CN218372019U - Sewage treatment plant based on microchannel coupling photocatalytic reaction - Google Patents

Abstract

The utility model discloses a sewage treatment device based on microchannel coupling photocatalytic reaction, which belongs to the technical field of sewage treatment, and the utility model discloses a through setting up including oxidant conveying system, sewage conveying system, microchannel coupling photocatalytic reactor and sewage treatment product receiving system, make the whole device utilize technical advantages such as microchannel reactor, photocatalysis and ultrasonic cavitation in coordination, can make sewage and oxidant obtain great contact reaction specific surface area, the heat mass transfer between the material is more abundant, the photocatalytic reaction can guarantee that the organic matter in the sewage obtains effective degradation; meanwhile, an ultrasonic generating device is arranged in the microchannel coupling photocatalytic reactor, so that the technical problem that the pretreated sewage is easy to cause channel blockage when entering the microchannel reactor for a long time.

Description

A sewage treatment device based on microchannel coupled photocatalytic reaction

technical field

The utility model belongs to the technical field of sewage treatment and relates to a sewage treatment device based on microchannel coupled photocatalytic reaction.

Background technique

The principle of photocatalysis is based on the redox ability of photocatalysts under the condition of light, so as to achieve the purpose of purifying pollutants, material synthesis and transformation, etc. As a new, efficient, safe and environmentally friendly pollutant treatment technology, photocatalytic technology has gained widespread attention and application, especially in wastewater treatment. However, the existing photocatalytic technology is limited by insufficient specific surface area, difficult to control the reaction, catalyst loading method and other problems, resulting in weak catalytic efficiency and the production of other harmful by-products, which to a certain extent limit the development and application of photocatalytic technology.

Microchannel reactor is a three-dimensional structural element with a characteristic size between 10 and 1000 μm manufactured by precision machining technology, which can be used for highly integrated micro-reactions with various functions such as chemical reaction, heat exchange, mixing, separation, analysis and control. system. As the core component of the microsystem, the microchannel reactor has the characteristics of high specific surface area, high fluid mixing efficiency, and heat and mass transfer rate that traditional reactors (such as flasks, reactors, etc.) do not have due to the miniaturization of the characteristic scale of the internal channel. Fast, high intrinsic safety, low process energy consumption, high integration, small amplification effect, strong controllability and other unique advantages. By changing the fluid heat transfer, mass transfer and flow characteristics to strengthen the chemical process, it is widely used in laboratories In the separation preparation and process industry, microchannel reactors also have certain applications in wastewater treatment, but there are still some shortcomings: 1) The use of chemical reactions can effectively remove heavy metal ions in sewage, but the chemical oxygen consumption in sewage 2) Even if the pretreated sewage enters the microchannel reactor and stays for a long time, it will easily cause channel blockage, which will affect the continuous start-up of the device.

Utility model content

In order to overcome the shortcomings of the above-mentioned prior art, the purpose of this utility model is to provide a kind of sewage treatment device based on microchannel coupled photocatalytic reaction, one of the technical problems for solving is that the chemical oxygen demand (COD) in sewage cannot be obtained Effective degradation, the second technical problem is that the pretreated sewage enters the microchannel reactor and stays for a long time, and it is easy to cause channel blockage.

In order to achieve the above object, the utility model adopts the following technical solutions to achieve:

The utility model discloses a sewage treatment device based on microchannel coupled photocatalytic reaction, which comprises an oxidant delivery system, a sewage delivery system, a microchannel coupled photocatalytic reactor and a sewage treatment product receiving system; the microchannel coupled photocatalytic reaction The device includes an upper microchannel reaction plate, a lower microchannel reaction plate, an ultraviolet lamp and an ultrasonic generating device; the upper microchannel reaction plate is fixedly arranged on the upper part of the lower microchannel reaction plate, and the ultraviolet lamp is fixedly arranged on the upper microchannel reaction Above the plate, the ultrasonic generating device is fixedly arranged at the bottom of the lower microchannel reaction plate; the oxidant delivery system and the sewage delivery system are respectively connected to the entrance of the upper microchannel reaction plate, and the sewage treatment product receiving system is connected to the lower floor The outlet of the microchannel reaction plate is connected.

Further, the sewage delivery system includes a sewage buffer device, a sewage pretreatment device and a sewage delivery device, the sewage buffer device is connected to the inlet of the sewage pretreatment device through a pipeline, and the sewage pretreatment The outlet of the device is connected to the inlet of the sewage conveying device through a pipeline, and the outlet of the sewage conveying device is connected to the inlet of the upper microchannel reaction plate.

Further, the oxidant delivery system includes an oxidant buffer device, an oxidant pretreatment device and an oxidant delivery device, the oxidant buffer device is connected to the inlet of the oxidant pretreatment device through a pipeline, and the oxidant pretreatment device The outlet of the device is connected with the inlet of the oxidant delivery device through a pipeline, and the outlet of the oxidant delivery device is connected with the inlet of the upper microchannel reaction plate.

Further, both the oxidant delivery device and the sewage delivery device are plunger type metering pumps.

Further, the sewage treatment product receiving system includes a product receiving device and an online analysis and detection device, the inlet of the product receiving device is connected to the outlet of the lower microchannel reaction plate through a pipeline, and the product receiving device is also connected to the online The analysis and detection devices are connected to each other.

Further, the microchannel coupled photocatalytic reactor also includes a button cover and a heating temperature measuring device, the button cover is buttoned on the upper microchannel reaction plate, and the ultraviolet lamp is fixedly arranged on the inner wall of the button cover; the heating The temperature measurement device is embedded in the lower microchannel reaction plate.

Further, the button cover is made of transparent acrylic material.

Further, the heating and temperature measuring device is a digital display electric heating and temperature measuring combined instrument.

Further, both the upper microchannel reaction plate and the lower microchannel reaction plate are provided with a microreaction structure, the microreaction structure is a spiral or serpentine curved channel with a characteristic size of 0.5-1mm, and the upper microchannel reaction plate The inlet of the channel reaction plate and the outlet of the lower microchannel reaction plate communicate with each other through the micro reaction structure.

Further, the material of the upper microchannel reaction plate is transparent glass, and the material of the lower microchannel reaction plate is pure titanium.

Compared with the prior art, the utility model has the following beneficial effects:

The utility model discloses a sewage treatment device based on micro-channel coupled photocatalytic reaction. By setting an oxidant delivery system, a sewage delivery system, a micro-channel coupling photocatalytic reactor and a sewage treatment product receiving system, the whole device synergistically utilizes micro The technical advantages of channel reactor, photocatalysis and ultrasonic cavitation can make the sewage and oxidant obtain a larger contact reaction specific surface area, the heat and mass transfer between materials is more sufficient, and the photocatalytic reaction can ensure that the organic matter in the sewage is effectively degraded; At the same time, installing an ultrasonic generator in the microchannel-coupled photocatalytic reactor can effectively enhance the full mixing and contact of sewage and oxidant in the microchannel structure, enhance the fluid turbulence state, enhance the flow characteristics, and effectively inhibit the adhesion of dirt on the wall. It solves the technical problem that the pretreated sewage enters the microchannel reactor and stays for a long time and easily causes channel blockage.

Further, the oxidant delivery device and the sewage delivery device used are plunger-type metering pumps, which have accurate feeding, convenient flow adjustment, wide pressure and flow ranges, and strong corrosion resistance. Under the action of stainless steel plunger metering pumps, It can achieve accurate ratio of feed and reactants, continuous and controllable reaction, low process energy consumption, high integration, and wide application range of chemical reaction.

Furthermore, the buckle cover is made of transparent acrylic material, which can conveniently and intuitively observe the sewage treatment process of the photocatalytic coupling technology in the microchannel; the upper microchannel reaction plate is made of transparent glass material, and the good light transmittance of the glass material facilitates the penetration of ultraviolet light into the Spent sewage in microchannels.

Further, a heating and temperature measuring device is installed in the microchannel coupling photocatalytic reactor, and the heating and temperature measuring device is a digital display electric heating and temperature measuring combination instrument, which can digitally display the current working temperature and working time to facilitate the operation of the work; The on-line analysis and detection device is installed in the sewage treatment product receiving system, which can comprehensively realize the on-line analysis and detection of the product, and improve the intelligent, integrated and efficient treatment capacity of sewage.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the sewage treatment device based on microchannel coupling photocatalytic reaction of the present utility model;

Fig. 2 is a schematic diagram of the internal structure of the microchannel coupled photocatalytic reactor of the present invention;

Among them: 1-sewage buffer device; 2-oxidant buffer device; 3-oxidant pretreatment device; 4-sewage pretreatment device; 5-oxidant delivery device; 6-sewage delivery device; 7-microchannel coupling light Catalytic reactor; 701-button cover; 702-ultraviolet lamp; 703-upper microchannel reaction plate; 704-heating and temperature measuring device; 705-ultrasonic generator; 706-lower microchannel reaction plate; 8-product receiving device; 9 -On-line analysis and detection device.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the utility model. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

It should be noted that the terms "first" and "second" in the specification and claims of the present utility model and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific order or sequence . It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Below in conjunction with accompanying drawing, the utility model is described in further detail:

As shown in Figure 1 and Figure 2, a sewage treatment device based on microchannel coupling photocatalytic reaction disclosed by the utility model includes an oxidant delivery system, a sewage delivery system, a microchannel coupling photocatalytic reactor 7 and a sewage treatment product receiving unit system; wherein the oxidant delivery system includes an oxidant buffer device 2, an oxidant pretreatment device 3 and an oxidant delivery device 5; the sewage delivery system includes a sewage buffer device 1, a sewage pretreatment device 4 and a sewage delivery device 6; the micro The channel coupled photocatalytic reactor 7 includes a button cover 701, an ultraviolet lamp 702, an upper microchannel reaction plate 703, a heating temperature measuring device 704, an ultrasonic generator 705 and a lower microchannel reaction plate 706; the sewage delivery system includes a product receiving device 8 and On-line analysis and detection device 9; the upper microchannel reaction plate 703 is arranged on the top of the lower microchannel reaction plate 706, and is fastened and connected by bolt-gasket-nut mode, which is convenient for disassembly and maintenance of the microchannel reactor; the ultrasonic wave The generating device 705 is fixedly arranged on the bottom of the lower microchannel reaction plate 706, the button cover 701 is arranged on the upper floor microchannel reaction plate 703, and the ultraviolet lamp 702 is fixedly arranged on the inner wall of the button cover 701; the heating and temperature measuring device 704 is embedded in the lower microchannel reaction plate 706 .

The buffered substances in the sewage buffer device 1 and the oxidant buffer device 2 respectively flow through the low-level sewage pre-treatment device 4 and the oxidant pre-treatment device 3 from the high position through the action of gravity through the pipeline, the sewage pre-treatment device 4 and the oxidant pre-treatment device 3. The outlet of the oxidant pretreatment device 3 is connected to the sewage delivery device 6 and the oxidant delivery device 5 inlets respectively, and the sewage delivery device 6 and the oxidant delivery device 5 outlets are connected to the interface of the upper microchannel reaction plate 703 respectively; The inlet of the receiving device 8 is connected to the outlet of the lower microchannel reaction plate 706 through a pipeline, and the product receiving device 8 is also connected to the on-line analysis and detection device 9 .

Turn on the ultraviolet lamp 702, the heating temperature measuring device 704 and the ultrasonic generating device 705 in turn, and the sewage and the oxidant undergo a photocatalytic reaction inside the microchannel, and the product flows into the product receiving device 8 through the pipeline from the outlet of the microchannel reaction plate 706 on the lower floor and is analyzed online The detection device 9 performs sampling detection.

Wherein, the oxidant delivery device 5 and the sewage delivery device 6 are plunger-type metering pumps, which have accurate feeding, convenient flow adjustment, wide pressure and flow ranges, and strong corrosion resistance; the upper microchannel reaction plate 703 and the lower layer The micro-reaction structure on the micro-channel reaction plate 706 is a spiral or serpentine curved channel, with a characteristic size of 0.5-1 mm; wherein, the button cover 701 is made of transparent acrylic material, which is convenient for visually observing the sewage treatment process of the photocatalytic coupling technology in the micro-channel process, the upper microchannel reaction plate 703 is made of transparent glass, and the microchannel structure is processed by laser etching. The good light transmittance of the glass material is convenient for ultraviolet light to penetrate and act on the retained sewage in the microchannel; the lower microchannel reacts The plate 706 is made of pure titanium TA2, and the microreaction structure is prepared by precision machining technology. After the processing is completed, an electrochemical anodic oxidation method is used to prepare a layer of highly ordered and high-density _TiO2 nanotube arrays on the surface of the pure titanium microstructure. A catalyst that catalyzes a reaction.

Among them, the heating temperature measuring device 704 is a digital display electric heating temperature measuring combination instrument, the heating temperature is controlled below 80°C, and the digitalization can display the current working temperature and working time; the ultrasonic generating device 705 can effectively enhance the sewage and oxidant in the microchannel structure The fully mixed contact enhances the fluid turbulent state, strengthens the flow characteristics, and effectively inhibits the adhesion of dirt on the wall.

Example 1

A paper mill bleaching wastewater was selected as the sewage feed solution. The COD content in the bleaching wastewater was 909.7mg/L, the raw water was dark brown, and the oxidant used was sodium hypochlorite. Firstly, the bleaching wastewater and sodium hypochlorite solution are respectively placed in the high-level sewage buffer device 1 and the oxidant buffer device 2, and after the valve is opened, it flows to the sewage pretreatment device 4 and the oxidant pretreatment device 3 through gravity. The main function is to remove large solid particles, impurities, grease, etc. in wastewater and oxidants, so as to avoid the risk of clogging the subsequent pump body, microchannels, pipelines, etc., turn on the stainless steel plunger metering pump, and add 5mL of the two feed liquids The flow rate of /min is pumped into the microchannel reactor at the same time, and the ultraviolet lamp 702, the digital display electric heating thermometer and the ultrasonic generating device 705 are turned on at the same time, the irradiation intensity of the glass surface is not lower than 180uw/cm ² , and the electric heating temperature is set to 60 ℃, ultrasonic frequency 20KHz, ultrasonic power 120W, the two material liquids are fully mixed inside the micro-channel coupled photocatalytic reactor 7, and start to react under photocatalysis until they are discharged from the micro-channel coupled photocatalytic reactor 7 and enter the sewage treatment product The receiving system conducts online analysis and detection of the product, the COD content in the water quality drops to 52.6mg/L, and the COD degradation rate reaches 94.2%.

The time of material mixing, that is, the residence time in the microchannel coupled photocatalytic reactor 7, can be controlled by the feed flow rate of the plunger type metering pump. The larger the flow rate, the faster the flow rate, and the shorter the uniform mixing time, The residence time is also shorter.

Example 2: The COD content in the wastewater of a pesticide production enterprise is as high as 15,000 mg/L, the raw water is purple-black, and the oxidant used is sodium hypochlorite. First, the pesticide wastewater and sodium hypochlorite solution are respectively placed in the high-level sewage buffer device 1 and the oxidant buffer device 2, and after the valve is opened, it flows to the sewage pretreatment device 4 and the oxidant pretreatment device 3 through gravity. The main function is to remove the solid and large particle impurities in the pesticide wastewater and oxidant, so as to reduce the difficulty of subsequent treatment. The flow rate of the two feed liquids is 20mL/min. Lamp 702, digital display electric heating thermometer and ultrasonic generating device 705, the glass surface radiation intensity is not less than 180uw/cm ² , the electric heating temperature is set to 80°C, the ultrasonic frequency is 30KHz, and the ultrasonic power is 150W. The inside of the microchannel reactor is fully mixed, and the reaction starts under photocatalysis until it is discharged from the microchannel reactor and enters the sewage treatment product receiving system. The product is analyzed and detected online. The COD content in the water quality is reduced to 950mg/L, and the COD degradation rate reaches up to 93.6%.

The above content is only to illustrate the technical idea of the utility model, and cannot limit the protection scope of the utility model. Any changes made on the basis of the technical solution according to the technical idea proposed by the utility model all fall into the scope of the utility model. within the scope of protection of the claims.

Claims (10)

1. A sewage treatment device based on microchannel coupling photocatalytic reaction, characterized in that, comprises oxidant delivery system, sewage delivery system, microchannel coupling photocatalytic reactor (7) and sewage treatment product receiving system; said microchannel Coupling photocatalytic reactor (7) comprises upper floor microchannel reaction plate (703), lower floor microchannel reaction plate (706), ultraviolet light (702) and ultrasonic generator (705); Described upper floor microchannel reaction plate (703) Fixedly arranged on the top of the microchannel reaction plate (706) of the lower floor, the ultraviolet lamp (702) is fixedly arranged on the top of the microchannel reaction plate (703) of the upper floor, and the ultrasonic generating device (705) is fixedly arranged on the microchannel reaction plate of the lower floor. The bottom of the plate (706); the oxidant delivery system and the sewage delivery system are respectively connected with the entrance of the upper microchannel reaction plate (703), and the sewage treatment product receiving system is connected with the outlet of the lower floor microchannel reaction plate (706). connected. 2. a kind of sewage treatment device based on microchannel coupled photocatalytic reaction according to claim 1, is characterized in that, described sewage delivery system comprises sewage cache device (1), sewage pretreatment device (4) and Sewage conveying device (6), the sewage buffer device (1) is connected to the inlet of the sewage pretreatment device (4) through a pipeline, and the outlet of the sewage pretreatment device (4) is connected to the sewage pretreatment device (4) through a pipeline The inlet of the conveying device (6) is connected, and the outlet of the sewage conveying device (6) is connected with the inlet of the upper microchannel reaction plate (703). 3. a kind of sewage treatment device based on microchannel coupled photocatalytic reaction according to claim 2, is characterized in that, described oxidant delivery system comprises oxidant cache device (2), oxidant pretreatment device (3) and An oxidant delivery device (5), the oxidant buffer device (2) is connected to the inlet of the oxidant pretreatment device (3) through a pipeline, and the outlet of the oxidant pretreatment device (3) is connected to the oxidant pretreatment device (3) through a pipeline The inlet of the delivery device (5) is connected, and the outlet of the oxidant delivery device (5) is connected with the inlet of the upper microchannel reaction plate (703). 4. The sewage treatment device based on microchannel coupled photocatalytic reaction according to claim 3, characterized in that, both the oxidant delivery device (5) and the sewage delivery device (6) are plunger type metering pumps. 5. a kind of sewage treatment device based on microchannel coupled photocatalytic reaction according to claim 1, is characterized in that, described sewage treatment product receiving system comprises product receiving device (8) and on-line analysis detection device (9), The inlet including the product receiving device (8) is connected to the outlet of the lower microchannel reaction plate (706) through a pipeline, and the product receiving device (8) is also connected to the on-line analysis and detection device (9). 6. A kind of sewage treatment device based on microchannel coupling photocatalytic reaction according to claim 1, is characterized in that, described microchannel coupling photocatalytic reactor (7) also comprises buckle cover (701) and heating temperature measurement device (704), the button cover (701) is buckled on the upper microchannel reaction plate (703), and the ultraviolet lamp (702) is fixedly arranged on the inner wall of the button cover (701); the heating temperature measuring device ( 704) is embedded in the lower microchannel reaction plate (706). 7. The sewage treatment device based on micro-channel coupling photocatalytic reaction according to claim 6, characterized in that, the button cover (701) is made of transparent acrylic material. 8 . The sewage treatment device based on micro-channel coupling photocatalytic reaction according to claim 6 , characterized in that, the heating and temperature measuring device ( 704 ) is a digital display electric heating and temperature measuring combined instrument. 9. a kind of sewage treatment device based on microchannel coupled photocatalytic reaction according to claim 1, is characterized in that, on described upper floor microchannel reaction plate (703) and lower floor microchannel reaction plate (706), all be provided with A micro-reaction structure, the micro-reaction structure is a spiral or serpentine curved channel with a characteristic size of 0.5-1 mm, the inlet of the upper microchannel reaction plate (703) and the outlet of the lower microchannel reaction plate (706) pass through The microreaction structures are interconnected. 10. a kind of sewage treatment device based on microchannel coupled photocatalytic reaction according to claim 9, is characterized in that, the material of upper strata microchannel reaction plate (703) is transparent glass, and the material of lower floor microchannel reaction plate (706) The material is pure titanium.

Images