Photoreaction device for efficiently degrading pollutants in water

Abstract

The invention belongs to the field of chemical reaction devices, and particularly relates to a photoreaction device for efficiently degrading pollutants in water, which comprises a photoreactor, a liquid circulation system and a constant-temperature water bath layer, wherein the photoreactor comprises a detachable light source, a high-purity quartz annular reaction layer, a top cover body and a bottom cover body; a top cover body and a bottom cover body are respectively arranged at the top and the bottom of the photoreactor, and a detachable light source is vertically arranged in the photoreactor; the detachable light source is detachably fixed with the top cover body; the outer side of the photoreactor is sleeved with a constant-temperature water bath layer; the liquid circulation system comprises a liquid outlet pipe, a liquid return pipe and a sample container, one end of the liquid outlet pipe is communicated with the sample container, the other end of the liquid outlet pipe is detachably communicated with the high-purity quartz annular reaction layer, one end of the liquid return pipe is communicated with the sample container, and the other end of the liquid return pipe is detachably communicated with the high-purity quartz annular reaction layer.

Description

Technical Field

[0001] The present application belongs to the field of chemical reaction devices, and specifically relates to a photoreaction device for efficiently degrading pollutants in water. Background Art

[0002] Currently, antibiotics are mainly discharged into the water environment through multiple sources such as municipal sewage treatment plants, centralized livestock farms, hospitals, pharmaceutical factories and chemical plants. As most antibiotics are highly water-soluble and chemically stable, it is difficult to effectively remove them with traditional water treatment technologies.

[0003] The persistence and bioaccumulation of antibiotics in the environment have attracted widespread attention. In order to study the migration, transformation and degradation process of antibiotics in the aquatic environment, technicians can use photoreaction systems to conduct relevant experiments. Photoreaction systems can use visible light or visible light as a light source for photocatalytic reactions. Vacuum ultraviolet light (VUV) has high photon energy and can accelerate the photodegradation rate of organic pollutants. In addition, VUV light can also directly split water molecules to produce highly oxidizing hydroxyl radicals, thereby further oxidizing and degrading organic pollutants in water.

[0004] The current photoreaction devices have at least the following problems:

[0005] Since VUV is easily absorbed when propagating in water, only the water to be degraded in the area near the lamp can be effectively irradiated, so the size of the quartz tubes currently used is very small. Due to the small size of the quartz tubes, they are very easy to be damaged during transportation or during the light source switching process, and the sample solution they can accommodate is limited, resulting in limited photon utilization efficiency. Summary of the invention

[0006] The present application provides a photoreaction device for efficiently degrading pollutants in water, comprising:

[0007] Photoreactor, liquid circulation system and constant temperature water bath layer;

[0008] The photoreactor comprises: a detachable light source, a high-purity quartz annular reaction layer, a top cover, and a bottom cover;

[0009] A top cover and a bottom cover are respectively arranged at the top and bottom of the photoreactor, and a detachable light source is vertically arranged in the photoreactor; the detachable light source is detachably fixed to the top cover;

[0010] The outer side of the photoreactor is provided with a constant temperature water bath layer;

[0011] The liquid circulation system includes: a liquid outlet pipe, a liquid return pipe and a sample container, one end of the liquid outlet pipe is connected to the sample container, and the other end of the liquid outlet pipe is detachably connected to the high-purity quartz annular reaction layer, one end of the liquid return pipe is connected to the sample container, and the other end of the liquid return pipe is detachably connected to the high-purity quartz annular reaction layer.

[0012] Optionally, the outer wall of the high-purity quartz annular reaction layer is the inner wall of the constant temperature water bath layer.

[0013] Optionally, the detachable light source includes any one of the following: a visible light source, a UV light source, a VUV light source.

[0014] Optionally, the detachable light source is detachably fixed to the top cover body by means of screws, buckles or connectors.

[0015] Optionally, the length of the high-purity quartz annular reaction layer is 100-420 mm, and the outer diameter of the high-purity quartz annular reaction layer is 50 mm.

[0016] Optionally, a high-purity nitrogen inlet pipe and a high-purity nitrogen exhaust pipe are respectively provided on the photoreactor, the high-purity nitrogen inlet pipe is connected to the high-purity nitrogen bottle, and the high-purity nitrogen exhaust pipe is connected to the outside air.

[0017] Optionally, a peristaltic pump is connected to the middle portion of the liquid outlet pipe, and the flow rate of the peristaltic pump is 600-1200 mL / min.

[0018] Optionally, the liquid circulation system further comprises:

[0019] The magnetic stirrer is used for placing a sample container, wherein a magnetic stirring rotor is placed in the sample container.

[0020] Optionally, a water outlet and a water inlet are respectively provided at the top and bottom of the constant temperature water bath layer, the water outlet of the constant temperature water bath layer is connected to the water inlet of the cooling circulator through a water outlet pipe, and the water outlet of the cooling circulator is connected to the water inlet of the constant temperature water bath layer through a water inlet pipe.

[0021] Optionally, the sample container can accommodate a reaction solution volume of 500-1000 mL.

[0022] The photoreaction device for efficiently degrading pollutants in water provided by the present application includes: a photoreactor, a liquid circulation system and a constant temperature water bath layer; wherein the photoreactor includes: a detachable light source, a high-purity quartz annular reaction layer, a top cover body, and a bottom cover body; the top and bottom of the photoreactor are respectively provided with a top cover body and a bottom cover body, and a detachable light source is vertically arranged in the photoreactor; the detachable light source and the top cover body are detachably fixed; a constant temperature water bath layer is arranged on the outside of the photoreactor; on the one hand, the high-purity quartz annular reaction layer can make the structure of the entire photoreaction device more compact and stable, which can not only reduce the volume of the photoreaction device, but also facilitate the transportation of the device and extend the service life of the photoreaction device. On the other hand, compared with the traditional high-purity quartz capillary, the volume of the high-purity quartz annular reaction layer is significantly increased, which can increase the irradiation area of ​​the light source and the utilization efficiency of photons, reduce the cost of sewage treatment, and improve the treatment efficiency of sewage. In addition, the high-purity quartz annular reaction layer can increase the amount of wastewater treated in a single test, so that each sampling in the detection process has little effect on the total volume of the reaction solution, or even negligible, thereby ensuring the scientificity and accuracy of the experimental results. Furthermore, the high-purity quartz annular reaction layer can greatly increase the amount of wastewater treated per unit time, laying a good foundation for the practical promotion and application of related water treatment technologies in the future. Therefore, the light reaction device provided in the embodiment of the present application can improve the utilization efficiency of photons and the accuracy of experimental results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a photoreaction device provided in an embodiment of the present application;

[0024] Figure 2 This is a top view of a high-purity quartz annular reaction layer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] On the one hand, if Figure 1 As shown, this embodiment provides a light reaction device, including:

[0027] Photoreactor 10, liquid circulation system 20 and constant temperature water bath layer 30;

[0028] The photoreactor 10 includes: a detachable light source 11, a high-purity quartz annular reaction layer 12, a top cover 13, and a bottom cover 14;

[0029] A top cover 13 and a bottom cover 14 are respectively disposed at the top and bottom of the photoreactor 10, and a detachable light source 11 is vertically disposed inside the photoreactor; the detachable light source 11 is detachably fixed to the top cover 13;

[0030] The outer side of the photoreactor is provided with a constant temperature water bath layer 30;

[0031] The liquid circulation system 20 includes: a liquid outlet pipe 21, a liquid return pipe 22 and a sample container 23. One end of the liquid outlet pipe 21 is connected to the sample container 23, and the other end of the liquid outlet pipe 21 is detachably connected to the high-purity quartz annular reaction layer 12. One end of the liquid return pipe 22 is connected to the sample container 23, and the other end of the liquid return pipe 22 is detachably connected to the high-purity quartz annular reaction layer 12.

[0032] The detachable light source 11 refers to a light source inside the photoreactor that can be easily disassembled and replaced, such as a UV lamp or a light emitting diode (LED) lamp, etc., which facilitates maintenance and optimization of the light source and improves the flexibility and adaptability of the system.

[0033] The high-purity quartz annular reaction layer 12 is the main reaction area for placing photocatalysts or samples inside the photoreactor 10. The light emitted by the detachable light source 11 irradiates the high-purity quartz annular reaction layer 12 to stimulate the photocatalytic reaction or directly act on the sample.

[0034] like Figure 2 As shown, the top view of the high-purity quartz annular reaction layer 12 is annular, the outer diameter of the high-purity quartz annular reaction layer 12 is R, the inner diameter is r, and the length is L. Then, the volume of the sample that can be accommodated by the high-purity quartz annular reaction layer 12 is π(R 2 -r 2 )L.

[0035] In the embodiment of the present application, on the one hand, the high-purity quartz annular reaction layer 12 can make the structure of the entire photoreaction device more compact and stable, which can not only reduce the volume of the photoreaction device, but also facilitate the transportation of the device and extend the service life of the photoreaction device.

[0036] On the other hand, compared with traditional high-purity quartz capillary tubes, the volume of the high-purity quartz annular reaction layer is significantly larger, which can increase the irradiation area of ​​the light source and the utilization efficiency of photons, reduce the cost of sewage treatment, and improve the efficiency of sewage treatment.

[0037] In addition, the high-purity quartz annular reaction layer can increase the amount of wastewater treated in a single test, so that each sampling in the detection process has little or even negligible impact on the total volume of the reaction solution, ensuring the scientificity and accuracy of the experimental results.

[0038] Furthermore, the high-purity quartz annular reaction layer can significantly increase the amount of wastewater treated per unit time, laying a good foundation for the practical promotion and application of related water treatment technologies in the future.

[0039] The top cover and the bottom cover refer to the closed cover plates at the upper and lower ends of the photoreactor, which play the role of sealing the internal environment of the reactor and controlling conditions such as temperature.

[0040] The detachable light source and the top cover body are detachably fixed, which means that the light source, reaction layer and other components are detachably connected to the cover body, so that it is easy to open the photoreactor to perform operations such as light source maintenance.

[0041] In the embodiments of the present application, the annular reaction interlayer structure is stable, and the switching and updating of different detachable light sources can be easily achieved. By comparing the treatment effects of pollutants under different light sources, the mechanism can be explored.

[0042] The constant temperature water bath layer is a temperature-controlled water bath system arranged outside the photoreactor. Through the constant temperature water bath layer, the temperature conditions inside the reactor can be accurately controlled.

[0043] The liquid circulation system is a circulating flow system composed of a liquid outlet pipe, a liquid return pipe and a sample container, which can realize the continuous circulation of the reaction liquid between the reaction layer and the collection container, making it convenient to control the sample processing time and effect.

[0044] In a possible embodiment, the outer wall of the high-purity quartz annular reaction layer 12 is the inner wall of the constant temperature water bath layer 30 .

[0045] In a possible embodiment, the detachable light source 11 includes any one of the following: a visible light source, a UV light source, and a VUV light source.

[0046] The photoreactor can use detachable light sources 11 of different wavelength bands, which are described below respectively:

[0047] Visible light sources refer to light sources with wavelengths between 400 and 700 nm. Common visible light sources include tungsten lamps, halogen lamps, LEDs, etc. Visible light sources can excite certain photosensitive materials and drive visible light catalytic reactions.

[0048] UV light source refers to a light source in the UV frequency band with a wavelength between 100-400nm. Common UV light sources include mercury lamps, xenon lamps, UV LEDs, etc. UV has high energy and can effectively excite many photocatalysts and drive photocatalytic reactions.

[0049] VUV light source refers to the light source in the VUV band with a wavelength below 200nm. This light source usually needs to work in a vacuum or very low pressure environment because these wavelengths of light are easily absorbed by oxygen and other gases in the air. VUV has higher energy and can be used for some special photochemical reactions and material processing.

[0050] In the photoreactor, the appropriate visible light, UV or VUV light source can be selected according to the specific photochemical reaction process and material characteristics. The selection of different light sources will significantly affect the mechanism, rate and efficiency of the photoreaction.

[0051] In a possible embodiment, the detachable light source 11 is detachably fixed to the top cover 13 by means of screws, buckles or connectors.

[0052] The detachable light source 11 refers to a light source device that can be removed or separated. The detachable light source 11 can be connected to the top cover 13 in a variety of ways.

[0053] The detachable light source 11 can be directly fixed to the top cover 13 by screws, which is convenient for disassembly.

[0054] The detachable light source 11 can be locked together with the top cover 13 through a special buckle structure, so as to be easily separated.

[0055] The detachable light source 11 can be inserted into a special connector on the top cover 13 to form a detachable connection.

[0056] In a possible embodiment, the length of the high-purity quartz annular reaction layer 12 is 100-420 mm, and the outer diameter of the high-purity quartz annular reaction layer is 50 mm.

[0057] In a possible embodiment, illustratively, the length of the high-purity quartz annular reaction layer 12 is 420 mm.

[0058] In a possible embodiment, a high-purity nitrogen inlet pipe 15 and a high-purity nitrogen exhaust pipe 16 are respectively provided on the photoreactor, the high-purity nitrogen inlet pipe 15 is connected to the high-purity nitrogen bottle, and the high-purity nitrogen exhaust pipe 16 is connected to the outside air.

[0059] The photoreactor is equipped with the following two nitrogen pipelines:

[0060] The high-purity nitrogen gas inlet pipe 15 is connected to the high-purity nitrogen gas bottle, and high-purity nitrogen gas can be introduced into the interior of the photoreactor through the high-purity nitrogen gas inlet pipe 15.

[0061] The high-purity nitrogen exhaust pipe 16 is connected to the outside air. Through the high-purity nitrogen exhaust pipe 16, the gas inside the photoreactor can be discharged into the outside air.

[0062] By continuously supplying high-purity nitrogen into the reactor, active gases such as oxygen in the air can be removed, providing a reaction environment and supporting the reaction process.

[0063] In a possible embodiment, a peristaltic pump 24 is connected to the middle portion of the liquid outlet pipe, and the flow rate of the peristaltic pump is 600-1200 mL / min.

[0064] The peristaltic pump 24 can accurately control the flow rate of the liquid outlet to meet the liquid delivery requirements during the reaction process. The working principle of the peristaltic pump 24 is to produce a continuous, pulsation-free delivery effect by squeezing the hose through the roller, which can maintain the stable flow of the liquid in the liquid outlet pipe and avoid fluctuations in the flow rate, which is conducive to the smooth progress of the reaction process.

[0065] When the pressure in the reactor changes, the peristaltic pump 24 can prevent the liquid from flowing back into the reactor, thereby ensuring the stability of the reaction process. As an intermediate component of the liquid outlet pipe 21, the peristaltic pump 24 can be easily maintained and replaced, thereby improving the reliability of the entire system.

[0066] In a possible embodiment, the liquid circulation system 20 further includes:

[0067] The magnetic stirrer 25 is used to place the sample container 23 , and a magnetic stirring rotor is placed in the sample container 23 .

[0068] The magnetic stirrer 25 generates a controllable magnetic field to drive the magnetic stirring rotor inside the container to rotate, thereby achieving continuous stirring of the substances inside the sample container and increasing the contact and mixing between the reactants.

[0069] The sample container 23 is used to hold the raw materials or reactants that need to undergo photoreaction, and a magnetic stirring rotor is placed inside the container 23. When the magnetic stirring rotor is placed inside the sample container, it will rotate under the action of the external magnetic stirrer, thereby driving the reactants inside the container to mix.

[0070] In a possible embodiment, a water outlet and a water inlet are respectively provided at the top and the bottom of the constant temperature water bath layer, and the water outlet of the constant temperature water bath layer is connected to the water inlet of the cooling circulator through a water outlet pipe, and the water outlet of the cooling circulator is connected to the water inlet of the constant temperature water bath layer through a water inlet pipe.

[0071] The constant temperature water bath layer can maintain a constant temperature inside the water bath layer through continuous water inlet and outlet, providing a stable temperature environment for the photoreaction process. The outlet pipe and the inlet pipe form a closed circulating water circuit, connecting the constant temperature water bath layer with the cooling circulator. The cooling circulator can control the temperature of the circulating water and feed it back to the constant temperature water bath layer to maintain a constant temperature condition inside the photoreactor.

[0072] The coordinated work of the constant temperature water bath layer, circulation pipeline and cooling circulator provides precise temperature control for the photoreaction process, ensuring that the reaction can proceed at the optimal temperature.

[0073] In a possible embodiment, the volume of the reaction solution in the sample container is 500-1000mL. The photoreaction device for efficiently degrading pollutants in water provided by the present application includes: a photoreactor, a liquid circulation system and a constant temperature water bath layer; wherein the photoreactor includes: a detachable light source, a high-purity quartz annular reaction layer, a top cover body, and a bottom cover body; the top and bottom of the photoreactor are respectively provided with a top cover body and a bottom cover body, and a detachable light source is vertically arranged in the photoreactor; the detachable light source and the top cover body are detachably fixed; a constant temperature water bath layer is provided on the outer side of the photoreactor; on the one hand, the high-purity quartz annular reaction layer can make the structure of the entire photoreaction device more compact and stable, which can not only reduce the volume of the photoreaction device, but also facilitate the transportation of the device and extend the service life of the photoreaction device. On the other hand, the high-purity quartz annular reaction layer has a significantly larger volume than the traditional high-purity quartz capillary, which can increase the irradiation area of ​​the light source and the utilization efficiency of photons, reduce the cost of sewage treatment, and improve the treatment efficiency of sewage. In addition, the high-purity quartz annular reaction layer can increase the amount of wastewater treated in a single test, so that each sampling in the detection process has little effect on the total volume of the reaction solution, or even negligible, to ensure the scientificity and accuracy of the experimental results. Furthermore, the high-purity quartz annular reaction layer can greatly increase the amount of wastewater treated per unit time, laying a good foundation for the practical promotion and application of related water treatment technologies in the future. Therefore, the photoreaction device provided in the application embodiment can improve the utilization efficiency of photons and the accuracy of experimental results. The following is a description of the method of using the photoreaction device provided in the embodiment of the present application:

[0074] Experimental preparation stage:

[0075] Step 110, installing the detachable light source to the light reaction device;

[0076] Step 120, turn on the cooling circulator, pump ultrapure water into the annular constant temperature water bath layer through the cooling water inlet and discharge it from the cooling water outlet to reflux, so that the water temperature of the annular cooling temperature control interlayer is constant at 25°C;

[0077] Step 130, turning on the detachable light source of the photoreaction device to preheat the irradiation chamber, which may be preheated for more than 30 minutes, illustratively, for 40 minutes;

[0078] Step 140, open the high-purity nitrogen gas storage cylinder, continuously introduce high-purity nitrogen into the irradiation chamber through the high-purity nitrogen gas inlet and discharge it from the high-purity nitrogen gas exhaust port, so that the irradiation chamber is filled with high-purity nitrogen.

[0079] Regarding the formal experimental stage, the following is an explanation using a solution containing sulfadimethoxine (SMN) as an example. SMN is a common antibacterial drug used to treat bacterial infections.

[0080] Step 210, pouring an aqueous solution with an initial pH of 2.0 and an SMN concentration of 0.5 mg / L into a glass container, turning on a magnetic stirrer, and mixing the liquid in the glass container evenly under the action of the rapid rotation of the magnetic stirring rotor;

[0081] Step 220, quickly add high concentration hydrogen peroxide and FeCl3 stock solution to make hydrogen peroxide and Fe 3+ The concentrations in the glass container liquid reached 2.5 mg / L and 1.4 mg / L respectively;

[0082] Step 230, turning on the peristaltic pump, the reaction liquid in the glass container is pumped into the annular reaction interlayer under the action of the peristaltic pump, and reacts under the irradiation of the VUV lamp or UV lamp;

[0083] Step 240, sampling from the glass container every 120 seconds using a disposable sampler, and determining and analyzing the concentration of SMN in the sampled solution using ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS / MS) to obtain a degradation curve of SMN removal using the photo-Fenton technique when the initial pH is 2.0;

[0084] Photo-Fenton technology is an advanced oxidation technology that combines UV or VUV and Fenton reaction. It is mainly used in water treatment and wastewater treatment, especially for the degradation of organic pollutants.

[0085] Step 240, after the reaction is completed, the solution in the annular reaction layer is drained, and ultrapure water is injected to thoroughly clean the inlet and outlet connecting hoses and the inner wall of the annular reaction layer. After cleaning, the water in the connecting hose and the annular reaction layer is drained and the peristaltic pump is stopped.

Claims

1. A photoreaction device for efficiently degrading pollutants in water, characterized in that: include: Photoreactor, liquid circulation system and constant temperature water bath layer; The photoreactor comprises: a detachable light source, a high-purity quartz annular reaction layer, a top cover, and a bottom cover; A top cover and a bottom cover are respectively arranged at the top and bottom of the photoreactor, and a detachable light source is vertically arranged in the photoreactor; the detachable light source is detachably fixed to the top cover; The outer side of the photoreactor is provided with a constant temperature water bath layer; The liquid circulation system includes: a liquid outlet pipe, a liquid return pipe and a sample container, one end of the liquid outlet pipe is connected to the sample container, and the other end of the liquid outlet pipe is detachably connected to the high-purity quartz annular reaction layer, one end of the liquid return pipe is connected to the sample container, and the other end of the liquid return pipe is detachably connected to the high-purity quartz annular reaction layer.

2. The photoreaction device according to claim 1, characterized in that: The outer wall of the high-purity quartz annular reaction layer is the inner wall of the constant temperature water bath layer.

3. The photoreaction device according to any one of claims 1, characterized in that: The detachable light source includes any one of the following: a visible light source, an ultraviolet light source, and a vacuum ultraviolet light source.

4. The photoreaction device according to claim 1, characterized in that: The detachable light source is detachably fixed to the top cover body by means of screws, buckles or connectors.

5. The photoreaction device according to claim 1, characterized in that: The length of the high-purity quartz annular reaction layer is 100-420 mm, and the outer diameter of the high-purity quartz annular reaction layer is 50 mm.

6. The photoreaction device according to claim 1, characterized in that: A high-purity nitrogen inlet pipe and a high-purity nitrogen exhaust pipe are respectively arranged on the photoreactor. The high-purity nitrogen inlet pipe is connected to the high-purity nitrogen bottle, and the high-purity nitrogen exhaust pipe is connected to the outside air.

7. The photoreaction device according to claim 1, characterized in that: The middle part of the liquid outlet pipe is connected with a peristaltic pump, and the flow rate of the peristaltic pump is 600-1200mL / min.

8. The photoreaction device according to claim 1, characterized in that: The liquid circulation system also includes: The magnetic stirrer is used for placing a sample container, wherein a magnetic stirring rotor is placed in the sample container.

9. The photoreaction device according to claim 1, characterized in that: The top and bottom of the constant temperature water bath layer are respectively provided with a water outlet and a water inlet. The water outlet of the constant temperature water bath layer is connected to the water inlet of the cooling circulator through a water outlet pipe, and the water outlet of the cooling circulator is connected to the water inlet of the constant temperature water bath layer through a water inlet pipe.

10. The photoreaction device according to claim 1, characterized in that: The sample container can hold 500-1000mL of reaction solution.

Images