A continuous flow photocatalysis-biological coupling reactor reinforced wastewater treatment device and application thereof

Abstract

The application discloses a kind of continuous flow photocatalysis-biological coupling reactor reinforced wastewater treatment device and its application, mainly including reactor;The reactor includes quartz tube, LED lamp strip and reactive carrier;LED lamp strip is wound in the outer wall of quartz tube;Reactive carrier is arranged in the inner chamber of quartz tube;Reactive carrier is composed of photocatalytic material, carrier and biofilm;Carrier is hollow, photocatalytic material is arranged on the outside of carrier, and biofilm is arranged on the inside of carrier.Water inlet device pumps wastewater into reactor by water inlet pump;Start LED lamp strip at the same time, promote wastewater to react in reactor, sampling port monitors wastewater treatment condition, when wastewater treatment does not meet discharge standard, by circulating pump, wastewater is recycled back to reactor and recycled, when wastewater treatment meets discharge standard, wastewater is discharged by water outlet device.The reactor of the application is suitable for different types of wastewater advanced treatment, and the efficiency of photocatalysis and denitrification process is significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wastewater advanced treatment technology in environmental engineering, and particularly relates to a continuous flow photocatalysis-biological coupling reactor reinforced wastewater treatment device and application thereof. BACKGROUND

[0002] With the development of modernization, emerging pollutants are widely used in various activities due to their excellent physicochemical properties, leading to their increasing accumulation in wastewater. These emerging pollutants enter sewage treatment plants through industrial wastewater, medical wastewater and domestic wastewater, etc. However, the treatment equipment of conventional sewage treatment plants is mainly aimed at traditional pollutants, resulting in incomplete degradation of emerging pollutants. In addition, under the action of physics, chemistry and biology, emerging pollutants in sewage may form complexes with other traditional pollutants or have derivatives with greater toxicity. Under the long-term running state of the treatment unit, the concentration of emerging pollutants in water may be higher than that of the influent, resulting in a decrease in removal efficiency of the sewage treatment plant or even a negative value. Emerging pollutants have characteristics such as stability, biological accumulation and ecological toxicity, which pose a serious threat to human life and health. At present, the advanced removal technologies for emerging pollutants include biological methods, physical methods and chemical methods.

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

[0004] In addition, with the gradual improvement of water environment standards, the national requirements for conventional indicators of sewage discharge are becoming increasingly stringent. For example, the cities along the Taihu Lake have begun to adopt quasi-IV class requirements for sewage discharge, and the main control is the nitrogen index. Therefore, it is also the focus of ecological environment protection to deeply reduce the nitrogen content in the secondary effluent at low cost and high efficiency.

[0005] Based on the above analysis, it is urgent to develop a technology for simultaneously removing emerging pollutants and nitrate nitrogen from secondary effluent of sewage treatment plant, while taking into account investment and operating costs, environmental protection and stability. The photocatalysis-biological coupling process is an effective technology for removing pollutants by using photocatalytic treatment technology and microbial treatment technology, but the related technologies disclosed so far have many problems, such as 1) the photo-generated electrons and holes generated in the photocatalytic process are easy to recombine, reducing the light utilization efficiency; 2) the free radicals generated in the photocatalytic process can cause toxicity and even killing effect on functional microorganisms in the biofilm; 3) the addition of external electrons is required for denitrifying microorganisms, resulting in high operating cost; 4) the modular design is not adopted, which cannot be flexibly adjusted to different water quality sources and operating conditions, and the practicability, economy and convenience are not good. The above problems restrict the popularization and application of the photocatalysis-biological coupling process. SUMMARY

[0006] In view of the above problems existing in the prior art, the present application provides a continuous flow photocatalysis-biological coupling reactor reinforced wastewater treatment device and its application. The present application uses a conductive material as a carrier, which improves the adjustment of the electronic structure of the photocatalyst and increases the efficiency of photoelectron transfer, constructs a carrier form separating the photocatalytic interface and the biodegradation interface, 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, which can realize the simultaneous removal of emerging pollutants and nitrate nitrogen at low cost and high efficiency; the modular design is adopted, which realizes flexible series / parallel assembly for different operating conditions, and has good practicability.

[0007] The technical scheme of the present application is as follows:

[0008] The first object of the present application is to provide a continuous flow photocatalysis-biological coupling reactor reinforced wastewater treatment device, which mainly comprises a reactor.

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

[0010] The reaction carrier is composed of a photocatalytic material, a carrier and a biofilm.

[0011] The carrier is hollow, the photocatalytic material is arranged on the outer side of the carrier, and the biofilm is arranged on the inner side of the carrier.

[0012] In an embodiment of the present application, the LED lamp strip is spirally wound on the outer wall of the quartz tube.

[0013] In an embodiment of the present application, the spiral winding pitch of the LED lamp strip can be adjusted, the number of effective exposed lamp beads is changed, and the radiation intensity of the light source is controlled.

[0014] In one embodiment of the present application, the power supply of the LED lamp strip adopts variable voltage regulation, and the radiation intensity of the light source is controlled by changing the voltage.

[0015] In one embodiment of the present application, the LED lamp strip can be replaced with ultraviolet light source or visible light source lamp beads to control the type of light source.

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

[0017] In one embodiment of the present application, the quartz tube is provided with a joint at each end for communication with the pipe or valve; the valve controls the flow direction of the wastewater.

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

[0019] In one embodiment of the present application, the carrier is a triangular prism with a triangular hollow cross section composed of carbon paper or a cylinder with a circular hollow cross section composed of carbon paper.

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

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

[0022] In one embodiment of the present application, the preparation method of the reaction carrier is as follows:

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

[0024] (2) Dissolve 7 mmol of Bi(NO3)3·5H2O in 30 mL of HNO3 1.5 mol / L and stir vigorously to mark as solution I; dissolve 7 mmol of NH4VO3 in 30 mL of HNO3(1.5 mol / L) and ultrasonically enhance the mixing to mark as solution II;

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

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

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

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

[0029] (4) The loading of the biological membrane with the autotrophic denitrification function, and the microbial species source was the effluent of a long-term running sulfur autotrophic denitrification filter. The prepared carrier loaded with the BiVO4 / g-C3N4 photocatalyst on one side, and the other side without loading the catalyst was contacted with a microbial inoculum, and the inoculation was performed for 15 d, and the liquid was replaced every 5 d.

[0030] In an embodiment of the present application, three carriers loaded with the photocatalyst and the biological membrane were fixed on a hollow plastic tube, to form a hollow structure with a triangular cross section, and the side with the photocatalyst layer was outward, and the side loaded with the biological membrane was inward. The above structure was fixed in the middle of a quartz tube by using cotton thread, to form a modular reactor.

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

[0032] In an embodiment of the present application, the continuous flow photocatalysis-biological coupling reactor for strengthening wastewater treatment device further comprises a water inlet pump, a circulating 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 circulating pump makes the wastewater circulate and be treated in the reactor through a pipeline.

[0033] In an embodiment of the present application, the water inlet device pumps wastewater into the reactor through a water inlet pump; the sampling port monitors the wastewater treatment, when the wastewater treatment does not meet the discharge standard, the wastewater is recycled back to the reactor for treatment through a circulating pump, when the wastewater treatment meets the discharge standard, the wastewater is discharged through the water outlet device.

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

[0035] In an embodiment of the present application, the water inlet device pumps wastewater into the reactor through a water inlet pump; at the same time, the LED light belt is started to promote the reaction of the wastewater in the reactor, the sampling port monitors the wastewater treatment, when the wastewater treatment does not meet the discharge standard, the wastewater is recycled back to the reactor for treatment through a circulating pump, when the wastewater treatment meets the discharge standard, the wastewater is discharged through the water outlet device.

[0036] The present application has the beneficial technical effects that:

[0037] (1) The present application uses conductive material as a carrier, and fixes the carrier in the reactor to form a hollow shape, coats photocatalyst on the light-accepting surface on the outside, and grows a microbial membrane on the light-avoiding surface on the inside, so that the photocatalytic process and the microbial metabolic process occur on different sides of the carrier.

[0038] (2) The present application separates the photocatalytic process and the biological metabolic process on the two sides of the conductive carrier, effectively reduces the influence of light on denitrifying microorganisms, and at the same time avoids the killing effect of free radicals generated in the photocatalytic process on microorganisms.

[0039] (3) After separating the photocatalytic interface and the microbial metabolic interface, the light-accepting surface is not blocked by the microbial membrane, and the photocatalytic efficiency is higher; the microbial membrane on the light-avoiding surface is directly attached to the surface of the carrier, and is not affected by the photocatalyst, so the mass transfer efficiency is higher.

[0040] (4) The present application can transfer the photo-generated electrons generated on the photocatalytic interface to the denitrifying denitrifying microorganisms on the other side through the conductive material, realize partial or even complete autotrophic denitrification, cancel or reduce the demand for external carbon source in the denitrification process, and realize low-carbon green denitrification.

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

[0042] Figure 1 The figure is a schematic diagram of the photocatalysis-biological coupling reactor of the present application.

[0043] Figure 2The preparation process of the reaction carrier of the application.

[0044] Figure 3 The operation effect of the photocatalysis-biological coupling reactor using the application.

[0045] Figure 4 The operation effect comparison of the continuous flow photocatalysis-biological coupling reactor using the application in continuous flow mode 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, circulating pump; 9, water inlet device; 10, water outlet device; 11, reaction carrier. DETAILED DESCRIPTION

[0047] The application will be specifically described below in combination with the drawings and examples.

[0048] A continuous flow photocatalysis-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 carrier 11; the LED light strip 2 is wound on the outer wall of the quartz tube 1; the reaction carrier 11 is arranged in the inner cavity of the quartz tube 1.

[0049] The reaction 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 outer side of the carrier 5, and the biofilm 6 is arranged on the inner side of the carrier 5.

[0051] The LED light strip 2 is spirally wound on 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 hollow cross section composed of carbon paper or a cylinder with a circular hollow cross section composed of carbon paper.

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

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

[0056] (1) Cut the carbon paper into a long strip with a length of 150 mm and a width of 10 mm; first, wash it in ultrapure water for 1 min, then wash it with anhydrous ethanol for 1 min, and repeat the cycle several times until no substance is precipitated on the surface; then, place it in an oven at 105 DEG C overnight for drying, so as to remove surface impurities.

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

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

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

[0060] 900 mg of g-C3N4 was put into the BiVO4 solution and ultrasonically treated for 30 min, and a magnetic stirrer was stirred at 80 ℃ until the solution was completely volatilized, and finally dried in a vacuum oven at 60 ℃ 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, and was completely dispersed to be coated on carbon paper, and then heated at 200 ℃ for 6 h to obtain a carrier loaded with a BiVO4 / g-C3N4 photocatalytic material.

[0062] (4) The loading of the biological membrane with the autotrophic denitrification function, and the microbial species source was the effluent of a long-term running sulfur autotrophic denitrification filter. The prepared carrier loaded with BiVO4 / g-C3N4 photocatalyst on one side and without catalyst on the other side was contacted with a microbial inoculum to carry out microbial colonization, and the inoculation was carried out for 15 d, and the liquid was replaced every 5 d.

[0063] In an embodiment of the present application, three carriers loaded with photocatalysts and biological membranes were fixed on a hollow plastic tube to form a hollow structure with a triangular cross section, and the side with the photocatalyst layer faced outward, and the side loaded with the biological membrane faced inward. The above structure was fixed in the middle of a quartz tube with cotton thread to form a modular reactor.

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

[0065] The continuous flow photocatalysis-biological coupling reactor reinforced wastewater treatment device also comprises a water inlet pump 7, a circulating pump 8, a water inlet device 9 and a water outlet device 10; the water inlet pump 7 is connected to the water inlet device 9 and the reactor through a pipeline; and the circulating pump 8 circulates the wastewater in the reactor through a 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 condition; when the wastewater treatment does not meet the discharge standard, the wastewater is returned to the reactor for circulation treatment through the circulating pump 8; and 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 continuous flow photocatalysis-biological coupling reactor reinforced wastewater treatment device, wherein the water inlet device 9 pumps the wastewater into the reactor through the water inlet pump 7; the LED lamp strip 2 is started at the same time to promote the reaction of the wastewater in the reactor; the sampling port 3 monitors the wastewater treatment condition; when the wastewater treatment does not meet the discharge standard, the wastewater is returned to the reactor for circulation treatment through the circulating pump 8; and when the wastewater treatment meets the discharge standard, the wastewater is discharged through the water outlet device 10.

[0068] Embodiment 1

[0069] Reference Figure 1 A continuous flow photocatalysis-biological coupling reactor reinforced wastewater treatment device mainly comprises a reactor; the reactor comprises a quartz tube 1, an LED lamp strip 2 and a reaction carrier 11; the LED lamp strip 2 is wound on the outer wall of the quartz tube 1; and the reaction 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 light irradiation length is 150 mm.

[0071] The quartz tube 1 is sealed at both ends by a plastic material and has an inlet and an outlet;

[0072] The reaction carrier 11 is composed of a photocatalytic material 4, a carrier 5 and a biological membrane 6.

[0073] The photocatalytic material 4 is BiVO4 / g-C3N4, which is loaded on the outer side of the carrier 5 by a drop coating method, and the biological membrane 6 with a denitrification function is arranged on the inner side of the carrier 5.

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

[0075] The carrier 5 is carbon paper with a length of 150 mm and a width of 10 mm; three pieces of carbon paper are pasted outside the plastic tube as a supporting material to form a hollow structure with a triangular cross section, wherein the side loaded with the photocatalytic material is outward to form a light-receiving surface, and the side loaded with the microorganism is inward to form a light-receiving surface.

[0076] The reaction solution is prepared by using distilled water, containing sodium acetate 25 mg / L, sodium bicarbonate 500 mg / L, ciprofloxacin 10 mg / L and nitrate 15 mg / L, and is operated in a circulating mode. The operation cycle is 12 h, and the sample is taken every 2 h, with the initial sample concentration as C0, and the concentration of each sampling point as C t , and the removal rates of ciprofloxacin and nitrate are calculated.

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

[0078] Example 2

[0079] Referring to Figure 1 A continuous flow photocatalysis-biological coupling reactor for strengthening wastewater treatment device mainly comprises a reactor; the reactor comprises a quartz tube 1, an LED lamp strip 2 and a reaction type carrier 11; the LED lamp strip 2 is wound outside 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 light length is 150 mm;

[0081] The quartz tube 1 is sealed at both ends by a plastic material, and has an inlet and an outlet;

[0082] The reaction type carrier 11 is composed of a photocatalytic material 4, a carrier 5 and a biological membrane 6;

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

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

[0085] The carrier 5 is carbon paper with a length of 150 mm and a width of 10 mm; three pieces of carbon paper are pasted outside a plastic tube as a supporting material to form a hollow structure with a triangular cross section, wherein the side loaded with photocatalytic material faces outward to form a light-receiving surface, and the side loaded with microorganisms faces inward to form a light-reflecting surface.

[0086] The eight reactors are connected in series through a three-way joint to form a continuous flow photocatalysis-biological coupling reactor.

[0087] The water inlet device 9 pumps wastewater into the reactor through the water inlet pump 7; at the same time, the LED lamp strip 2 is started to promote the reaction of wastewater 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 recycled back to the reactor through the circulating pump 8 for treatment, when the wastewater treatment meets the discharge standard, the wastewater is discharged through the water outlet device 10.

[0088] The influent is the effluent of a local wastewater treatment plant, supplemented with sodium acetate (25 mg / L) according to the measured water quality, and the concentrations of nitrate and ciprofloxacin are 10 mg / L and 15 mg / L, respectively, and sodium bicarbonate (250 mg / L) is added, and a continuous flow is adopted, the hydraulic retention time is maintained at 6 h, and the light intensity is 70 mW / cm 2 t The removal rates of ciprofloxacin and nitrate are calculated.

[0089] Figure 4 The removal effect of the continuous flow photocatalysis-biological coupling reactor of the application on model emerging pollutants ciprofloxacin and nitrate under simulated wastewater and actual wastewater conditions is compared. It can be seen that the removal rate of ciprofloxacin in simulated wastewater is 89.5%, and that in actual wastewater is 91.7%; compared with simulated wastewater, the removal rate of nitrate in actual wastewater is increased by 15.6%.

[0090] The above examples provided are not intended to limit the scope covered by the present application, and the described steps are not intended to limit the execution order. Those skilled in the art can make obvious improvements to the present application in combination with existing common knowledge, which also falls within the protection scope defined by the claims of the present application.​

Claims

1. A continuous flow photocatalytic-biocoupled reactor for enhanced wastewater treatment, characterized in that, It mainly includes reactors; The reactor includes a quartz tube (1), an LED light strip (2), and a reactive carrier (11); the LED light strip (2) is wrapped around the outer wall of the quartz tube (1); the reactive carrier (11) is disposed in the inner cavity of the quartz tube (1); The reactive carrier (11) is composed of photocatalytic material (4), carrier (5) and biomembrane (6); The carrier (5) is hollow, the photocatalytic material (4) is located on the outside of the carrier (5), and the biofilm (6) is located on the inside of the carrier (5); The carrier (5) is one of carbon paper, carbon felt, or conductive polymer material; The photocatalytic material (4) is BiVO4 / g-C3N4; the biofilm (6) is a biofilm with autotrophic denitrification function.

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

3. The continuous flow photocatalytic-biocoupled 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 made of carbon paper or a cylinder with a circular cavity in cross-section made of carbon paper.

4. The continuous flow photocatalytic-biocoupled reactor enhanced wastewater treatment device according to claim 1, characterized in that, The reactors can be used individually or in series or in parallel; multiple reactors are connected by pipes and the flow of wastewater between them is controlled by three-way valves.

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

6. The continuous flow photocatalytic-biocoupled reactor enhanced wastewater treatment device according to claim 5, characterized in that, The inlet device (9) pumps wastewater into the reactor through the inlet pump (7); the sampling port (3) monitors the wastewater treatment status. When the wastewater treatment does not meet the discharge standards, the wastewater is returned to the reactor for recycling treatment through the circulation pump (8). When the wastewater treatment meets the discharge standards, the wastewater is discharged through the outlet device (10).

7. A method for treating wastewater using a continuous flow photocatalytic-biocoupled reactor enhanced wastewater treatment device according to any one of claims 1-6.

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

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