Water treatment device

Abstract

The utility model relates to a water treatment device which comprises a raw water supply unit, an ozone preparation unit, a membrane reaction unit and an activated carbon adsorption unit, a water outlet of the raw water supply unit is communicated with a water inlet of the membrane reaction unit, the raw water supply unit is used for providing raw water for the membrane reaction unit, and the membrane reaction unit is used for treating the raw water. The ozone preparation unit is connected with the bottom of the membrane reaction unit and used for supplying ozone to the membrane reaction unit, and a water outlet of the membrane reaction unit is communicated with an inlet of the activated carbon adsorption unit. By supplying ozone to the membrane reaction unit, the ozone not only oxidizes and degrades organic matters, but also completely / partially mineralizes and degrades or converts macromolecular and hydrophobic organic matters which cause membrane pollution problems into micromolecules and hydrophilic substances which are not easy to cause membrane pollution, so that the purpose of effectively relieving membrane pollution is achieved. Meanwhile, hydrophilic modification on the membrane is not needed, the stability is good, and the cost is relatively low.

Description

Technical Field

[0001] The present application relates to the technical field of micro-polluted raw water treatment, and in particular to a water treatment device. Background Art

[0002] Drinking water quality safety is an important guarantee for people's health. However, due to the influence of industrial and domestic wastewater discharged into natural water bodies, pollution problems in some drinking water sources are still common. The pollutants in micro-polluted water sources are numerous and complex, and the low-content pollutants are difficult to effectively remove through conventional water treatment processes, which will directly affect the quality of residents' drinking water. Therefore, the use of new technologies to improve the quality of drinking water while ensuring the stability of the effluent water quality has always been the most important development goal of water treatment technology.

[0003] Due to its efficient separation performance and reliable effluent quality, the membrane separation system can provide high-quality drinking water economically and continuously, and is becoming an increasingly important alternative method for treating surface water and groundwater. In the development of membrane separation technology, PVDF is the most widely used membrane material because it has good acid and alkali resistance, oxidation resistance, film forming properties and mechanical strength, which makes the hydrophobic PVDF membrane have the advantages of strong oxidation resistance, high particle retention rate and high membrane flux recovery rate after backwashing.

[0004] However, membrane fouling remains a bottleneck for large-scale application of hydrophobic PVDF membrane technology. During the water treatment process, pollutants (especially organic matter such as proteins) are easily adsorbed on the surface and membrane pores of the hydrophobic PVDF membrane, resulting in a decrease in the water flux of the membrane or an increase in the operating pressure. Frequent cleaning will increase operating costs and shorten the service life of the membrane. Utility Model Content

[0005] Based on this, it is necessary to provide a water treatment device to address the membrane fouling problem.

[0006] A water treatment device comprises a raw water supply unit, an ozone preparation unit, a membrane reaction unit and an activated carbon adsorption unit, wherein the water outlet of the raw water supply unit is connected to the water inlet of the membrane reaction unit, the raw water supply unit is used to provide raw water to the membrane reaction unit, the membrane reaction unit is used to treat the raw water, the ozone preparation unit is connected to the membrane reaction unit and is used to supply ozone to the membrane reaction unit, and the water outlet of the membrane reaction unit is connected to the inlet of the activated carbon adsorption unit.

[0007] In one of the embodiments, the membrane reaction unit includes a shell, a detachable PVDF fiber membrane assembly arranged in the shell, and an aerator arranged at the bottom of the shell, the air outlet of the ozone preparation unit is connected to the air inlet of the aerator, and the ozone in the ozone preparation unit is released into the raw water in the shell through the aerator.

[0008] In one of the embodiments, two oppositely disposed limiting slide grooves are disposed in the shell, and the two sides of the PVDF fiber membrane assembly along the length direction are respectively disposed in the corresponding limiting slide grooves.

[0009] In one of the embodiments, the aerators are respectively provided on both sides of the PVDF fiber membrane assembly along the thickness direction, and the aerators extend along the length direction of the PVDF fiber membrane assembly.

[0010] In one embodiment, the water treatment device includes a pressure monitoring unit, which includes a pressure sensor. The pressure sensor is arranged on the connecting pipeline between the membrane reaction unit and the activated carbon adsorption unit, and is used to detect the transmembrane pressure difference of the PVDF fiber membrane assembly after ozone oxidation.

[0011] In one embodiment, the activated carbon adsorption unit includes a biological activated carbon column, which includes a support frame and a carbon column body, the support frame includes at least a first layer of support body and a second layer of support body, a closed cavity is formed between the first layer of support body and the second layer of support body, the carbon column body is arranged on the first layer of support body, and the bottom is connected to the closed cavity, the closed cavity is provided with a water inlet of the biological activated carbon column, and the top of the carbon column body is provided with a water outlet of the biological activated carbon column.

[0012] In one of the embodiments, the activated carbon adsorption unit includes an aeration head, which is disposed in the closed cavity, and an aeration port of the aeration head passes through the second layer of support body and communicates with the outside.

[0013] In one of the embodiments, the top of the shell is an open structure, and an overflow port is provided on the side wall of the shell near the top, and the overflow port is connected to the return water port of the raw water supply unit.

[0014] In one of the embodiments, the raw water supply unit is connected to the top of the shell, and a water outlet pipe is provided on the top of the PVDF fiber membrane assembly, and the water outlet pipe is connected to the activated carbon adsorption unit.

[0015] In one embodiment, the ozone preparation unit includes an oxygen pump, a gas flow meter and an ozone generator connected in sequence through pipelines, the oxygen pump is used to provide air, the gas flow meter is used to monitor and control the ozone flow delivered to the membrane reaction unit, the ozone generator is used to prepare the air delivered by the oxygen pump into ozone of a preset concentration, and the ozone generator is connected to the bottom of the membrane reaction unit.

[0016] The above water treatment device supplies ozone to the membrane reaction unit. Ozone not only oxidizes and degrades organic matter, but also completely / partially mineralizes and degrades macromolecules and hydrophobic organic matter that cause membrane pollution or converts them into small molecules and hydrophilic substances that are not easy to cause membrane pollution, thereby achieving the purpose of effectively alleviating membrane pollution. At the same time, there is no need to modify the membrane to be hydrophilic, the stability is good, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a schematic structural diagram of a water treatment device in one embodiment.

[0018] FIG. 2 is a schematic diagram of the structure of a membrane reaction unit in one embodiment.

[0019] FIG3 is a schematic diagram of the structure of a biological activated carbon column in one embodiment.

[0020] Reference numerals: 100, raw water supply unit; 110, water inlet bucket; 120, first peristaltic pump; 200, ozone preparation unit; 210, oxygen pump; 220, gas flow meter; 230, ozone generator; 300, membrane reaction unit; 310, shell; 311, overflow port; 312, water inlet; 313, water outlet; 315, drain port; 316, sampling port; 317, air inlet; 320, PVDF fiber membrane assembly; 3 30. Aerator; 400. Activated carbon adsorption unit; 410. Biological activated carbon column; 412. Carbon column body; 413. Water inlet of biological activated carbon column; 414. Water outlet of biological activated carbon column; 420. Support frame; 421. First layer support body; 422. Second layer support body; 430. Aeration head; 431. Aeration port; 440. Second peristaltic pump; 450. Water outlet bucket; 510. Pressure sensor; 520. Paperless recorder. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0022] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0023] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0025] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0027] In the related technology, PVDF membrane is generally modified to be hydrophilic to improve the anti-pollution performance of the membrane. However, the hydrophilic modification method has the problems of complex modification process steps, high cost, poor stability of membrane hydrophilicity, and the oxidation resistance of PVDF membrane is reduced after hydrophilic modification. Therefore, it is of great significance to develop a hydrophobic membrane coupling process that has the characteristics of good treatment effect of micro-polluted raw water, low energy consumption, and light membrane pollution.

[0028] Referring to Figure 1, an embodiment of the present application provides a water treatment device, which includes a raw water supply unit 100, an ozone preparation unit 200, a membrane reaction unit 300 and an activated carbon adsorption unit 400. The water outlet of the raw water supply unit 100 is connected to the water inlet 312 of the membrane reaction unit 300. The raw water supply unit 100 is used to provide raw water to the membrane reaction unit 300, and the membrane reaction unit 300 is used to treat the raw water. The ozone preparation unit 200 is connected to the membrane reaction unit 300 for supplying ozone to the membrane reaction unit 300. The water outlet of the membrane reaction unit 300 is connected to the inlet of the activated carbon adsorption unit 400.

[0029] In this embodiment, by supplying ozone to the membrane reaction unit 300, ozone not only oxidizes and degrades organic matter, but also completely / partially mineralizes and degrades or converts macromolecules and hydrophobic organic matter that cause membrane pollution into small molecules and hydrophilic substances that are not easy to cause membrane pollution, thereby achieving the purpose of effectively alleviating membrane pollution. At the same time, there is no need to modify the membrane to be hydrophilic, the stability is good, and the cost is low.

[0030] In addition, the primary filtered water after being treated by the membrane reaction unit 300 can flow into the activated carbon adsorption unit 400. The activated carbon in the activated carbon adsorption unit 400 adsorbs and degrades pollutants such as small molecular organic matter in the filtered water, further improving the quality of the effluent water and making the effluent water meet the quality standards of drinking water. Moreover, the activated carbon can adsorb some toxic and harmful disinfection byproducts that may be caused by ozone oxidation, further ensuring the safety of drinking water quality.

[0031] Furthermore, the membrane reaction unit 300 coupled with ozone is used as a pretreatment process of the activated carbon adsorption unit 400, which effectively alleviates the workload of the activated carbon adsorption unit 400, reduces the cleaning frequency and replacement times of the activated carbon adsorption unit 400, and reduces the operating cost.

[0032] Among them, the raw water supply unit 100 includes a water inlet barrel 110 and a first peristaltic pump 120 connected to the water inlet barrel 110, that is, the first peristaltic pump 120 is used to transport the raw water in the water inlet barrel 110 to the water inlet 312 of the membrane reaction unit 300, wherein the flow rate of the raw water can be adjusted by the first peristaltic pump 120 to ensure that the slightly polluted raw water is stably and continuously delivered to the membrane reaction unit 300.

[0033] In some embodiments, the membrane reaction unit 300 includes a housing 310, a PVDF fiber membrane assembly 320 detachably disposed in the housing 310, and an aerator 330 disposed at the bottom of the housing 310. The air outlet of the ozone production unit 200 is connected to the air inlet of the aerator 330, and the ozone in the ozone production unit 200 is released into the raw water in the housing 310 through the aerator 330. The PVDF fiber membrane assembly 320 includes a hydrophobic PVDF hollow fiber membrane.

[0034] In this embodiment, the first peristaltic pump 120 is started, and the first peristaltic pump 120 delivers raw water to the membrane reaction unit 300 through the pipeline, and the ozone preparation unit 200 is started, and a certain concentration of ozone enters the membrane reaction unit 300 evenly through the aerator 330, and the ozone reacts chemically with the raw water to perform preliminary treatment on it. Among them, the ozone enters the membrane reaction unit 300 through the aerator 330, and the ozone is converted into a large number of uniform and fine bubbles through the aerator 330 and then released into the raw water in the shell 310, and aeration is used to enhance the mass transfer efficiency of ozone from the gas phase to the liquid phase, improve the utilization rate of ozone, and then more effectively alleviate the membrane pollution problem of the hydrophobic membrane.

[0035] In some embodiments, two oppositely disposed limiting slide grooves (not shown) are disposed in the housing 310 , and the PVDF fiber membrane assembly 320 is disposed in the corresponding limiting slide grooves on both sides along the length direction.

[0036] The height of the limiting chute is the same as the height of the PVDF fiber membrane assembly 320. When the PVDF fiber membrane assembly 320 needs to be installed, it is only necessary to embed the two sides of the bottom of the PVDF fiber membrane assembly 320 into the two limiting chute respectively, and then slide the PVDF fiber membrane assembly 320 downward along the limiting chute. When the PVDF fiber membrane assembly 320 needs to be disassembled, the PVDF fiber membrane assembly 320 is directly taken out along the height direction. The limiting chute is used to limit the position of the PVDF fiber membrane assembly 320 to ensure that the PVDF fiber membrane assembly 320 does not shift, thereby achieving a more stable operation of the PVDF fiber membrane assembly 320. This ensures that the ozone microbubbles generated by the aerator 330 can function more stably and accurately on the membrane surface.

[0037] In some embodiments, referring to FIG. 1 and FIG. 2 , aerators 330 are respectively disposed on both sides of the PVDF fiber membrane assembly 320 along the thickness direction, and the aerators 330 extend along the length direction of the PVDF fiber membrane assembly 320 .

[0038] Among them, the aerator 330 can be an air disc stone, specifically a low-pressure refined air disc stone. Ozone is converted into ozone bubbles through two low-pressure refined air disc stones and enters into the shell 310, and aeration of slightly polluted raw water is achieved on both sides of the PVDF fiber membrane assembly 320, thereby promoting the mineralization of pollutants, performing preliminary treatment on the raw water, and alleviating the membrane pollution on the surface of the PVDF fiber membrane assembly 320.

[0039] There are two aerators 330, which are symmetrically distributed on both sides of the PVDF fiber membrane module 320. The aerators 330 extend along the length direction of the PVDF fiber membrane module 320, so that the aerators 330 are in a long strip structure, ensuring that the ozone microbubbles delivered to the inside of the PVDF fiber membrane module 320 are more uniform and cover a wider area, thereby improving the treatment effect.

[0040] In some embodiments, the water treatment device includes a pressure monitoring unit, which includes a pressure sensor 510. The pressure sensor 510 is arranged on the connecting pipeline between the membrane reaction unit 300 and the activated carbon adsorption unit 400, and is used to detect the transmembrane pressure difference of the PVDF fiber membrane assembly 320 after ozone oxidation.

[0041] Among them, a water outlet pipe 313 is set at the top of the PVDF fiber membrane component 320. The water outlet pipe 313 is first connected to the pressure sensor 510 through a pipeline. The pressure sensor 510 is connected to the paperless recorder 520. The paperless recorder 520 is used to monitor and record the pressure changes in the membrane reaction unit 300 in real time during the operation, and then preliminarily understand the operation and contamination conditions of the PVDF fiber membrane component 320, so as to make reasonable adjustments to the experimental conditions in time. The pressure sensor 510 is then connected to the activated carbon adsorption unit 400 through a pipeline.

[0042] In some embodiments, in combination with Figure 3, the activated carbon adsorption unit 400 includes a biological activated carbon column 410, the biological activated carbon column 410 includes a support frame 420 and a carbon column body 412, the support frame 420 includes at least a first layer support body 421 and a second layer support body 422, a closed cavity is formed between the first layer support body 421 and the second layer support body 422, the carbon column body 412 is arranged on the first layer support body 421, and the bottom is connected to the closed cavity, a water inlet 413 of the biological activated carbon column is opened on the closed cavity, and a water outlet 414 of the biological activated carbon column is opened on the top of the carbon column body 412.

[0043] The support frame 420 is used to support the biological activated carbon column 410 , and the support frame 420 also includes support feet arranged at the bottom of the second layer support body 422 .

[0044] In some embodiments, the activated carbon adsorption unit 400 includes an aeration head 430 , which is disposed in a closed cavity, and an aeration port 431 of the aeration head 430 passes through the second layer support body 422 and communicates with the outside.

[0045] In this embodiment, the aeration port 431 is connected to a pump for performing air-water backwashing on the activated carbon in the carbon column body 412 to quickly clean the activated carbon.

[0046] In some embodiments, the top of the shell 310 is an open structure, and an overflow port 311 is provided on the side wall of the shell 310 near the top. The overflow port 311 is connected to the water return port of the raw water supply unit 100 .

[0047] In this embodiment, the overflow port 311 can be opened to discharge the excess raw water in the membrane reactor to prevent the excessive amount of micro-polluted raw water in the membrane reactor from affecting the normal operation of the device. The top of the housing 310 is open to facilitate cleaning of the PVDF fiber membrane assembly 320.

[0048] Furthermore, the shell 310 is made of organic glass and is transparent and visible, so that the water level changes inside the shell 310 and the contamination of the surface of the PVDF fiber membrane assembly 320 can be observed intuitively in real time.

[0049] In some embodiments, the raw water supply unit 100 is connected to the water inlet 312 at the top of the housing 310 through a pipeline, wherein the water inlet 312 is an open structure because the top of the housing 310 is an open structure. A water outlet pipe 313 is provided at the top of the PVDF fiber membrane module 320, and the water outlet pipe 313 extends out of the water inlet 312 and is connected to the activated carbon adsorption unit 400.

[0050] In some embodiments, the housing 310 is further provided with a sampling port 316 and an emptying port 315, wherein the emptying port 315 is used to empty the raw water in the membrane reaction unit 300 when cleaning the membrane reaction unit 300. The sampling port 316 is used to obtain water samples after ozone oxidation, and is used to detect relevant indicators, so as to facilitate comparison with the water quality of the effluent of the ozone-coupled membrane module and the effluent of the ozone-coupled membrane module / bioactivated carbon.

[0051] Specifically, a PVDF fiber membrane assembly 320 is fixedly connected to the center of the housing 310, wherein the effective volume of the PVDF fiber membrane assembly 320 is 20.7 L, the pore size of the PVDF fiber membrane assembly 320 is 0.04nm-0.1nm, and the effective filtration area of ​​a single membrane fiber is 0.0018m 2 The water flow rate is 10.8 L / h, the ozone concentration entering the PVDF fiber membrane component 320 is 2.84 mg / L, and the gas flow rate is 0.4 L / min.

[0052] In some embodiments, the ozone preparation unit 200 includes an oxygen pump 210, a gas flow meter 220 and an ozone generator 230 connected in sequence by pipelines. The oxygen pump 210 is used to provide air, the gas flow meter 220 is used to monitor and control the ozone flow delivered to the membrane reaction unit 300, and the ozone generator 230 is used to prepare the air delivered by the oxygen pump 210 into ozone of a preset concentration. The ozone generator 230 is connected to the bottom of the membrane reaction unit 300.

[0053] Before use, open the overflow port 311 and the air inlet 317, close the emptying port 315 and the sampling port 316, ensure that the overflow port 311 is connected to the return port of the water inlet bucket 110 and the water is discharged normally, one end of the air inlet 317 is well connected to the air outlet of the ozone generator 230, and the other end is connected to the aerator 330. When in use, turn on the first peristaltic pump 120, and the slightly polluted raw water in the water inlet bucket 110 is continuously pumped into the housing 310 at a flow rate of 12.5 mL / min; then start the oxygen pump 210 and the ozone generator 230 at the same time, and the ozone generator 230 converts the air pumped into ozone by the oxygen pump 210, and then the ozone with a concentration of 2.84 mg / L and a gas flow rate of 0.4 L / min is converted into ozone bubbles through the two aerators 330 and enters the housing 310, so as to achieve aeration of the slightly polluted raw water, promote the mineralization of pollutants, perform preliminary treatment on the raw water, and alleviate the membrane pollution. Next, the second peristaltic pump 440 is turned on. Under the action of external force, the filtrate after ozone oxidation and filtration by the PVDF fiber membrane assembly 320 is sent to the biological activated carbon column 410 through the pressure sensor 510. The ozone and membrane filtered water are further processed by adsorption and biodegradation to improve the effluent quality and effectively reduce the cleaning frequency of the biological activated carbon. Finally, it is discharged into the water outlet bucket 450 through the water outlet 414 of the biological activated carbon column.

[0054] When the water treatment device of the present application is actually used, the ozone preparation unit 200 is started, and the generated ozone enters the membrane reaction unit 300 through the gas pipeline. The ozone fully oxidizes the organic pollutants in the raw water, and the oxidized pollutants are converted into small molecules and hydrophilic substances. Then, the filtering effect of the PVDF fiber membrane component 320 is utilized to intercept inorganic matter, organic matter and microorganisms in the water. Subsequently, the filtrate of the PVDF fiber membrane component 320 enters the biological activated carbon column 410 to further adsorb and biodegrade the residual pollutants in the water.

[0055] The water treatment device of the present application was compared with membrane filtration alone, and the ozone concentration was adjusted to 2.84 mg / L, the ozone inlet flow rate was 0.4 L / min, the residence time was 83 min, and the operation was 50 days. The comparison results are shown in Table 1.

[0056]

[0057] Table 1

[0058] The cleaning frequency refers to the cleaning frequency of the hydrophobic PVDF hollow fiber membrane assembly within 50 days of operation of the reaction device.

[0059] It can be seen that the present application has stable operation, significant membrane pollution control effect, and reduced processing costs.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A water treatment device, characterized in that: The water treatment device includes a raw water supply unit, an ozone preparation unit, a membrane reaction unit and an activated carbon adsorption unit. The water outlet of the raw water supply unit is connected to the water inlet of the membrane reaction unit. The raw water supply unit is used to provide raw water to the membrane reaction unit. The membrane reaction unit is used to treat the raw water. The ozone preparation unit is connected to the membrane reaction unit and is used to supply ozone to the membrane reaction unit. The water outlet of the membrane reaction unit is connected to the inlet of the activated carbon adsorption unit.

2. The water treatment device according to claim 1, characterized in that: The membrane reaction unit includes a shell, a detachable PVDF fiber membrane assembly arranged in the shell, and an aerator arranged at the bottom of the shell. The air outlet of the ozone preparation unit is connected to the air inlet of the aerator, and the ozone in the ozone preparation unit is released into the raw water in the shell through the aerator.

3. The water treatment device according to claim 2, characterized in that: Two oppositely disposed limiting slide grooves are arranged in the shell, and the two sides of the PVDF fiber membrane assembly along the length direction are respectively arranged in the corresponding limiting slide grooves.

4. The water treatment device according to claim 2, characterized in that: The aerators are respectively arranged on both sides of the PVDF fiber membrane assembly along the thickness direction, and the aerators extend along the length direction of the PVDF fiber membrane assembly.

5. The water treatment device according to claim 1, characterized in that: The water treatment device includes a pressure monitoring unit, which includes a pressure sensor. The pressure sensor is arranged on the connecting pipeline between the membrane reaction unit and the activated carbon adsorption unit, and is used to detect the transmembrane pressure difference of the PVDF fiber membrane assembly after ozone oxidation.

6. The water treatment device according to claim 1, characterized in that: The activated carbon adsorption unit includes a biological activated carbon column, which includes a support frame and a carbon column body. The support frame includes at least a first layer of support body and a second layer of support body, a closed cavity is formed between the first layer of support body and the second layer of support body, the carbon column body is arranged on the first layer of support body, and the bottom is connected to the closed cavity, the closed cavity is provided with a water inlet of the biological activated carbon column, and the top of the carbon column body is provided with a water outlet of the biological activated carbon column.

7. The water treatment device according to claim 6, characterized in that: The activated carbon adsorption unit comprises an aeration head, which is arranged in the closed cavity, and an aeration port of the aeration head passes through the second layer of support body and is in communication with the outside.

8. The water treatment device according to claim 2, characterized in that: The top of the shell is an open structure, and an overflow port is provided on the side wall of the shell near the top, and the overflow port is connected to the water return port of the raw water supply unit.

9. The water treatment device according to claim 8, characterized in that: The raw water supply unit is connected to the top of the shell, and a water outlet pipe is provided on the top of the PVDF fiber membrane module, and the water outlet pipe is connected to the activated carbon adsorption unit.

10. The water treatment device according to claim 1, characterized in that: The ozone preparation unit includes an oxygen pump, a gas flow meter and an ozone generator which are connected in sequence through pipelines. The oxygen pump is used to provide air, the gas flow meter is used to monitor and control the ozone flow delivered to the membrane reaction unit, and the ozone generator is used to prepare the air delivered by the oxygen pump into ozone of a preset concentration. The ozone generator is connected to the bottom of the membrane reaction unit.

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