Bacteria-algae biological turntable and low-carbon high-efficiency wastewater treatment device

Abstract

The present application provides a kind of bacteria-algae biological turntable and low-carbon efficient wastewater treatment device, the bacteria-algae biological turntable includes: support disc body;Bacteria disc, the bacteria disc is set on the opposite two sides of the support disc body;Microalgae disc, the microalgae disc is set on the bacteria disc, to the bacteria disc is clamped between the microalgae disc and the support disc body.This bacteria-algae biological turntable contains bacteria disc and microalgae disc, while effectively removing pollutants, can effectively reduce the carbon emission of wastewater treatment industry, in addition, due to the oxygen production of microalgae, for aeration process also has certain optimization.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a bacterial and algal rotating disc and a low-carbon, high-efficiency wastewater treatment device. Background Technology

[0002] Biological rotating discs are a biofilm wastewater treatment technology pioneered in the 1950s and 60s, and are currently one of the most effective methods for treating wastewater. Traditional biological rotating discs mainly consist of discs, a contact reaction tank, a rotating shaft, and a drive unit. The discs are immersed or partially immersed in a contact reaction tank filled with wastewater. Driven by the drive unit, the shaft rotates the discs continuously at a certain linear speed, alternating between contact with wastewater and air. After a period of rotation, a biofilm adheres to the discs. When the discs are immersed in wastewater, they adsorb organic pollutants and absorb dissolved oxygen from the water film outside the biofilm, decomposing organic matter. Microorganisms use organic matter as nutrients for reproduction during this process. When the discs are evacuated from the wastewater, air continuously dissolves into the water film, increasing its dissolved oxygen content. The alternating contact between the biofilm and wastewater and air creates a continuous process of oxygen absorption, adsorption, and oxidative decomposition. While biological rotating disc devices effectively solve wastewater purification problems, they also create new environmental problems, namely, the large-scale emission of carbon dioxide.

[0003] With increasing carbon dioxide emissions, global temperatures have begun to rise, causing various environmental problems. Rising temperatures accelerate the melting and retreat of permafrost and glaciers, leading to significant changes in river flow and lake levels, and causing sea-level rise. All of these factors severely impact water resource supply and utilization. In today's "dual carbon" context, carbon emissions are receiving increasing attention, and achieving carbon reduction in water treatment systems while ensuring treatment effectiveness is of great practical significance. Furthermore, since the decomposition and nitrification of organic matter are aerobic reactions, traditional biological rotating discs require aeration while providing oxygen, which generates energy consumption and increases operating costs. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the main objective of this invention is to provide a bacterial and algal biological rotating disc and a low-carbon and high-efficiency wastewater treatment device. The bacterial and algal biological rotating disc includes a bacterial disc and a microalgae disc, which can effectively reduce carbon emissions in the wastewater treatment industry while efficiently removing pollutants. In addition, due to the oxygen production effect of microalgae, the aeration process is also optimized to a certain extent.

[0005] To achieve the above objectives, according to a first aspect of the present invention, a microbial rotating disc for bacteria and algae is provided.

[0006] This algal and bacterial rotating disk includes:

[0007] Support plate;

[0008] A bacterial tray, wherein the bacterial tray is disposed on opposite two sides of the support tray body;

[0009] A microalgae disc is disposed on the bacterial disc to sandwich the bacterial disc between the microalgae disc and the support disc.

[0010] Furthermore, the bacterial disc is a bacterial hydrogel membrane covering the support disc body.

[0011] Furthermore, the microalgae disc is a microalgae hydrogel membrane covering the bacterial disc.

[0012] Furthermore, both the bacterial hydrogel membrane and the microalgae hydrogel membrane are obtained using 3D bioprinting technology.

[0013] Furthermore, the support plate is provided with through holes penetrating its opposite sides for fixing the support plate onto the rotating shaft.

[0014] To achieve the above objectives, according to a second aspect of the present invention, a low-carbon and high-efficiency wastewater treatment device is provided.

[0015] This low-carbon, high-efficiency wastewater treatment device includes a reaction tank, a lighting system, and at least one of the aforementioned bacterial and algal biological rotating discs; wherein,

[0016] The bacterial and algal biological rotating disk is placed inside the reaction tank and rotates relative to the reaction tank;

[0017] The lighting system is partially placed inside the reaction tank and positioned near the upper half of the algae and bacteria rotating disk, so that the upper and lower halves of the algae and bacteria rotating disk are exposed to different light intensities during rotation.

[0018] Furthermore, multiple bacterial and algal biological rotating discs are provided, and the multiple bacterial and algal biological rotating discs are connected by rotating shafts.

[0019] Furthermore, there is a gap between two adjacent bacterial and algal biological rotating disks.

[0020] Furthermore, the lighting system includes:

[0021] A concentrator is used to collect sunlight.

[0022] The illumination device includes a first optical fiber and a second optical fiber connected together. The first optical fiber is connected to the focusing device, and the second optical fiber extends into the interior of the reaction tank and is positioned near the upper part of the microalgae biological rotating disk to provide illumination for microalgae photosynthesis.

[0023] Furthermore, the lighting system also includes a solar power generation system to provide energy and lighting for the nighttime operation of the wastewater treatment device.

[0024] Advantages of this invention:

[0025] 1. The microalgae disc can remove pollutants while fixing carbon dioxide, thus achieving carbon emission reduction.

[0026] 2. The microalgae disc removes pollutants while generating oxygen, reducing aeration and energy consumption.

[0027] 3. The microalgae in the microalgae tray can be recycled after treatment, which has certain economic benefits.

[0028] 4. The interaction between bacteria and algae in the bacterial-algae biological rotating disc shows that the bacterial-algae system has a higher tolerance and removal capacity for pollutants compared to individual bacterial or algae systems. This symbiotic relationship can be used to efficiently treat wastewater, especially wastewater containing high levels of nitrogen and phosphorus, heavy metals, and antibiotics, which has certain advantages. Attached Figure Description

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0030] Figure 1 A schematic diagram of the structure of the low-carbon and high-efficiency wastewater treatment device provided in the embodiments of the present invention;

[0031] Figure 2 A longitudinal cross-sectional view of multiple algal and bacterial rotating disks used in conjunction with a lighting system in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the composition and structure of the illumination system in an embodiment of the present invention.

[0033] In the picture:

[0034] 1. Algal and bacterial rotating disc; 101. Support disc; 102. Bacterial disc; 103. Microalgae disc;

[0035] 2. Rotating shaft; 3. Reaction tank; 4. Concentrating device; 5. Illumination device; 501. First optical fiber; 502. Second optical fiber; 6. Solar power generation system. Detailed Implementation

[0036] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0037] The common working mechanism of biological rotating disc filters is as follows: Wastewater flows on the surface of the disc, and after a period of time, a thin biofilm forms. A large number of microorganisms proliferate on this biofilm, adsorbing and degrading organic pollutants in the water, breaking them down into harmless substances such as carbon dioxide and water. Due to the large-scale growth and reproduction of microorganisms on the filter media, the biofilm thickness increases, preventing oxygen from fully penetrating the biofilm. Therefore, both anaerobic and aerobic reactions occur within the biofilm. This allows the biological rotating disc to remove nitrogen (ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen) from the wastewater through nitrification (aerobic reaction) and denitrification (anaerobic reaction). However, carbon dioxide is a product of denitrification, and the decomposition of organic pollutants by the biofilm also produces a large amount of carbon dioxide, which clearly contradicts the "carbon reduction" requirement in the overall energy conservation and emission reduction plan.

[0038] Therefore, this invention introduces microalgae into wastewater treatment systems to reduce carbon emissions, providing a novel biological rotating disc and wastewater treatment device.

[0039] The present invention introduces microalgae into the microbial rotating disc to construct a microbial symbiotic system. First, the microalgae themselves can remove nitrogen and phosphorus; second, in this process, the microalgae can also fix carbon dioxide, achieving carbon emission reduction; in addition, the microalgae can also produce oxygen needed for the decomposition and nitrification of organic pollutants, reducing aeration and lowering energy consumption.

[0040] Figure 1 A schematic diagram of the structure of a low-carbon and high-efficiency wastewater treatment device in an embodiment of the present invention is shown.

[0041] Figure 2 The diagram shows a longitudinal cross-sectional view of multiple bacterial and algal biological rotating disks used in conjunction with a lighting system in an embodiment of the present invention.

[0042] like Figures 1-2 As shown, the bacterial and algal biological rotating disk 1 includes a support disk 101, a bacterial disk 102, and a microalgae disk 103; wherein, the bacterial disk 102 is disposed on opposite sides of the support disk 101; the microalgae disk 103 is disposed on the bacterial disk 102, so that the bacterial disk 102 is sandwiched between the microalgae disk 103 and the support disk 101.

[0043] In embodiments of the present invention, the bacterial-algae biological rotating disc 1 includes both a bacterial disc 102 and a microalgae disc 103. Utilizing the symbiotic relationship between bacteria and algae, it can efficiently treat wastewater, especially suitable for treating wastewater containing high levels of nitrogen and phosphorus, heavy metals, and antibiotics. Furthermore, the microalgae disc 103 fixes carbon dioxide while removing pollutants, achieving carbon emission reduction and lower energy consumption. Moreover, the bacterial disc 102 and the microalgae disc 103 are spatially separated, which facilitates providing stable light for microalgae photosynthesis and also makes the recycling of microalgae easier.

[0044] In one embodiment of the present invention, the bacterial tray 102 is a bacterial hydrogel film covering the support tray 101.

[0045] In one embodiment of the present invention, the bacterial disc 102 can be connected to the support disc 101 by means of mechanical anchoring. For example, protrusions or grooves can be designed on the edge or surface of the support disc 101 to achieve the interlocking and connection between the bacterial disc 102 and the support disc 101.

[0046] In one embodiment of the present invention, the microalgae disc 103 is a microalgae hydrogel membrane covering the bacterial disc 102.

[0047] In one embodiment of the present invention, the microalgae disc 103 can also be connected to the support disc 101 together with the bacterial disc 102 by means of mechanical anchoring.

[0048] Of course, the microalgae disc 103 can also be connected to the bacterial disc 102 by mechanical anchoring. For example, protrusions or grooves can be designed on the edge or surface of the bacterial disc 102 to achieve interlocking and connection between the microalgae disc 103 and the bacterial disc 102.

[0049] It should be noted that the connection and fixing methods between the support plate 101, the bacterial plate 102 and the microalgae plate 103 can be designed in various styles according to actual needs, without specific limitations.

[0050] Given that the biofilm on the existing biological rotating disc is naturally grown, microorganisms grow and multiply in large numbers on the filter media, resulting in an increase in the thickness of the biofilm. Oxygen cannot completely penetrate into the interior of the biofilm, thus generating both anaerobic and aerobic reaction types in the biofilm, which in turn produces a large amount of carbon dioxide.

[0051] The bacterial hydrogel membrane and microalgae hydrogel membrane in this invention are both artificially constructed using bioprinting technology. The purpose of this is to spatially separate the bacterial hydrogel membrane and the microalgae hydrogel membrane, which on the one hand makes it easier to provide stable light for the photosynthesis of microalgae, and on the other hand makes it easier to recycle microalgae. Since microalgae are rich in single-cell proteins, oils, unsaturated fatty acids, natural pigments, vitamins and minerals, they are a very good feed and biofuel raw material with high recycling value.

[0052] In one embodiment of the present invention, the bacterial hydrogel membrane is obtained by 3D bioprinting technology.

[0053] The printing ink is made from natural alginate and fibrous protein, and the 3D bioprinting technology used is extrusion 3D bioprinting technology.

[0054] In one embodiment of the present invention, the microalgae hydrogel membrane is obtained by 3D bioprinting technology.

[0055] The printing ink is made from natural polysaccharides with hydrogel properties and coupled with natural fibrous proteins. The 3D bioprinting technology used is extrusion 3D bioprinting technology.

[0056] In embodiments of the present invention, the natural polysaccharides include, but are not limited to, alginate, at a concentration of 1–1.5%.

[0057] In embodiments of the present invention, the coupling of natural fibrous proteins includes, but is not limited to, silk fibroin and animal keratin, at a concentration of 5-15%.

[0058] In an embodiment of the present invention, the support plate 101 is provided with through holes (not marked) penetrating its opposite sides, for fixing the support plate 101 to the rotating shaft 2.

[0059] It is worth mentioning that the purpose of providing through holes on the support plate 101 is to fix the support plate 101 onto the rotating shaft 2, so that the support plate 101 can rotate together with the rotating shaft 2. Therefore, in the embodiments of the present invention, grooves can also be provided on opposite sides of the support plate 101, and the rotating shaft 2 is connected to the grooves to enable the support plate 101 to rotate together with the rotating shaft 2. Therefore, there can be various specific connection methods between the support plate 101 and the rotating shaft 2, and no specific limitation is made.

[0060] It is worth mentioning that the support plate 101 in this invention can be a solid structure plate, a hollow structure plate, or a disc-shaped support frame, with the aim of effectively supporting the bacterial plate 102 and the microalgae plate 103. Therefore, the specific design structure of the support plate 101 is not specifically limited.

[0061] According to a specific embodiment of the present invention, a low-carbon and high-efficiency wastewater treatment device is also provided.

[0062] like Figure 1 and Figure 3 As shown, this low-carbon, high-efficiency wastewater treatment device includes a reaction tank 3, a lighting system, and at least one of the aforementioned bacterial and algal biological rotating discs 1; wherein,

[0063] The bacterial and algal biological rotating disc 1 is placed in the reaction tank 3 and rotates relative to the reaction tank 3, so that in actual application, the bacterial and algal biological rotating disc 1 is completely submerged in the wastewater in the reaction tank 3.

[0064] The lighting system is placed inside the reaction tank 3, and is positioned close to the upper part of the algae and bacteria rotating disk 1, so that the upper and lower parts of the algae and bacteria rotating disk 1 are in different light intensity environments during rotation.

[0065] Compared to the rotation of traditional biological rotating discs, which is for mixing and aeration of gas, liquid, and solid, the rotation of the bacterial and algal biological rotating disc 1 in this invention is for utilizing the flash effect of microalgae to improve the efficiency of pollutant removal.

[0066] The flash effect refers to the fact that, under the same light intensity, the light efficiency of microalgae cultivation under alternating light and dark conditions is higher than that under continuous light conditions. Since the lighting system in this invention is positioned close to the upper part of the algal-bacterial rotating disk 1, the microalgae are in an environment of alternating light and dark as the disk rotates, enabling them to efficiently remove pollutants.

[0067] It is worth mentioning that microalgae differ from most bacteria in that they are autotrophic organisms. Microalgae need to perform photosynthesis to function, so they require light.

[0068] In this invention, a lighting system is used to provide light for the photosynthesis of microalgae. This lighting system abandons the common mode of using LED lights to provide light and instead chooses to use sunlight, an inexhaustible and environmentally friendly resource.

[0069] In an embodiment of the present invention, the lighting system includes a concentrating device 4, the purpose of which is to collect sunlight.

[0070] As one embodiment of the present invention, the concentrating device 4 may include a Fresnel lens, a solar tracker, and a photovoltaic cell.

[0071] The function of a Fresnel lens is to focus sunlight from a relatively large area onto a relatively small area of ​​optical fiber, thus achieving a true light-concentrating effect.

[0072] The solar tracker is used to ensure that the concentrator 4 can actively follow the sunlight.

[0073] Photovoltaic cells are used to power solar trackers.

[0074] In an embodiment of the present invention, the lighting system further includes a lighting device 5, the purpose of which is to transmit the sunlight collected by the concentrator 4 to the interior of the reaction tank 3 to provide illumination for microalgae photosynthesis.

[0075] In one embodiment of the present invention, the illumination device 5 includes a first optical fiber 501 and a second optical fiber 502 connected together. The first optical fiber 501 is connected to the focusing device 4, and the second optical fiber 502 extends into the interior of the reaction tank 3 and is set near the upper part of the bacterial and algal biological rotating disk 1 to provide illumination for microalgae photosynthesis.

[0076] In order to reduce the attenuation of sunlight during transmission, the first optical fiber 501 can be an end-face light-emitting fiber, specifically an end-face light-emitting fiber, as a means of transmitting sunlight; the second optical fiber 502 can be a side-light-emitting fiber, extending into the interior of the reaction pool 3 to provide light for microalgae.

[0077] It is worth mentioning that in practical use, factors such as the arrangement of optical fibers, light attenuation, and the size of Fresnel lenses can be comprehensively considered to provide suitable light intensity for microalgae.

[0078] In an embodiment of the present invention, the lighting system further includes a solar power generation system 6, which provides energy and lighting for the nighttime operation of the wastewater treatment device.

[0079] To ensure the wastewater treatment device can still operate normally at night when there is no sunlight, a solar power generation system 6 is installed. This solar power generation system 6 may include a solar power generator and LED lights that work in conjunction with it. The LED lights provide illumination, which is then transmitted via fiber optic cables to ensure the wastewater treatment device can operate normally even at night.

[0080] Continue to refer to Figure 2 As shown, there are multiple bacterial and algal biological rotating disks 1, which are connected by rotating shafts 2, so that multiple bacterial and algal biological rotating disks 1 can be used together.

[0081] In an embodiment of the present invention, there is a gap between two adjacent bacterial and algal biological rotating disks 1 to ensure that each bacterial and algal biological rotating disk 1 can function effectively.

[0082] In the embodiments of the present invention, the purpose of setting the spacing is to provide a suitable light intensity to the algae and bacteria rotating disk 1. However, the light intensity that the algae and bacteria rotating disk 1 can receive is not only related to the spacing, but also closely related to the light intensity that the actual lighting system can provide. Therefore, the size of the spacing needs to be determined according to the specific circumstances in actual operation.

[0083] It should be noted that the number of algae and bacteria biological rotating disks 1, as well as the specific locations and connections between multiple algae and bacteria biological rotating disks 1, can be adjusted according to actual needs and are not specifically limited.

[0084] In the embodiments of the present invention, the reaction tank 3 can be a conventional cuboid tank, and the specific structure of the reaction tank 3 is not specifically limited.

[0085] It should be noted that the term "comprising" and any variations thereof in the specification and claims of this invention are intended to cover non-exclusive inclusion, for example, including a series of components that are not necessarily limited to those explicitly listed, but may include other components that are not explicitly listed or that are inherent to the component.

[0086] In this invention, the terms "upper," "lower," "bottom," "top," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0087] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0088] Furthermore, the descriptions of "first," "second," etc., involved in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0089] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0090] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A low-carbon high-efficiency wastewater treatment device, characterized in that, The wastewater treatment device comprises a reaction tank, a light system and at least one bacteria-algae biological turntable; the bacteria-algae biological turntable is arranged in the reaction tank and rotates relative to the reaction tank so as to be totally immersed in the wastewater in the reaction tank; the light system is partially arranged in the reaction tank and is arranged close to the upper half of the bacteria-algae biological turntable so that the upper half and the lower half of the bacteria-algae biological turntable are in different light intensity environments during rotation. The light system comprises: a light collecting device for collecting sunlight; a light device comprising a first optical fiber and a second optical fiber connected to each other, the first optical fiber being connected to the light collecting device, and the second optical fiber extending into the inside of the reaction tank and being arranged close to the upper half of the bacteria-algae biological turntable to provide light for the photosynthesis of microalgae; the first optical fiber is a light-emitting optical fiber at both ends, and the second optical fiber is a light-emitting optical fiber at the side; a solar power generation system for providing energy and light for the night operation of the wastewater treatment device; The bacteria-algae biological turntable comprises: a support disc body; bacteria discs arranged on opposite sides of the support disc body, the bacteria discs being connected by engaging with the protrusions or notches designed on the edges or surfaces of the support disc body; the bacteria discs are bacterial hydrogel films covering the support disc body; microalgae discs arranged on the bacteria discs to sandwich the bacteria discs between the microalgae discs and the support disc body, the microalgae discs being connected by engaging with the protrusions or notches designed on the edges or surfaces of the bacteria discs; the microalgae discs are microalgae hydrogel films covering the bacteria discs; The bacterial hydrogel films and the microalgae hydrogel films are obtained by 3D bioprinting technology.

2. The low-carbon high-efficiency wastewater treatment device according to claim 1, characterized in that, The support disc body is provided with through holes penetrating through opposite sides thereof for fixing the support disc body on a rotating shaft.

3. The low-carbon high-efficiency wastewater treatment device according to claim 1, characterized in that, A plurality of bacteria-algae biological turntables are arranged, and the bacteria-algae biological turntables are connected by rotating shafts.

4. The low-carbon high-efficiency wastewater treatment device according to claim 3, characterized in that, There is a spacing between adjacent two bacteria-algae biological turntables.

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