Sewage treatment plant

Abstract

The present invention relates to the technical field of sewage treatment, and provides a sewage treatment device. The present invention provides a sewage treatment device, comprising a sewage holding unit, a membrane separation unit, a photocatalytic treatment unit, a photocatalyst recovery unit and a target liquid recovery unit; the sewage holding unit has a sewage holding chamber and a sewage outlet that can be connected to the sewage holding chamber; the membrane separation unit has a membrane separation treatment inlet and a membrane separation treatment outlet; the membrane separation treatment inlet is connected to the sewage outlet; the photocatalytic treatment unit has a reaction chamber, a photocatalytic treatment inlet and a target liquid discharge outlet; a photocatalyst is arranged in the reaction chamber; the membrane separation treatment outlet is connected to the target liquid discharge outlet through the photocatalytic treatment inlet and the reaction chamber in sequence; the target liquid recovery unit has a target liquid holding chamber and a target liquid collecting port; the target liquid discharge port is connected to the target liquid holding chamber through the target liquid collecting port; the photocatalyst recovery unit is arranged on the photocatalytic treatment unit, and can recover the photocatalyst from the sewage in the reaction chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment device. Background Art

[0002] Membrane separation technology is a technology that uses the selective permeation of membranes to separate, grade, purify and concentrate the components in a mixture. This technology has the advantages of small footprint, simple operation and high treatment efficiency, so it is widely used in the field of sewage treatment. Since membrane separation technology will not have adverse effects on the components of the treatment object, when the treatment object contains trace pollutants such as antibiotics, antibiotic contamination may remain in the permeate or concentrate during the membrane separation process. Therefore, it is urgent to add technology for removing antibiotics in the membrane separation process.

[0003] Photocatalytic technology, as an advanced oxidation method, can effectively degrade and remove trace pollutants such as antibiotics in sewage. Combining membrane separation technology with photocatalytic technology has formed a new process that can not only remove conventional pollutants (such as carbon, nitrogen, and phosphorus) in sewage, but also effectively remove trace pollutants (such as antibiotics), thereby improving the treatment effect of sewage.

[0004] However, existing photocatalytic treatment units usually consist of an excitation light source and a photocatalyst. After the sewage is treated by membrane separation, large particles can be removed, which helps to improve the effect of subsequent photocatalytic reactions. At the same time, the photocatalytic effect is affected by the morphology of the photocatalyst. The specific surface area of ​​the powdered photocatalyst is much larger than that of the photocatalyst in the fixed reactor, and because it is always in a suspended state, it can significantly improve the mass transfer efficiency. Therefore, the suspended powdered photocatalyst shows a higher effect in the photocatalytic reaction.

[0005] However, the suspended photocatalyst faces the problem of difficult recycling in the actual treatment process, which has not been effectively solved. Therefore, it is still necessary to develop a new device that can overcome the recycling problem in the existing technology and improve the antibiotic removal efficiency. Summary of the invention

[0006] The invention provides a sewage treatment device for solving the technical problem of recycling suspended photocatalyst in the prior art.

[0007] The present invention provides a sewage treatment device, comprising a sewage holding unit, a membrane separation unit, a photocatalytic treatment unit, a photocatalyst recovery unit and a target liquid recovery unit; the sewage holding unit has a sewage holding chamber and a sewage outlet that can be connected to the sewage holding chamber; the membrane separation unit has a membrane separation treatment inlet and a membrane separation treatment outlet; the membrane separation treatment inlet is connected to the sewage outlet; the photocatalytic treatment unit has a reaction chamber, a photocatalytic treatment inlet and a target liquid discharge outlet; a photocatalyst is arranged in the reaction chamber; the membrane separation treatment outlet is connected to the target liquid discharge outlet through the photocatalytic treatment inlet and the reaction chamber in sequence; the target liquid recovery unit has a target liquid holding chamber and a target liquid collecting port; the target liquid discharge port is connected to the target liquid holding chamber through the target liquid collecting port; the photocatalyst recovery unit is arranged on the photocatalytic treatment unit, and can recover the photocatalyst from the sewage in the reaction chamber.

[0008] According to one embodiment of the present invention, the photocatalytic treatment unit includes a reaction container and a filter; the reaction container has a reaction chamber, the photocatalytic treatment inlet and the target liquid outlet, and the target liquid outlet is located at the top of the reaction container; the filter is located in the top of the reaction container, the outer peripheral edge of the filter is connected to the inner wall of the reaction container, and the pore size of the filter is smaller than the particle size of the photocatalyst.

[0009] According to one embodiment of the present invention, the photocatalytic treatment unit also includes a centrifugal mechanism and an excitation light source; the centrifugal mechanism is arranged in the reaction chamber, and can rotate in the reaction container to drive the sewage in the reaction chamber to move, so that the sewage contacts the filter, and under the action of the sewage, the photocatalyst contacts the excitation light source, and the rotation axis of the centrifugal mechanism is parallel to the height direction of the reaction container; the excitation light source is arranged in the reaction chamber.

[0010] According to one embodiment of the present invention, the side wall of the reaction container has a photocatalyst discharge port that can communicate with the reaction chamber; the photocatalyst recovery unit is located outside the reaction container and is arranged at the photocatalyst discharge port.

[0011] According to one embodiment of the present invention, the photocatalyst recovery unit includes a recovery shell and a guide plate; the recovery shell is arranged on the side wall of the reaction container, and has a recovery chamber and a photocatalyst inlet that can be connected to the recovery chamber; the photocatalyst inlet is located on the side wall of the recovery shell and is connected to the photocatalyst discharge port; the guide plate is located in the recovery chamber, the end of the guide plate is connected to the lower edge of the photocatalyst inlet, the guide plate is arranged to be inclined upward along the radial outward direction of the reaction container, and the guide plate can divide the recovery chamber into a first sub-chamber and a second sub-chamber, the first sub-chamber is located in the second Above the sub-chamber, the guide plate has a first end and a second end that are relatively arranged along a direction perpendicular to the inclination direction thereof, and the first end and the second end are respectively connected to the side wall of the recovery chamber; a recovery shell inlet is formed between the free end of the guide plate and the side wall of the recovery chamber; the first sub-chamber is connected to the second sub-chamber through the recovery shell inlet; wherein, when the height of the sewage in the reaction chamber is located at the photocatalyst discharge port, the centrifugal mechanism can rotate to make the photocatalyst in the reaction chamber flow into the second sub-chamber in sequence through the photocatalyst discharge port, the first sub-chamber and the recovery shell inlet.

[0012] According to one embodiment of the present invention, it also includes a photocatalyst discharge mechanism, which is arranged at the photocatalyst discharge port and can open the photocatalyst discharge port when the rotation speed of the centrifugal mechanism is higher than a preset value, or close the photocatalyst discharge port when the rotation speed of the centrifugal mechanism is lower than a preset value.

[0013] According to one embodiment of the present invention, the photocatalyst discharge mechanism includes a linear motion mechanism and a photocatalyst discharge door; the linear motion mechanism is arranged on the reaction container and connected to the photocatalyst discharge door, and can drive the photocatalyst discharge door to reciprocate linearly to open the photocatalyst discharge port when the rotation speed of the centrifugal mechanism is higher than a preset value, or to close the photocatalyst discharge port when the rotation speed of the centrifugal mechanism is lower than a preset value; the sewage treatment device also includes a controller, which is electrically connected to the linear motion mechanism and the centrifugal mechanism.

[0014] According to one embodiment of the present invention, the recovery shell further has a discharge hole, which is located at the bottom of the recovery shell and communicates with the second sub-chamber.

[0015] According to one embodiment of the present invention, a control valve is further included, and the control valve is disposed at the discharge hole.

[0016] According to one embodiment of the present invention, it also includes a photocatalyst receiving unit, which has a photocatalyst receiving chamber and a photocatalyst recovery inlet that can be connected to the photocatalyst receiving chamber; the photocatalyst recovery inlet is connected to the discharge hole.

[0017] The characteristics and advantages of the sewage treatment device of the present invention are:

[0018] By combining membrane separation technology with photocatalytic technology, the problem of suspended photocatalyst recovery in the prior art is effectively solved, and the removal efficiency of trace pollutants such as antibiotics is improved. The working principle of the device is that the sewage to be treated is first contained by the sewage containing unit and transported to the membrane separation unit through the sewage outlet. In the membrane separation unit, the sewage is filtered by the membrane to remove larger particles, ensuring that the suspended photocatalyst can be treated more efficiently in the subsequent photocatalytic reaction. The sewage after membrane separation enters the reaction chamber of the photocatalytic treatment unit, and a photocatalyst is added to the reaction chamber. The photocatalyst is excited by an excitation light source to degrade the pollutants in the sewage. After the photocatalytic reaction, trace pollutants such as antibiotics in the sewage can be effectively degraded and removed. The water flow through the reaction chamber enters the target liquid recovery unit, and the treated target liquid is collected through the target liquid collection port. At the same time, the photocatalyst recovery unit is located on the photocatalytic treatment unit, and the suspended photocatalyst in the reaction chamber is recovered from the sewage through the photocatalyst recovery unit. The sewage treatment device combines membrane separation and photocatalytic technology to improve sewage treatment efficiency and solve the problem of difficulty in recycling suspended photocatalysts, allowing photocatalysts to be recycled efficiently, reducing the concentration of pollutants and effectively removing trace pollutants such as antibiotics. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a front view of the sewage treatment device of the present invention;

[0021] Figure 2 is a stereoscopic diagram of the sewage treatment device of the present invention;

[0022] Figure 3 is another stereoscopic view of the sewage treatment device of the present invention;

[0023] Figure 4 is a top view of the sewage treatment device of the present invention;

[0024] Figure 5 yes Figure 4 A cross-sectional view of a state along the AA direction;

[0025] Figure 6 yes Figure 4 A cross-sectional view of another state along the AA direction;

[0026] Figure 7 is a three-dimensional diagram of a photocatalyst recovery unit of the present invention;

[0027] Figure 8 yes Figure 5 Enlarged view of part A in the middle.

[0028] Reference numerals:

[0029] 1. Sewage containing unit; 11. Sewage containing chamber; 12. Sewage outlet; 2. Membrane separation unit; 21. Membrane separation treatment inlet; 22. Membrane separation treatment outlet; 3. Photocatalytic treatment unit; 31. Reaction vessel; 311. Reaction chamber; 312. Photocatalytic treatment inlet; 313. Target liquid discharge outlet; 314. Photocatalyst discharge outlet; 32. Filter; 33. Centrifugal mechanism; 4. Photocatalyst recovery unit; 41. Recovery shell; 411. Recovery chamber; 4101. First sub-chamber; 4102. Second sub-chamber; 412. Photocatalyst inlet; 413. Discharge hole; 42. Guide plate; 40. Recovery shell inlet; 5. Target liquid recovery unit; 50. Target liquid containing chamber; 6. Photocatalyst discharge mechanism; 61. Linear motion mechanism; 62. Photocatalyst discharge door; 7. Photocatalyst receiving unit; 71. Photocatalyst receiving chamber; 72. Photocatalyst recovery inlet; H. Height direction of reaction vessel. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present embodiment, it should be understood that 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present embodiment.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this embodiment, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this embodiment, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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 those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0034] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or 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.

[0035] Figures 1 to 8 The sewage treatment device provided by the present invention is shown. As can be seen from the figure, the present invention provides a sewage treatment device, including a sewage holding unit 1, a membrane separation unit 2, a photocatalytic treatment unit 3, a photocatalyst recovery unit 4 and a target liquid recovery unit 5; the sewage holding unit 1 has a sewage holding chamber 11 and a sewage outlet 12 that can be connected to the sewage holding chamber 11; the membrane separation unit 2 has a membrane separation treatment inlet 21 and a membrane separation treatment outlet 22; the membrane separation treatment inlet 21 is connected to the sewage outlet 12; the photocatalytic treatment unit 3 has a reaction chamber 311, a photocatalytic treatment inlet 312 and a target liquid discharge outlet 313; a photocatalyst is arranged in the reaction chamber 311; the membrane separation treatment outlet 22 is connected to the target liquid discharge outlet 313 through the photocatalytic treatment inlet 312 and the reaction chamber 311 in sequence; the target liquid recovery unit 5 has a target liquid holding chamber 50 and a target liquid collecting port; the target liquid discharge outlet 313 is connected to the target liquid holding chamber 50 through the target liquid collecting port; the photocatalyst recovery unit 4 is arranged on the photocatalytic treatment unit 3, and can recover the photocatalyst from the sewage in the reaction chamber 311.

[0036] In specific implementation, by combining membrane separation technology with photocatalytic technology, the problem of suspended photocatalyst recovery in the prior art is effectively solved, and the removal efficiency of trace pollutants such as antibiotics is improved. The working principle of the device is that the sewage to be treated is first accommodated by the sewage holding unit 1, and transported to the membrane separation unit 2 through the sewage outlet 12. In the membrane separation unit 2, the sewage is filtered by the membrane to remove larger particles, ensuring that the suspended photocatalyst in the subsequent photocatalytic reaction can be treated more efficiently. The sewage after membrane separation enters the reaction chamber 311 of the photocatalytic treatment unit 3, and a photocatalyst is added to the reaction chamber 311. The photocatalyst is excited by the excitation light source to degrade the pollutants in the sewage. After the photocatalytic reaction, trace pollutants such as antibiotics in the sewage can be effectively degraded and removed. The water flow passing through the reaction chamber 311 enters the target liquid recovery unit 5, and the treated target liquid is collected through the target liquid collection port. At the same time, the photocatalyst recovery unit 4 is located on the photocatalytic treatment unit 3, and the suspended photocatalyst in the reaction chamber 311 is recovered from the sewage by the photocatalyst recovery unit 4. The sewage treatment device combines membrane separation and photocatalytic technology to improve sewage treatment efficiency and solve the problem of difficulty in recycling suspended photocatalysts, allowing photocatalysts to be recycled efficiently, reducing the concentration of pollutants and effectively removing trace pollutants such as antibiotics.

[0037] In this embodiment, the sewage may be biogas slurry.

[0038] According to one embodiment of the present invention, the photocatalytic treatment unit 3 includes a reaction container 31 and a filter 32; the reaction container 31 has a reaction chamber 311, a photocatalytic treatment inlet 312 and a target liquid outlet 313, and the target liquid outlet 313 is located at the top of the reaction container 31; the filter 32 is located in the top of the reaction container 31, and the outer peripheral edge of the filter 32 is connected to the inner peripheral wall of the reaction container 31, and the pore size of the filter 32 is smaller than the particle size of the photocatalyst.

[0039] In specific implementation, after being treated by the membrane separation unit 2, the sewage enters the reaction vessel 31 of the photocatalytic treatment unit 3. A reaction chamber 311 is provided inside the reaction vessel 31, and the sewage enters the reaction chamber 311 through the photocatalytic treatment inlet 312. In the reaction chamber 311, the photocatalyst is activated by the excitation light source, thereby degrading the pollutants in the sewage. The target liquid discharge port 313 is located at the top of the reaction vessel 31, and the treated liquid flows out through the target liquid discharge port 313 and enters the target liquid recovery unit 5. However, in order to prevent the photocatalyst from flowing out with the liquid and entering the target liquid recovery unit 5 during the treatment process, a filter screen 32 is installed in the top of the reaction vessel 31, and the outer peripheral edge of the filter screen 32 is connected to the inner peripheral wall of the reaction vessel 31, and its aperture is designed to be smaller than the particle size of the photocatalyst, which can effectively intercept the photocatalyst flowing to the target liquid recovery unit 5, prevent them from entering the target liquid recovery unit 5, and ensure the purity of the target liquid.

[0040] In some embodiments, a target liquid delivery pump is further included, which is disposed between the target liquid discharge port 313 and the target liquid collection port.

[0041] According to one embodiment of the present invention, the photocatalytic treatment unit 3 also includes a centrifugal mechanism 33 and an excitation light source; the centrifugal mechanism 33 is arranged in the reaction chamber 311, and can rotate in the reaction container 31 to drive the sewage in the reaction chamber 311 to move, so that the sewage contacts the filter 32, and under the action of the sewage, the photocatalyst contacts the excitation light source, and the rotation axis of the centrifugal mechanism 33 is parallel to the height direction H of the reaction container; the excitation light source is arranged in the reaction chamber 311.

[0042] In specific implementation, the sewage enters the reaction container 31 of the photocatalytic treatment unit 3 after being treated by the membrane separation unit 2. A reaction chamber 311 is provided inside the reaction container 31. The sewage enters the reaction chamber 311 through the photocatalytic treatment inlet 312. In the reaction chamber 311, the centrifugal mechanism 33 drives the sewage to flow by rotation, so that the sewage is in full contact with the filter screen 32, so that the photocatalyst on the filter screen 32 is dispersed; and in the process of sewage flowing, the photocatalyst is in contact with the excitation light source to clean the surface of the light source; in addition, the rotation of the centrifugal mechanism 33 can also promote full contact between the sewage and the photocatalyst, ensuring the efficient progress of the photocatalytic reaction; and the centrifugal mechanism 33 drives the sewage to flow by rotation, and under the action of centrifugal force, the photocatalyst on the upper layer of the sewage will flow into the recovery unit 4.

[0043] In this embodiment, the centrifugal mechanism 33 may include a driving motor and blades. The driving motor has an output shaft, the output shaft is arranged along the height direction H of the reaction container, and the blades are connected to the output shaft.

[0044] According to one embodiment of the present invention, the side wall of the reaction container 31 has a photocatalyst outlet 314 that can communicate with the reaction chamber 311 ; the photocatalyst recovery unit 4 is located outside the reaction container 31 and is arranged at the photocatalyst outlet 314 .

[0045] According to one embodiment of the present invention, the photocatalyst recovery unit 4 includes a recovery shell 41 and a guide plate 42; the recovery shell 41 is arranged on the side wall of the reaction container 31, and has a recovery chamber 411 and a photocatalyst inlet 412 that can be connected to the recovery chamber 411; the photocatalyst inlet 412 is located on the side wall of the recovery shell 41 and is connected to the photocatalyst discharge port 314; the guide plate 42 is located in the recovery chamber 411, and the end of the guide plate 42 is connected to the lower edge of the photocatalyst inlet 412, and the guide plate 42 is arranged to be inclined upward in the radial outward direction of the reaction container 31, and the guide plate 42 can divide the recovery chamber 411 into a first sub-chamber 4101 and a second sub-chamber 4102, and the first sub-chamber 4101 Located above the second sub-chamber 4102, the guide plate 42 has a first end and a second end which are arranged opposite to each other along a direction perpendicular to the inclination thereof, and the first end and the second end are respectively connected to the side walls of the recovery chamber 411; a recovery shell inlet 40 is formed between the free end of the guide plate 42 and the side wall of the recovery chamber 411; the first sub-chamber 4101 is connected to the second sub-chamber 4102 through the recovery shell inlet 40; wherein, when the height of the sewage in the reaction chamber 311 is located at the photocatalyst discharge port 314, the centrifugal mechanism 33 can rotate to make the photocatalyst in the reaction chamber 311 flow into the second sub-chamber 4102 through the photocatalyst discharge port 314, the first sub-chamber 4101 and the recovery shell inlet 40 in sequence.

[0046] In specific implementation, after being treated by the membrane separation unit 2, the sewage enters the reaction container 31 of the photocatalytic treatment unit 3. A reaction chamber 311 is provided inside the reaction container 31. The sewage enters the reaction chamber 311 through the photocatalytic treatment inlet 312. In the reaction chamber 311, the centrifugal mechanism 33 drives the sewage to flow by rotating. Since the photocatalyst is in a suspended state, the photocatalyst is located in the upper layer of the sewage. Under the action of centrifugal force, the photocatalyst in the upper layer of the sewage will sequentially pass through the photocatalyst outlet 314, the first sub-chamber 4101 and the recovery shell inlet 40, and flow into the second sub-chamber 4102. In addition, since the guide plate 42 is arranged at an angle, the photocatalyst can be prevented from flowing back into the reaction chamber 311, that is, the photocatalyst flows into the second sub-chamber in a unidirectional manner and cannot flow back into the reaction chamber 311. It can be understood that the photocatalyst will flow into the second sub-chamber 4102 along with a portion of the sewage.

[0047] In this embodiment, the recovery chamber 411 can be formed by surrounding a first side plate, a second side plate, a third side plate, a fourth side plate and a bottom plate. The height of the fourth side plate is less than the height from the first side plate to the third side plate. The fourth side plate can be located at the bottom of the recovery shell 41 and connected to the side wall of the reaction container 31.

[0048] According to one embodiment of the present invention, a photocatalyst discharge mechanism 6 is further included, which is arranged at the photocatalyst discharge port 314. Figure 5 As shown, the photocatalyst outlet 314 can be opened when the rotation speed of the centrifugal mechanism 33 is higher than a preset value, or, as shown in FIG. Figure 6 As shown, the photocatalyst discharge port 314 is closed when the rotation speed of the centrifugal mechanism 33 is lower than a preset value.

[0049] In specific implementation, during the rotation of the centrifugal mechanism 33, when the rotation speed reaches a preset value, the photocatalyst discharge mechanism 6 can be opened to allow the photocatalyst to be discharged through the photocatalyst discharge port 314. This design helps to control the amount of photocatalyst discharged and facilitates collection. When the rotation speed of the centrifugal mechanism 33 is lower than the preset value, the photocatalyst discharge mechanism 6 will automatically close the discharge port to ensure that the photocatalyst remains in the reaction chamber 311, continues to contact with the sewage and participates in the photocatalytic reaction. Through this intelligent adjustment mechanism, the discharge and recovery of the photocatalyst can be effectively controlled, so that the photocatalyst can be efficiently utilized and waste can be prevented.

[0050] In this embodiment, the photocatalyst discharge mechanism 6 is equivalent to a gate, which is opened when the photocatalyst needs to be recovered.

[0051] According to one embodiment of the present invention, the photocatalyst discharge mechanism 6 includes a linear motion mechanism 61 and a photocatalyst discharge door 62; the linear motion mechanism 61 is arranged on the reaction container 31 and connected to the photocatalyst discharge door 62, and can drive the photocatalyst discharge door 62 to reciprocate linearly to open the photocatalyst discharge port 314 when the rotation speed of the centrifugal mechanism 33 is higher than a preset value, or, to close the photocatalyst discharge port 314 when the rotation speed of the centrifugal mechanism 33 is lower than a preset value; the sewage treatment device also includes a controller, which is electrically connected to the linear motion mechanism 61 and the centrifugal mechanism 33.

[0052] In specific implementation, the centrifugal mechanism 33 drives the sewage in the reaction chamber 311 to flow. When the rotation speed of the centrifugal mechanism 33 reaches a preset value, the linear motion mechanism 61 starts to work, driving the photocatalyst discharge door 62 to perform reciprocating linear motion in the vertical direction, thereby opening the photocatalyst discharge port 314 and discharging the photocatalyst to the outside. This design can accurately control the discharge amount of the photocatalyst to prevent excessive photocatalyst from being wasted or retained in the reaction chamber 311. If the rotation speed of the centrifugal mechanism 33 is lower than the preset value, the linear motion mechanism 61 drives the photocatalyst discharge door 62 to close the discharge port to ensure that the photocatalyst continues to remain in the reaction chamber 311 and participate in the subsequent photocatalytic reaction. Through the reciprocating action of the linear motion mechanism 61, the discharge and recovery of the photocatalyst can be accurately and reliably adjusted, the use efficiency of the photocatalyst is optimized, and the stability and treatment effect of the entire sewage treatment device are improved.

[0053] According to one embodiment of the present invention, the recovery shell 41 further has a discharge hole 413 , which is located at the bottom of the recovery shell 41 and communicates with the second sub-chamber 4102 .

[0054] In a specific implementation, the discharge hole 413 can discharge the photocatalyst recovered in the recovery shell 41 to the outside.

[0055] According to one embodiment of the present invention, a control valve is further included, and the control valve is disposed at the discharge hole 413 .

[0056] In specific implementation, the addition of the control valve allows the opening and closing of the discharge hole 413 to be precisely controlled according to actual needs. When the photocatalyst needs to be discharged, the control valve opens to allow the photocatalyst to flow out smoothly through the discharge hole 413; when the discharge is not required, the control valve closes the discharge hole 413 to avoid unnecessary discharge of the photocatalyst and ensure stable operation of the system.

[0057] In this embodiment, the control valve may be a manual control valve in the prior art.

[0058] According to one embodiment of the present invention, it further comprises a photocatalyst receiving unit 7 having a photocatalyst receiving chamber 71 and a photocatalyst recovery inlet 72 capable of communicating with the photocatalyst receiving chamber 71 ; the photocatalyst recovery inlet 72 is connected with the discharge hole 413 .

[0059] In specific implementation, during the treatment process, after the photocatalytic reaction, the photocatalyst is usually discharged along with the flow of sewage. To ensure that the photocatalyst can be recovered in large quantities, a photocatalyst receiving unit 7 is provided at the discharge hole 413. The unit includes a photocatalyst receiving chamber 71, and a photocatalyst recovery inlet 72 is connected to the discharge hole 413, so that the discharged photocatalyst can flow into the photocatalyst receiving chamber 71 through the recovery inlet.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sewage treatment device, characterized in that: It comprises a sewage containing unit (1), a membrane separation unit (2), a photocatalytic treatment unit (3), a photocatalyst recovery unit (4) and a target liquid recovery unit (5); The sewage containing unit (1) comprises a sewage containing chamber (11) and a sewage outlet (12) capable of communicating with the sewage containing chamber (11); The membrane separation unit (2) comprises a membrane separation treatment inlet (21) and a membrane separation treatment outlet (22); the membrane separation treatment inlet (21) is connected to the sewage outlet (12); The photocatalytic treatment unit (3) comprises a reaction container (31) and a filter (32); The reaction container (31) comprises a reaction chamber (311), a photocatalytic treatment inlet (312) and a target liquid discharge outlet (313), wherein the target liquid discharge outlet (313) is located at the top of the reaction container (31); The filter screen (32) is located inside the top of the reaction container (31), the outer periphery of the filter screen (32) is connected to the inner peripheral wall of the reaction container (31), and the pore size of the filter screen (32) is smaller than the particle size of the photocatalyst; A photocatalyst is provided in the reaction chamber (311); the membrane separation treatment outlet (22) is connected to the target liquid discharge outlet (313) in sequence through the photocatalytic treatment inlet (312) and the reaction chamber (311); The target liquid recovery unit (5) comprises a target liquid containing chamber (50) and a target liquid collecting port; the target liquid discharge port (313) is connected to the target liquid containing chamber (50) via the target liquid collecting port; The photocatalyst recovery unit (4) is arranged on the photocatalytic treatment unit (3) and is capable of recovering photocatalyst from sewage in the reaction chamber (311); The photocatalytic treatment unit (3) also includes a centrifugal mechanism (33) and an excitation light source; The centrifugal mechanism (33) is arranged in the reaction chamber (311) and can rotate in the reaction container (31) to drive the sewage in the reaction chamber (311) to move, so that the sewage contacts the filter screen (32), and under the action of the sewage, the photocatalyst contacts the excitation light source, and the rotation axis of the centrifugal mechanism (33) is parallel to the height direction (H) of the reaction container; The excitation light source is arranged in the reaction chamber (311); The side wall of the reaction container (31) has a photocatalyst discharge port (314) capable of communicating with the reaction chamber (311); The photocatalyst recovery unit (4) is located outside the reaction container (31) and is arranged at the photocatalyst discharge port (314); The sewage treatment device further comprises a photocatalyst discharge mechanism (6), which is arranged at the photocatalyst discharge port (314), and the photocatalyst discharge mechanism (6) comprises a linear motion mechanism (61) and a photocatalyst discharge door (62); the linear motion mechanism (61) is arranged on the reaction container (31) and connected to the photocatalyst discharge door (62), and can drive the photocatalyst discharge door (62) to reciprocate linearly so as to open the photocatalyst discharge port (314) when the rotation speed of the centrifugal mechanism (33) is higher than a preset value, or to close the photocatalyst discharge port (314) when the rotation speed of the centrifugal mechanism (33) is lower than a preset value; The sewage treatment device also includes a controller electrically connected to the linear motion mechanism (61) and the centrifugal mechanism (33).

2. The sewage treatment device according to claim 1, characterized in that: The photocatalyst recovery unit (4) comprises a recovery shell (41) and a guide plate (42); The recovery shell (41) is arranged on the side wall of the reaction container (31), and has a recovery chamber (411) and a photocatalyst inlet (412) capable of communicating with the recovery chamber (411); the photocatalyst inlet (412) is located on the side wall of the recovery shell (41) and is connected with the photocatalyst outlet (314); The guide plate (42) is located in the recovery chamber (411), the end of the guide plate (42) is connected to the lower edge of the photocatalyst inlet (412), the guide plate (42) is arranged to be inclined upward along the radial outward direction of the reaction container (31), the guide plate (42) can divide the recovery chamber (411) into a first sub-chamber (4101) and a second sub-chamber (4102), the first sub-chamber (4101) is located above the second sub-chamber (4102), the guide plate (42) has a first end and a second end arranged opposite to each other along a direction perpendicular to the inclination thereof, the first end and the second end are respectively connected to the side wall of the recovery chamber (411); a recovery shell inlet (40) is formed between the free end of the guide plate (42) and the side wall of the recovery chamber (411); the first sub-chamber (4101) is connected to the second sub-chamber (4102) through the recovery shell inlet (40); Wherein, when the height of the sewage in the reaction chamber (311) is located at the photocatalyst discharge port (314), the centrifugal mechanism (33) can rotate to cause the photocatalyst in the reaction chamber (311) to flow into the second sub-chamber (4102) in sequence through the photocatalyst discharge port (314), the first sub-chamber (4101) and the recovery shell inlet (40).

3. The sewage treatment device according to claim 2, characterized in that: The recovery shell (41) further comprises a discharge hole (413), wherein the discharge hole (413) is located at the bottom of the recovery shell (41) and is connected to the second sub-chamber (4102).

4. The sewage treatment device according to claim 3, characterized in that: Also included is a control valve, which is disposed at the discharge hole (413).

5. The sewage treatment device according to claim 4, characterized in that: It also comprises a photocatalyst receiving unit (7) having a photocatalyst receiving cavity (71) and a photocatalyst recovery inlet (72) capable of communicating with the photocatalyst receiving cavity (71); The photocatalyst recovery inlet (72) is connected to the discharge hole (413).

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