Continuous flow photocatalysis-biological coupling reactor enhanced wastewater treatment device and application thereof

Abstract

The invention discloses a continuous flow photocatalysis-biological coupling reactor enhanced wastewater treatment device and application thereof. The continuous flow photocatalysis-biological coupling reactor enhanced wastewater treatment device mainly comprises a reactor, the reactor comprises a quartz tube, an LED lamp strip and a reaction type carrier; the LED lamp strip is wound on the outer wall of the quartz tube; the reaction type carrier is arranged in an inner cavity of the quartz tube; the reaction type carrier consists of a photocatalytic material, a carrier and a biological membrane; the carrier is hollow, the photocatalytic material is arranged on the outer side of the carrier, and the biological membrane is arranged on the inner side of the carrier. The water inlet device pumps wastewater into the reactor through a water inlet pump; meanwhile, the LED lamp strip is started to promote the reaction of the wastewater in the reactor, the sampling port monitors the wastewater treatment condition, when the wastewater treatment does not meet the discharge standard, the wastewater is returned to the reactor through the circulating pump to be circularly treated, and when the wastewater treatment meets the discharge standard, the wastewater is discharged through the water outlet device. The reactor disclosed by the invention is suitable for advanced treatment of different types of wastewater, and the efficiency of photocatalysis and denitrification processes is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater deep treatment in environmental engineering, and in particular to a continuous flow photocatalytic-biological coupling reactor enhanced wastewater treatment device and application thereof. Background Art

[0002] With the development of modernization, emerging pollutants are widely used in various activities due to their excellent physical and chemical properties, resulting in an increasing amount of their accumulation in wastewater. These emerging pollutants enter sewage treatment plants through industrial wastewater, medical wastewater and domestic wastewater. However, the treatment equipment of conventional sewage treatment plants is mainly aimed at traditional pollutants, resulting in the inability to completely degrade emerging pollutants. In addition, emerging pollutants in sewage may form complexes with other traditional pollutants or have more toxic derivatives under the action of physical, chemical and biological factors. When the treatment unit is in long-term operation, the concentration of emerging pollutants in water may be higher than that of the influent, resulting in a decrease in the removal efficiency of the sewage treatment plant or even a negative one. Emerging pollutants themselves have the characteristics of stability, bioaccumulation and ecotoxicity, which pose a serious threat to human life and health. At present, deep removal technologies for emerging pollutants include biological, physical and chemical methods.

[0003] Among them, biological method is one of the common means to remove emerging pollutants. Its principle is to use the metabolism of microorganisms to convert large molecular emerging pollutants into small molecular substances or even completely mineralize them, and finally achieve the removal effect. Biological method has the advantages of low cost, simple operation and mild operating conditions. However, the toxicity of emerging pollutants leads to low degradation rate of biological method and poor conversion and removal efficiency. In the process of removing emerging pollutants from water environment by physical method, the pollutants in liquid phase are mainly transferred to solid phase to reduce the concentration of pollutants in liquid phase. Compared with biological method, physical method has the advantages of short reaction time, good removal effect and no intermediate products. However, this technology has problems such as secondary pollution of pollutants and difficulty in handling and disposing of concentrated products. Chemical method can also be used for the degradation of emerging pollutants. The most commonly used methods are ozone oxidation, hydrogen peroxide oxidation, electrochemical method and photocatalytic method. These methods also have problems such as high cost, heavy secondary pollution and poor operation convenience. Therefore, efficient, green and low-cost degradation of emerging pollutants in secondary effluent is imminent.

[0004] In addition, with the gradual improvement of water environment standards, the country's conventional indicators for sewage discharge are becoming increasingly stringent. For example, cities along the Taihu Lake have begun to adopt quasi-Class IV requirements for sewage discharge, and the main control is the nitrogen index. Therefore, deep reduction of nitrogen content in secondary effluent at low cost and high efficiency is also a key point of ecological environmental protection.

[0005] Based on the above analysis, it is urgent to develop a technology that can simultaneously remove emerging pollutants and nitrate nitrogen from the secondary effluent of sewage treatment plants, while taking into account investment and operating costs, environmental protection and stability. The photocatalytic-biological coupling process is an effective technology for pollutant removal using photocatalytic treatment technology and microbial treatment technology, but the related technologies that have been made public face many problems, such as 1) the photogenerated electrons and holes generated in the photocatalytic process are easy to recombine, reducing the efficiency of light utilization; 2) the free radicals generated in the photocatalytic process will poison or even kill the functional microorganisms in the biofilm; 3) denitrifying microorganisms need to add exogenous electrons, resulting in high operating costs; 4) modular design is not adopted, and different water quality sources and operating conditions cannot be flexibly adjusted, and the practicality, economy and convenience are poor. The above problems restrict the promotion and application of the photocatalytic-biological coupling process. Summary of the invention

[0006] In view of the above problems existing in the prior art, the present invention provides a continuous flow photocatalytic-biological coupling reactor enhanced wastewater treatment device and its application. The present invention uses a conductive material as a carrier, improves the adjustment of the electronic structure of the photocatalyst and increases the efficiency of photoelectron transfer, constructs a carrier form in which the photocatalytic interface and the biodegradation interface are separated, and avoids the influence of free radicals generated in the photocatalytic process on microorganisms; at the same time, the photoelectrons generated in the photocatalytic process can be transferred to autotrophic denitrifying microorganisms through the conductive material, and the emerging pollutants and nitrate nitrogen can be removed simultaneously at low cost and high efficiency; a modular design is adopted to achieve flexible series / parallel assembly for different operating conditions, and it has good practicality.

[0007] The technical solution of the present invention is as follows:

[0008] The first object of the present invention is to provide a continuous flow photocatalytic-biological coupling reactor enhanced wastewater treatment device, which mainly includes a reactor;

[0009] The reactor comprises a quartz tube, an LED light strip and a reaction type carrier; the LED light strip is wound around the outer wall of the quartz tube; and the reaction type carrier is arranged in the inner cavity of the quartz tube;

[0010] The reactive carrier is composed of a photocatalytic material, a carrier and a biofilm;

[0011] The carrier is hollow, the photocatalytic material is arranged on the outside of the carrier, and the biofilm is arranged on the inside of the carrier.

[0012] In one embodiment of the present invention, the LED light strip is spirally wound around the outer wall of the quartz tube.

[0013] In one embodiment of the present invention, the spiral winding pitch of the LED light strip can be adjusted, and the radiation intensity of the light source can be controlled by changing the number of effectively exposed lamp beads.

[0014] In one embodiment of the present invention, the power supply of the LED light strip is regulated by voltage transformation, and the radiation intensity of the light source is controlled by changing the voltage.

[0015] In one embodiment of the present invention, the LED light strip can control the type of light source by replacing it with ultraviolet light source or visible light source lamp beads.

[0016] In one embodiment of the present invention, the quartz tube is a circular tube or a square tube; the diameter of the circular tube or the hydraulic diameter is 3-12 cm.

[0017] In one embodiment of the present invention, joints are respectively provided at both ends of the quartz tube for connecting with a pipeline or a valve; the valve controls the flow direction of the wastewater.

[0018] In one embodiment of the present invention, the carrier is a conductive material; for example, it is one of carbon paper, carbon felt, and a conductive polymer material.

[0019] In one embodiment of the present invention, the carrier is a triangular prism with a triangular cavity in cross section formed by carbon paper or a cylinder with a circular cavity in cross section formed by carbon paper.

[0020] In one embodiment of the present invention, the reaction type carrier is arranged in the inner cavity of the quartz tube, and the light source generated by the LED light strip is irradiated toward the photocatalytic material on the reaction type carrier.

[0021] In one embodiment of the present invention, the photocatalytic material is BiVO4 / g-C3N4; and the biofilm is a biofilm with autotrophic denitrification function.

[0022] In one embodiment of the present invention, the preparation method of the reactive carrier is:

[0023] (1) Cut the carbon paper into strips with a length of 150 mm and a width of 10 mm; rinse it in ultrapure water for 1 min and then rinse it in anhydrous ethanol for 1 min for several times until no substance is precipitated on the surface, and then dry it in an oven at 105°C overnight to remove surface impurities.

[0024] (2) 7mmol Bi(NO3)3·5H2O was dissolved in 30mL HNO3 1.5mol / L and stirred vigorously, labeled as solution I; 7mmol NH4VO3 was dissolved in 30mL HNO3 (1.5mol / L) and mixed by ultrasonic enhancement, labeled as solution II;

[0025] Then, solution II was dripped into solution I by stirring, and then the pH value was adjusted to 9 with NH3·H2O. The particle sedimentation was observed. After stirring for 30 min, the precursor solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene and kept at 200°C for 24 h and then cooled to room temperature. The solid was washed with ultrapure water and anhydrous ethanol several times by centrifugation to remove surface impurities, and then dried at 80°C overnight. The obtained product was recorded as BiVO4.

[0026] 100 mg of the prepared BiVO4 was completely dispersed in 100 mL of methanol solution under ultrasound assistance for 30 min;

[0027] 900 mg of g-C3N4 was put into the BiVO4 solution and ultrasonically treated for 30 min. The solution was stirred at 80°C with a magnetic stirrer until the solution was completely evaporated. Finally, the solution was dried in a vacuum oven at 60°C for 12 h to obtain a BiVO4 / g-C3N4 photocatalytic material.

[0028] (3) BiVO4 / g-C3N4 was dispersed into 8% PVDF / DMA hydrophilic conductive binder under ultrasonic conditions to make it completely dispersed and coated on carbon paper respectively and then heated at 200°C for 6h to obtain a carrier loaded with BiVO4 / g-C3N4 photocatalytic material.

[0029] (4) Loading of biofilm with autotrophic denitrification function, the microbial source is the effluent of a long-term sulfur autotrophic denitrification filter. The prepared carrier with BiVO4 / g-C3N4 photocatalyst loaded on one side and the interface without catalyst loaded on the other side were contacted with microbial inoculum for microbial colonization. The inoculation was carried out for a total of 15 days, and the solution was changed every 5 days.

[0030] In one embodiment of the present invention, three carriers loaded with photocatalysts and biofilms are fixed on a hollow plastic tube to form a triangular hollow structure, with the side with the photocatalyst layer facing outward and the side loaded with the biofilm facing inward. The structure is fixed in the middle of the quartz tube using cotton thread to form a modular reactor.

[0031] In one embodiment of the present invention, the reactor can be used alone or in multiple series or parallel connections; the multiple reactors are connected by pipelines, and the wastewater flow direction is controlled by three-way valves.

[0032] In one embodiment of the present invention, the continuous flow photocatalytic-biological coupling reactor enhanced wastewater treatment device also includes a water inlet pump, a circulation pump, a water inlet device and a water outlet device; the water inlet pump connects the water inlet device and the reactor through a pipeline; the circulation pump circulates the wastewater in the reactor through the pipeline.

[0033] In one embodiment of the present invention, the water inlet device pumps the wastewater into the reactor through the water inlet pump; the sampling port monitors the wastewater treatment situation. When the wastewater treatment does not meet the discharge standard, the wastewater is returned to the reactor for circulation treatment through the circulation pump. When the wastewater treatment meets the discharge standard, the wastewater is discharged through the water outlet device.

[0034] The second object of the present invention is to provide a method for treating wastewater by using the above-mentioned continuous flow photocatalysis-biological coupling reactor to enhance the wastewater treatment device.

[0035] In one embodiment of the present invention, the water inlet device pumps the wastewater into the reactor through the water inlet pump; at the same time, the LED light strip is started to prompt the wastewater to react in the reactor, and the sampling port monitors the wastewater treatment status. When the wastewater treatment does not meet the emission standards, the wastewater is returned to the reactor for circulation treatment through the circulation pump. When the wastewater treatment meets the emission standards, the wastewater is discharged through the water outlet device.

[0036] The beneficial technical effects of the present invention are:

[0037] (1) The present invention uses a conductive material as a carrier and fixes the carrier in a reactor to form a hollow shape. A photocatalyst is coated on the outer light-facing surface and a microbial film is grown on the inner light-backed surface, so that the photocatalytic process and the microbial metabolic process occur at different side interfaces of the carrier respectively.

[0038] (2) The present invention separates the photocatalytic process and the biological metabolic process on both sides of the conductive carrier, effectively reducing the effect of light on denitrification microorganisms; at the same time, it avoids the free radicals generated in the photocatalytic process from killing the microorganisms.

[0039] (3) After the present invention separates the photocatalytic interface and the microbial metabolism interface, there is no biofilm barrier on the light-facing side, and the photocatalytic efficiency is higher; the microbial film on the backlight side is directly attached to the carrier surface, without the influence of the photocatalyst, and the mass transfer efficiency is higher.

[0040] (4) The present invention can transfer the photogenerated electrons generated on the photocatalytic interface to the denitrifying and denitrifying microorganisms on the other side through the conductive material, thereby achieving partial or even complete autotrophic denitrification, eliminating or reducing the demand for external carbon sources in the denitrification process, and achieving low-carbon green denitrification.

[0041] (5) The reactor of the present invention adopts a modular form, and the intensity and type of the light source are adjustable and optional, which is suitable for deep treatment of different types of wastewater. The efficiency of the photocatalytic process and the denitrification process has significant advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the photocatalytic-biological coupling reactor of the present invention.

[0043] Figure 2The present invention is a preparation process of the reactive carrier.

[0044] Figure 3 The operating effect of the photocatalytic-biological coupling reactor of the present invention is shown.

[0045] Figure 4 The present invention is used to compare the operating effects of the continuous flow mode of the continuous flow photocatalytic-biological coupling reactor for treating simulated wastewater and actual wastewater.

[0046] In the figure, 1. quartz tube; 2. LED light strip; 3. sampling port; 4. photocatalytic material; 5. carrier; 6. biofilm; 7. water inlet pump; 8. circulation pump; 9. water inlet device; 10. water outlet device; 11. reactive carrier. DETAILED DESCRIPTION

[0047] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0048] A continuous flow photocatalytic-biological coupling reactor enhanced wastewater treatment device mainly comprises a reactor; the reactor comprises a quartz tube 1, an LED light strip 2 and a reaction type carrier 11; the LED light strip 2 is wound around the outer wall of the quartz tube 1; the reaction type carrier 11 is arranged in the inner cavity of the quartz tube 1;

[0049] The reactive carrier 11 is composed of a photocatalytic material 4, a carrier 5 and a biofilm 6;

[0050] The carrier 5 is hollow, the photocatalytic material 4 is arranged on the outside of the carrier 5 , and the biofilm 6 is arranged on the inside of the carrier 5 .

[0051] The LED light strip 2 is spirally wound around the outer wall of the quartz tube 1 .

[0052] The carrier 5 is one of carbon paper, carbon felt and conductive polymer material.

[0053] The carrier 5 is a triangular prism with a triangular cavity in cross section formed by carbon paper or a cylinder with a circular cavity in cross section formed by carbon paper.

[0054] The photocatalytic material 4 is BiVO4 / g-C3N4; the biofilm 6 is a biofilm with autotrophic denitrification function.

[0055] The preparation method of the reactive carrier 11 is as follows:

[0056] (1) Cut the carbon paper into strips with a length of 150 mm and a width of 10 mm; rinse it in ultrapure water for 1 min and then rinse it in anhydrous ethanol for 1 min for several times until no substance is precipitated on the surface, and then dry it in an oven at 105°C overnight to remove surface impurities.

[0057] (2) 7mmol Bi(NO3)3·5H2O was dissolved in 30mL HNO3 1.5mol / L and stirred vigorously, labeled as solution I; 7mmol NH4VO3 was dissolved in 30mL HNO3 (1.5mol / L) and mixed by ultrasonic enhancement, labeled as solution II;

[0058] Then, solution II was dripped into solution I by stirring, and then the pH value was adjusted to 9 with NH3·H2O. The particle sedimentation was observed. After stirring for 30 min, the precursor solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene and kept at 200°C for 24 h and then cooled to room temperature. The solid was washed with ultrapure water and anhydrous ethanol several times by centrifugation to remove surface impurities, and then dried at 80°C overnight. The obtained product was recorded as BiVO4.

[0059] 100 mg of the prepared BiVO4 was completely dispersed in 100 mL of methanol solution under ultrasound assistance for 30 min;

[0060] 900 mg of g-C3N4 was put into the BiVO4 solution and ultrasonically treated for 30 min. The solution was stirred at 80°C with a magnetic stirrer until the solution was completely evaporated. Finally, the solution was dried in a vacuum oven at 60°C for 12 h to obtain a BiVO4 / g-C3N4 photocatalytic material.

[0061] (3) BiVO4 / g-C3N4 was dispersed into 8% PVDF / DMA hydrophilic conductive binder under ultrasonic conditions to make it completely dispersed and coated on carbon paper respectively and then heated at 200°C for 6h to obtain a carrier loaded with BiVO4 / g-C3N4 photocatalytic material.

[0062] (4) Loading of biofilm with autotrophic denitrification function, the microbial source is the effluent of a long-term sulfur autotrophic denitrification filter. The prepared carrier with BiVO4 / g-C3N4 photocatalyst loaded on one side and the interface without catalyst loaded on the other side were contacted with microbial inoculum for microbial colonization. The inoculation was carried out for a total of 15 days, and the solution was changed every 5 days.

[0063] In one embodiment of the present invention, three carriers loaded with photocatalysts and biofilms are fixed on a hollow plastic tube to form a triangular hollow structure, with the side with the photocatalyst layer facing outward and the side loaded with the biofilm facing inward. The structure is fixed in the middle of the quartz tube using cotton thread to form a modular reactor.

[0064] The reactor can be used alone or in series or in parallel; multiple reactors are connected by pipelines, and the flow direction of wastewater is controlled by three-way valves.

[0065] The continuous flow photocatalytic-biological coupling reactor enhanced wastewater treatment device also includes a water inlet pump 7, a circulation pump 8, a water inlet device 9 and a water outlet device 10; the water inlet pump 7 connects the water inlet device 9 and the reactor through a pipeline; the circulation pump 8 circulates the wastewater in the reactor for treatment through the pipeline.

[0066] The water inlet device 9 pumps the wastewater into the reactor through the water inlet pump 7; the sampling port 3 monitors the wastewater treatment. When the wastewater treatment does not meet the discharge standard, the wastewater is returned to the reactor for circulation treatment through the circulation pump 8. When the wastewater treatment meets the discharge standard, the wastewater is discharged through the water outlet device 10.

[0067] A method for treating wastewater by using the above-mentioned continuous flow photocatalytic-biological coupling reactor to enhance the wastewater treatment device, the water inlet device 9 pumps the wastewater into the reactor through the water inlet pump 7; at the same time, the LED light strip 2 is started to promote the reaction of the wastewater in the reactor, and the sampling port 3 monitors the wastewater treatment situation. When the wastewater treatment does not meet the discharge standard, the wastewater is returned to the reactor for circulation treatment through the circulation pump 8. When the wastewater treatment meets the discharge standard, the wastewater is discharged through the water outlet device 10.

[0068] Example 1

[0069] Reference Figure 1 A continuous flow photocatalytic-biological coupling reactor enhanced wastewater treatment device mainly comprises a reactor; the reactor comprises a quartz tube 1, an LED light strip 2 and a reaction type carrier 11; the LED light strip 2 is wound around the outer wall of the quartz tube 1; the reaction type carrier 11 is arranged in the inner cavity of the quartz tube 1;

[0070] The quartz tube 1 has a length of 250 mm, an outer diameter of 30 mm, and an inner diameter of 26 mm, wherein the effective illumination length is 150 mm;

[0071] Both ends of the quartz tube 1 are sealed with plastic material, and an inlet and an outlet are left;

[0072] The reactive carrier 11 is composed of a photocatalytic material 4, a carrier 5 and a biofilm 6;

[0073] The photocatalytic material 4 is BiVO4 / g-C3N4, which is loaded onto the outside of the carrier 5 by a drop coating method, and the biofilm 6 with a denitrification function is arranged on the inside of the carrier 5.

[0074] The LED light strip 2 is spirally wound around the outer wall of the quartz tube 1; the intensity of a single lamp bead is 59.83±0.25mW, and there are 60 lamp beads in total.

[0075] Carrier 5 is carbon paper with a length of 150 mm and a width of 10 mm. A plastic tube is used as a supporting material, and three pieces of carbon paper are respectively pasted on the outside of the plastic tube to form a hollow structure with a triangular cross-section, in which the side loaded with the photocatalytic material faces outward to form the light-facing side, and the side loaded with the microorganisms faces inward to form the backlight side.

[0076] The reaction solution was prepared with distilled water, containing 25 mg / L sodium acetate, 500 mg / L sodium bicarbonate, 10 mg / L ciprofloxacin and 15 mg / L nitrate, and was operated in a circulation mode. The operation cycle was 12 hours, and samples were taken every 2 hours. The initial sample concentration was C0, and the concentration at each sampling point was C t , and calculated the removal rates of ciprofloxacin and nitrate.

[0077] Figure 3 The photocatalytic-biological coupling reactor of the present invention is compared with the removal effect of the model emerging pollutants ciprofloxacin and nitrate under light and no light conditions. It can be seen that in the photocatalytic-biological coupling reactor of the present invention, compared with the no light condition, the removal rate of ciprofloxacin under light is increased by about 68%, and the removal rate of nitrate is increased by about 35%.

[0078] Example 2

[0079] Reference Figure 1 A continuous flow photocatalytic-biological coupling reactor enhanced wastewater treatment device mainly comprises a reactor; the reactor comprises a quartz tube 1, an LED light strip 2 and a reaction type carrier 11; the LED light strip 2 is wound around the outer wall of the quartz tube 1; the reaction type carrier 11 is arranged in the inner cavity of the quartz tube 1;

[0080] The quartz tube 1 has a length of 250 mm, an outer diameter of 30 mm, and an inner diameter of 26 mm, wherein the effective illumination length is 150 mm;

[0081] Both ends of the quartz tube 1 are sealed with plastic material, and an inlet and an outlet are left;

[0082] The reactive carrier 11 is composed of a photocatalytic material 4, a carrier 5 and a biofilm 6;

[0083] The photocatalytic material 4 is BiVO4 / g-C3N4, which is loaded onto the outside of the carrier 5 by a drop coating method, and the biofilm 6 with a denitrification function is arranged on the inside of the carrier 5.

[0084] The LED light strip 2 is spirally wound around the outer wall of the quartz tube 1; the intensity of a single lamp bead is 59.83±0.25mW, and there are 60 lamp beads in total.

[0085] Carrier 5 is carbon paper with a length of 150 mm and a width of 10 mm. A plastic tube is used as a supporting material, and three pieces of carbon paper are respectively pasted on the outside of the plastic tube to form a hollow structure with a triangular cross-section, in which the side loaded with the photocatalytic material faces outward to form the light-facing side, and the side loaded with the microorganisms faces inward to form the backlight side.

[0086] Eight reactors were connected in series through a three-way connector to form a continuous flow photocatalytic-biological coupling reactor.

[0087] The water inlet device 9 pumps the wastewater into the reactor through the water inlet pump 7; at the same time, the LED light strip 2 is started to prompt the wastewater to react in the reactor, and the sampling port 3 monitors the wastewater treatment. When the wastewater treatment does not meet the discharge standard, the wastewater is returned to the reactor for circulation treatment through the circulation pump 8. When the wastewater treatment meets the discharge standard, the wastewater is discharged through the water outlet device 10.

[0088] The influent was the effluent from the local sewage treatment plant. Sodium acetate (25 mg / L) was added according to the measured water quality, and the concentrations of nitrate and ciprofloxacin were set to 10 mg / L and 15 mg / L, respectively. Sodium bicarbonate (250 mg / L) was also added. The system was operated in a continuous flow mode with a hydraulic retention time of 6 h and a light intensity of 70 mW / cm 2 , sampling once a day, with the initial sample concentration as C0 and the concentration at each sampling point as C t , and calculated the removal rates of ciprofloxacin and nitrate.

[0089] Figure 4 The continuous flow photocatalytic-biological coupling reactor of the present invention is used to compare the removal effects of the model emerging pollutants ciprofloxacin and nitrate under simulated wastewater and actual wastewater conditions. It can be seen that the removal rate of ciprofloxacin in the simulated wastewater is 89.5%, while that in the actual wastewater is 91.7%; compared with the simulated wastewater, the removal rate of nitrate in the actual wastewater is increased by 15.6%.

[0090] The embodiments provided above are not intended to limit the scope of the present invention, and the steps described are not intended to limit the execution order thereof. Those skilled in the art may make obvious improvements to the present invention in combination with existing common knowledge, which also fall within the scope of protection defined by the claims of the present invention.

Claims

1. A continuous flow photocatalytic-biological coupling reactor enhanced wastewater treatment device, characterized in that: The device mainly comprises a reactor; the reactor comprises a quartz tube (1), an LED light strip (2) and a reaction-type carrier (11); the LED light strip (2) is wound around the outer wall of the quartz tube (1); and the reaction-type carrier (11) is arranged in the inner cavity of the quartz tube (1); The reaction type carrier (11) is composed of a photocatalytic material (4), a carrier (5) and a biofilm (6); The carrier (5) is hollow, the photocatalytic material (4) is arranged on the outside of the carrier (5), and the biofilm (6) is arranged on the inside of the carrier (5).

2. The continuous flow photocatalytic-biological coupled reactor enhanced wastewater treatment device according to claim 1, characterized in that: The LED light strip (2) is spirally wound around the outer wall of the quartz tube (1).

3. The continuous flow photocatalytic-biological coupled reactor enhanced wastewater treatment device according to claim 1, characterized in that: The carrier (5) is one of carbon paper, carbon felt and conductive polymer material.

4. The continuous flow photocatalytic-biological coupled reactor enhanced wastewater treatment device according to claim 1, characterized in that: The carrier (5) is a triangular prism with a triangular cavity in cross section formed by carbon paper or a cylinder with a circular cavity in cross section formed by carbon paper.

5. The continuous flow photocatalytic-biological coupled reactor enhanced wastewater treatment device according to claim 1, characterized in that: The photocatalytic material (4) is BiVO4 / g-C3N4; and the biofilm (6) is a biofilm with autotrophic denitrification function.

6. The continuous flow photocatalytic-biological coupled reactor enhanced wastewater treatment device according to claim 1, characterized in that: The reactor can be used alone or in series or in parallel; multiple reactors are connected by pipelines, and the flow direction of wastewater is controlled by three-way valves.

7. The continuous flow photocatalytic-biological coupled reactor enhanced wastewater treatment device according to claim 1, characterized in that: It also includes a water inlet pump (7), a circulation pump (8), a water inlet device (9) and a water outlet device (10); The water inlet pump (7) connects the water inlet device (9) and the reactor through a pipeline; The circulation pump (8) circulates the wastewater in the reactor through the pipeline for treatment.

8. The continuous flow photocatalytic-biological coupled reactor enhanced wastewater treatment device according to claim 7, characterized in that: The water inlet device (9) pumps the wastewater into the reactor via the water inlet pump (7); the sampling port (3) monitors the wastewater treatment status. When the wastewater treatment does not meet the discharge standard, the wastewater is returned to the reactor for circulation treatment via the circulation pump (8); when the wastewater treatment meets the discharge standard, the wastewater is discharged via the water outlet device (10).

9. A method for treating wastewater by using the continuous flow photocatalysis-biological coupling reactor enhanced wastewater treatment device according to any one of claims 1 to 8.

10. The method according to claim 9, characterized in that The water inlet device (9) pumps the wastewater into the reactor via the water inlet pump (7); At the same time, the LED light strip (2) is started to promote the reaction of the wastewater in the reactor, and the sampling port (3) monitors the wastewater treatment status. When the wastewater treatment does not meet the discharge standard, the wastewater is returned to the reactor for circulation treatment through the circulation pump (8). When the wastewater treatment meets the discharge standard, the wastewater is discharged through the water outlet device (10).

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