps include:

[0048] (1) Set the light source to simulate daytime light conditions, observe the opening and closing of the petals of the light-driven device, record the time from closing to fully opening, measure the temperature changes of the petal surface and EVA composite material, and ensure that the silver nanowire composite material can quickly absorb heat and drive the EVA material to deform.

[0049] (2) Confirm that the petals can gradually open and float to the water surface under light, optimize the opening speed and angle of the petals by adjusting the light intensity and illumination time.

[0050] (3) Turn off the light source to simulate night without light, observe the closing of the petals of the device, monitor the cooling process of the petals, record the time from opening to fully closing, measure the temperature changes of the petal surface and EVA composite material, and ensure that it can gradually close and sink underwater. Adjust the cooling rate of the EVA material to ensure smooth and stable closing process.

[0051] 3. Debugging of buoyancy adjustment device:

[0052] Under light and no light conditions, debug the inflation and exhaust system of the air bag. The specific steps include:

[0053] (1) Under light conditions, control the inflation amount of the air bag to ensure that the buoyancy of the petals is sufficient to float to the water surface. Observe the floating of the petals, record the inflation condition and buoyancy change of the buoyancy adjustment device after the petals open, adjust the inflation speed and amount of the air bag to ensure that the petals can float stably.

[0054] (2) Under no light conditions, control the exhaust amount of the air bag to ensure that the petals can gradually sink underwater. Observe the sinking process of the petals, record the exhaust condition and buoyancy change of the buoyancy adjustment device after the petals close, adjust the exhaust speed and amount of the air bag to ensure that the petals can sink smoothly.

[0055] 4. Installation of bacteria-algae symbiotic system:

[0056] Install the bacteria-algae symbiotic system underwater and install the light sensor to monitor the light energy transmission. The specific steps include:

[0057] (1) Determine the optimal installation location of the bacteria-algae symbiotic system to ensure it can fully receive the light energy transmitted by the light-driven device.

[0058] (2) Install light sensors to monitor the underwater light intensity (see attached Figure 4 ) and distribution in real time. Through data collection and analysis, ensure that the light energy transmission effect meets the expected value, and promote the photosynthesis of the bacteria-algae system.

[0059] (3) System debugging and optimization, according to the sensor data, adjust the working state of the light-driven device and the buoyancy adjustment device, ensure the overall operation efficiency and stability of the system.

[0060] 5. System test:

[0061] Test the efficiency of the shape memory polymer bionic lotus light-driven bacteria-algae wastewater treatment system in promoting photosynthesis, as well as the stability and durability of the system. The specific steps include:

[0062] (1) Select two bacteria-algae symbiotic systems under the same conditions, one as the control group (without adding bionic lotus device), and the other as the experimental group (adding bionic lotus device). Under the same light and temperature conditions, run two systems, and measure and record the amount of chlorophyll generated in the two groups.

[0063] (2) Collect water samples at regular intervals, use a spectrophotometer to measure the concentration of chlorophyll, and record the amount of chlorophyll generated. Analyze the chlorophyll generation data of the two groups, compare the influence and promotion effect of the bionic lotus device on photosynthesis (see attached Figure 5 ).

[0064] (3) Perform a 30-day continuous test to monitor the stability and durability of the system. Record the performance changes of the bionic lotus device in terms of light driving and buoyancy adjustment, and ensure the stability and reliability of the system in long-term operation.

[0065] The shape memory polymer (SMP) driven bionic lotus light-driven bacteria-algae wastewater treatment system combines the memory effect of SMP and bionic design, and drives the opening and closing of the petals through changes in environmental temperature, achieving dynamic regulation of light. Through precise light management, ensure that algae receive uniform and suitable light, promote the best symbiotic relationship between algae and bacteria, and improve the efficiency and stability of wastewater treatment. At the same time, bionic design reduces dependence on external energy, reduces system energy consumption, and is easy to maintain and manage, improving overall reliability and service life.

[0066] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the technical solution of the present application, can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes. However, as long as it does not deviate from the technical solution of the present application, and is within the spirit and principles of the present application, any simple modification, equivalent replacement and improvement of the above embodiments are still within the protection scope of the technical solution of the present application.

Claims

1. A shape memory polymer biomimic lotus light-driven bacterial-algal wastewater treatment system, characterized in that, The shape memory polymer biomimetic lotus flower light-driven bacteria-algae sewage treatment system comprises a plurality of petals (1), a plurality of air bag structures (2) and a bottom support (3); the plurality of petals (1) are sequentially stacked from inside to outside to form a lotus flower structure, and the roots of each petal (1) are connected with the bottom support (3) through the air bag structure (2); the inflation and deflation of the air bag structure (2) are controlled through the deformation of the petals (1); The petals (1) are made of a shape memory polymer material, and the inner and outer surfaces of the petals (1) are coated with a rare earth nanoparticle paint; the shape memory polymer material takes EVA as a shape memory polymer base material, silver nanowires are uniformly doped in the EVA matrix by using a polyol reduction mixed hot pressing method, the mixed silver nanowires and EVA particles are mixed, and the mixture is placed in a hot pressing mold to be hot pressed into an EVA / silver nanowire composite material (1-1) under a certain temperature and pressure. The rare earth nanoparticle paint selects a rare earth material cerium-doped yttrium aluminum garnet with high light absorption and emission capacity, and uses a chemical precipitation method to synthesize cerium-doped yttrium aluminum garnet rare earth nanoparticles; the synthesized rare earth nanoparticles are uniformly dispersed in a solution to prepare a sol suitable for coating, and are uniformly coated on the surface of the petals made of the EVA / silver nanowire composite material by a spraying method and are subjected to solidification treatment; Under the light condition in the daytime, the petals (1) absorb light energy and convert it into heat energy, the petals made of the EVA / silver nanowire composite material (1-1) deform, the air bag structure (2) inflates to increase the buoyancy, the plurality of petals (1) open and float to the water surface, and the rare earth nano coating (1-2) absorbs and stores light energy; under the lightless condition at night: the petals (1) release the stored light energy, the EVA / silver nanowire composite material (1-1) restores the deformation, the air bag structure (2) deflates to reduce the buoyancy, the petals (1) gradually close and sink underwater, and the rare earth nano coating (1-2) releases light energy which is guided out through a reflection layer to promote the photosynthesis of the underwater bacteria-algae system.

2. The shape memory polymer biomimic lotus light-driven bacterial-algal wastewater treatment system according to claim 1, characterized in that, The molding temperature is 120-150 DEG C, and the molding pressure is 1 MPa.

3. The shape memory polymer biomimic lotus light-driven bacteria-algae wastewater treatment system according to claim 1, characterized in that, The bottom support (3) is a circular truncated cone structure of solid lightweight acrylic material.

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