Graded sewage treatment device

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a graded sewage treatment device. The first treatment assembly comprises a first shell unit, a first supporting unit, a first light-emitting unit and a first photocatalyst; a plurality of pipeline assemblies; one end of the pipeline assembly is detachably connected with the first shell unit, and the other end of the pipeline assembly is detachably connected with the second treatment assembly; one end of the pipeline assembly is detachably connected with the third treatment assembly, and the other end of the pipeline assembly is detachably connected with the second treatment assembly; the processing state comprises that the first light-emitting unit emits ultraviolet light to the first photocatalyst; substances generated by reaction of ultraviolet light emitted by the first light-emitting unit and the first photocatalyst are located in a space surrounded by the first shell unit; sewage sequentially flows through the hollow cavity of the first shell unit, the hollow cavity of the second treatment assembly and the hollow cavity of the third treatment assembly. Therefore, the problem of poor sewage treatment effect is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, specifically, relate to a hierarchical sewage treatment device. BACKGROUND

[0002] With the rapid advance of urbanization and industrialization, the quantity of industrial sewage and domestic wastewater greatly increases, if these sewage is directly discharged, can cause the pollution to water resources, therefore needs treating the sewage before sewage discharge. Purifying sewage through acid-base neutralization reaction is easy to cause secondary pollution to the environment, can carry out secondary treatment to the sewage through the photocatalyst, the photocatalyst is a method for treating sewage through photocatalytic oxidation technology, when the photocatalyst material is exposed under the light source, will make the photocatalyst generate active oxidant, these oxidants can react with the pollutants in the sewage, and oxidize and decompose into harmless substances.

[0003] However, in the process of treating sewage by photocatalyst, the metal ions in the sewage can affect the absorption of ultraviolet light by the photocatalyst, which may result in the photocatalyst not achieving the ideal effect in treating the sewage. At the same time, different pollutants have different requirements for the size of the photocatalyst and the wavelength of ultraviolet light, which leads to poor effect of treating sewage by photocatalyst. SUMMARY

[0004] To solve the problem of poor sewage treatment effect, the utility model provides a hierarchical sewage treatment device, the hierarchical sewage treatment device includes:

[0005] The first processing assembly includes a first housing unit, a first support unit, a first light emitting unit and a first photocatalyst. The first support unit and the first light emitting unit are detachably connected with the first housing unit. The first support unit and the first light emitting unit are arranged in the hollow cavity of the first housing unit. The first photocatalyst is in the form of particles. The first photocatalyst is coated on the outer surface of the first support unit. The diameter of the first photocatalyst is less than 10 nm.

[0006] A plurality of pipeline assemblies;

[0007] The second processing assembly is detachably connected with the first housing unit at one end and detachably connected with the second processing assembly at the other end. The hollow cavity of the first housing unit and the hollow cavity of the second processing assembly are communicated through the pipeline assembly.

[0008] The third processing assembly is detachably connected with the second processing assembly at one end and detachably connected with the second processing assembly at the other end. The hollow cavity of the third processing assembly and the hollow cavity of the second processing assembly are communicated through the pipeline assembly.

[0009] The hierarchical sewage treatment device comprises a treatment state; the treatment state comprises that the first light emitting unit emits ultraviolet light towards the first photocatalyst; the ultraviolet light emitted by the first light emitting unit reacts with the substance generated by the first photocatalyst to be located in the space surrounded by the first shell unit; and the sewage flows through the hollow cavity of the first shell unit, the hollow cavity of the second treatment assembly and the hollow cavity of the third treatment assembly in sequence.

[0010] In some embodiments, the first light emitting unit emits ultraviolet light with a wavelength less than 200 nm.

[0011] In some embodiments, the first support unit comprises a first support part and a second support part; the first support part and the second support part are respectively detachably connected with the first shell unit; the first support part and the second support part are respectively arranged in the hollow cavity surrounded by the first shell unit; the first support part and the second support part are arranged in a spaced manner; the first support part is sleeved on the outer circumferential side of the second support part; the first photocatalyst is coated on the outer surface of the first support part; and the first photocatalyst is coated on the outer surface of the second support part.

[0012] The outer circumferential surface of the first support part and the space surrounded by the first shell unit form a first area; the inner circumferential wall of the first support part and the outer circumferential wall of the second support part surround a space to form a second area; the space surrounded by the second support part forms a third area; the first area and the second area are in communication through the gap of the first photocatalyst on the outer surface of the first support part; and the second area and the third area are in communication through the gap of the first photocatalyst on the surface of the second support part.

[0013] The treatment state further comprises that the sewage flows through the third area, the second area, the first area, the hollow cavity of the second treatment assembly and the hollow cavity of the third treatment assembly in sequence.

[0014] In some embodiments, the first light emitting unit is arranged in the second area.

[0015] In some embodiments, the second processing assembly comprises a second housing unit, a second support unit, a second light emitting unit, and a second photocatalyst; the second support unit and the second light emitting unit are detachably connected with the second housing unit; the second support unit and the second light emitting unit are respectively arranged in the hollow cavity of the second housing unit; the second photocatalyst is in the form of particles; the second photocatalyst is coated on the outer surface of the second support unit; the diameter of the second photocatalyst is greater than or equal to 13 nm and less than or equal to 20 nm; one end of the pipeline assembly is detachably connected with the first housing unit, and the other end is detachably connected with the second housing unit; the hollow cavity of the first housing unit and the hollow cavity of the second housing unit are communicated through the pipeline assembly.

[0016] The processing state further comprises that the second light emitting unit emits ultraviolet light towards the second photocatalyst; the substance generated by the reaction between the ultraviolet light emitted by the second light emitting unit and the second photocatalyst is located in the space enclosed by the second housing unit; the sewage flows through the hollow cavities of the first housing unit, the second housing unit, and the third processing assembly in sequence.

[0017] In some embodiments, the wavelength of the ultraviolet light emitted by the second light emitting unit is greater than or equal to 240 nm and less than or equal to 260 nm.

[0018] In some embodiments, the second support unit comprises a third support part and a fourth support part; the third support part and the fourth support part are detachably connected with the first housing unit; the third support part and the fourth support part are respectively arranged in the hollow cavity enclosed by the first housing unit; the third support part and the fourth support part are arranged at intervals; the third support part is sleeved on the outer circumferential side of the fourth support part; the second photocatalyst is coated on the outer surface of the third support part; the second photocatalyst is coated on the outer surface of the fourth support part.

[0019] The outer circumferential surface of the third support part and the space enclosed by the first housing unit form a fourth region; the space enclosed by the inner circumferential wall of the third support part and the outer circumferential wall of the fourth support part forms a fifth region; the space enclosed by the fourth support part forms a sixth region; the fourth region and the fifth region are communicated through the third support part; the fifth region and the sixth region are communicated through the fourth support part.

[0020] The processing state further comprises that the sewage flows through the hollow cavities of the first housing unit, the sixth region, the fifth region, the fourth region, and the hollow cavity of the third processing assembly in sequence.

[0021] In some embodiments, the third processing assembly comprises a third housing unit, a third support unit, a third light emitting unit, and a third photocatalyst; the third support unit and the third light emitting unit are detachably connected with the third housing unit; the third support unit and the third light emitting unit are respectively arranged in the hollow cavity of the third housing unit; the third photocatalyst is in the form of particles; the third photocatalyst is detachably connected with the outer surface of the third support unit; the diameter of the third photocatalyst is greater than or equal to 8 nm and less than 13 nm; one end of the pipeline assembly is detachably connected with the second processing assembly, and the other end is detachably connected with the third housing unit; the hollow cavity of the second processing assembly and the hollow cavity of the third housing unit are communicated through the pipeline assembly.

[0022] The processing state further comprises that the third light emitting unit emits ultraviolet light towards the third photocatalyst; the substance generated by the reaction between the ultraviolet light emitted by the third light emitting unit and the third photocatalyst is located in the space surrounded by the third housing unit; the sewage flows through the hollow cavities of the first housing unit, the second processing assembly, and the third housing unit in sequence.

[0023] In some embodiments, the wavelength of the ultraviolet light emitted by the third light emitting unit is greater than or equal to 200 nm and less than or equal to 230 nm.

[0024] In some embodiments, the third support unit comprises a fifth support part and a sixth support part; the fifth support part and the sixth support part are detachably connected with the third housing unit; the fifth support part and the sixth support part are respectively arranged in the hollow cavity surrounded by the third housing unit; the fifth support part and the sixth support part are arranged at intervals; the fifth support part is sleeved on the outer circumferential side of the sixth support part; the third photocatalyst is coated on the outer surface of the fifth support part; the third photocatalyst is coated on the outer surface of the sixth support part.

[0025] The outer circumferential surface of the fifth support part and the space surrounded by the third housing unit form a seventh region; the space surrounded by the inner circumferential wall of the fifth support part and the outer circumferential wall of the sixth support part forms an eighth region; the space surrounded by the sixth support part forms a ninth region; the seventh region and the eighth region are communicated through the fifth support part; the eighth region and the ninth region are communicated through the sixth support part.

[0026] The processing state further comprises that the sewage flows through the hollow cavities of the first housing unit, the second processing assembly, the ninth region, the eighth region, and the seventh region in sequence.

[0027] To solve the problem of poor sewage treatment effect, the utility model has the following advantages:

[0028] A tiered wastewater treatment device may include a first treatment component, a second treatment component, a third treatment component, and multiple pipeline components. The treatment process may involve wastewater sequentially flowing through the hollow cavity of the first outer shell unit, the hollow cavity of the second treatment component, and the hollow cavity of the third treatment component. Since metal ions in wastewater can affect the absorption of ultraviolet light by the photocatalyst, the photocatalyst may not achieve the desired treatment effect. Furthermore, because different pollutants have different requirements for photocatalyst size and ultraviolet light wavelength, the tiered wastewater treatment device is designed to prioritize the treatment of metal ions in the wastewater, preventing them from absorbing ultraviolet light and thus affecting the photocatalyst's reaction with ultraviolet light. Then, the second and third treatment components are designed to absorb organic matter in the wastewater, addressing the different requirements for photocatalyst size and ultraviolet light wavelength for different pollutants, thereby improving the wastewater treatment efficiency. Attached Figure Description

[0029] Figure 1 A schematic diagram of a first processing component according to one embodiment is shown;

[0030] Figure 2 A schematic diagram of a second processing component according to one embodiment is shown;

[0031] Figure 3 A schematic diagram of a third processing component according to one embodiment is shown;

[0032] Figure 4 A partial schematic diagram of a graded wastewater treatment device according to one embodiment is shown;

[0033] Figure 5 A partial schematic diagram of a graded wastewater treatment device according to another embodiment is shown;

[0034] Figure 6 A schematic diagram of a graded wastewater treatment device according to one embodiment is shown.

[0035] Reference numerals: 01 First processing component; 11 First housing unit; 111 First housing; 112 First water inlet; 113 First water outlet; 12 First support unit; 121 First support part; 122 Second support part; 13 First light-emitting unit; 14 First photocatalyst; 02 Second processing component; 21 Second housing unit; 211 Second housing; 212 Second water inlet; 213 Second water outlet; 22 Second support unit; 221 Third support part; 222 Fourth support part; 23 Second light-emitting unit; 24 Second photocatalyst; 03 Third processing component; 31 Third housing unit; 311 Third housing; 312 Third water inlet; 313 Third water outlet; 32 Third support unit; 321 Fifth support part; 322 Sixth support part; 33 Third light-emitting unit; 34 Third photocatalyst; 04 Piping assembly. DETAILED DESCRIPTION

[0036] The present disclosure will now be discussed with reference to a number of exemplary embodiments. It is to be appreciated that these embodiments are discussed solely for the purpose of enabling those with ordinary skill in the art to better understand and therefore implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way.

[0037] As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, are to be construed as "including but not limited to" the terms "consists of," "consisting of," "consists essentially of," and "consisting essentially of," are to be construed as "consisting of." The terms "based on" and "based upon" are to be construed as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment." The term "another embodiment" is to be construed as "at least one other embodiment." The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," "longitudinal," and similar terms are used for clarity in description of the figures and are not to be construed as limiting the scope of the application or its embodiments. These terms primarily serve to better describe the application and its embodiments, and are not used to limit the indicated device, element or component to a particular orientation, or to a particular manner of construction and operation. Also, some of the terms mentioned above, in addition to indicating the orientation or position relationship, can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances. In addition, the terms "mounting", "setting", "provided with", "connected", "connected" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or a monolithic structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated device, element or component. Unless otherwise stated, the meaning of "multiple" is two or more.

[0038] In the present embodiment, in the process of treating sewage by photocatalyst, a large amount of metal ions are contained in the sewage, and the metal ions can absorb ultraviolet light in the sewage, so that the photocatalyst cannot absorb enough ultraviolet light, thereby resulting in poor sewage treatment effect. The present embodiment discloses a hierarchical sewage treatment device, as shown in Figure 1 The hierarchical sewage treatment device comprises a first treatment assembly 01, as shown in Figure 1As shown, the first processing assembly 01 can include a first housing unit 11, a first support unit 12, a first light-emitting unit 13, and a first photocatalyst 14. The first support unit 12 and the first light-emitting unit 13 are respectively detachably connected with the first housing unit 11. The first support unit 12 and the first light-emitting unit 13 are respectively arranged in the hollow cavity of the first housing unit 11. The first photocatalyst 14 can be in a granular form. The first photocatalyst 14 can be coated on the outer surface of the first support unit 12. The diameter of the first photocatalyst 14 can be less than 10 nm. The first photocatalyst 14 can react with metal ions in the sewage. When the diameter of the first photocatalyst 14 is small, the surface area per unit mass of the first photocatalyst 14 increases, thereby increasing the active points on the surface of the first photocatalyst 14 that can react with ultraviolet light, so that the first photocatalyst 14 can generate more active oxygen compounds, which is conducive to increasing the treatment effect of the first photocatalyst 14 on metal ions in the sewage.

[0039] A plurality of pipeline assemblies 04. The second processing assembly 02 is detachably connected with the first housing unit 11 at one end and detachably connected with the second processing assembly 02 at the other end. The hollow cavity of the first housing unit 11 can be in communication with the hollow cavity of the second processing assembly 02 through the pipeline assembly 04. The third processing assembly 03 is detachably connected with the second processing assembly 02 at one end and detachably connected with the third processing assembly 03 at the other end. The hollow cavity of the third processing assembly 03 can be in communication with the hollow cavity of the second processing assembly 02 through the pipeline assembly 04. As shown Figure 6 The pipeline assembly 04 can be connected with the first processing assembly 01, the second processing assembly 02, and the third processing assembly 03 in sequence, so that the sewage can flow through the first processing assembly 01, the second processing assembly 02, and the third processing assembly 03 in sequence. Further, the hierarchical sewage treatment device can include a processing state. The processing state can include the first light-emitting unit 13 emitting ultraviolet light towards the first photocatalyst 14. The substances generated by the reaction of the ultraviolet light emitted by the first light-emitting unit 13 and the first photocatalyst 14 can be located in the space surrounded by the first housing unit 11. Since the metal ions in the sewage can affect the absorption of ultraviolet light by the photocatalyst, it can cause the photocatalyst to fail to achieve the ideal effect on the sewage. Therefore, the metal ions in the sewage can be preferentially treated to prevent the metal ions in the sewage from absorbing ultraviolet light, thereby affecting the reaction of the photocatalyst with ultraviolet light. The sewage can flow through the hollow cavities of the first housing unit 11, the second processing assembly 02, and the third processing assembly 03 in sequence. Since different pollutants have different requirements for the size of the photocatalyst and the wavelength of ultraviolet light, by designing the hierarchical sewage treatment device, the second processing assembly 02 and the third processing assembly 03 can be designed to absorb organic matter in the sewage, thereby improving the treatment effect of the sewage.

[0040] In the embodiment, the first light-emitting unit 13 can emit ultraviolet light with a wavelength less than 200 nm. If the wavelength is too long, the energy of the ultraviolet light may be insufficient, so that the first photocatalyst 14 cannot react with the ultraviolet light emitted by the first light-emitting unit 13. Therefore, the first light-emitting unit 13 can emit ultraviolet light with a wavelength less than 200 nm, so that the ultraviolet light can fully react with the first photocatalyst 14, thereby improving the treatment effect of the first photocatalyst 14 on metal ions in the sewage.

[0041] In the embodiment, the first support unit 12 can include a first support part 121 and a second support part 122. The first support part 121 and the second support part 122 are respectively detachably connected with the first shell unit 11, so as to fix the relative positions of the first support part 121 and the second support part 122. The first support part 121 and the second support part 122 can be respectively arranged in the hollow cavity surrounded by the first shell unit 11. The first support part 121 and the second support part 122 can be arranged in a spaced manner. The first support part 121 can be sleeved on the outer circumferential side of the second support part 122. The first support part 121 and the second support part 122 can include a plurality of radial holes, so that the sewage can pass through the first support part 121 and the second support part 122. The first photocatalyst 14 can be coated on the outer surface of the first support part 121. The first photocatalyst 14 can be coated on the outer surface of the second support part 122.

[0042] The space surrounded by the outer circumferential surface of the first support part 121 and the first shell unit 11 can be a first area. The space surrounded by the inner circumferential wall of the first support part 121 and the outer circumferential wall of the second support part 122 can be a second area. The space surrounded by the second support part 122 can be a third area. The first area and the second area can be communicated through the gap of the first photocatalyst 14 on the outer surface of the first support part 121. The second area and the third area can be communicated through the gap of the first photocatalyst 14 on the surface of the second support part 122. By arranging the first area, the second area and the third area, when the sewage passes through the first treatment assembly 01, the contact area and the contact time of the sewage with the first photocatalyst 14 are increased, so that the metal ions in the sewage can fully contact with the photocatalyst, thereby improving the treatment effect of the first photocatalyst 14 on the metal ions in the sewage.

[0043] The treatment state can further include that the sewage flows through the third area, the second area, the first area, the hollow cavity of the second treatment assembly 02, and the hollow cavity of the third treatment assembly 03 in sequence. By making the sewage flow through the third area, the second area, the first area, the hollow cavity of the second treatment assembly 02, and the hollow cavity of the third treatment assembly 03 in sequence, the sewage can sequentially contact with the third area, the second area, the first area, the hollow cavity of the second treatment assembly 02, and the hollow cavity of the third treatment assembly 03, so that the sewage can fully contact with the photocatalyst, thereby improving the treatment effect. In other embodiments, asFigure 4 As shown, sewage can enter the first housing 111 from the first inlet 112 and flow out from the first outlet 113.

[0044] In this embodiment, the first light-emitting unit 13 can be disposed in the second region, so that the first light-emitting unit 13 can simultaneously illuminate the photocatalysts on the surfaces of the first support portion 121 and the second support portion 122. In other embodiments, such as Figure 5 As shown, the first processing component 01 may include a plurality of first light-emitting units 13, which may be respectively disposed in the third region and the second region, so that the photocatalyst on the surface of the first support portion 121 and the second support portion 122 can fully react with ultraviolet light, thereby improving the treatment effect of sewage.

[0045] In this embodiment, as Figure 2 As shown, the second processing component 02 may include a second housing unit 21, a second support unit 22, a second light-emitting unit 23, and a second photocatalyst 24. The second support unit 22 and the second light-emitting unit 23 are detachably connected to the second housing unit 21. The second support unit 22 and the second light-emitting unit 23 can be respectively disposed within the hollow cavity of the second housing unit 21. The second photocatalyst 24 can be granular. The second photocatalyst 24 can be coated on the outer surface of the second support unit 22. The diameter of the second photocatalyst 24 can be greater than or equal to 13 nm and less than or equal to 20 nm. Since wastewater contains a large amount of formaldehyde, the second photocatalyst 24 can be used to absorb formaldehyde from the wastewater. When the diameter of the second photocatalyst 24 is greater than or equal to 13 nm and less than or equal to 20 nm, the surface area per unit mass of the second photocatalyst 24 is large, resulting in more active sites on the surface of the second photocatalyst 24 that can react with ultraviolet light, which is beneficial to increasing the treatment effect of the second photocatalyst 24 on formaldehyde in wastewater. Meanwhile, the larger diameter of the second photocatalyst 24 makes its processing easier and saves processing costs. One end of the conduit assembly 04 is detachably connected to the first housing unit 11, and the other end is detachably connected to the second housing unit 21. The hollow cavity of the first housing unit 11 can communicate with the hollow cavity of the second housing unit 21 through the conduit assembly 04.

[0046] The processing state can further include the second light emitting unit 23 emitting ultraviolet light toward the second photocatalyst 24. The substance generated by the reaction between the ultraviolet light emitted by the second light emitting unit 23 and the second photocatalyst 24 can be located in the space surrounded by the second housing unit 21. The sewage can flow through the hollow cavity of the first housing unit 11, the hollow cavity of the second housing unit 21, and the hollow cavity of the third processing assembly 03 in sequence. Since different pollutants have different requirements for the size of the photocatalyst and the wavelength of the ultraviolet light, by designing a hierarchical sewage treatment device, the second processing assembly 02 can be designed to absorb formaldehyde in the sewage according to the different requirements of different pollutants for the size of the photocatalyst and the wavelength of the ultraviolet light, thereby improving the treatment effect of the sewage.

[0047] In this embodiment, the wavelength of the ultraviolet light emitted by the second light emitting unit 23 can be greater than or equal to 240 nm and less than or equal to 260 nm. If the wavelength is too long, the energy of the ultraviolet light may be insufficient, thereby causing the second photocatalyst 24 to be insufficient to react with the ultraviolet light emitted by the second light emitting unit 23. Meanwhile, if the wavelength is too short, only a small part of the ultraviolet light can react with the second photocatalyst 24. Therefore, the wavelength of the ultraviolet light emitted by the second light emitting unit 23 can be less than 200 nm, so as to ensure that the ultraviolet light can fully react with the second photocatalyst 24 and improve the treatment effect of the second photocatalyst 24 on metal ions in the sewage.

[0048] In this embodiment, the second support unit 22 can include a third support portion 221 and a fourth support portion 222. The third support portion 221 and the fourth support portion 222 are respectively detachably connected with the first housing unit 11, so as to fix the relative positions of the third support portion 221 and the fourth support portion 222. The third support portion 221 and the fourth support portion 222 can be respectively arranged in the hollow cavity surrounded by the first housing unit 11. The third support portion 221 and the fourth support portion 222 can be arranged in a spaced manner. The third support portion 221 can be arranged on the outer circumferential side of the fourth support portion 222. The third support portion 221 and the fourth support portion 222 can include a plurality of holes penetrating in the radial direction, so that the sewage can pass through the third support portion 221 and the fourth support portion 222. The second photocatalyst 24 can be coated on the outer surface of the third support portion 221. The second photocatalyst 24 can be coated on the outer surface of the fourth support portion 222.

[0049] The space surrounded by the outer circumferential surface of the third support part 221 and the first shell unit 11 can be a fourth area. The space surrounded by the inner circumferential wall of the third support part 221 and the outer circumferential wall of the fourth support part 222 can be a fifth area. The space surrounded by the fourth support part 222 can be a sixth area. The fourth area and the fifth area can be communicated through the third support part 221. The fifth area and the sixth area can be communicated through the fourth support part 222. The processing state can further include that the sewage flows through the hollow cavity of the first shell unit 11, the sixth area, the fifth area, the fourth area, and the hollow cavity of the third processing assembly 03 in sequence. By arranging the fourth area, the fifth area, and the sixth area, the contact area and time of the sewage with the second photocatalyst 24 are increased when the sewage passes through the second processing assembly 02, so that the formaldehyde in the sewage can fully contact with the photocatalyst, and thus the processing effect of the second photocatalyst 24 on the formaldehyde in the sewage is improved. In some other embodiments, the sewage can enter the second shell 211 from the second water inlet 212 and flow out from the second water outlet 213.

[0050] In the present embodiment, as Figure 3As shown, the third processing assembly 03 can include a third shell unit 31, a third support unit 32, a third light emitting unit 33, and a third photocatalyst 34. The third support unit 32 and the third light emitting unit 33 are detachably connected with the third shell unit 31 respectively. The third support unit 32 and the third light emitting unit 33 are arranged in the hollow cavity of the third shell unit 31 respectively. The third photocatalyst 34 is arranged in a granular shape. The third photocatalyst 34 is detachably connected with the outer surface of the third support unit 32. The diameter of the third photocatalyst 34 can be greater than or equal to 8 nm and less than 13 nm. Since the sewage contains a large amount of formaldehyde, the third photocatalyst 34 can be used to absorb dimethylformamide in the sewage. When the diameter of the third photocatalyst 34 is greater than or equal to 8 nm and less than 13 nm, the surface area per unit mass of the third photocatalyst 34 is large, so that the surface of the third photocatalyst 34 has more active points for reaction with ultraviolet light, which is conducive to increasing the treatment effect of the third photocatalyst 34 on dimethylformamide in the sewage. At the same time, the diameter of the third photocatalyst 34 is slightly larger than that of the second photocatalyst 24, which makes the processing of the third photocatalyst 34 easier and saves the processing cost of the third photocatalyst 34. Since the second photocatalyst 24 has a large volume and low processing cost, the sewage can be made to pass through the second photocatalyst 24 first to treat formaldehyde and part of dimethylformamide in the sewage, and then pass through the third photocatalyst 34 to further treat dimethylformamide in the sewage. At the same time, passing through the second photocatalyst 24 first reduces the amount of pollutants in the sewage that react with the third photocatalyst 34, saves the amount of the third photocatalyst 34, reduces the cost of sewage treatment while ensuring the treatment quality. One end of the pipeline assembly 04 is detachably connected with the second processing assembly 02, and the other end is detachably connected with the third shell unit 31. The hollow cavity of the second processing assembly 02 and the hollow cavity of the third shell unit 31 can be communicated through the pipeline assembly 04.

[0051] The processing state can further include that the third light emitting unit 33 emits ultraviolet light toward the third photocatalyst 34. The substance generated by the reaction between the ultraviolet light emitted by the third light emitting unit 33 and the third photocatalyst 34 can be located in the space surrounded by the third shell unit 31. The sewage can flow through the hollow cavity of the first shell unit 11, the hollow cavity of the second processing assembly 02, and the hollow cavity of the third shell unit 31 in sequence. Since different pollutants have different requirements for the size of the photocatalyst and the wavelength of the ultraviolet light, by designing a staged sewage treatment device, the third processing assembly 03 can be designed to absorb dimethylformamide in the sewage according to the different requirements of different pollutants for the size of the photocatalyst and the wavelength of the ultraviolet light, thereby improving the treatment effect of the sewage.

[0052] In the embodiment, the wavelength of the ultraviolet light emitted by the third light emitting unit 33 can be greater than or equal to 200 nm and less than or equal to 230 nm. If the wavelength is too long, the energy of the ultraviolet light can be insufficient, so that the third photocatalyst 34 is insufficient to react with the ultraviolet light emitted by the third light emitting unit 33. If the wavelength is too short, only a small part of the ultraviolet light can react with the third photocatalyst 34. Therefore, the wavelength of the ultraviolet light emitted by the third light emitting unit 33 can be less than 200 nm, so that the ultraviolet light can fully react with the third photocatalyst 34, and the treatment effect of the third photocatalyst 34 on dimethylformamide in the wastewater is improved.

[0053] In the embodiment, the third supporting unit 32 can include a fifth supporting part 321 and a sixth supporting part 322. The fifth supporting part 321 and the sixth supporting part 322 are respectively detachably connected with the third shell unit 31, so as to fix the relative positions of the fifth supporting part 321 and the sixth supporting part 322. The fifth supporting part 321 and the sixth supporting part 322 can be respectively arranged in the hollow cavity surrounded by the third shell unit 31. The fifth supporting part 321 and the sixth supporting part 322 can be arranged in a spaced manner. The fifth supporting part 321 can be sleeved on the outer circumferential side of the sixth supporting part 322. The fifth supporting part 321 and the sixth supporting part 322 can include a plurality of holes penetrating in the radial direction, so that the wastewater can pass through the fifth supporting part 321 and the sixth supporting part 322. The third photocatalyst 34 can be coated on the outer surface of the fifth supporting part 321. The third photocatalyst 34 can be coated on the outer surface of the sixth supporting part 322.

[0054] The space surrounded by the outer circumferential surface of the fifth supporting part 321 and the third shell unit 31 can be a seventh region. The space surrounded by the inner circumferential wall of the fifth supporting part 321 and the outer circumferential wall of the sixth supporting part 322 can be an eighth region. The space surrounded by the sixth supporting part 322 can be a ninth region. The seventh region can be in communication with the eighth region through the fifth supporting part 321. The eighth region and the ninth region can be in communication through the sixth supporting part 322. In other embodiments, the wastewater can enter the third shell 311 from the third water inlet 312 and flow out from the third water outlet 313.

[0055] The treatment state can further include that the wastewater sequentially flows through the hollow cavity of the first shell unit 11, the hollow cavity of the second treatment assembly 02, the ninth region, the eighth region, and the seventh region. By arranging the ninth region, the eighth region, and the seventh region, when the wastewater passes through the third treatment assembly 03, the contact area and time of the wastewater and the third photocatalyst 34 are increased, so that the dimethylformamide in the wastewater can fully contact with the photocatalyst, and the treatment effect of the third photocatalyst 34 on dimethylformamide in the wastewater is improved.

[0056] It is understood by those of ordinary skill in the art that the above-mentioned embodiments are specific cases for implementing the present disclosure, and in actual applications, various changes can be made in form and details without departing from the scope of the present disclosure.

Claims

1. A staged sewage treatment apparatus, characterised in that, The hierarchical sewage treatment device comprises: A first processing assembly, the first processing assembly comprises a first shell unit, a first support unit, a first light emitting unit, a first photocatalyst; the first support unit, the first light emitting unit are respectively detachably connected with the first shell unit; the first support unit, the first light emitting unit are respectively arranged in the hollow cavity of the first shell unit; the first photocatalyst is arranged in a granular form; the first photocatalyst is coated on the outer surface of the first support unit; the diameter of the first photocatalyst is less than 10 nm; A plurality of pipeline assemblies; A second processing assembly, one end of the pipeline assembly is detachably connected with the first shell unit, and the other end is detachably connected with the second processing assembly; the hollow cavity of the first shell unit and the hollow cavity of the second processing assembly are communicated through the pipeline assembly; A third processing assembly, one end of the pipeline assembly is detachably connected with the third processing assembly, and the other end is detachably connected with the second processing assembly; the hollow cavity of the third processing assembly and the hollow cavity of the second processing assembly are communicated through the pipeline assembly; The hierarchical sewage treatment device comprises a processing state; the processing state comprises that the first light emitting unit emits ultraviolet light towards the first photocatalyst; the ultraviolet light emitted by the first light emitting unit and the substances generated by the reaction of the first photocatalyst are located in the space surrounded by the first shell unit; the sewage flows through the hollow cavities of the first shell unit, the second processing assembly and the third processing assembly in sequence.

2. The hierarchical sewage treatment device according to claim 1, wherein The wavelength of the ultraviolet light emitted by the first light emitting unit is less than 200 nm.

3. The hierarchical sewage treatment device according to claim 1, wherein The first support unit comprises a first support part and a second support part; the first support part and the second support part are respectively detachably connected with the first shell unit; the first support part and the second support part are respectively arranged in the hollow cavity surrounded by the first shell unit; the first support part and the second support part are arranged at intervals; the first support part is sleeved on the outer circumferential side of the second support part; the first photocatalyst is coated on the outer surface of the first support part; The first photocatalyst is coated on the outer surface of the second support part; The space surrounded by the outer circumferential surface of the first support part and the first shell unit is a first area; The space surrounded by the inner circumferential wall of the first support part and the outer circumferential wall of the second support part is a second area; the space surrounded by the second support part is a third area; the first area and the second area are communicated through the gap of the first photocatalyst on the outer surface of the first support part; the second area and the third area are communicated through the gap of the first photocatalyst on the surface of the second support part; The processing state further comprises that the sewage flows through the third area, the second area, the first area, the hollow cavity of the second processing assembly and the hollow cavity of the third processing assembly in sequence.

4. The hierarchical sewage treatment device according to claim 3, wherein the first light-emitting unit is arranged in the second region.

5. The hierarchical sewage treatment device according to claim 1, wherein the second treatment assembly comprises a second housing unit, a second support unit, a second light-emitting unit, and a second photocatalyst; the second support unit and the second light-emitting unit are detachably connected to the second housing unit; the second support unit and the second light-emitting unit are arranged in the hollow cavity of the second housing unit; the second photocatalyst is arranged in the form of particles; the second photocatalyst is coated on the outer surface of the second support unit; the diameter of the second photocatalyst is greater than or equal to 13 nm and less than or equal to 20 nm. One end of the pipeline assembly is detachably connected to the first housing unit, and the other end is detachably connected to the second housing unit; the hollow cavity of the first housing unit and the hollow cavity of the second housing unit are communicated through the pipeline assembly. The processing state further comprises that the second light-emitting unit emits ultraviolet light toward the second photocatalyst; the ultraviolet light emitted by the second light-emitting unit reacts with the substances generated by the second photocatalyst to be located in the space surrounded by the second housing unit; and the sewage flows through the hollow cavities of the first housing unit, the second housing unit, and the third treatment assembly in sequence. The wavelength of the ultraviolet light emitted by the second light-emitting unit is greater than or equal to 240 nm and less than or equal to 260 nm.

7. The hierarchical sewage treatment device according to claim 5, wherein the second support unit comprises a third support part and a fourth support part; the third support part and the fourth support part are detachably connected to the first housing unit; the third support part and the fourth support part are arranged in the hollow cavity surrounded by the first housing unit; the third support part and the fourth support part are arranged at intervals; the third support part is sleeved on the outer circumferential side of the fourth support part; the second photocatalyst is coated on the outer surface of the third support part; and the second photocatalyst is coated on the outer surface of the fourth support part.

6. A stepped sewage treatment apparatus according to claim 5, wherein The outer circumferential surface of the third support part and the space surrounded by the first housing unit form a fourth region; the inner circumferential wall of the third support part and the outer circumferential wall of the fourth support part surround a fifth region; the space surrounded by the fourth support part forms a sixth region; the fourth region and the fifth region are communicated through the third support part; and the fifth region and the sixth region are communicated through the fourth support part. The processing state further comprises that the sewage flows through the hollow cavities of the first housing unit, the sixth region, the fifth region, the fourth region, and the hollow cavity of the third treatment assembly in sequence.

8. The hierarchical sewage treatment device according to claim 1, wherein ​ ​ ​ The third processing assembly comprises a third shell unit, a third support unit, a third light emitting unit and a third photocatalyst; the third support unit and the third light emitting unit are detachably connected with the third shell unit; the third support unit and the third light emitting unit are arranged in the hollow cavity of the third shell unit; the third photocatalyst is in the form of particles; the third photocatalyst is detachably connected with the outer surface of the third support unit; the diameter of the third photocatalyst is greater than or equal to 8 nm and less than 13 nm; one end of the pipeline assembly is detachably connected with the second processing assembly, and the other end is detachably connected with the third shell unit; the hollow cavity of the second processing assembly and the hollow cavity of the third shell unit are communicated through the pipeline assembly; The processing state further comprises that the third light emitting unit emits ultraviolet light towards the third photocatalyst; the substance generated by the reaction between the ultraviolet light emitted by the third light emitting unit and the third photocatalyst is located in the space surrounded by the third shell unit; the sewage flows through the hollow cavities of the first shell unit, the second processing assembly and the third shell unit in sequence.

9. The hierarchical sewage treatment device according to claim 8, characterized in that, The wavelength of the ultraviolet light emitted by the third light emitting unit is greater than or equal to 200 nm and less than or equal to 230 nm.

10. The hierarchical sewage treatment device according to claim 8, characterized in that, The third support unit comprises a fifth support part and a sixth support part; the fifth support part and the sixth support part are detachably connected with the third shell unit; the fifth support part and the sixth support part are arranged in the hollow cavity surrounded by the third shell unit; the fifth support part and the sixth support part are arranged at intervals; the fifth support part is sleeved on the outer circumferential side of the sixth support part; the third photocatalyst is coated on the outer surface of the fifth support part; the third photocatalyst is coated on the outer surface of the sixth support part; The space surrounded by the outer circumferential surface of the fifth support part and the third shell unit is a seventh region; the space surrounded by the inner circumferential wall of the fifth support part and the outer circumferential wall of the sixth support part is an eighth region; the space surrounded by the sixth support part is a ninth region; the seventh region and the eighth region are communicated through the fifth support part; the eighth region and the ninth region are communicated through the sixth support part; The processing state further comprises that the sewage flows through the hollow cavities of the first shell unit, the second processing assembly, the ninth region, the eighth region and the seventh region in sequence.

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