Organic wastewater treatment device coupling photocatalysis and microalgae carbon sequestration

Abstract

The invention discloses an organic wastewater treatment device coupling photocatalysis and microalgae carbon sequestration. The organic wastewater treatment device comprises a photocatalytic degradation device, a microalgae carbon sequestration device and a light guide nuclear pore filter membrane, the front end of the photocatalytic degradation device is provided with a water inlet, and the tail end is provided with a water outlet of which the pipe diameter is smaller than that of the water inlet; the light guide nuclear pore filter membrane is mounted at the top of the photocatalytic degradation device above the baffle plate; a feeding hole is formed in the top of the microalgae carbon sequestration device; a detachable visible light emitting plate is arranged in the microalgae carbon sequestration device. According to the method, electricity is generated in the photocatalytic degradation process, waste recycling is achieved, and generated carbon dioxide provides a carbon source for carbon sequestration microalgae. The microalgae absorb carbon dioxide generated by photocatalysis through photosynthesis. The microalgae cells are converted into energy substances such as biodiesel while realizing emission reduction, so that the effects of saving energy, reducing emission and improving the water treatment efficiency are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to an organic wastewater treatment device coupling photocatalysis and microalgae carbon fixation. Background Art

[0002] With the growth of population, social and economic development and changes in consumption patterns, water pollution caused by industry, agriculture or other human activities is becoming more and more serious, and the discharge of organic wastewater will lead to further deterioration of the environment, so it is of great significance to treat organic wastewater through effective methods for human living environment. At present, the treatment technologies of organic wastewater mainly include physicochemical method, chemical method and biochemical method. Physicochemical method mainly includes adsorption method, extraction method and membrane decomposition method, but this kind of method only transfers the pollutants in organic wastewater, and does not fundamentally achieve the purpose of degrading pollutants, and there are problems of low treatment efficiency and high cost consumption. Chemical method mainly includes chemical flocculation and chemical oxidation, but this kind of method requires further treatment of the precipitated sludge produced, and improper use of flocculants will also cause certain pollution to the environment; while biological treatment method can reduce COD, remove nitrogen and phosphorus, filter SS, etc. by using biological filter tank, but the treatment efficiency of difficult-to-degrade organic matter is low.

[0003] Therefore, the present invention proposes to use a green and environmentally friendly cleaning technology, namely, photocatalytic oxidation, in the process of treating organic wastewater. A sufficient amount of catalyst is added to the water sample. Under the irradiation of LED lamps, the photocatalyst generates photogenerated holes and photogenerated electrons, which then react with water to generate hydroxyl radicals (·OH) with strong oxidizing properties. The super strong oxidizing ability is utilized to decompose the difficult-to-degrade organic pollutants and treat the wastewater, thereby achieving the effect of removing pollutants. At the same time, the technology can oxidize all reducing substances within a specified time, thereby minimizing the possibility of re-pollution. However, the technology faces the problems of low catalytic efficiency of the photocatalyst, low utilization rate of light energy, and secondary pollution caused by direct addition of the photocatalyst as a nanomaterial. The present device intends to use LED lamps as light sources, and optical fibers as light transmission channels and fixed carriers of the photocatalysts, thereby solving the problem of photocatalyst recovery.

[0004] However, photocatalytic oxidation of organic pollutants will produce carbon dioxide, which does not meet the requirements of carbon emission reduction. Microalgae can absorb the carbon dioxide produced by photocatalysis through its photosynthesis. Microalgae cells contain a lot of oil, which can be recycled and extracted to produce products such as biodiesel. Therefore, the present invention provides a device design that couples photocatalysis with microalgae carbon fixation, which can solve the problem of carbon emissions from photocatalytic reactions while degrading organic pollutants. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the organic wastewater treatment method has poor effect, high cost, easily produces toxic and harmful by-products, and pollutes the microalgae carbon fixation system.

[0006] To achieve the above-mentioned purpose, the present invention provides an organic wastewater treatment device that couples photocatalysis and microalgae carbon fixation, including a photocatalytic degradation device 1, a microalgae carbon fixation device 2, and a light-guiding nuclear pore filter membrane 3; a photocatalytic reactor is installed inside the photocatalytic degradation device 1; a water inlet 6 is provided at the front end of the photocatalytic degradation device, and a water outlet 8 with a pipe diameter smaller than the water inlet is provided at the end. The light-guiding nuclear pore filter membrane 3 is installed on the top of the photocatalytic degradation device 1 above the baffle 4. A feed port 12 is provided on the top of the microalgae carbon fixation device; a detachable visible light luminous plate 11 is provided inside the microalgae carbon fixation device 2, and a drain port 9 with an additional three-stage replaceable filter membrane is also provided at the end.

[0007] The photocatalytic reactor comprises an optical fiber 5 on the surface of which a photocatalyst is attached by a coating process and an external LED light source; an optical fiber replacement base plate 10 is arranged at the lower end of the optical fiber.

[0008] An aeration plate 7 is arranged at the lower end of the photocatalytic degradation device.

[0009] A baffle 4 is provided at the upper end of the photocatalytic treatment part.

[0010] The upper end of the light-guiding nucleus pore filter membrane 3 is connected to the microalgae carbon fixation device 2 .

[0011] The top feeding port 12 of the microalgae carbon fixation device 2 provides a controllable microalgae cultivation environment.

[0012] The internal and external pressure difference caused by the difference in inlet and outlet flow is utilized to cause the wastewater to accumulate and surge in front of the water outlet inside the device, and enter the microalgae carbon fixation device 2 through the light-guiding nuclear pore filter membrane 3, thereby providing an environment and raw materials for the operation of the microalgae carbon fixation device 2.

[0013] The degradation product CO2 passes through the light-guiding nucleus pore filter membrane 3 and enters the microalgae carbon fixation device 2 to provide a carbon source for the microalgae carbon fixation device 2.

[0014] The algae utilizes light energy to photosynthesize and absorb the degradation product CO2, generating oxygen that enters the photocatalytic degradation device 1 to promote the photocatalytic reaction. After the reaction, the wastewater is discharged through the drain port 9 with a cleanable and replaceable three-stage filter membrane.

[0015] Harvesting and extracting microalgae to produce biodiesel and other high value-added products.

[0016] In a preferred embodiment of the present invention, organic wastewater enters the device from the water inlet 6 of the photocatalytic degradation device 1, the LED light source is turned on, the light is transmitted inside the optical fiber 5, and finally the light is transmitted along the optical fiber 5 to the end of the optical fiber (end-face luminous optical fiber) or leaks from the side of the optical fiber (side-luminous optical fiber), and the lower aeration plate 7 is opened to improve the efficiency of the photocatalytic reaction and provide the microalgae carbon fixation part with oxygen required for growth and reproduction. The water inlet 6 is connected to a biochemical pool containing penicillin medical wastewater with a flow rate of 0.8 m / s and a temperature of 30°C. The hydraulic retention time is 21.7s, and 10L of medical wastewater is continuously sampled, and CO2 bubbles are generated during the reaction.

[0017] In a preferred embodiment of the present invention, the medical wastewater utilizes the internal and external pressure difference caused by the difference in inlet and outlet flow rates to cause the medical wastewater to accumulate and surge in front of the water outlet inside the device, and enter the microalgae carbon fixation device 2 through the light-guiding nuclear pore filter membrane 3, providing an environment and raw materials for the operation of the microalgae carbon fixation device 2. The degradation product CO2 enters the microalgae carbon fixation device 2 through the light-guiding nuclear pore filter membrane 3, providing a carbon source for the microalgae carbon fixation device 2.

[0018] In a preferred embodiment of the present invention, the top feed port 12 of the microalgae carbon fixation device 2 is used to provide a controllable microalgae cultivation environment. The algae utilizes light energy to photosynthesize and absorb the degradation product CO2, generating oxygen that enters the photocatalytic degradation device 1 to promote the photocatalytic reaction. After the reaction, the wastewater is discharged through the drain port 9 with a cleanable and replaceable three-stage filter membrane. Furthermore, the microalgae can be harvested and extracted to produce biodiesel and other high value-added products.

[0019] The device design of the present invention couples photocatalysis with microalgae carbon fixation, which not only degrades organic pollutants but also solves the carbon emission problem of photocatalytic reaction. At the same time, microalgae can absorb carbon dioxide produced by photocatalysis through its photosynthesis. The microalgae cells contain a lot of oil, which can be recycled and extracted to produce products such as biodiesel.

[0020] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of an organic wastewater treatment device that couples photocatalysis and microalgae carbon fixation according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following describes several preferred embodiments of the present invention with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0023] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0024] like Figure 1 As shown, an organic wastewater treatment device that couples photocatalysis and microalgae carbon fixation includes a photocatalytic degradation device 1, a microalgae carbon fixation device 2, and a light-guiding nuclear pore filter membrane 3.

[0025] A photocatalytic reactor is installed inside the photocatalytic degradation device 1. The photocatalytic reactor includes an optical fiber 5 with a photocatalyst attached to the surface by a coating process and an external LED light source. An optical fiber replacement base plate 10 is arranged at the lower end of the optical fiber.

[0026] The front end of the photocatalytic degradation device is provided with a water inlet 6, and the end is provided with a water outlet 8 with a pipe diameter significantly smaller than the water inlet. The lower end of the photocatalytic degradation device is provided with an aeration plate 7. The upper end of the photocatalytic treatment part is provided with a baffle 4 of a certain length.

[0027] The light-guiding nucleus pore filter membrane 3 is installed on the top of the photocatalytic degradation device 1 above the baffle 4. The upper end of the light-guiding nucleus pore filter membrane 3 is connected to the microalgae carbon fixation device 2.

[0028] The top of the microalgae carbon fixation device is provided with a feed port 12. The microalgae carbon fixation device 2 is provided with a detachable visible light emitting plate 11 inside, and a drain port 9 with a three-stage replaceable filter membrane is also provided at the end of the part.

[0029] During operation, organic wastewater enters the device from the water inlet 6 of the photocatalytic degradation device 1, the LED light source is turned on, and the light is transmitted inside the optical fiber 5. Finally, the light is transmitted along the optical fiber 5 to the end of the optical fiber (end-face luminous optical fiber) or leaked from the side of the optical fiber (side-luminous optical fiber), and the lower aeration plate 7 is turned on to improve the efficiency of the photocatalytic reaction, while providing the microalgae carbon fixation part with oxygen required for growth and reproduction. The water inlet 6 is connected to a biochemical pool containing penicillin medical wastewater with a flow rate of 0.8m / s and a temperature of 30°C. The hydraulic retention time is 21.7s, and 10L of medical wastewater is continuously sampled, and CO2 bubbles are generated during the reaction.

[0030] The medical wastewater utilizes the internal and external pressure difference caused by the difference in inlet and outlet flow rates to cause the medical wastewater to accumulate and surge in front of the water outlet inside the device, and enter the microalgae carbon fixation device 2 through the light-guiding nuclear pore filter membrane 3, providing an environment and raw materials for the operation of the microalgae carbon fixation device 2. The degradation product CO2 enters the microalgae carbon fixation device 2 through the light-guiding nuclear pore filter membrane 3, providing a carbon source for the microalgae carbon fixation device 2.

[0031] The top feed port 12 of the microalgae carbon fixation device 2 is used to provide a controllable microalgae cultivation environment. The algae utilizes light energy to photosynthesize and absorb the degradation product CO2, generating oxygen that enters the photocatalytic degradation device 1 to promote the photocatalytic reaction. After the reaction, the wastewater is discharged through the drain port 9 with a cleanable and replaceable three-stage filter membrane. Furthermore, the microalgae can be harvested and extracted to produce biodiesel and other high value-added products.

[0032] This embodiment discloses an organic wastewater treatment device that couples photocatalysis and microalgae carbon fixation. Through experiments, under the conditions of a flow rate of 0.8 m / s, a water temperature of 30°C, and a continuous injection of 10 L, the COD removal rate can reach 90%, 0.02 kWh of electricity is generated, and 11.57 g of microalgae is consumed.

[0033] The preferred specific embodiments of the present invention are described in detail above. It should be understood that ordinary technicians in the field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by technicians in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An organic wastewater treatment device coupling photocatalysis and microalgae carbon fixation, characterized in that: It comprises a photocatalytic degradation device, a microalgae carbon fixation device and a light-guiding nuclear pore filter membrane; a photocatalytic reactor is installed inside the photocatalytic degradation device; a water inlet is provided at the front end of the photocatalytic degradation device, and a water outlet with a smaller diameter than the water inlet is provided at the end; the light-guiding nuclear pore filter membrane is installed at the top of the photocatalytic degradation device above the baffle; a feeding port is provided at the top of the microalgae carbon fixation device; a detachable visible light luminous plate is provided inside the microalgae carbon fixation device, and a drainage outlet with an additional three-stage replaceable filter membrane is also provided at the end.

2. The device according to claim 1, characterized in that The photocatalytic reactor comprises an optical fiber with a photocatalyst attached to the surface by a coating process and an external LED light source; an optical fiber replacement bottom plate is arranged at the lower end of the optical fiber.

3. The device according to claim 2, characterized in that An aeration plate is arranged at the lower end of the photocatalytic degradation device.

4. The device according to claim 3, characterized in that A baffle is provided at the upper end of the photocatalytic treatment part.

5. The device according to claim 1, characterized in that The upper end of the light-guiding nucleus pore filter is connected to a microalgae carbon fixation device.

6. The device according to claim 1, characterized in that The top feeding port of the microalgae carbon fixation device provides a controllable microalgae cultivation environment.

7. The device according to claim 1, characterized in that in, By utilizing the internal and external pressure difference caused by the difference in inlet and outlet flow, the wastewater is accumulated and upwelled in front of the water outlet inside the device, and enters the microalgae carbon fixation device through the light-guiding nuclear pore filter membrane, providing environment and raw materials for the operation of the microalgae carbon fixation device.

8. The device according to claim 7, characterized in that Algae use light energy to carry out photosynthesis to absorb the degradation product CO2, produce oxygen which enters the photocatalytic degradation device and promotes the photocatalytic reaction; after the reaction, the wastewater is discharged through a drain outlet with a cleanable and replaceable three-stage filter membrane.

9. The device according to claim 8, characterized in that The degradation product CO2 enters the microalgae carbon fixation device through the light-guiding nuclear pore filter membrane, providing a carbon source for the microalgae carbon fixation device.

10. The device according to claim 9, characterized in that Harvesting and extracting microalgae to produce biodiesel and other high value-added products.

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